US20030156966A1 - 0301 Steel for making pipe molds - Google Patents
0301 Steel for making pipe molds Download PDFInfo
- Publication number
- US20030156966A1 US20030156966A1 US10/315,873 US31587302A US2003156966A1 US 20030156966 A1 US20030156966 A1 US 20030156966A1 US 31587302 A US31587302 A US 31587302A US 2003156966 A1 US2003156966 A1 US 2003156966A1
- Authority
- US
- United States
- Prior art keywords
- steel
- vanadium
- manganese
- maximum
- silicon
- 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.)
- Abandoned
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 38
- 239000010959 steel Substances 0.000 title claims abstract description 38
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 17
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 16
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 15
- 239000010703 silicon Substances 0.000 claims abstract description 15
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 12
- 239000011733 molybdenum Substances 0.000 claims abstract description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 11
- 239000011651 chromium Substances 0.000 claims abstract description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 239000011574 phosphorus Substances 0.000 claims abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- 239000011593 sulfur Substances 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 6
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract 5
- 238000005266 casting Methods 0.000 claims description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 14
- 229910052748 manganese Inorganic materials 0.000 description 14
- 239000011572 manganese Substances 0.000 description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 238000005275 alloying Methods 0.000 description 3
- 230000014509 gene expression Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000002301 combined effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
- B22D13/101—Moulds
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Definitions
- the present invention relates to a ferritic alloy steel used for making pipe molds.
- low alloy steels like AISI 4130 (1% chromium, 0.20% molybdenum) and 21CrMo10 (2.25% chromium, 0.35% molybdenum) are considered the workhorse grades for pipe mold steel.
- AISI 4130 chemistry is provided from Aerospace Structural Metals Handbook, (1986), pp 1-20.
- 21CrMo10 chemistry is provided from Stahl gleichel (Key to Steel) (1977), pp 192-207.
- the present invention relates to a ferritic alloy steel with high hardenability, high toughness, and high ductility for making pipe molds used for centrifugally casting pipe.
- the steel of the present invention may preferably be used to make pipe molds or other products undergoing high thermal stresses.
- Another object of the invention is to provide a steel for producing pipe molds with improved service life for centrifugally casting pipe.
- a further object of the invention is to provide a steel for producing pipe molds with improved service life for centrifugally casting pipe, with the pipe mold steel having a reduced carbon level and vanadium, manganese and silicon.
- Another object of the invention is to produce a steel of substantially high hardenability with the addition of manganese and silicon to the alloy system.
- the present invention is directed to a low alloy ferritic steel for making pipe molds with improved service life that are used for centrifugally casting pipe.
- Pipe molds made from this steel can be used to centrifugally cast both small and large diameter pipe.
- the steel preferably may be used to make pipe molds or other products undergoing high thermal stresses.
- the present invention relates to a steel with high hardenability, high toughness, and high ductility. This invention creates an alloy that is a modification of the 21CrMo10 base alloy system.
- the alloying elements manganese and silicon, together with phosphorus, sulfur, chromium, molybdenum, nickel, and vanadium, provide desirable properties for long service life of pipe molds made with this steel.
- the combined effect of the use of manganese and silicon within the specified ranges, coupled with the other elements, promotes the enhancement of properties in the low chromium steel.
- the weight percentages of the steel of the present invention which has been designated “0301” (Khare IV), are set forth in Table 2, below: TABLE 2 Element 0301 (Khare IV) Carbon 0.16-0.22 Manganese 0.60-0.90 Silicon 0.50-0.65 Phosphorus 0.015 Maximum Sulfur 0.015 Maximum Chromium 2.25-2.55 Molybdenum 0.40-0.50 Nickel 0.55-0.65 Vanadium 0.03-0.08 Iron Balance
- the carbon level of the steel chemistry of the present invention is lower than in the conventional AISI 4130 range of 0.28-0.33%.
- the reduced carbon results in a reduction in hardness and strength coupled with an increase in toughness and ductility in the as-heat treated pipe mold.
- the reduced carbon also helps reduce the internal stresses of the steel of the present invention. This will mean that there is greater stability after tempering in the pipe molds made from the steel of the present invention. As such, the pipe molds will be less susceptible to quench cracking during the manufacture or due to thermal fatigue, and distortion during production. These combined effects greatly improve the service life.
- Vanadium in the range of 0.03-0.08% is added to the steel of the present invention to give the steel fine austenitic grain size and prevent softening during temper. Vanadium was not included in the AISI 4130 grade of steel. The fine grain size working in conjunction with the low stresses resulting from the use of reduced carbon enhances the stability of the steel of the present invention. Vanadium, along with the alloying elements manganese and molybdenum, help maintain the desired level of post-temper hardness.
