CN105200326A - Pre-hardened plastic die steel having high abrasion resistance and preparation method thereof - Google Patents

Abstract

The invention discloses pre-hardened plastic die steel having high abrasion resistance. According to the die steel, proportions of elements such as Mn, Ti , Mo, Sr and the like are increased on the basis of proportions of elements of traditional pre-hardened plastic die steel, meanwhile, usage amounts of other alloy elements are controlled, the abrasion resistance and corrosion resistance of an alloy are further improved on the basis that mechanical properties and processability of the traditional plastic die steel are guaranteed, the die steel can be used for pouring of various plastic pieces, by means of an added compound modifier formed by coating a nano tungsten carbide with rare-earth oxides, the organizational structure of the die steel is further improved, strengthening and toughening effects are significant, the wettability of the die steel in a liquid metal is better, 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 has great production and application value.

Description

A kind of high abrasion 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 abrasion 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 abrasion pre-hardened plastic mold steel and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of high abrasion pre-hardened plastic mold steel, in this die steel, the weight percentage of each component is: C:0.3-0.5%, Si:0.1-0.3%, Mn:1-1.5%, Mo:0.1-0.2%, Sr:0.1-0.2%, Al:0.03-0.04%, Ti:1.2-1.5%, Cr:0.04-0.05%, P≤0.03%, S≤0.03%, compound modifier: 0.01-0.02%, and all the other are Fe and inevitable impurity.

Described a kind of high abrasion 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, 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 described a kind of high abrasion 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 1250-1300 DEG C with the temperature rise rate of 80-100 DEG C/h in process furnace, after insulation 2-3h, steel ingot is forged, open forging temperature be 1180-1200 DEG C, stop forging temperature be 900-950 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 550-600 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 increases Mn in the element proportioning of traditional pre-hardened plastic mold steel, Ti and Mo, the proportioning of the elements such as Sr, control the consumption of other alloying elements simultaneously, the basis ensureing conventional plastic die steel mechanical property and processing characteristics further improves the wear resistance and corrosion resistance of alloy, 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 molten metal, modification effect is uniform and stable, this die steel preparation method is simply efficient, and the manufacturing cycle is short, has production application and is worth.

Embodiment

In the die steel of this embodiment, the weight percentage of each component is: C:0.3%, Si:0.1%, Mn:1%, Mo:0.1%, Sr:0.1%, Al:0.03%, Ti:1.2%, Cr:0.04%, P≤0.03%, S≤0.03%, 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 350 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 1250 DEG C with the temperature rise rate of 80 DEG C/h in process furnace, insulation 2h after steel ingot is forged, open forging temperature be 1180 DEG C, stop forging temperature be 900 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 550 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)	62.4
Tensile strength (MPa)	1567.7
		Impelling strength (J/cm 2)	147.4
Fracture toughness property (MPa.m 1/2)	143.2

The plastic die steel that this embodiment prepares is compared than traditional P20 forging plastic die steel and is on average extended 0.8 times work-ing life, and its any surface finish is fine and close, surface of polished roughness Ra < 0.2 μm.

Claims (3)

1. a high abrasion pre-hardened plastic mold steel, it is characterized in that, in this die steel, the weight percentage of each component is: C:0.3-0.5%, Si:0.1-0.3%, Mn:1-1.5%, Mo:0.1-0.2%, Sr:0.1-0.2%, Al:0.03-0.04%, Ti:1.2-1.5%, Cr:0.04-0.05%, P≤0.03%, S≤0.03%, compound modifier: 0.01-0.02%, and all the other are Fe and inevitable impurity.

2. a kind of high abrasion 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, 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 a kind of high abrasion 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 1250-1300 DEG C with the temperature rise rate of 80-100 DEG C/h in process furnace, after insulation 2-3h, steel ingot is forged, open forging temperature be 1180-1200 DEG C, stop forging temperature be 900-950 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 550-600 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.