CN105177438A - High-plasticity corrosion-resistant temperature-resistant pre-hardening plastic die steel and preparation method thereof - Google Patents

Abstract

The invention discloses a high-plasticity corrosion-resistant temperature-resistant pre-hardening plastic die steel, and according to the die steel, the ratio of the elements such as Mn, Mo, Cr and Ti are properly improved based on the element ratio of a conventional pre-hardening plastic die steel, meanwhile, the usage of other alloy elements is controlled, so that the mechanical properties and pouring cutting properties of the alloy are further improved on the basis of the mechanical properties and processability of the conventional plastic die steel, and the die steel has excellent strength, wear resistance, high temperature resistance and oxidation resistance and corrosion resistance, is better in plasticity, and easy to cut and form, can be used for pouring plastic parts of various types, moreover, a tissue structure of the die steel is further improved by an added rare earth oxide-cladded nano tungsten carbide composite modifier, so that a reinforcing and toughening effect is obvious, and the wettability with alloy fluid is better, and a metamorphism effect is uniform and stable; a preparation method of the die steel is simple and efficient, short in manufacturing period and capable of greatly improving the quality of plastic products and has high production and application value.

Description

Anti-rotten heatproof pre-hardened plastic mold steel of a kind of high-ductility and preparation method thereof

Technical field

The present invention relates to plastic die steel product technical field, particularly relate to anti-rotten heatproof pre-hardened plastic mold steel of a kind of high-ductility 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 anti-rotten heatproof pre-hardened plastic mold steel of a kind of high-ductility and preparation method thereof.

The present invention is achieved by the following technical solutions:

The anti-rotten heatproof pre-hardened plastic mold steel of a kind of high-ductility, in this die steel, the weight percentage of each component is: C:0.3-0.5%, Si:0.4-0.5%, Mn:1.2-1.6%, Mo:0.6-0.8%, V:0.01-0.02%, Cr:2.2-2.5%, Ti:0.04-0.05%, B≤0.003%, P≤0.02%, S≤0.01%, compound modifier: 0.01-0.02%, and all the other are Fe and inevitable impurity.

The anti-rotten heatproof pre-hardened plastic mold steel of described a kind of high-ductility, described compound modifier is made up of the raw material of following weight percent: oxide nano rare earth 2-3, nanometer tungsten carbide 8-10, 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 subsequently, ultrasonic agitation process 40-50min, nanometer tungsten carbide is added after it disperses completely, continue ultrasonic agitation mixing 1-2h, in 300-400 DEG C of baking oven, carry out drying treatment after stirring terminates, after complete drying, the abundant grinding distribution of powder, obtains the compound modifier of rare earth oxide clad nanometer tungsten carbide.

The preparation method of the anti-rotten heatproof pre-hardened plastic mold steel of described a kind of high-ductility, 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 1180-1230 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 1130-1200 DEG C, stop forging temperature be 800-850 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 520-560 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 Mn in the element proportioning of traditional pre-hardened plastic mold steel, Mo, Cr, the proportioning of the elements such as Ti, control the consumption of other alloying elements simultaneously, the basis ensureing conventional plastic die steel mechanical property and processing characteristics further improves mechanical property and the cast cutting ability of alloy, it has excellent intensity and wear-resistant high temperature oxidation corrosive nature, plasticity is good, be easy to forming and cutting, the cast of polytype plastic component can be met use, the rare earth oxide clad nanometer tungsten carbide compound modifier added further improves the weave construction of die steel, activeness and quietness Be very effective, better with the wetting property of aluminium alloy, modification effect is uniform and stable, this die steel preparation method is simply efficient, and the manufacturing cycle is short, can improve the quality of plastics greatly, has production application and is worth.

Embodiment

In this embodiment die steel, the weight percentage of each component is: C:0.3%, Si:0.4%, Mn:1.2%, Mo:0.6%, V:0.01%, Cr:2.2%, Ti:0.04%, B≤0.003%, P≤0.02%, S≤0.01%, 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, nanometer tungsten carbide 8, 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 subsequently, ultrasonic agitation process 40min, nanometer tungsten carbide is added after it disperses completely, continue ultrasonic agitation mixing 1h, in 300 DEG C of baking ovens, carry out drying treatment after stirring terminates, after complete drying, the abundant grinding distribution of powder, obtains the compound modifier of rare earth oxide clad nanometer tungsten carbide.

The preparation method of this plastic die steel 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 1180 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 1130 DEG C, stop forging temperature be 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 520 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)	58.4
Tensile strength (MPa)	1544
		Impelling strength (J/cm 2)	146.8
Fracture toughness property (MPa.m 1/2)	142.0

The plastic die steel that this embodiment prepares is compared than traditional P20 forging plastic die steel and is on average extended 1.2 times work-ing life, its few surface defects, surface of polished roughness Ra < 0.20 μm.

Claims (3)

1. the anti-rotten heatproof pre-hardened plastic mold steel of high-ductility, it is characterized in that, in this die steel, the weight percentage of each component is: C:0.3-0.5%, Si:0.4-0.5%, Mn:1.2-1.6%, Mo:0.6-0.8%, V:0.01-0.02%, Cr:2.2-2.5%, Ti:0.04-0.05%, B≤0.003%, P≤0.02%, S≤0.01%, compound modifier: 0.01-0.02%, and all the other are Fe and inevitable impurity.

2. the anti-rotten heatproof pre-hardened plastic mold steel of a kind of high-ductility as claimed in claim 1, is characterized in that: described compound modifier is made up of the raw material of following weight part: oxide nano rare earth 2-3, nanometer tungsten carbide 8-10, 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 subsequently, ultrasonic agitation process 40-50min, nanometer tungsten carbide is added after it disperses completely, continue ultrasonic agitation mixing 1-2h, in 300-400 DEG C of baking oven, carry out drying treatment after stirring terminates, after complete drying, the abundant grinding distribution of powder, obtains the compound modifier of rare earth oxide clad nanometer tungsten carbide.

3. the preparation method of the anti-rotten heatproof pre-hardened plastic mold steel of a kind of high-ductility as claimed in claim 1, it is characterized in that, 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 1180-1230 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 1130-1200 DEG C, stop forging temperature be 800-850 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 520-560 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.