- Manganese in the 0.60-0.90% range provides a high carbon/manganese ratio. Manganese promotes deep hardening at the desired levels without adversely affecting the desired properties of toughness and ductility. Additionally, manganese raises the strength without sacrificing weldability.
- Silicon in the 0.50-0.65% range provides Solid Solution strengthening and improves high temperature oxidation resistance. Silicon will counterbalance adverse temper embrittlement effects that may be caused by higher levels of manganese.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A low alloy steel, designated 0301 (Khare IV) steel, that may be used for making pipe molds with high hardenability, high ductility and high toughness are described, the steel consisting essentially of from about 0.16% to about 0.22% carbon, about 0.60% to about 0.90% manganese, about 0.50% to about 0.65% silicon, about 0.015% maximum phosphorus, about 0.015% maximum sulfur, about 2.25% to about 2.55% chromium, about 0.40% to about 0.50% molybdenum, about 0.55% to about 0.65% nickel, about 0.03% to about 0.08% vanadium, and balance essentially iron.
Description
- The present invention relates to a ferritic alloy steel used for making pipe molds.
- Traditionally, low alloy steels like AISI 4130 (1% chromium, 0.20% molybdenum) and 21CrMo10 (2.25% chromium, 0.35% molybdenum) are considered the workhorse grades for pipe mold steel. The chemistry of these two grades, listed as weight percentages, is provided in Table 1, below. AISI 4130 chemistry is provided from Aerospace Structural Metals Handbook, (1986), pp 1-20. 21CrMo10 chemistry is provided from Stahlschlussel (Key to Steel) (1977), pp 192-207. These low alloy steels have been used quite successfully over the years. However, the restrictions on the minimum amounts of certain elements have limited the specific minimum hardenability, as well as the mechanical properties of tensile and impact that can be achieved from either of these grades.
TABLE 1 Element AISI 4130 21CrMo10 Carbon 0.28-0.33 0.16-0.23 Manganese 0.40-0.60 0.20-0.40 Silicon 0.20-0.35 0.20-0.40 Phosphorus 0.025 Maximum 0.025 Maximum Sulfur 0.025 Maximum 0.025 Maximum Chromium 0.80-1.10 2.30-2.60 Molybdenum 0.15-0.25 0.30-0.40 Nickel 0.25 Maximum — Copper 0.35 maximum — Iron Balance Balance - Conventional thinking has been that pipe mold service life is primarily dependent on the properties of hardness and strength of the as-heat treated pipe mold. The main element in ferritic alloy steels that imparts hardness and strength to pipe mold steels is carbon. Therefore, it has been thought that to create pipe molds with long service lives there had to be high levels of carbon in the steel. Consistent with this thinking, the AISI 4130 grade had high carbon levels in the range of 0.28-0.33%.
- Modifications to the AISI 4130 grade chemistry have been previously made in assignee's U.S. Pat. No. 4,992,239. There also have been improvements to the 21CrMo10 grade chemistry by the addition of vanadium.
- There remains the need to produce pipe molds with properties that enhance the hardenability, while maintaining the strength, ductility and toughness under many types of working conditions. Additionally, this high hardenability and high strength can not be achieved at the expense of weldability in this steel.
- The present invention relates to a ferritic alloy steel with high hardenability, high toughness, and high ductility for making pipe molds used for centrifugally casting pipe. The steel of the present invention may preferably be used to make pipe molds or other products undergoing high thermal stresses. Another object of the invention is to provide a steel for producing pipe molds with improved service life for centrifugally casting pipe. A further object of the invention is to provide a steel for producing pipe molds with improved service life for centrifugally casting pipe, with the pipe mold steel having a reduced carbon level and vanadium, manganese and silicon. Another object of the invention is to produce a steel of substantially high hardenability with the addition of manganese and silicon to the alloy system.
- These and other objects of the invention will be described in detail in the remainder of the specification.
- The present invention is directed to a low alloy ferritic steel for making pipe molds with improved service life that are used for centrifugally casting pipe. Pipe molds made from this steel can be used to centrifugally cast both small and large diameter pipe. The steel preferably may be used to make pipe molds or other products undergoing high thermal stresses. The present invention relates to a steel with high hardenability, high toughness, and high ductility. This invention creates an alloy that is a modification of the 21CrMo10 base alloy system.
