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Hot work die steel and its preparation method

A technology of hot work die steel and production methods, which is applied in the direction of manufacturing tools, heat treatment process control, heat treatment equipment, etc., can solve the problems of complex production methods, high alloy content, high cost, etc., and achieve simplified manufacturing methods and alloying element components Reasonable and save the cost of spare parts

Active Publication Date: 2007-02-14
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal hardness of 5CrW2Si steel is not as good as that of 3Cr2W8V steel, but the alloy content of 3Cr2W8V steel is high, and the production method is relatively complicated. When smelting with intermediate frequency furnace, electroslag remelting is necessary to reduce the segregation of carbides, and its price is also high. Use these materials The cost is also relatively high when making hot work molds for medium temperature use

Method used

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  • Hot work die steel and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0016] According to the composition of each alloy element specified in Table 1, the steel for hot shear blades produced by using common steelmaking equipment and the smelting method of ordinary medium carbon steel, after forging, the forging temperature is 1150 ° C, and the final forging is ≥ 850 ° C; Heat treatment: Quenching at 1050°C, tempering at 590°C, stress relief tempering at 200°C after finishing. The manufacturing method and the hardness of the hot shear blades are listed in Table 2. The shear blades used for 250 tons of flying shears cut HRB335 and HRB400 ribbed steel bars with a diameter of 16-22mm at about 1000 ° C. The actual temperature of the shear blades during work 460-620°C, the test conditions are listed in Table 3.

Embodiment 2

[0018] By the composition of each alloy element specified in Table 1, repeat the method of Example 1 to make thermal shear blades, its manufacturing method and thermal shear blade hardness are listed in Table 2, and the test conditions are listed in Table 3.

Embodiment 3

[0020] By the composition of each alloy element specified in table 1, repeat the method of embodiment 1, the hot shear blade made, its manufacturing method and the hot shear blade hardness are listed in table 2, and test situation is listed in table 3.

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Abstract

The invention relates to hot-work die steel and its manufacturing method. It includes the following alloying element: 0.40-0.48wt% C, 0.60-1.00wt% Si, 0.30-0.80wt% Mn, less than 0.030wt% P, S, 2.20-2.70wt% Cr, 0.90-1.20wt% W, 0.80-1.00wt% Mo, 0.70-1.00wt% V, rest Fe and impurity. The method includes the following steps: adopting common steel facility, common medium steel smelting technology to smelt as the given constituent; forging; heat processing; making hot-work die. It has the advantages of reasonable alloy element composition, simplifying technology, lowering the cost. And it is fit for making tool die at 400-650 degree centigrade, such as cutting edge etc.

Description

technical field [0001] The invention belongs to alloy steel and its manufacturing method, in particular to hot work die steel and its manufacturing method. Background technique [0002] Hot work die steel is used at high temperature, and the key to improving its service life is to improve its thermal hardness. In addition, it also requires higher toughness and fatigue properties. The Chinese GB1299-2000 standard reports 5CrW2Si, 6CrW2Si, 3Cr2W8V, 4Cr5MoSiV steel and other commonly used hot work die steels (5CrW2Si and 6CrW2Si are both impact-resistant tool steels and hot work die steels), the composition of 5CrW2Si: 0.45-0.55% C, 0.50-0.80% Si, ≤0.40% Mn, ≤0.030% P, S, 1.00-1.30% Cr, 2.00-2.50% W; 3Cr2W8V composition: 0.30-0.40% C, ≤0.40% Si, ≤0.40% Mn, ≤0.030% P, S, 2.20-2.70% Cr, 7.50-9.00% W, 0.20-0.50% V; 1.10-1.60% Mo, 0.30-0.60% V. The thermal hardness of 5CrW2Si steel is not as good as that of 3Cr2W8V steel, but the alloy content of 3Cr2W8V steel is high, and the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C22C33/04B21J5/00C21D1/18C21D11/00
Inventor 完卫国彭大成
Owner MAANSHAN IRON & STEEL CO LTD
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