CN105200343A - Pre-hardened plastic die steel having high acid corrosion resistance and preparation method thereof - Google Patents

Abstract

The invention discloses pre-hardened plastic die steel having high acid corrosion resistance. According to the die steel, proportions of elements such as Cr, Mo, V, Mg and the like are properly increased on the basis of proportions of elements of traditional pre-hardened plastic die steel, meanwhile, usage amounts of other alloy elements are controlled, mechanical properties and processability of an alloy material are further improved on the basis that mechanical properties of the traditional plastic die steel are guaranteed, the die steel has the excellent acid corrosion resistance and is low in corrosion ratio at the high temperature, the surface is not abraded easily, by means of an added compound modifier formed by coating a nano tungsten carbide with rare-earth oxide-graphene oxides, the organizational structure of the die steel is refined, the interfacial compatibility among crystals is improved, strengthening and toughening effects are significant, and the modification effect is uniform and stable. A preparation method of the die steel is simple and efficient, the manufacturing period is short, and the die steel is durable, can effectively improve surface quality of plastic pieces and has great production and application value.

Description

A kind of high resistance to acid attack 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 resistance to acid attack 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 resistance to acid attack pre-hardened plastic mold steel and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of high resistance to acid attack pre-hardened plastic mold steel, in this die steel, the weight percentage of each component is: C:0.4-0.5%, Si:0.5-0.8%, Mn:1.5-2.0%, Cr:7.5-8.0%, Mo:0.4-0.5%, V:0.1-0.2%, Ni:3.0-4.0%, Mg:1.0-1.2%, P≤0.02%, S≤0.01%, compound modifier: 0.01-0.02%, and all the other are Fe and inevitable impurity.

The high resistance to acid attack pre-hardened plastic mold steel of described one, 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 resistance to acid attack 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 1050-1125 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 1000-1080 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 Cr in the element proportioning of traditional pre-hardened plastic mold steel, Mo, V, the proportioning of the elements such as Mg, 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, it has excellent acidresistant property, corrosion rate is low under the high temperature conditions, surface is not easy to wear, 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 preparation method is simply efficient, and the manufacturing cycle is short, durable in use, effectively can improve the surface quality of plastic component, has production application and is worth.

Embodiment

In this embodiment die steel, the weight percentage of each component is: C:0.4%, Si:0.5%, Mn:1.5%, Cr:7.5%, Mo:0.4%, V:0.1%, Ni:3.0%, Mg: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 1050 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 1000 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)	70.2
Tensile strength (MPa)	1665
		Impelling strength (J/cm 2)	163.5
Fracture toughness property (MPa.m 1/2)	148.6

The plastic die steel that this embodiment prepares is compared than traditional P20 forging plastic die steel and is on average extended 1.9 times work-ing life, and acid-resistant corrosion is good, surface of polished roughness Ra < 0.20 μm.

Claims (3)

1. one kind high resistance to acid attack pre-hardened plastic mold steel, it is characterized in that, in this die steel, the weight percentage of each component is: C:0.4-0.5%, Si:0.5-0.8%, Mn:1.5-2.0%, Cr:7.5-8.0%, Mo:0.4-0.5%, V:0.1-0.2%, Ni:3.0-4.0%, Mg:1.0-1.2%, P≤0.02%, S≤0.01%, compound modifier: 0.01-0.02%, and all the other are Fe and inevitable impurity.

2. a kind of high resistance to acid attack pre-hardened plastic mold steel 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 a kind of high resistance to acid attack pre-hardened plastic mold steel 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 1050-1125 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 1000-1080 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.