- The alloying elements manganese and silicon, together with phosphorus, sulfur, chromium, molybdenum, nickel, and vanadium, provide desirable properties for long service life of pipe molds made with this steel. The combined effect of the use of manganese and silicon within the specified ranges, coupled with the other elements, promotes the enhancement of properties in the low chromium steel. The weight percentages of the steel of the present invention, which has been designated “0301” (Khare IV), are set forth in Table 2, below:
TABLE 2 Element 0301 (Khare IV) Carbon 0.16-0.22 Manganese 0.60-0.90 Silicon 0.50-0.65 Phosphorus 0.015 Maximum Sulfur 0.015 Maximum Chromium 2.25-2.55 Molybdenum 0.40-0.50 Nickel 0.55-0.65 Vanadium 0.03-0.08 Iron Balance - The typical melt chemistry aims in weight percentages of the various elements is set forth in Table 3 below:
TABLE 3 Element 0301 (Khare IV) Carbon 0.18 Manganese 0.75 Silicon 0.56 Phosphorus as low as possible, 0.005 Maximum Sulfur as low as possible, 0.005 Maximum Chromium 2.40 Molybdenum 0.45 Nickel 0.50 Vanadium 0.05 Iron Balance - Moreover, the alloying of the steel with manganese and silicon in the ranges specified promotes the desired toughness, hardenability, and ductility in the as-heat treated pipe molds. Pipe molds of a size ranging from 4 in. to 36 in. were prepared, heat treated, and tested for mechanical properties using the 0301 steel. The mechanical properties of the 0301 steel are set forth in Table 4, below.
TABLE 4 Tensile .2% Yield C—V—N Impacts Size (psi) (psi) % El % RA (Foot Pounds, avg. of 3) 4 In. 119,000 107,000 23 75 154 6 In. 122,000 108,000 23 71 152 8 In. 123,000 111,000 23 74 147 8 In. 123,000 110,000 22 73 153 8 In. 121,000 108,000 23 72 150 12 In. 128,000 116,000 20 71 142 20 In. 133,000 120,000 23 73 130 20 In. 133,000 119,000 22 74 129 24 In. 127,000 114,000 21 69 109 30 In. 126,000 113,000 21 66 115 36 In. 124,000 111,000 23 69 138 - The carbon level of the steel chemistry of the present invention is lower than in the conventional AISI 4130 range of 0.28-0.33%. Important here, the reduced carbon results in a reduction in hardness and strength coupled with an increase in toughness and ductility in the as-heat treated pipe mold. The reduced carbon also helps reduce the internal stresses of the steel of the present invention. This will mean that there is greater stability after tempering in the pipe molds made from the steel of the present invention. As such, the pipe molds will be less susceptible to quench cracking during the manufacture or due to thermal fatigue, and distortion during production. These combined effects greatly improve the service life.
- Vanadium in the range of 0.03-0.08% is added to the steel of the present invention to give the steel fine austenitic grain size and prevent softening during temper. Vanadium was not included in the AISI 4130 grade of steel. The fine grain size working in conjunction with the low stresses resulting from the use of reduced carbon enhances the stability of the steel of the present invention. Vanadium, along with the alloying elements manganese and molybdenum, help maintain the desired level of post-temper hardness.
- Manganese in the 0.60-0.90% range provides a high carbon/manganese ratio. Manganese promotes deep hardening at the desired levels without adversely affecting the desired properties of toughness and ductility. Additionally, manganese raises the strength without sacrificing weldability.
- Silicon in the 0.50-0.65% range provides Solid Solution strengthening and improves high temperature oxidation resistance. Silicon will counterbalance adverse temper embrittlement effects that may be caused by higher levels of manganese.
- The terms and expressions that are used herein are terms of expression and not of limitation. And there is no intention in the use of such terms and expressions of excluding the equivalents of the features shown and described, or portions thereon, it being recognized that various modifications are possible in the scope of the present invention.
Claims (7)
1. A ferritic alloy steel in weight percentage consisting essentially of from about 0.16-0.22% carbon, 0.60-0.90% manganese, 0.50-0.65% silicon, 0.015% maximum phosphorus, 0.015% maximum sulfur, 2.25-2.55% chromium, 0.40-0.50% molybdenum, 0.55-0.65% nickel, 0.03-0.08% vanadium, and balance essentially iron.
2. The steel recited in claim 1 , consisting essentially of from about 0.18% carbon, 0.75% manganese, 0.56% silicon, 0.005% maximum phosphorus, 0.005% maximum sulfur, 2.40% chromium, 0.45% molybdenum, 0.50% nickel, 0.05% vanadium, and balance essentially iron.
3. A pipe mold steel for centrifugally casting pipe formed from a ferritic alloy steel in weight percentage in weight percentage consisting essentially of from about 0.16-0.22% carbon, 0.60-0.90% manganese, 0.50-0.65% silicon, 0.015% maximum phosphorus, 0.015% maximum sulfur, 2.25-2.55% chromium, 0.40-0.50% molybdenum, 0.55-0.65% nickel, 0.03-0.08% vanadium, and balance essentially iron.
