US2553865A - Case hardening composition - Google Patents
Case hardening composition Download PDFInfo
- Publication number
- US2553865A US2553865A US149203A US14920350A US2553865A US 2553865 A US2553865 A US 2553865A US 149203 A US149203 A US 149203A US 14920350 A US14920350 A US 14920350A US 2553865 A US2553865 A US 2553865A
- Authority
- US
- United States
- Prior art keywords
- sodium
- bath
- parts
- case hardening
- cyanide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000203 mixture Substances 0.000 title claims description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 30
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 25
- 239000004615 ingredient Substances 0.000 claims description 12
- -1 STEEL Inorganic materials 0.000 claims description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 36
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 36
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 22
- 229910052799 carbon Inorganic materials 0.000 description 22
- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 description 19
- 229910000029 sodium carbonate Inorganic materials 0.000 description 18
- 239000011780 sodium chloride Substances 0.000 description 18
- 239000010959 steel Substances 0.000 description 17
- 229910000851 Alloy steel Inorganic materials 0.000 description 12
- 150000003839 salts Chemical class 0.000 description 12
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 10
- 229910052783 alkali metal Inorganic materials 0.000 description 10
- 150000001340 alkali metals Chemical class 0.000 description 10
- ZVCDLGYNFYZZOK-UHFFFAOYSA-M sodium cyanate Chemical compound [Na]OC#N ZVCDLGYNFYZZOK-UHFFFAOYSA-M 0.000 description 9
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 8
- 229910052708 sodium Inorganic materials 0.000 description 8
- 239000011734 sodium Substances 0.000 description 8
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical class N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 5
- 229910000831 Steel Chemical group 0.000 description 5
- 238000007792 addition Methods 0.000 description 5
- 239000001103 potassium chloride Substances 0.000 description 5
- 235000011164 potassium chloride Nutrition 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000005255 carburizing Methods 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 229910052788 barium Inorganic materials 0.000 description 3
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical class [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 238000010306 acid treatment Methods 0.000 description 2
- 239000012190 activator Substances 0.000 description 2
- 150000001553 barium compounds Chemical class 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 150000003841 chloride salts Chemical class 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical class [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- XLJMAIOERFSOGZ-UHFFFAOYSA-M cyanate Chemical class [O-]C#N XLJMAIOERFSOGZ-UHFFFAOYSA-M 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- JMANVNJQNLATNU-UHFFFAOYSA-N glycolonitrile Natural products N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- HCQWRNRRURULEY-UHFFFAOYSA-L lithium;potassium;dichloride Chemical compound [Li+].[Cl-].[Cl-].[K+] HCQWRNRRURULEY-UHFFFAOYSA-L 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/42—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/44—Carburising
- C23C8/46—Carburising of ferrous surfaces
Definitions
- This invention relates to a fusible salt bath for the treatment of iron or steel or ferrous alloys by a process generally known as carbur-izing. cementation or case hardening. More particularly the invention relates to a novel composition and method for a case hardening treatment.
- Case hardening baths have long been known and used to give a surface hardness to iron and steel parts by the introduction of carbon and nitrogen into the surface of the metal.
- Such baths are usually composed of a cyanogen compound with or without an activating material to accelerate or control the rate of case hardening.
- diluents as Cementation with carbon and nitrogen will occur slowly when mixtures of sodium and potassium canides are used.
- activators as the alkaline earth metals especially calcium and barium in the form of chlorides and carbonates the rate of cementation is markedly increased and a higher proportion of carbon is introduced into the metal.
- each of case hardening compound consists essentially of the sodium salts of cyanide, cyanate, chloride and carbonate the bath is unstable and requires frequent and large additions of cyanides. This bath is unreliable and does not give uniform depths of case.
- Calcium compounds such as calcium oxide and calcium chloride are frequently used as energizers or activators for cyanide baths, and while controlled cementation is accomplished, the bath is hygroscopic and corrosive to the work and furnace parts.
- the work is often coated with lime salts and acid treatment is required to clean the work.
- Barium compounds are also successfully used to regulate the carburizing action of salt baths but are characterized by the great diificulty encountered in cleaning the work after cement-ation. As with the calcium salts, the compounds of barium are difiicultly soluble in water, and alkali cleaners and acid treatment is frequently necessary to clean the metal parts.
- a cyanide containing salt bath composition can be activated or energized by the addition of an alkali metal fluosilicat'e also known as silico fluoride.
- the resulting bath is not open to the objections cited, and in addition has the following advantages: it is completely water soluble, and treated parts when quenched in water have a clean bright finish.
- the carburizing action is rapid and case depths are obtained which are equivalent to those found when using barium and strontium activated L-bath's.
- the baths containing fluosilicates are very stable and little or no fuming or foaming is noted at operating temperatures.
