Preparation method of cold work die steel material

A technology of cold work die steel and alloy composition, applied in the direction of manufacturing tools, heat treatment equipment, quenching agents, etc., can solve the problems of low toughness and can not meet the needs of machining

Inactive Publication Date: 2014-01-01
CHUZHOU XINLONG ELECTROMECHANICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used mold steel material in the mold material market is high-carbon high-chromium mold steel. Its strength and hardness are generally easy to meet, but its toughness is low and cannot meet the needs of machining.

Method used

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Embodiment Construction

[0008] A preparation method of cold work die steel material, including melting, oxidation, detection and adjustment of alloy composition, refining, casting, heat treatment, the weight percentage of its chemical elements is: carbon 0.8-0.9, silicon 1.1-1.3, manganese 2.1-2.3 , molybdenum 0.8-0.9, nickel 0.1-0.15, titanium-.6-0.7, chromium 1.1-1.2, aluminum 0.3-0.4, Hf1-2, Nb0.06-0.08, Bi2.5-2.8, Sb0.03-0.05, Both S and P are less than 0.03, and the balance is iron;

[0009] Heat treatment means: the casting is heated up to 910-935°C at a rate of 210-230°C / hour, and held for 4-6 hours; then, the temperature is raised to 1060-1085°C at a rate of 35-55°C / hour, and held for 1-2 hours; Then cool down to 320-340°C at a rate of 170-190°C / hour and keep warm for 2-3 hours; then cool down to 160-180°C at a rate of 40-70°C / hour and keep warm for 2-3 hours; then heat at 90-100°C Raise the temperature to 560-580°C at a rate of / hour, and keep it warm for 2-3 hours; then put it into 0°C wa...

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Abstract

The invention discloses a preparation method of a cold work die steel material. The preparation method comprises steps of fusion, oxidation, detection and adjustment of alloy composition, refining, casting and heat treatment. The cold work die steel material comprises following chemical elements, by weight, 0.8 to 0.9 portion of carbon, 1.1 to 1.3 portions of silicon, 2.1 to 2.3 portions of manganese, 0.8 to 0.9 portion of molybdenum, 0.1 to 0.15 portion of nickel, 0.6 to 0.7 portion of titanium, 1.1 to 1.2 portions of chromium, 0.3 to 0.4 portion of aluminium, 1 to 2 portions of Hf, 0.06 to 0.08 portion of Nb, 2.5 to 2.8 portions of Bi, 0.03 to 0.05 portion of Sb, S less than 0.03 portion, P less than 0.03 portion, and the balance iron. According to the cold work die steel material, molybdenum, nickel and chromium alloy elements are capable of stabilizing pearlite; aluminium is capable of increasing heat resistance of the cold work die steel material, and promoting fusion of graphitized alloy elements of all stages into the cold work die steel material significantly; and useful actions of molybdenum, nickel and chromium are maintained by adjustment of alloy composition. Cracking of the cold work die steel material is difficult to happen, and the cold work die steel material is capable of reducing impact toughness.

Description

technical field [0001] The invention relates to a mold material, in particular to a cold working mold steel. It is used for cold work manufacturing of various precision and complex moulds. Background technique [0002] Dies are used for blanking, stretching, bending, extrusion, upsetting and other processes of metal or non-metal materials. Die steel requires sufficient strength, toughness, hardness, wear resistance, fatigue resistance, deformation resistance, and fracture resistance. At present, the most widely used mold steel material in the mold material market is high-carbon high-chromium mold steel. Its strength and hardness are generally easy to meet, but its toughness is low and cannot meet the needs of machining. Contents of the invention [0003] The object of the present invention is to provide a kind of cold work die steel and its preparation method, which has good strength and toughness, and is used for the manufacture of precision and complex dies for cold wo...

Claims

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Application Information

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IPC IPC(8): C22C38/60C21D6/00C21D1/18C21D1/60C21D1/613
Inventor 鲍小曼
Owner CHUZHOU XINLONG ELECTROMECHANICAL
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