4. The pipe mold steel recited in claim 3 , consisting essentially of from about 0.18% carbon, 0.75% manganese, 0.56% silicon, 0.005% maximum phosphorus, 0.005% maximum sulfur, 2.40% chromium, 0.45% molybdenum, 0.50% nickel, 0.05% vanadium, and balance essentially iron.
5. A pipe mold steel for centrifugally casting pipe formed from a ferritic alloy steel comprising vanadium.
6. The pipe mold steel recited in claim 5 , comprising vanadium in a weight percentage of from about 0.03-0.08%.
7. The pipe mold steel recited in claim 6 , comprising vanadium in a weight percentage of from about 0.05%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/315,873 US20030156966A1 (en) | 2001-12-10 | 2002-12-10 | 0301 Steel for making pipe molds |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US33997701P | 2001-12-10 | 2001-12-10 | |
| US34070001P | 2001-12-13 | 2001-12-13 | |
| US10/315,873 US20030156966A1 (en) | 2001-12-10 | 2002-12-10 | 0301 Steel for making pipe molds |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20030156966A1 true US20030156966A1 (en) | 2003-08-21 |
Family
ID=26991910
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10/315,875 Abandoned US20030147768A1 (en) | 2001-12-10 | 2002-12-10 | 0303 Steel for making pipe molds |
| US10/315,873 Abandoned US20030156966A1 (en) | 2001-12-10 | 2002-12-10 | 0301 Steel for making pipe molds |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10/315,875 Abandoned US20030147768A1 (en) | 2001-12-10 | 2002-12-10 | 0303 Steel for making pipe molds |
Country Status (3)
| Country | Link |
|---|---|
| US (2) | US20030147768A1 (en) |
| AU (2) | AU2002362119A1 (en) |
| WO (2) | WO2003050318A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100453683C (en) * | 2006-02-24 | 2009-01-21 | 南阳二机石油装备(集团)有限公司 | A kind of low-temperature high-strength, high-toughness steel and its manufacturing method |
| TWI798338B (en) * | 2018-06-26 | 2023-04-11 | 美商Ａ芬克父子公司 | Plastic injection mold tooling and a method of manufacture thereof |
| CN110438412A (en) * | 2019-07-24 | 2019-11-12 | 山西建龙实业有限公司 | A kind of HRB400E anti-seismic steel bar and its production technology reducing cost of alloy |
| CN112080621B (en) * | 2020-08-27 | 2022-07-22 | 通裕重工股份有限公司 | Pipe die material and post-forging heat treatment method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4472208A (en) * | 1982-06-28 | 1984-09-18 | Sumitomo Metal Industries, Ltd. | Hot-rolled high tensile titanium steel plates and production thereof |
| US5766376A (en) * | 1994-11-04 | 1998-06-16 | Nippon Steel Corporation | High-strength ferritic heat-resistant steel and method of producing the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4919735A (en) * | 1988-12-29 | 1990-04-24 | National Forge Company | Khare pipe mold steel |
| US5330707A (en) * | 1993-06-25 | 1994-07-19 | National Forge Company | Steel for making very large pipe molds |
| JP4369545B2 (en) * | 1998-11-30 | 2009-11-25 | 新日本製鐵株式会社 | Ferritic sheet steel with excellent strain rate dependency and automobile using the same |
-
2002
- 2002-12-10 AU AU2002362119A patent/AU2002362119A1/en not_active Abandoned
- 2002-12-10 US US10/315,875 patent/US20030147768A1/en not_active Abandoned
- 2002-12-10 WO PCT/US2002/039333 patent/WO2003050318A1/en not_active Ceased
- 2002-12-10 WO PCT/US2002/039385 patent/WO2003050319A1/en not_active Ceased
- 2002-12-10 AU AU2002357799A patent/AU2002357799A1/en not_active Abandoned
- 2002-12-10 US US10/315,873 patent/US20030156966A1/en not_active Abandoned
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4472208A (en) * | 1982-06-28 | 1984-09-18 | Sumitomo Metal Industries, Ltd. | Hot-rolled high tensile titanium steel plates and production thereof |
| US5766376A (en) * | 1994-11-04 | 1998-06-16 | Nippon Steel Corporation | High-strength ferritic heat-resistant steel and method of producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2002362119A1 (en) | 2003-06-23 |
| WO2003050318A1 (en) | 2003-06-19 |
| US20030147768A1 (en) | 2003-08-07 |
| WO2003050319A1 (en) | 2003-06-19 |
| AU2002357799A1 (en) | 2003-06-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: NATIONAL FORGE COMPANY, PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KHARE, ASHOK K.;REEL/FRAME:013826/0770 Effective date: 20030220 |
|
| STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |