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Forging method of high-carbon high-chromium steel forge piece and forge piece

A technology of high-carbon high-chromium steel and high-chromium steel, which is applied in the forging field of high-carbon high-chromium steel forgings and high-carbon high-chromium steel forgings. Effect of reducing fatigue strength and improving toughness

Pending Publication Date: 2022-03-22
扬州志程机械锻造有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the size of high-carbon and high-chromium cold-work die steel forgings has increased to Φ300mm~Φ700mm. With the increase of forging size, only larger steel ingots and large forging processing ratio can be used.
However, the carbide segregation in the as-cast structure of large steel ingots is more serious, and the probability of internal cracks and surface crack defects in the forging process is greatly increased when the forging process is large.

Method used

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  • Forging method of high-carbon high-chromium steel forge piece and forge piece
  • Forging method of high-carbon high-chromium steel forge piece and forge piece
  • Forging method of high-carbon high-chromium steel forge piece and forge piece

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Embodiment 1

[0031] The present invention provides such figure 1 A forging method of a high-carbon high-chromium steel forging shown, comprising the steps of:

[0032] S1: First calculate the external dimensions of high chromium steel forgings;

[0033] S2: Heating and preheating the forging to obtain a dense austenite structure;

[0034] S3: The austenite structure obtained in step S2 is subjected to an isothermal salt bath, then isothermally and finally quenched to obtain a mixed structure dominated by bainite and martensite, the following bainite and martensite A small amount of retained austenite and carbides are contained in the mixed structure dominated by austenite;

[0035] S4: Initial forging, the temperature is set at 1060-1090°C, and the heat preservation treatment is 10-20min;

[0036] S5: Cooling, so that the surface temperature of the billet drops to 720-780°C, and the core remains at a high temperature. While maintaining cooling, when the temperature difference between th...

Embodiment 2

[0046] The column 1 contains the following components: by weight: 6 parts of carbon (C), 4 parts of manganese (Mn), 18 parts of silicon (Si), 18 parts of chromium (Cr) The content of nickel (Ni) is 10 parts, the content of nickel (Ni) is 18 parts, the content of sulfur (S) is less than 2 parts, and the content of phosphorus (P) is less than 1 part.

Embodiment 3

[0048] The column 1 contains the following components: by weight: 8 parts of carbon (C), 5 parts of manganese (Mn), 25 parts of silicon (Si), 25 parts of chromium (Cr) The content of nickel (Ni) is 15 parts, the content of nickel (Ni) is 22 parts, the content of sulfur (S) is less than 3 parts, and the content of phosphorus (P) is less than 1.5 parts.

[0049] Table 1, when implementing according to embodiment 1-3, its formula composition draws the following table:

[0050]

[0051] At present, the domestic high-carbon and high-chromium type cold-work die steel forgings in the domestic market have a maximum size specification of only Φ250mm, and are delivered according to the GB / T1299-2000 alloy tool steel standard. The standard stipulates that for steel with a diameter greater than 120mm, the qualified level of eutectic carbide unevenness is generally not greater than 6 (or the agreement between the supplier and the buyer), and the quality level of the steel cannot meet th...

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Abstract

The invention discloses a forging method of a high-carbon high-chromium steel forge piece and the forge piece. The forging method comprises the following steps that S1, firstly, the external dimension of the high-chromium steel forge piece is calculated; s2, the forge piece is heated and preheated, and a compact austenite structure is obtained; s3, the austenite structure obtained in the step S2 is subjected to isothermal salt bath, isothermal treatment and quenching treatment, a mixed structure with bainite and martensite as main components is obtained, and the mixed structure with bainite and martensite as main components contains a small amount of retained austenite and carbide at the same time; s4, initial forging; s5, cooling; s6, the forged piece is placed in a lime box or dry sand to be slowly cooled and formed, and the influence of the unevenness of eutectic carbides in the structure on the quality of the high-carbon and high-chromium cold-work steel forged piece is effectively stabilized; the invention further discloses the high-carbon and high-chromium steel forge piece, the toughness of the high-carbon and high-chromium steel forge piece is improved to a certain extent, the fatigue strength of the high-carbon and high-chromium steel forge piece is reduced, and meanwhile the delayed fracture strength of the high-carbon and high-chromium steel forge piece is improved.

Description

technical field [0001] The invention relates to the technical field of forgings, in particular to a forging method for high-carbon and high-chromium steel forgings, and also to high-carbon and high-chromium steel forgings. Background technique [0002] Alloy steel die 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 that press and form metal materials at room temperature; there are many types of cold work dies , A wide range of applications, its output value accounts for about 1 / 3 of the total output value of the mold. According to the working conditions of the mold and the batch of products produced, the cold work die steel can be divided into: carbon tool steel T8~T12 with low hardenability, 9SiCr and CrWMn with high hardenability, and 6CrW2Si with high toughness etc., high-carbon high-chromium Cr12Mo1V1, Cr6WV ​​with high hardenability, high wear resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00B21J5/06B21J5/08B21J5/10B21J1/02B21J1/04B21J1/06C21D1/20C21D1/46
CPCB21J5/002B21J5/06B21J5/08B21J5/10B21J1/02B21J1/04B21J1/06C21D1/20C21D1/46C21D2211/002C21D2211/008
Inventor 刘志程
Owner 扬州志程机械锻造有限公司
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