CN105200310A

CN105200310A - A kind of high plasticity corrosion-resistant pre-hardened plastic mold steel and preparation method thereof

Info

Publication number: CN105200310A
Application number: CN201510680982.8A
Authority: CN
Inventors: 张庆
Original assignee: Wuhu Valuable Skill Amusement Science And Technology Equipment Co ltd
Current assignee: Wuhu Valuable Skill Amusement Science And Technology Equipment Co ltd
Priority date: 2015-10-15
Filing date: 2015-10-15
Publication date: 2015-12-30

Abstract

The invention discloses a high-plasticity corrosion-resistant pre-hardened plastic die steel, which properly improves the proportion of elements such as Ni, Cr, Co, In and the like on the element proportion of the traditional pre-hardened plastic die steel, simultaneously controls the dosage of other alloy elements, further improves the mechanical property and the processing property of alloy materials on the basis of ensuring the mechanical property of the traditional plastic die steel, has good corrosion resistance and can meet the pouring requirement of various plastic parts, and the added rare earth oxide-graphene oxide coated nano tungsten carbide composite modifier refines the tissue structure of the die steel, improves the interface compatibility among crystals, has obvious reinforcing and toughening effects and uniform and stable modification effect; the die steel is wear-resistant and corrosion-resistant, has few surface defects, is durable, has simple and efficient preparation method and short manufacturing period, and has great production and application values.

Description

A kind of high-plasticity corrosion-resistance pre-hardened plastic mold steel and preparation method thereof

Technical field

The present invention relates to plastic die steel product technical field, particularly relate to a kind of high-plasticity corrosion-resistance pre-hardened plastic mold steel and preparation method thereof.

Background technology

Along with automobile, tractor, motor, wireless, the developing rapidly of household electrical appliance and national defense industry, cold stamping, extruding, die forging and die casting etc. are widely used without cutting technology, increasing to the requirement of mould, more and more higher requirement be it is also proposed to the thermal treatment quality etc. of the rolling shapes of mfg. moulding die, the metallurgical production of steel and steel.

The kind of current die steel mainly contains cold-work die steel, hot-work die steel, plastic die steel etc., ratio wherein shared by plastic die steel is maximum, the use properties of die steel is directly connected to the quality of the plastic prod processed, due to the characteristic of plastic prod, in erosion resistance, dimensional stability, surface abrasion resistance, polishability etc., all have higher requirement to plastic die steel, existing plastic die steel mainly exist hardness low, wear no resistance, work-ing life is low, many etc. the bandits of surface imperfection are to be solved problem.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, provides a kind of high-plasticity corrosion-resistance pre-hardened plastic mold steel and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of high-plasticity corrosion-resistance pre-hardened plastic mold steel, in this die steel, the weight percentage of each component is: C:0.3-0.4%, Mn:1.5-2.0%, Ni:2.0-3.0%, V:0.3-0.4%, Mo:0.3-0.4%, Cr:4.0-5.0%, In:0.4-0.5%, Co:0.3-0.4%, S :≤0.01%, P≤0.02%, compound modifier: 0.01-0.02%, and all the other are Fe and inevitable impurity.

Described a kind of high-plasticity corrosion-resistance pre-hardened plastic mold steel, described compound modifier is made up of the raw material of following weight part: oxide nano rare earth 2-3, nano titanium carbide 8-10, graphene oxide 1-1.5, dehydrated alcohol are appropriate, PEG-4000.1-0.2; Its preparation method is: be first dissolved in dehydrated alcohol by PEG-400, drop into oxide nano rare earth, graphene oxide subsequently, ultrasonic agitation process 40-50min, nano titanium carbide is added after it disperses completely, continue ultrasonic agitation mixing 1-2h, in 350-400 DEG C of baking oven, carry out drying treatment after stirring terminates, the abundant grinding distribution of powder after complete drying, obtain the compound modifier of rare earth oxide-graphene oxide compound coating nano titanium carbide.

The preparation method of described a kind of high-plasticity corrosion-resistance pre-hardened plastic mold steel, described preparation method is:

(1) drop in smelting furnace by each raw material except compound modifier according to element proportioning, after fusing, gained molten steel pours into steel ingot after refining and Fruit storage completely, and adds compound modifier with stream in casting process;

(2) steel ingot of gained is heated to 1080-1125 DEG C with the temperature rise rate of 80-100 DEG C/h in process furnace, after insulation 3-4h, steel ingot is forged, open forging temperature be 1050-1100 DEG C, stop forging temperature be 750-800 DEG C, gained module come out of the stove after naturally cooling for subsequent use;

(3) step (2) gained module is put into tempering stove, be heated to 450-500 DEG C with the speed of 60-80 DEG C/h, come out of the stove, through naturally cooling to room temperature and get final product after insulation 4-5h.

