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C-grade steel and heat treatment method thereof

A heat treatment method and weight fraction technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems such as unstable mechanical properties and affecting the service life of C-grade steel, and achieve the effect of stable low-temperature impact value

Inactive Publication Date: 2020-06-26
四川省洪发车辆配件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

C-grade steel has extremely strict requirements on its tensile strength, yield strength, elongation after fracture, reduction of area, hardness, and low-temperature impact value during use. , the mechanical properties of the products obtained under heat treatment are unstable, thus affecting the service life of C-grade steel

Method used

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  • C-grade steel and heat treatment method thereof
  • C-grade steel and heat treatment method thereof
  • C-grade steel and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] see figure 1 , including the following components by weight fraction: 0.26 parts of C, 0.39 parts of Si, 0.87 parts of Mn, 0.016 parts of P, 0.016 parts of S, 0.049 parts of Cu, 0.48 parts of Cr, and 0.14 parts of Mo.

[0021] The heat treatment method of the above grade C steel comprises the following steps:

[0022] a. Raise the temperature of Grade C steel to 870-900°C with the furnace at a rate of ≤150°C per hour, Fog cold.

[0023] b. Heat the grade C steel cooled to below 300°C to 630-660°C, hold the temperature for ≥3 hours, and cool in air.

[0024] As a preferred method, in steps a and b, the heating rate above 300°C is ≤150°C / h, and the heating rate is not limited within 300°C.

[0025] Specifically, the maximum wall thickness of the casting is 90mm.

[0026] In this example, C made of 0.26 parts of C, 0.39 parts of Si, 0.87 parts of Mn, 0.016 parts of P, 0.016 parts of S, 0.049 parts of Cu, 0.48 parts of Cr, and 0.14 parts of Mo In the heat treatment ...

Embodiment 2

[0033] see figure 1 , including the following components by weight fraction: 0.27 parts of C, 0.4 parts of Si, 0.86 parts of Mn, 0.018 parts of P, 0.017 parts of S, 0.044 parts of Cu, 0.46 parts of Cr, and 0.15 parts of Mo.

[0034] The heat treatment method of the above grade C steel comprises the following steps:

[0035] a. Raise the temperature of Grade C steel to 870-900°C with the furnace at a rate of ≤150°C per hour, Fog cold.

[0036] b. Heat the grade C steel cooled to below 300°C to 630-660°C, hold the temperature for ≥3 hours, and cool in air.

[0037] As a preferred method, in steps a and b, the heating rate above 300°C is ≤150°C / h, and the heating rate is not limited within 300°C.

[0038] Specifically, the maximum wall thickness of the casting is 90mm.

[0039] In this example, C made of 0.27 parts of C, 0.4 parts of Si, 0.86 parts of Mn, 0.018 parts of P, 0.017 parts of S, 0.044 parts of Cu, 0.46 parts of Cr, and 0.15 parts of Mo In the heat treatment pr...

Embodiment 3

[0047] see figure 1 , including the following components by weight fraction: 0.28 parts of C, 0.37 parts of Si, 0.84 parts of Mn, 0.017 parts of P, 0.018 parts of S, 0.053 parts of Cu, 0.48 parts of Cr, and 0.15 parts of Mo.

[0048] The heat treatment method of the above grade C steel comprises the following steps:

[0049] a. Raise the temperature of Grade C steel to 870-900°C with the furnace at a rate of ≤150°C per hour, Fog cold.

[0050] b. Heat the grade C steel cooled to below 300°C to 630-660°C, hold the temperature for ≥3 hours, and cool in air.

[0051] As a preferred method, in steps a and b, the heating rate above 300°C is ≤150°C / h, and the heating rate is not limited within 300°C.

[0052] Specifically, the maximum wall thickness of the casting is 90mm.

[0053] In this example, C made of 0.28 parts of C, 0.37 parts of Si, 0.84 parts of Mn, 0.017 parts of P, 0.018 parts of S, 0.053 parts of Cu, 0.48 parts of Cr, and 0.15 parts of Mo In the heat treatment pr...

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Abstract

The invention relates to the field of steel production processes, and discloses a C-grade steel. The C-grade steel comprises the following ingredients by weight fraction: 0.24 to 0.32 part of C, 0.3 to 0.5 part of Si, 0.8 to 1 part of Mn, 0 to 0.03 part of P, 0 to 0.03 part of S, 0 to 0.2 part of Cu, 0.4 to 0.6 part of Cr and 0.1 to 0.2 part of Mo. According to the C-grade steel provided by the invention, stable product mechanical performance is obtained under a reasonable heat treatment process by strictly controlling chemical compositions.

Description

technical field [0001] The invention relates to the field of steel production technology, in particular to a C-grade steel and a heat treatment method thereof. Background technique [0002] C-grade steel generally refers to the steel whose mechanical properties and chemical composition meet the American Association of Railroads (A.A.R.) AAR-M-201 and AAR-M-211C grade steel standards. Since 1962, all the couplers of the AAR-approved freight trains in the United States are made of C-grade steel. To meet the needs of high-speed and heavy-duty railway transportation, C-grade steel is gradually replacing the traditionally used ordinary carbon cast steel and has become the leading material for railway freight car couplers in my country. C-grade steel has extremely strict requirements on its tensile strength, yield strength, elongation after fracture, reduction of area, hardness, and low-temperature impact value during use. , The mechanical properties of the products obtained und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/20C22C38/22C21D6/00C21D11/00
CPCC21D6/002C21D6/005C21D6/008C21D11/00C22C38/02C22C38/04C22C38/20C22C38/22
Inventor 张群刘颇柏在胜
Owner 四川省洪发车辆配件有限公司
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