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Production of high-alloy cold mould steel

A technology of cold working die steel and production technology, applied in metal processing equipment, metal rolling, manufacturing tools, etc., can solve the problems of high cost, high energy consumption, complicated process, etc., and achieve simplified process and fine carbide particle size , the effect of excellent spherical organization

Active Publication Date: 2007-12-05
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In view of the existing problems such as complex procedures, high cost, and large energy consumption in the production of high-alloy cold-work die steel due to the use of powder metallurgy technology, the purpose of the present invention is to provide a production process for high-alloy cold-work die steel, which will spray Forming technology, one-time large-deformation hot rolling and isothermal spheroidizing heat treatment organically combine the production process, which can produce high-alloy cold-working die steel with excellent spheroidized structure without segregation

Method used

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  • Production of high-alloy cold mould steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Alloy composition (chemical analysis results, weight percentage)

[0037] 1.52C, 8.0Cr, 4.0V, 1.48Mo, ​​1.0Si, 0.35Mn, remaining Fe.

[0038] (2) Prepare the blank by spray forming

[0039] Put the master alloy raw material into the induction furnace to heat and melt, and keep it at a temperature of 150-250°C higher than the melting point for 5 minutes to make the temperature and composition of the melt uniform; Spray, make it atomized into fine droplets, fly and deposit on the collecting substrate, complete solidification and form a circular blank weighing about 2Kg.

[0040] (3) Hot rolling of spray-formed billets

[0041] Cut a 16mm thick strip billet from the injection forming billet, and one end of the billet is processed into a wedge shape, which is convenient for biting in during hot rolling. Put the billet into the heating furnace which has reached 300°C and heat it up to 600°C for 5 minutes for preheating, then raise the temperature to 950°C for 15 minut...

Embodiment 2

[0045] (1) Alloy composition (chemical analysis results, weight percentage)

[0046] 1.51C, 8.01Cr, 3.9V, 1.47Mo, 1.0Si, 0.4Mn, remaining Fe.

[0047] (2) Prepare the blank by spray forming

[0048] With embodiment 1.

[0049] (3) Hot rolling of spray-formed billets

[0050] Cut a 16mm thick strip billet from the injection forming billet, and one end of the billet is processed into a wedge shape, which is convenient for biting in during hot rolling. Put the billet into the heating furnace which has reached 300°C and heat it up to 700°C for 5 minutes for preheating, then raise the temperature to 1050°C for 20 minutes of heat preservation, take it out and immediately send it to a hot rolling machine with a maximum rolling force of 3000KN Rolling is carried out on the machine, and the billet is rolled to a thickness of 6.4mm in a single pass, and the reduction is 60%. After rolling, the sheet is immediately sand-cooled, and no cracking is found.

[0051] (4) Isothermal sphero...

Embodiment 3

[0054] (1) Alloy composition (chemical analysis results, weight percentage)

[0055] 1.53C, 8.1Cr, 4.0V, 1.47Mo, 1.1Si, 0.37Mn, remaining Fe.

[0056] (2) Prepare the blank by spray forming

[0057] With embodiment 1.

[0058] (3) Hot rolling of spray-formed billets

[0059] Cut a 16mm thick strip billet from the injection forming billet, and one end of the billet is processed into a wedge shape, which is convenient for biting in during hot rolling. Put the billet into the heating furnace which has reached 300°C and heat it up to 700°C for 5 minutes for preheating, then raise the temperature to 1150°C for 10 minutes of heat preservation, take it out and immediately send it to a hot rolling machine with a maximum rolling force of 3000KN Rolling is carried out on the machine, and the billet is rolled to a thickness of 6.4mm in a single pass, and the reduction is 70%. After rolling, the sheet is immediately sand-cooled, and no cracking is found.

[0060] (4) Isothermal sphero...

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Abstract

A technique for manufacturing high-alloy die steel which includes the following steps: the die steel is made up of 1.45-1.55% C,7.8-8.2% Cr,3.9-4.1% V,1.4-1.6% Mo,0.9-1.1%Si,0.3-0.5% Mn,and Fe the rest;The steel blank was made by spray-up method; one-pass roller, sand cooling and isothermal spheroidizing was adopted. The high-alloy die steel produced by this method has fine carbide particle size in its spheroidized structure so that the alloy segregation and carbide clustering problems were resolved. Advantages are technique simplification and low energy cost.

Description

technical field [0001] The patent of the invention relates to a production process of high-alloy cold-working die steel. Background technique [0002] Due to the high carbon and alloy content of high-alloy cold-working die steel, it is difficult to avoid composition segregation, carbide aggregation and ledeburite structure that is not conducive to subsequent processing when produced by conventional smelting and casting processes. [0003] Cr12MoV (or American brand D2 steel) is a typical cold work die steel widely used. This kind of steel has high carbon and chromium content. It is produced by conventional technology, and the composition segregation and the formation of serious eutectic carbide cannot be avoided. Therefore, it is usually necessary to repeatedly forge the obtained billet in order to reduce or improve the above-mentioned defects. The hardenability and heat treatment deformability of Cr12MoV steel are better among many cold work die steels, but its toughness i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22B22D17/00B21B37/00C21D6/00C21D7/13
Inventor 史海生樊俊飞乐海荣金冰忠彭勇颜飞徐洲
Owner BAOSHAN IRON & STEEL CO LTD