Non-quenching high-toughness cold-working die steel and production process

A technology with high strength and toughness and production process, applied in the field of metallurgical manufacturing, can solve the problems of easy generation of reticulated carbides, affect performance, and high manufacturing costs, and achieve significant economic benefits, low manufacturing costs, and reasonable ratios.

Inactive Publication Date: 2010-05-26
SHANDONG YUANDA MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of non-quenching high-strength toughness cold working tool steel and production technology, to solve the problem that the conten

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment one is used for cold shearing blade

[0046] 9CrSi is a commonly used cold working die steel. The cold shear blade made of this steel, the original mold processing process is: smelting→forging→spheroidizing annealing→rough turning→finishing→quenching and tempering→grinding→aging→fine grinding . The final heat treatment is heating and quenching at 870°C and tempering at 200°C. Cold shear blades often fail early due to crushing, chipping or peeling off during use, and their service life is short. Change it to non-quenched high-strength toughness cold work die steel. After forging, it will be normalized at 900°C, and after tempering at 300°C, its hardness will be 3-5HRC higher than the conventional one, but the fracture toughness will be K IC Improve nearly 20%. The application on the 600t bar shearing machine shows that the normalized and low-temperature tempered blade cuts scrap steel 15467t / pair on average, and the conventional annealing blade cuts scrap st...

Embodiment 2

[0081] Embodiment two is used for cold extrusion die

[0082] The spinning die of a factory is made of Cr12MoV. The processing flow of the original mold is: smelting→forging→spheroidizing annealing→rough turning→finishing→quenching and tempering→grinding→aging→fine grinding. The hardness of the mold is HRC52-55, and the life span is only a few hundred pieces, all of which fail due to brittle cracking. Switch to non-quenched high-strength toughness cold work die steel after forging and normalizing at 850°C, and after tempering at 250°C at low temperature, its hardness is 3-5HRC higher than that of Cr12MoV, but the fracture toughness is K IC The toughness of the mold is increased by nearly 20%, and the final hardness of the mold is HRC, which further reduces its brittleness. The life of the mold is increased to more than 2,000 rolling pieces, reaching the level of imported molds. The specific material composition and manufacturing process parameters are as follows:

[0083] 1...

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PUM

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Abstract

The invention relates to a non-quenching high-toughness cold-working die steel belonging to the technical field of metallurgical manufacture. The novel cold-working die steel is developed by optimizing and creating a product component formula, adding alloy elements, rolled and cold thinned texture and adopting the processes of remelting and fining electroslag in an electric furnace, forging many times in a great forging proportion and special heat treatment. The manufacture process comprises the following flows: selecting a chemical component range; drawing an ingredient scheme according to the chemical component range; melting at an intermediate frequency; remelting (refining) the electroslag; annealing; discharging; extending hydrogen; forging; normalizing; tempering; mechanically processing; and detecting. The important manufacture process comprises the steps: (1) refining; (2) forging; (3) extending hydrogen; and (4) normalizing; and tempering so as to obtain non-quenching high-toughness cold-working die steel. The invention has reasonable chemical component proportion, low manufacture cost, good alloying effect, great forging transformer ratio, favorable density of metal structure and high toughness performance index. Various performance indexes of the product reach or exceed the levels of similar international and national products.

Description

technical field [0001] The invention belongs to the field of metallurgical manufacturing technology. Background technique [0002] In recent years, with the rapid development of the mold industry, a huge market has been provided for domestic mold steel, which has driven the improvement of the output, variety, specification and quality level of domestic mold steel. my country's metallurgical industry has developed and introduced a large number of steel types required by the mold industry, but domestic mold steel is still difficult to fully meet the needs of the domestic mold market in terms of variety and quality. At present, there are only a few grades of cold-work die steel in China, such as Cr12, Cr12MoV, CrWMn, 9CrSi, and T10. [0003] Due to the high alloying elements C, Cr, Mo, V and carbon content of the current cold work die steel, the manufacturing cost is high, and serious network carbides are prone to occur, which affects the performance. For example, the composi...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C33/04C22B9/18C21D3/06C21D1/18C21D1/28B21J5/00
Inventor 曹衍学
Owner SHANDONG YUANDA MATERIAL TECH CO LTD
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