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Preparation method of large hot-forging hot-work die steel

A hot work die steel and hot forging technology, which is applied in the field of large-scale hot forging hot work die steel preparation, can solve the problems of low reliability and service life of the die, complex structure and complex stress.

Active Publication Date: 2022-04-29
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the service temperature of the hot forging die reaches 700°C to 1100°C or even higher, coupled with the large size and complex structure of the die, the large size difference in the cavity, the uneven deformation of the material, and the complex force, the reliability of this type of die and extremely low life

Method used

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  • Preparation method of large hot-forging hot-work die steel
  • Preparation method of large hot-forging hot-work die steel
  • Preparation method of large hot-forging hot-work die steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of a kind of large-scale hot forging hot working die steel provided in this embodiment comprises the following steps:

[0035] Step 1: use electric furnace, electric furnace + electroslag remelting or vacuum induction furnace to make steel ingots. The chemical composition weight % of steel ingots is: C: 0.38%, Si: 0.44%, S: 0.002%, P: 0.02%, Mn: 0.62%, Mo: 1.51%, Cr: 3.02%, V: 0.15%, Ni: 1.20%, Al+Nb: ≤0.101% (Al: 0.05%; Nb: 0.051%), B: ≤0.07% , the rest is Fe and unavoidable sundries;

[0036] Step 2: Steel ingot pre-opening: The steel ingot is preheated in two stages. First, the temperature is raised to 600°C at a heating rate of 80°C / h for 1 hour, and then the temperature is raised to 800°C at a heating rate of 80°C / h for 1 hour. The heating rate of ℃ / h is raised to 1170 ℃ for 4 hours, and the pliers are pulled out in one direction after being released from the furnace, and the reduction is 8%;

[0037] Step 3: Pre-opening billet high-tempera...

Embodiment 2

[0044] The preparation method of a kind of large-scale hot forging hot working die steel provided in this embodiment comprises the following steps:

[0045] Step 1: Using electric furnace, electric furnace + electroslag remelting or vacuum induction furnace to make steel ingots, the chemical composition weight % of steel ingots is: C: 0.35%, Si: 0.51%, S: 0.002%, P: 0.02%, Mn: 0.52%, Mo: 1.53%, Cr: 3.05%, V: 0.1%, Ni: 0.91%, Al: ≤0.06%, B: ≤0.08%, the rest is Fe and unavoidable impurities;

[0046] Step 2: Steel ingot pre-opening: The steel ingot is preheated in two stages. First, the temperature is raised to 630°C at a heating rate of 70°C / h for 1 hour, and then the temperature is raised to 830°C at a heating rate of 70°C / h for 1 hour. The heating rate of ℃ / h is raised to 1180 ℃ for 5 hours of high-temperature diffusion, and the pliers are pulled out in one direction after being released from the furnace, and the reduction is 7%;

[0047] Step 3: Pre-opening billet high-temp...

Embodiment 3

[0052] The preparation method of a kind of large-scale hot forging hot working die steel provided in this embodiment comprises the following steps:

[0053] Step 1: use electric furnace, electric furnace + electroslag remelting or vacuum induction furnace to make steel ingots. The chemical composition weight % of steel ingots is: C: 0.39%, Si: 0.35%, S: 0.002%, P: 0.02%, Mn: 0.62%, Mo: 1.62%, Cr: 3.38%, V: 0.26%, Ni: 1.12%, Al+Nb: ≤0.0.7% (Al: 0.04%; Nb: 0.067%), B: 0.1 %, the rest is Fe and unavoidable sundries;

[0054] Step 2: Steel ingot pre-opening: The steel ingot is preheated in two stages. First, the temperature is raised to 650°C at a heating rate of 60°C / h for 1 hour, and then the temperature is raised to 850°C at a heating rate of 60°C / h for 1 hour. The heating rate of ℃ / h is raised to 1190 ℃ for 6 hours, and the pliers are pulled out in one direction after being released from the furnace, and the reduction is 6%;

[0055] Step 3: Pre-opening billet high-temperatu...

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Abstract

The invention discloses a preparation method of large hot-forging hot-work die steel, and belongs to the technical field of hot-work die steel. Comprising the following steps that firstly, an electric furnace is adopted, an electric furnace and electroslag remelting or a vacuum induction furnace is adopted for smelting to prepare a steel ingot, and the steel ingot comprises, by weight, 0.30%-0.39% of C, 0.35%-0.55% of Si, smaller than or equal to 0.002% of S, smaller than or equal to 0.02% of P, 0.50%-0.7% of Mn, 1.40%-1.70% of Mo, 2.60%-3.40% of Cr, 0.10%-0.30% of V, 0.80%-1.20% of Ni, smaller than or equal to 0.2% of Al + Nb, smaller than or equal to 0.1% of B and the balance Fe and inevitable impurities; 2, pre-cogging the steel ingot; thirdly, the pre-opened blank is subjected to high-temperature diffusion; 4, blank forging; and 5, normalizing and spheroidizing annealing. The method has the beneficial effects that by improving the components and the content of steel and using a new forging method, the obtained large-scale hot-forging hot-work die steel is good in obdurability, high in tempering stability and good in high-temperature strength, and the use requirements of the large-section hot-forging hot-work die steel can be met.

Description

technical field [0001] The invention belongs to the technical field of hot work die steel, in particular to a preparation method of large hot forging hot work die steel. Background technique [0002] Hot forging hot work die steel is used for solid metal forming above the recrystallization temperature, and occupies a considerable proportion in hot work die steel. At present, almost all major stress-bearing components are produced by hot forging, especially in various fasteners, standard parts, automobile engines, aircraft and other manufacturing industries, which rely heavily on the hot forging process sex. The main load-bearing components such as main beams and landing gears of the new generation of aircraft, and die forgings for high-end equipment such as engine blades are developing towards the trend of "large-scale, integrated, precise, near-net shape, and low-cost". Since the service temperature of the hot forging die reaches 700°C to 1100°C or even higher, coupled wi...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/54C21D1/28C21D1/32C21D6/00C21D8/00
CPCC22C33/04C22C38/02C22C38/04C22C38/44C22C38/46C22C38/06C22C38/48C22C38/54C21D1/28C21D1/32C21D6/004C21D6/005C21D6/008C21D8/005Y02P10/25
Inventor 周健马党参迟宏宵
Owner CENT IRON & STEEL RES INST
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