Manufacturing method of hot-work die steel

A technology of hot work die steel and manufacturing method, applied in manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., can solve problems such as washboard patterns, thermal wear, cracking, etc., and achieve the effect of not easy steel breaking and improving segregation

Inactive Publication Date: 2020-04-17
雷晓芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] If the production method is not good and the heat treatment is not appropriate, then the hot work mold will have plastic deformation, cracking, bluntness, washboard pattern and thermal wear during use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] After the 5H12 round steel is forged, the thickness of the forging is 300mm, and it undergoes spheroidizing annealing treatment. The annealing temperature is 950°C, the holding time is 3.5h, air-cooled to 480-500°C, and the annealing hardness is HBS229. After ultrafine treatment, the ultrafine treatment process is as follows: using water bath circulation quenching includes preheating, heating, and cooling processes, wherein heating and cooling can be carried out in cycles, the preheating temperature is 450 ° C, and the preheating time is 12 hours; heating to 1100℃, 400-600 graded cooling. The number of heating and cooling cycles performed was 3 times. The tempering process includes two temperings, the first tempering: 350 ° C for 4 hours, the temperature is raised to 580 ° C at a heating rate not greater than 50 ° C / h, the temperature is maintained for 6 hours, and water is quenched to room temperature; the second tempering is not greater than 50 ° C Raise the temper...

Embodiment 2

[0024] After the H13 round steel is forged, the thickness of the forging is 350mm, and it undergoes spheroidizing annealing treatment. The annealing temperature is 855°C, the holding time is 2h, air-cooled to 480°C, and the annealing hardness is HBS200. The ultra-fine treatment process is as follows: quenching with water bath circulation includes preheating, heating, and cooling processes, in which heating and cooling can be carried out in cycles. The preheating is segmental preheating, and the preheating temperature is The time is 8 hours; the heating rate at 550°C is not more than 40°C / h, and the heating rate at 850°C is 50°C / h when preheating, heating to 1020°C, and cooling in stages at 350-550°C. The number of heating and cooling cycles performed was 3 times. The tempering process adopts 550-650 high temperature tempering, the first tempering temperature is 560°C, heat preservation for 4 hours, raise the temperature to 630°C at a heating rate not greater than 50°C / h, heat ...

Embodiment 3

[0027] After the 8418 plate is forged, the thickness of the forging is 350mm, and it is treated by spheroidizing annealing. The annealing temperature is 850°C, the holding time is 2.5h, air-cooled to 480°C, and the annealing hardness is HBS205. The ultra-fine treatment process is as follows: quenching with water bath circulation includes preheating, heating, and cooling processes, in which heating and cooling can be carried out in cycles. The preheating is segmental preheating, and the preheating temperature is The time is 8 hours; the heating rate at 550°C is no more than 40°C / h, and the heating rate at 850°C is 30°C / h when preheating to 1150°C, and the cooling is staged at 350-550°C. The number of heating and cooling cycles performed was 5 times. The first tempering temperature is 720°C, hold for 0.5h, raise the temperature to 1030°C at a rate of no more than 50°C / h, hold for 2h, and quench to room temperature; Raise the temperature to 720°C at a rate of 4 hours, then raise...

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PUM

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Abstract

The invention discloses a manufacturing method of hot-work die steel. The method is characterized by including the steps: blank forging, annealing, mechanical roughening, finish machining forming, quenching, high-temperature tempering, fitter trimming, polishing, mold assembling and mold testing; and the hot-work die steel is one of 5H12, H13 and 8418. According to the method, water-bath cyclic quenching treatment is adopted to transform a massive lamellar structure of the steel into a uniform and fine structure, and the steel is not liable to break. The effects of rapid heating and cyclic treatment are fully utilized, heating is rapidly performed, a large number of austenite crystal nuclei are generated, and fine grains appear and are obtained; and the faster the process is carried out, the greater the temperature difference is, and the better the obtained refining effect is.

Description

technical field [0001] The present application relates to the technical field of metal processing, in particular to a method for manufacturing hot work die steel. Background technique [0002] Hot working dies are tooling used to make heated metal or liquid metal into desired products, such as hot forging dies, hot heading dies, hot extrusion dies, die-casting dies and high-speed forming dies, etc. [0003] All kinds of hot work dies work at higher temperatures, especially in the hot extrusion of steel and the die casting of steel. The temperature of steel is in the range of 1200-1500 ° C. The performance requirement is the heat resistance of steel, followed by toughness and thermal fatigue resistance. The various mold steels used in hot work molds are collectively referred to as hot work mold steels. [0004] After the hot work die steel is forged, it needs to be heat treated. Heat treatment is an indispensable and important process in the manufacture of hot work die ste...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/64B23P15/24
CPCB23P15/24C21D1/64C21D9/0068C21D2211/001C21D2211/004
Inventor 雷晓芳
Owner 雷晓芳
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