CN105349893A - Pre-hardened plastic die steel with oxidation corrosion resistance and high thermal stability and preparation method of pre-hardened plastic die steel - Google Patents

Abstract

The invention discloses pre-hardened plastic die steel with oxidation corrosion resistance and high thermal stability. According to the die steel, based on the element ratio of traditional pre-hardened plastic die steel, the ratio of Ni, Mn, W, Co and other elements is properly increased, and meanwhile the use level of other alloy elements is controlled; on the basis of guaranteeing the mechanical performance of the traditional plastic die steel, the mechanical performance and processing performance of alloy materials are further improved; the pre-hardened plastic die steel has excellent oxidation corrosion resistance and high thermal stability, the surface quality of plastic die pieces is guaranteed, and pouring of plastic pieces of various types can be achieved; and by means of an added rare earth oxide-graphene oxide coated nano tungsten carbide composite modificator, the structure of the die steel is refined, interfacial compatibility of crystals is improved, the reinforcing and toughening effects are remarkable, and the metamorphism effect is even and stable. The die steel is smooth in surface and durable, a preparation method is simple and efficient, the manufacturing cycle is short, and extremely high production and application value is achieved.

Description

Pre-hardened plastic mold steel of a kind of antioxidant anticorrosive high thermal stability and preparation method thereof

Technical field

The present invention relates to plastic die steel product technical field, particularly relate to pre-hardened plastic mold steel of a kind of antioxidant anticorrosive high thermal stability 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 pre-hardened plastic mold steel of a kind of antioxidant anticorrosive high thermal stability and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of pre-hardened plastic mold steel of antioxidant anticorrosive high thermal stability, in this die steel, the weight percentage of each component is: C:0.3-0.4%, Si:0.6-0.8%, Mn:1.8-2.2%, W:1.0-2.0%, Cr:8.5-10.0%, Mo:0.2-0.4%, Nb:0.1-0.2%, Co:1.0-1.5%, P≤0.02%, S≤0.01%, compound modifier: 0.01-0.02%, and all the other are Fe and inevitable impurity.

The pre-hardened plastic mold steel of described a kind of antioxidant anticorrosive high thermal stability, 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 the pre-hardened plastic mold steel of described a kind of antioxidant anticorrosive high thermal stability, 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 1125-1150 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 1080-1140 DEG C, stop forging temperature be 750-780 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, Mn, W, the proportioning of the elements such as Co, 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 antioxidant anticorrosive and high thermal stability ensure that the surface quality of plastic mold, the cast of polytype plastic component can be met 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 any surface finish, 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%, Si:0.6%, Mn:1.8%, W:1.0%, Cr:8.5%, Mo:0.2%, Nb:0.1%, Co:1.0%, 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, 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:

(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 1125 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 1080 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)	72.1
Tensile strength (MPa)	1620
		Impelling strength (J/cm 2)	158.2
Fracture toughness property (MPa.m 1/2)	152.5

The plastic die steel that this embodiment prepares is compared than traditional P20 forging plastic die steel and is on average extended 2.6 times work-ing life, its few surface defects, surface of polished roughness Ra < 0.10 μm.

Claims (3)

1. the pre-hardened plastic mold steel of an antioxidant anticorrosive high thermal stability, it is characterized in that, in this die steel, the weight percentage of each component is: C:0.3-0.4%, Si:0.6-0.8%, Mn:1.8-2.2%, W:1.0-2.0%, Cr:8.5-10.0%, Mo:0.2-0.4%, Nb:0.1-0.2%, Co:1.0-1.5%, P≤0.02%, S≤0.01%, compound modifier: 0.01-0.02%, and all the other are Fe and inevitable impurity.

2. the pre-hardened plastic mold steel of a kind of antioxidant anticorrosive high thermal stability 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, 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.

3. the preparation method of the pre-hardened plastic mold steel of a kind of antioxidant anticorrosive high thermal stability 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 1125-1150 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 1080-1140 DEG C, stop forging temperature be 750-780 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.