Advantage of the present invention is: the present invention suitably improves Ni in the element proportioning of traditional pre-hardened plastic mold steel, Cr, Co, the proportioning of the elements such as In, control the consumption of other alloying elements simultaneously, the basis ensureing conventional plastic die steel mechanical property further increases mechanical property and the processing characteristics of alloy material, its good erosion resistance can meet the cast of polytype plastic component and use, the rare earth oxide added-graphene oxide clad nano carbonization tungsten compound modifier refinement weave construction of die steel, improve the interface compatibility between crystal, activeness and quietness Be very effective, modification effect is uniform and stable, this die steel wear-and corrosion-resistant, few surface defects, durable in use, preparation method is simply efficient, and the manufacturing cycle is short, has production application and is worth.

Embodiment

In this embodiment die steel, the weight percentage of each component is: C:0.3%, Mn:1.5%, Ni:2.0%, V:0.3%, Mo:0.3%, Cr:4.0%, In:0.4%, Co:0.3%, S :≤0.01%, P≤0.02%, compound modifier: 0.01%, and all the other are Fe and inevitable impurity.

Wherein compound modifier is made up of the raw material of following weight part: oxide nano rare earth 2, nano titanium carbide 8, graphene oxide 1, dehydrated alcohol are appropriate, PEG-4000.1; Its preparation method is: be first dissolved in dehydrated alcohol by PEG-400, drop into oxide nano rare earth, graphene oxide subsequently, ultrasonic agitation process 40min, nano titanium carbide is added after it disperses completely, continue ultrasonic agitation mixing 1h, in 350 DEG C of baking ovens, carry out drying treatment after stirring terminates, the abundant grinding distribution of powder after complete drying, obtains the compound modifier of rare earth oxide graphene oxide compound coating nano titanium carbide.

The preparation method of this plastic die steel is:

(2) steel ingot of gained is heated to 1080 DEG C with the temperature rise rate of 80 DEG C/h in process furnace, insulation 3h after steel ingot is forged, open forging temperature be 1050 DEG C, stop forging temperature be 750 DEG C, gained module come out of the stove after naturally cooling for subsequent use;

(3) step (2) gained module is put into tempering stove, be heated to 450 DEG C with the speed of 60 DEG C/h, come out of the stove, through naturally cooling to room temperature and get final product after insulation 4h.

The mechanics properties testing result of the plastic die steel that the present embodiment prepares is as follows:

Test item	Measured value
		Hardness (HRC)	60.5
Tensile strength (MPa)	1558
		Impelling strength (J/cm ²)	153.6
Fracture toughness property (MPa.m ^1/2)	144.5

The plastic die steel that this embodiment prepares is compared than traditional P20 forging plastic die steel and is on average extended 2.8 times work-ing life, and its surface abrasion resistance is anti-corrosion, surface of polished roughness Ra < 0.10 μm.

Claims

1. A high-plasticity corrosion-resistant pre-hardened plastic mold steel is characterized in that, the percentage by weight of each component in the mold steel is: C:0.3-0.4%, Mn: 1.5-2.0%, Ni:2.0-3.0 %, V:0.3-0.4%, Mo:0.3-0.4%, Cr:4.0-5.0%, In:0.4-0.5%, Co:0.3-0.4%, S:≤0.01%, P≤0.02%, compound modification Additive: 0.01-0.02%, the rest is Fe and unavoidable impurities.

2. A kind of high plasticity corrosion-resistant pre-hardened plastic mold steel as claimed in claim 1, is characterized in that: described composite modificator is made of the following raw materials by weight: nano-rare earth oxide 2-3, nanometer Titanium carbide 8-10, graphene oxide 1-1.5, appropriate amount of ethanol, PEG-4000.1-0.2; the preparation method is: first dissolve PEG-400 in anhydrous ethanol, then add nano rare earth oxide, graphite oxide Ultrasonic stirring treatment for 40-50min, after it is completely dispersed, add nano-titanium carbide, continue ultrasonic stirring and mixing for 1-2h, after stirring, dry in an oven at 350-400°C, after complete drying, the powder is fully ground and dispersed, A composite modifier of rare earth oxide-graphene oxide composite coating nano-titanium carbide was obtained.

3. the preparation method of a kind of high plasticity corrosion-resistant pre-hardened plastic mold steel as claimed in claim 1, is characterized in that, described preparation method is:

(1) Put all raw materials except the composite modifier into the melting furnace according to the ratio of elements, and pour the molten steel obtained after complete melting into steel ingots after refining and vacuum degassing, and add the composite modifier along with the flow during the pouring process;

(2) Heat the obtained steel ingot in a heating furnace at a heating rate of 80-100°C/h to 1080-1125°C, hold the temperature for 3-4 hours and then forge the steel ingot, the forging start temperature is 1050-1100°C, and the forging stop temperature 750-800°C, the obtained modules are cooled naturally after being released from the furnace;

(3) Put the module obtained in step (2) into a tempering furnace, heat it to 450-500°C at a rate of 60-80°C/h, keep it warm for 4-5h, and then take it out of the furnace, and cool it naturally to room temperature.