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Low alloy die steel

A die steel and low alloy technology, which is applied in the manufacture of precision and complex moulds and low alloy cold work die materials, can solve problems such as reducing material toughness, and achieve the effect of improving performance, preventing brittleness and improving performance indicators.

Active Publication Date: 2012-09-26
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material contains relatively high chromium, molybdenum, and vanadium elements, and chromium is one of the main reasons for the unevenness of carbides, and it is easy to form network carbides, reducing the toughness of the material

Method used

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Examples

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Embodiment 1

[0044] In this example, the composition and weight percentage of the cold work die steel are as follows:

[0045] C: 0.69%, Si: 0.72%, Mn: 0.89%, Cr: 2.33%, Mo: 0.25%, V: 0.25%, Ni: 0.37%, P: 0.016%, S: 0.011%, and the balance is Fe.

[0046] In the present embodiment, the process and steps of cold working die steel are as follows:

[0047] The steel ingot cast after smelting in an induction furnace is placed in the electroslag remelting device as a consumable electrode for electroslag remelting, and the liquid metal falls through the slag layer of the slag pool to the water-cooled crystallizer below, and then re-melted Solidify into 2.0 tons of steel ingot; heat the above steel ingot, the temperature of the steel ingot into the furnace is 750°C, the temperature of the steel ingot is 110°C, and the steel ingot is heated to 1230°C for 4 hours and then forged; the initial forging temperature: 1100°C, the final The forging temperature is 870°C.

[0048] The heat-treated hardnes...

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Abstract

The invention relates to a low alloy die steel material which comprises the following components by weight: 0.68-0.78% of C, 0.7-1.0% of Si, 0.7-1.1% of Mn, not more than 0.02% of P, not more than 0.02% of S, 2.2-2.5% of Cr, 0.2-0.3% of Mo, 0.15-0.35% of V, 0.3-0.4% of Ni, the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: performing smelting and casting of the components to obtain a steel ingot; adding the steel ingot into a radial forging machine heating furnace at 600-800 DEG C, heating to 1200-1230 DEG C with a heating speed of 60-120 DEG C / h, then performing thermal insulation for 3-5 hours; forging in a forging machine to obtain steel materials with an initial forging temperature of 1050-1100 DEG C and a final forging temperature of not less than 850 DEG C. After the obtained die steel is subject to quenching at 910-950 DEG C and tempering heat treatment at 160-200 DEG C, the impact toughness is above 135 J / cm2, and the hardness HRC is above 62.

Description

technical field [0001] The invention relates to a cold work die steel, in particular to a low-alloy cold work die material with good hardenability, low quenching temperature, small heat treatment deformation, low alloy cost, and good strength and toughness. Manufacture of precision and complex molds for cold forming. Background technique [0002] Cold working dies are used for blanking, stretching, bending, cold extrusion, cold heading and other processes of metal or non-metal materials. The working object is at room temperature, and the working conditions of the mold are quite harsh. The cold work die steel usually selected requires sufficient strength, toughness, hardness, wear resistance and fatigue resistance. For large-load cold extrusion and cold heading forging dies, materials are required to have higher resistance to deformation and fracture. [0003] At present, the most widely used cold work die steel material in the domestic and foreign mold material market is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C22C33/04B22D23/10C21D1/18
Inventor 续维王庆亮吴晓春邓黎辉
Owner 宝武特种冶金有限公司
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