- An added advantage is the low cost of the accelerator especially when compared to strontium and barium compounds.
- the amount of fiuosilicate salt necessary to produce effective activation of a carburizing bath is low, and as small an amount as 2% is sufficient in some cases. Satisfactory energizing is also obtained when as much as 20% is used, but the bath becomes somewhat viscous and tends to sludge when as much as this is used.
- the preferred compositions contain from 4 to 12% of the fluosilicate salt.
- Example 1 Iron wire having a diameter of 0.125 inch and a carbon content 0.10 percent was treated at 1600 F. in a fused salt bath of the following composition;
- Example 2 A steel rod having a carbon content of 0.012
- Example 3 A case hardening bath was prepared by blending together the following materials in powder form.
- Sodium cyanide 40 Sodium chloride 39 Sodium carbonate 12 Sodium fluosilicate 8 Carbon l 1 Steel rods, carbon 0.20%, manganese 0.40%, phosphorus 0.04%, sulfur 0.04%, were treated in this bath and cyanide and case depths determina tions made.
- Example 4 A steel bolt having a carbon content of 015 percent was treated in a fused salt bath of the following composition:
- Carbon 2 The temperature was maintained at 1700 F. and after hr. immersion the case depth was found to be 0.011 inch.
- Example 5 A salt bath of the following composition was fused and maintained at a temperature of 1550 F.:
- the level of the bath in the pot was maintained by the regular addition of the following mixture,
- composition of matter for a case hardenin bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
- composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
- a composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
- a composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
- a composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the followin ingredients:
- a composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
- a composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
- a composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
- a composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients;
- a composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
chlorides and carbonates.
Patented May 22, 1951 2,553,855 CASE HARDENING 66 IsaacLaird-Newll, Wethersfield, Conn.
N0 Drawing. Application March 11, 1950, Serial No. 149,203
" 11 Claims.
This invention relates to a fusible salt bath for the treatment of iron or steel or ferrous alloys by a process generally known as carbur-izing. cementation or case hardening. More particularly the invention relates to a novel composition and method for a case hardening treatment.
Case hardening baths have long been known and used to give a surface hardness to iron and steel parts by the introduction of carbon and nitrogen into the surface of the metal. Such baths are usually composed of a cyanogen compound with or without an activating material to accelerate or control the rate of case hardening. There is also generally present such diluents as Cementation with carbon and nitrogen will occur slowly when mixtures of sodium and potassium canides are used. By the addition of such activators as the alkaline earth metals especially calcium and barium in the form of chlorides and carbonates the rate of cementation is markedly increased and a higher proportion of carbon is introduced into the metal. There are objectionable features to each of case hardening compound consists essentially of the sodium salts of cyanide, cyanate, chloride and carbonate the bath is unstable and requires frequent and large additions of cyanides. This bath is unreliable and does not give uniform depths of case.
Calcium compounds such as calcium oxide and calcium chloride are frequently used as energizers or activators for cyanide baths, and while controlled cementation is accomplished, the bath is hygroscopic and corrosive to the work and furnace parts. The work is often coated with lime salts and acid treatment is required to clean the work.
Barium compounds are also successfully used to regulate the carburizing action of salt baths but are characterized by the great diificulty encountered in cleaning the work after cement-ation. As with the calcium salts, the compounds of barium are difiicultly soluble in water, and alkali cleaners and acid treatment is frequently necessary to clean the metal parts.
Other energizers such as fluorides are also used, but their effect is slight and results are often erratic.
I have found that a cyanide containing salt bath composition can be activated or energized by the addition of an alkali metal fluosilicat'e also known as silico fluoride. The resulting bath is not open to the objections cited, and in addition has the following advantages: it is completely water soluble, and treated parts when quenched in water have a clean bright finish. The carburizing action is rapid and case depths are obtained which are equivalent to those found when using barium and strontium activated L-bath's.
The baths containing fluosilicates are very stable and little or no fuming or foaming is noted at operating temperatures. An added advantage is the low cost of the accelerator especially when compared to strontium and barium compounds.
The amount of fiuosilicate salt necessary to produce effective activation of a carburizing bath is low, and as small an amount as 2% is sufficient in some cases. Satisfactory energizing is also obtained when as much as 20% is used, but the bath becomes somewhat viscous and tends to sludge when as much as this is used. The preferred compositions contain from 4 to 12% of the fluosilicate salt.
The following examples will serve to further illustrate the invention:
Example 1 Iron wire having a diameter of 0.125 inch and a carbon content 0.10 percent was treated at 1600 F. in a fused salt bath of the following composition;
Parts by weight Sodium cyanide 20 Sodium chloride 44 Sodium carbonate 34 Sodium fluosilicate 2 After an immersion time of one hour the depth of case was .012 inch and the surface was bright and file hard. The salt bath gave no evidence of sludge formation and fuming was slight.
