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Cold work die steel and preparation method thereof

A technology of cold working die steel and molten steel, which is applied in the field of alloy materials, can solve problems such as uneven distribution of carbides, lower mechanical properties of steel, and easy appearance of surface cracks, and achieve the effects of light weight, long service life, and small heat treatment deformation

Active Publication Date: 2016-11-23
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of cold work die steel belongs to ledeburite steel. Since the steel contains a large amount of carbide-forming elements such as Cr, Mo, and V, a large amount of eutectic carbides will be formed during solidification and eutectoid transformation, resulting in the thermoplasticity of the steel. Poor, prone to surface cracks during forging
At the same time, although the fishbone-shaped eutectic carbides can be broken through the forging deformation process, the distribution of carbides in large-section steel is still uneven due to the influence of forging direction; the distribution of large-grained carbides or carbides in steel is uneven. When the uniformity is serious, the mechanical properties of the steel will be reduced, and it will cause quality problems such as deformation and cracking of the mold during the heat treatment process, and as the size of the forging material increases, the unevenness of the eutectic carbide will become more and more serious

Method used

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  • Cold work die steel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Cold work die steel, including the following components in weight percentage: C 3.5%, Si 4.2%, Mn 0.44%, Cr 9.8%, Mo 0.78%, W 2.16%, V 2.20%, P 0.10%, S 0.02%, Cu 0.35%, Mg 0.64%, Ti0.36%, Sr 0.77%, Zr 0.77%, B 0.49%, Zn 1.00%, Re 0.17%, Sn 0.26%, Pb 0.62%, Be 0.10%, Sc 0.15%, Li 0.46%, Ni 0.55%, La 0.02%, Al 0.14%, the rest is iron, and the sum of the mass percentages of each component is 100%.

[0022] The present invention also provides the preparation method of above-mentioned cold working die steel, comprises the following steps:

[0023] (1) Smelting each raw material at 1500°C for 5 hours, blowing argon and stirring at 1500°C for 2 hours to obtain primary molten steel;

[0024] (2) Vacuum degas the primary molten steel at 1500°C and 80 Pa for 20 minutes to obtain high-purity molten steel;

[0025] (3) Casting high-purity molten steel at 1400°C, annealing at 800°C for 12 hours, cooling down to 400°C and standing to cool to room temperature to obtain electroslag ...

Embodiment 2

[0030] Cold work die steel, including the following components in weight percentage: C 3.6%, Si 4.3%, Mn 0.46%, Cr 9.5%, Mo 0.76%, W 2.12%, V 2.24%, P 0.11%, S 0.03% , Cu 0.33%, Mg 0.62%, Ti0.34%, Sr 0.75%, Zr 0.80%, B 0.50%, Zn 1.04%, Re 0.16%, Sn 0.25%, Pb 0.63%, Be 0.11%, Sc 0.16%, Li 0.47%, Ni 0.53%, La 0.01%, Al 0.14%, the rest is iron, and the sum of the mass percentages of each component is 100%.

[0031] The present invention also provides the preparation method of above-mentioned cold working die steel, comprises the following steps:

[0032] (1) Smelting each raw material at 1600°C for 3 hours, blowing argon and stirring at 1600°C for 1 hour to obtain primary molten steel;

[0033] (2) Vacuum degas the primary molten steel at 1600°C and 60-80Pa for 10 minutes to obtain high-purity molten steel;

[0034](3) Cast high-purity molten steel at 1500°C, anneal at 900°C for 8 hours, cool down to 500°C and let it stand to cool to room temperature to obtain electroslag rods;...

Embodiment 3

[0039] Cold work die steel, including the following components by weight: C 3.3%, Si 4.1%, Mn 0.42%, Cr10.0%, Mo 0.80%, W2.22%, V 2.18%, P 0.09%, S 0.01% , Cu0.36%, Mg0.66%, Ti0.40%, Sr0.80%, Zr0.74%, B0.48%, Zn0.98%, Re0.18%, Sn0.27%, Pb0.59%, Be0.09%, Sc 0.14%, Li 0.47%, Ni 0.57%, La 0.03%, Al 0.13%, the rest is iron, and the sum of the mass percentages of each component is 100%.

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PUM

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Abstract

The invention provides cold work die steel. The cold work die steel comprises C, Si, Mn, Cr, Mo, W, V, P, S, Cu, Mg, Ti, Sr, Zr, B, Zn, Re, Sn, Pb, Be, Sc, Li, Ni, La, Al and the balance iron, wherein the sum of the mass percentages of the components is 100%. The nodular cast iron comprises multiple kinds of nonmetal, metal and transition metal elements. Because the elements are added and cooperate with one another, the oxidation resistance, the corrosion resistance, the abrasion resistance, the compression resistance and the shock resistance of a compressor cylinder block of an air conditioner are improved, and the service life of the compressor cylinder block of the air conditioner under severe working conditions is prolonged.

Description

technical field [0001] The invention belongs to the field of alloy materials, and in particular relates to a cold working die steel and a preparation method of the die steel. Background technique [0002] Molds are the basic process equipment for industrial products such as machinery, electronics, automobiles, communications, and dots. Due to the high efficiency and economy of using molds for processing and molding, the application of molds in the material processing and molding industry is very common. During the use of the mold, its quality is affected by many factors, such as shape design, processing quality, surface treatment, actual working parameters, etc., among which the material used in the mold itself is the most influential. [0003] Alloy abrasive steel can be divided into cold work die steel, hot work die steel and plastic die steel, among which cold work die steel is mainly used to manufacture various molds for pressing and forming metal materials at room temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10
CPCC22C37/08C22C37/10
Inventor 王文唐明奇谭兆钧
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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