A kind of cold working die steel cr8 and its production method

A technology of cold work die steel and production method, applied in the field of iron and steel materials, can solve the problems of easy brittle cracking, poor impact toughness, brittle cracking, etc., and achieve the effects of less surface decarburization, good wear resistance and wide application.

Inactive Publication Date: 2011-12-14
广东金型重工有限公司
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Problems solved by technology

[0004] The first object of the present invention is to provide a steel with high hardness, Cr8, a cold work die steel with high wear resistance, high hardenability and good toughness, can avoid brittle cracks caused by poor toughness, and has the characteristics of low price

Method used

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  • A kind of cold working die steel cr8 and its production method

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specific Embodiment 1

[0040] A kind of production method of cold working die steel Cr8, carries out according to the following steps:

[0041] 1) Preliminary smelting in an intermediate frequency furnace:

[0042] 1-1) Tapping capacity of intermediate frequency furnace: 30-32T / furnace, ingredient structure: 4t of Cr-Fe alloy material, 27t of scrap steel material, and 180Kg of high Mn alloy material;

[0043] 1-2) Add part of the scrap steel material in the above batching structure into the intermediate frequency furnace first, then add the waste electrode block with adjusted carbon content into the furnace, and then add scrap steel material to press the waste electrode block until it melts; when the furnace When the molten steel is cleared (scrap steel is converted into molten steel) about 1 / 2, sampling analysis is carried out, and the weight percentage of C in the molten steel in the furnace is adjusted to 1.10% according to the results of the laboratory test sheet. When the weight percentage of C...

specific Embodiment 2

[0054] The characteristics of this embodiment are: in step 3-2), when the temperature is higher than 1500 ° C, sampling and analysis of components, according to the test sheet, the weight percentage of each chemical component in the molten steel in the furnace is adjusted to: C: 1.15 %, Mn: 0.40%, Si: 0.30%, P: 0.020%, S: 0.020%, Cr: 7.50%, Cu: 0.20%, and the balance is iron; others are the same as in Example 1.

specific Embodiment 3

[0055] The characteristics of this embodiment are: in step 3-2), when the temperature is higher than 1500 ° C, sampling and analysis of components, according to the test sheet, the weight percentage of each chemical component in the molten steel in the furnace is adjusted to: C: 1.20 %, Mn: 0.60%, Si: 0.40%, P: 0.030%, S: 0.030%, Cr: 8.00%, Cu: 0.25%, and the balance is iron; others are the same as in Example 1.

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Abstract

The invention relates to a cold work die steel Cr8 and a production method thereof. The chemical composition of the cold work die steel Cr8 is as follows according to weight percentage: C: 1.10-1.20%, Mn: 0.30-0.60%, Si≤0.40 %, P≤0.030%, S≤0.030%, Cr: 7.00~8.00%, Cu≤0.25%, and the balance is iron. The production method of cold work die steel Cr8 is carried out according to the following steps: 1) preliminary smelting in an intermediate frequency furnace; 2) tapping; 3) refining in a refining furnace, and then on a continuous casting machine; 4) heating and rolling with heat treatment. The cold working die steel Cr8 of the present invention has the advantages of high hardness, high wear resistance, high hardenability and good toughness, can avoid brittle cracks caused by poor toughness, and has the advantage of low price. The production method has the advantages of simpler process and less time-consuming.

Description

technical field [0001] The invention relates to a cold working die steel Cr8 and a production method thereof. It belongs to the technical field of iron and steel materials. Background technique [0002] At present, the commonly used grades of traditional high-carbon and high-chromium cold work die steel are Cr12 and Cr12MoV. The chemical composition (mass fraction) of Cr12 is as follows: C: 2.00~2.30%, Si≤0.40%, Mn≤0.40%, P≤0.030%, S≤0.030%, Cr: 11.5~13.00%, and the balance is iron, which is characterized by high hardness, strength and wear resistance due to high carbon and high chromium content, suitable for manufacturing high wear resistance, micro deformation, high load The cold working die under service conditions also has disadvantages. The carbon content of Cr12 steel is more than 2%, and the eutectic carbide is severely heterogeneous, which makes the die impact toughness poor and easy to be brittle. In order to avoid the disadvantage of poor toughness, Cr12MoV steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/16C22C33/06
Inventor 何健宏王世金
Owner 广东金型重工有限公司
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