Example 2 A steel rod having a carbon content of 0.012
percent was immersed in a fused salt bath of the following composition:
Parts by weight Sodium cyanide 20 Sodium chloride 43 Sodium carbonate 30.99 Potassium fiuosilicate 6 Carbon .01
After an immersion time of one hour during which period the temperature :of the bath was maintained at 1650 F., the depth of case was found to be 0.014 inch. The surface was bright and clean and file hard. No sludging, frothing or foaming was noted.
Example 3 A case hardening bath was prepared by blending together the following materials in powder form.
Parts by Weight Sodium cyanide 20 Sodium chloride 3'9 Sodium carbonate 32 Sodium fiuosilicate 8 Carbon 1 The mixture was fused and maintained at a temperature of 1600 F. In order to maintain the bath level from loss due to dragout on the work and maintain activity which might have been lessened due to surface decomposition, a replenisher was added regularly at the rate of 10 percent by weight of the bath per 8 hour day, the replenisher having the following proportions:
Parts by weight Sodium cyanide 40 Sodium chloride 39 Sodium carbonate 12 Sodium fluosilicate 8 Carbon l 1 Steel rods, carbon 0.20%, manganese 0.40%, phosphorus 0.04%, sulfur 0.04%, were treated in this bath and cyanide and case depths determina tions made.
Cyanide Concentration in Bath (Percent Sodium Cyanide) Days in Operation Microscopic examinations for case depths showed the following average figures:
Depth of case Inches hr .010 1 hr .015 2 hrs .022
3 hrs .027 4 hrs .030
Example 4 A steel bolt having a carbon content of 015 percent was treated in a fused salt bath of the following composition:
Parts by weight Sodium cyanide 40 Sodium cyanate 2 Sodium chloride 30 Sodium carbonate 9 Potassium chloride Lithium fiuosilicate; 12
Carbon 2 The temperature was maintained at 1700 F. and after hr. immersion the case depth was found to be 0.011 inch.
Example 5 A salt bath of the following composition was fused and maintained at a temperature of 1550 F.:
Parts by weight Sodium cyanide Sodium cyanate 5 Sodium carbonate 25 Sodium chloride 34.5 Sodium fluosilicate 20 Carbon 0.5
The level of the bath in the pot was maintained by the regular addition of the following mixture,
making the addition at the rate of percent per hour.
Parts by weight Sodium cyanide '75 Sodium cyanate 4 Sodium carbonate .5 Sodium fiuosilicate 15 Carbon 0.5
Steel rods having a carbon content of 0.15 percent were immersed in this bath for 2 hours. A
- depth of case of 0.020 inch was produced.
Starting Replen- Salt isher Parts by Paris by weight weight Sodium Cyanide l. 70-40 4075 Sodium Oyanate l 0-5 0-5 Sodium Chloride" 5-45 5-40 Sod um Carbonate. 5-35 5-20 Potassium Chloride.. 0-30 0-30 Alkali Metal Fluosilicate. 2-20 220 Carbon 0-2 0-2 The higher the operating temperature, the faster the rate of cementation. Temperatures as high as 1900 F. have been used without excessive frothing or foaming of the bath. And ternperatures as low as 1400 F. have been employed with effective carburizingl What is claimed is:
l. A composition of matter for a case hardenin bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
Parts by weight Sodium cyanide 10 to 40 Sodium chloride 5 to 45 Sodium carbonate 5 to 35 Alkali metal fiuosilicate 2 to 20 2. A composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
Parts by weight Sodium cyanide 10 to 40 Sodium cyanate less than 5 Sodium chloride 5 to 45 Sodium carbonate 5 to 35 Alkali metal fluosilicate 2 to 20 3. A composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
Parts by weight Sodium cyanide 10 to 40 Sodium cyanate less than 5 Sodium chloride 5 to 45 Sodium carbonate 5 to 35 Potassium chloride less than 30 Alkali metal fluosilicate 2 to 20 4. A composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
Parts by weight Sodium cyanide to 40 Sodium chloride 5 to 45 Sodium carbonate 5 to 35 Potassium chloride less than 30 Alkali metal fluosilicate 2 to 5. A composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the followin ingredients:
Parts by weight Sodium cyanide 10 to 40 Sodium chloride 5 to 45 Sodium carbonate 5 to 35 Potassium chloride less than Carbon less than 2 Alkali metal fiuosilicate 2 to 20 6. A composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
Parts by weight Sodium cyanide 10 to 40 Sodium cyanate less than 5 Sodium chloride 5 to 45 Sodium carbonate 5 to Carbon less than 2 Alkali metal fiuosilicate 2 to 20 '7. A composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
Parts by Weight Sodium cyanide 10 to 40 Sodium chloride 5 to Sodium carbonate 5 to 35 Carbon less than 2 Alkali metal fiuosilicate 2 to 20 8. A composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the followin ingredients:
