Non-tempered superhigh carbon steel production

A technology of ultra-high carbon steel and production process, applied in the field of production technology of non-quenched and tempered ultra-high carbon steel, can solve problems such as high cost, and achieve the effect of good ductility and toughness

Inactive Publication Date: 2005-05-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] In view of the existing situation, in order to change the phenomenon of high energy consumption and high cost, the purpose of the present invention is to provide a production process of non-quenched and tempered ultra-high carbon steel, the non-quenched and tempered ultra-high carbon steel obtained by the process has high strength, high Toughness; also has the characteristics of simple process, low energy consumption and low manufacturing cost

Method used

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  • Non-tempered superhigh carbon steel production
  • Non-tempered superhigh carbon steel production
  • Non-tempered superhigh carbon steel production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] (1) Alloy composition (chemical analysis results):

[0062] See Table 2;

[0063] (2) Spray forming process

[0064] The specific parameters of the spray forming process: Put the master alloy material into the crucible to melt, the superheat of the melt is about 150°C; the inner diameter of the catheter is 4mm; the pressure of the atomizing gas (nitrogen) is 2.2MPa, the atomization The distance between the device and the substrate is 360mm, the rotation speed of the substrate is 10rpm; the gas / melt flow ratio (G / M) is about 0.30M 3 / kg.

[0065] (3) Isothermal forging

[0066] The billet is taken out after being heated to 850°C for 30 minutes in the furnace; then put into the flat mold of the isothermal forging press that has reached the heat balance of 850°C; after reaching the heat balance again (about 2 minutes), carry out isothermal forging and press 80 tons, which remains unchanged throughout the isothermal forging process; the initial pressure is 185MPa per sq...

Embodiment 2

[0068] (1) Alloy composition (chemical analysis results)

[0069] See Table 2;

[0070] (2) Spray forming process

[0071] Concrete parameters of spray forming process: with embodiment 1

[0072] (3) Isothermal forging

[0073] The billet is taken out after being heated to 870°C for 30 minutes in the furnace; then put into the flat mold of the isothermal forging press that has reached the heat balance of 870°C; after reaching the heat balance again (about 2 minutes), carry out isothermal forging and press 80 tons, which remains unchanged throughout the isothermal forging process; the initial pressure is 200MPa per square centimeter (calculated according to the force-bearing area of ​​the blank), and the strain rate at the initial compression is 6 to 8×10 -3 / S. As the amount of deformation increases, the force area increases, the pressure decreases, and the rate becomes slower. Press from 24mm to 7mm in 15 minutes, the total deformation is 71%, stop forging, the blank is ...

Embodiment 3

[0075] (1) Alloy composition (chemical analysis results)

[0076] See Table 2;

[0077] (2) Injection forming

[0078] Concrete process is with embodiment 1;

[0079] (3) Isothermal forging

[0080] The billet is taken out after being heated to 830°C for 30 minutes in the furnace, and then put into the flat mold of the isothermal forging press that has reached the heat balance of 830°C. After reaching the heat balance again (about 2 minutes), carry out isothermal forging and press 96 tons remain unchanged throughout the isothermal forging process, the initial pressure is 210MPa per square centimeter (calculated according to the force-bearing area of ​​the billet), and the strain rate at the initial compression is 6 to 8×10 -3 / S. As the amount of deformation increases, the force area increases, the pressure decreases, and the rate becomes slower. Press from 23mm to 7mm in 15 minutes, the total deformation is 69%; stop forging, the blank is taken out and air-cooled.

[00...

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Abstract

The invention provides a production process of non-quenched and tempered ultra-high carbon steel. The weight percentages of the alloy components of the involved non-quenched and tempered ultra-high carbon steel are C: 1.0-1.8, Si: 0.5-3.5, Cr: 0.5-2.0 , Mn: 0.2-0.7, excess Fe; the billet is obtained by spray forming process, and then the spray-formed billet is subjected to isothermal forging, isothermal forging temperature: 790 ° C ~ 910 ° C; isothermal forging rate: 1 × 10 -4 / s~1×10 -2 / s; forging deformation: 50% to 80%. The strength of the non-quenched and tempered ultra-high carbon steel obtained by the invention exceeds that of the high-grade non-quenched and tempered steel on the market, and still has quite good ductility and toughness. The process of the invention is not only simple, but also greatly reduces energy consumption and manufacturing cost.

Description

technical field [0001] The invention relates to a production process of non-quenched and tempered ultra-high carbon steel. Background technique [0002] As the most important structural material, steel has been developing towards higher strength levels. Quenching and tempering treatment is a well-known effective process for improving the strength of steel. However, quenching and tempering treatment also has its serious limitations: the consumption of equipment and energy increases production costs and environmental pollution; the deformation or cracking that is prone to occur during the quenching process increases the scrap rate; Problems such as inconsistent performance limit the size of the workpiece. Therefore, the development of non-quenched and tempered steel has become a very important development direction of the steel industry. At present, the upper limit of the strength level (tensile strength) of ferritic-pearlite non-quenched and tempered steel widely used in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/00C22C38/18C22C38/34C22C38/36
Inventor 林一坚史海生章靖国姚锦声孙德生韩肃孙大乐樊俊飞
Owner BAOSHAN IRON & STEEL CO LTD
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