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A kind of cold rolled die steel and preparation method thereof

A die steel and molten steel technology is applied to cold-rolled die steel. It can solve the problems of high brittleness and easy cracking of steel, and achieve the effect of improving hardness and wear resistance and excellent mechanical properties

Active Publication Date: 2022-03-04
樟树市兴隆高新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, when using Cr12 steel or high-speed steel as a cold-rolling die, a very prominent problem is that the steel is brittle and easy to crack during use. Therefore, it is necessary to improve the chemical composition of the existing steel and develop new steel types.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A cold-rolled die steel, in terms of mass percentage, has the following components: C: 0.95%, Ni: 0.15%, Si: 0.02%, P: 0.05%, Mo: 0.3%, Zr: 1.11%, Ta: 0.02 %, the balance is Fe and unavoidable impurity elements, and the sum of the mass percentages of each component is 100%.

[0040] In this example, the preparation method of cold-rolled die steel, the specific steps are as follows: batching according to the mass percentage of the components contained in the cold-rolled die steel, melting in an electric arc furnace, the melting temperature is 1700 ° C, the melting time is 2 hours, blowing argon Gas stirring and refining for 1 hour to obtain primary molten steel; vacuum degass primary molten steel at 1700°C and 70 Pa for 25 minutes to obtain high-purity molten steel; cast high-purity molten steel at 1600°C, anneal at 850°C for 12 hours, cool down to 400°C and let it stand for cooling to room temperature to obtain electroslag rods; use a vacuum consumable remelting furnace...

Embodiment 2

[0042] A cold-rolled die steel, in terms of mass percentage, has the following components: C: 1.05%, Ni: 0.28%, Si: 0.09%, P: 0.06%, Mo: 0.41%, Zr: 1.15%, Ta: 0.07 %, the balance is Fe and unavoidable impurity elements, and the sum of the mass percentages of each component is 100%.

[0043] In this example, the preparation method of cold-rolled die steel, the specific steps are as follows: batching according to the mass percentage of the components contained in the cold-rolled die steel, melting in an electric arc furnace, the melting temperature is 1800 ° C, the melting time is 2 hours, blowing argon Gas stirring and refining for 2 hours to obtain primary molten steel; vacuum degas primary molten steel at 1765°C and 75 Pa for 28 minutes to obtain high-purity molten steel; cast high-purity molten steel at 1640°C, anneal at 850°C for 14 hours, cool down to 480°C and let it stand for cooling to room temperature to obtain electroslag rods; use a vacuum consumable remelting furnac...

Embodiment 3

[0045] A cold-rolled die steel, in terms of mass percentage, has the following components: C: 0.95%, Ni: 0.26%, Si: 0.10%, P: 0.05, Mo: 0.3, Zr: 1.16%, Ta: 0.10%, The balance is Fe and unavoidable impurity elements, and the sum of the mass percentages of each component is 100%.

[0046]In this example, the preparation method of cold-rolled die steel, the specific steps are as follows: batching according to the mass percentage of the components contained in the cold-rolled die steel, melting in an electric arc furnace, the melting temperature is 1700 ° C, the melting time is 2 hours, blowing argon Gas stirring and refining for 1.5 hours to obtain primary molten steel; vacuum degas primary molten steel at 1700°C and 80 Pa for 30 minutes to obtain high-purity molten steel; cast high-purity molten steel at 1700°C, anneal at 850°C for 12 hours, cool down to 400°C and let stand Cool to room temperature to obtain electroslag rods; use vacuum consumable remelting furnace to remelt con...

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Abstract

The invention discloses a cold-rolled die steel and a preparation method thereof. The cold-rolled die steel includes C: 0.95-1.2%, Ni: 0.15-0.38%, Si: 0.02-0.16%, P: 0.05-0.08%, Mo: 0.3 ‑0.47%, Zr: 1.11‑1.28%, Ta: 0.02‑0.14%, and the balance is Fe and unavoidable impurity elements. This kind of cold-rolled die steel test bar has excellent mechanical properties, and its hardness can reach more than 242HB. The tensile strength is 710Mpa, and the elongation reaches 13.9%, which balances the wear resistance, impact toughness and hardness of the cold-rolled die steel. While improving the hardness and wear resistance, it has a certain impact toughness to ensure the smooth progress of the stamping process.

Description

technical field [0001] The invention relates to a die steel, in particular to a cold-rolled die steel. Background technique [0002] Alloy abrasive steel can be divided into cold-rolled die steel, hot-work die steel and plastic die steel. Among them, cold-rolled die steel is mainly used to manufacture various molds for pressing and forming metal materials at room temperature. [0003] Compared with cutting tool steel, cold-rolled die steel requires high hardness and wear resistance, high bending strength and sufficient toughness to ensure the smooth progress of the stamping process. The difference is that cold-rolled Die steel The mold shape and processing technology are complex, and the friction area is large, and the possibility of wear is large, so it is difficult to grind. Therefore, the normal reason for the scrapping of cold-rolled dies is generally wear and tear, and there are also premature failures due to fracture, collapse force and deformation. However, usually ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/08C22C38/12C22C38/14C22C33/04C21D8/00
CPCC22C38/02C22C38/08C22C38/12C22C38/14C22C38/002C22C33/04C21D8/005
Inventor 陈帆陈龙闽
Owner 樟树市兴隆高新材料有限公司
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