Parts by weight Sodium cyanide 10 to 40 Sodium cyanate less than 5 Sodium chloride 5 to 45 Sodium carbonate 5 to 35 Carbon less than 2 Sodium fiuosilicate 2 to 20 9. A composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
Parts by weight Sodium cyanide 10 to 40 Sodium cyanate less than 5 Sodium chloride 5 to 45 Sodium carbonate 5 to 35 Carbon less than 2 Potassium fiuosilicate 2 to 20 10. A composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients;
Parts by weight Sodium cyanide 10 to 40 Sodium cyanate less than 5 Sodium chloride 5 to 45 Sodium carbonate 5 to 35 Carbon less than 2 Lithium fiuosilicate 2 to 20 11. A composition of matter for a case hardening bath for iron, steel, and ferrous alloys consisting of a mixture of the following ingredients:
Parts by weight Sodium cyanide 10 to 40 Sodium cyanate Less than 5 Sodium chloride 5 to 45 Sodium carbonate 5 to 35 Potassium chloride Less than 30 Carbon Less than 2 Alkali metal fluosilicate 2 to 20 ISAAC LAIRD NEWELL.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,804,454 Beck May 12, 1931 OTHER REFERENCES Molten Salt Baths, page '7, published by Du Pont de Nemours & Co. Inc., 1946.
Claims (1)
1. A COMPOSITION OF MATTER FOR A CASE HARDENING BATH FOR IRON, STEEL, AND FERROUS ALLOYS CONSISTING OF A MIXTURE OF THE FOLLOWING INGREDIENTS:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US149203A US2553865A (en) | 1950-03-11 | 1950-03-11 | Case hardening composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US149203A US2553865A (en) | 1950-03-11 | 1950-03-11 | Case hardening composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2553865A true US2553865A (en) | 1951-05-22 |
Family
ID=22529215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US149203A Expired - Lifetime US2553865A (en) | 1950-03-11 | 1950-03-11 | Case hardening composition |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2553865A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3069296A (en) * | 1961-06-23 | 1962-12-18 | Bell Aerospace | Method for removal of iron nitride |
| US3912547A (en) * | 1972-02-18 | 1975-10-14 | Stephanois Rech Mec | Method of treatment of ferrous metal parts to increase their resistance to wear and seizure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1804454A (en) * | 1926-09-06 | 1931-05-12 | Degussa | Process for hardening articles made of iron or steel |
-
1950
- 1950-03-11 US US149203A patent/US2553865A/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1804454A (en) * | 1926-09-06 | 1931-05-12 | Degussa | Process for hardening articles made of iron or steel |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3069296A (en) * | 1961-06-23 | 1962-12-18 | Bell Aerospace | Method for removal of iron nitride |
| US3912547A (en) * | 1972-02-18 | 1975-10-14 | Stephanois Rech Mec | Method of treatment of ferrous metal parts to increase their resistance to wear and seizure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2553865A (en) | Case hardening composition | |
| JPS5855229B2 (en) | Surface conditioner for zinc phosphate treatment | |
| ES8606526A1 (en) | Process for improving the corrosion resistance of ferrous metal parts | |
| US1980152A (en) | Fused salt bath for carburizing iron, steel, and the like | |
| US1970852A (en) | Process and composition for treating metals | |
| US2364292A (en) | Casehardening | |
| US4591397A (en) | Non-cyanide salt bath and process for carburization of ferrous metals and alloys | |
| US2384835A (en) | Production of metallic magnesium | |
| US2927875A (en) | Process for carburizing and carboni-triding iron and steel | |
| EP0088526B1 (en) | Fused salt bath composition | |
| US2711981A (en) | Salt bath for heat treating steel | |
| US1796248A (en) | Process for the cementation of iron and steel | |
| US2007136A (en) | Process for carburizing and hardening | |
| US3649343A (en) | Chloride concentration control in immersion copper coating | |
| US3201286A (en) | Method of boronizing | |
| US2066454A (en) | Process for the thermal treatment of light metals and light metal alloys | |
| US2267413A (en) | Case hardening | |
| US2254296A (en) | Casehardening salt bath | |
| US3488233A (en) | Surface treatment of steels | |
| US2620310A (en) | Hardening bath | |
| US2046822A (en) | Composition for case hardening | |
| GB2054660A (en) | Fused salt baths containing lithium ions | |
| US2846344A (en) | Method of carburizing steel and steel alloys, and fused salt bath thereof | |
| US3922211A (en) | Method for improving abrasion resistance and for reducing friction of surfaces rubbing one against another in machinery | |
| US1789259A (en) | Case hardening method |