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High-strength superhigh-carbon steel and its production process

A technology of ultra-high carbon steel and production process, which is applied in the field of high-strength ultra-high carbon steel and its production process, and can solve problems such as low productivity, application range and production scale limitation

Inactive Publication Date: 2003-05-14
CHINA BAOWU STEEL GRP CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The process route is significantly simplified than before, but it needs to use isothermal forging equipment, and the productivity is low, so it is still limited in the scope of application and production scale

Method used

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  • High-strength superhigh-carbon steel and its production process
  • High-strength superhigh-carbon steel and its production process
  • High-strength superhigh-carbon steel and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] 1. Alloy composition (results of chemical analysis): 1.24C-2.55Si-1.55Cr-0.62Mn-Fe (wt%)

[0104] 2. Spray forming

[0105] The specific parameters are: 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 distance between the atomizer and the substrate The distance is 360mm, the substrate rotation speed is 10rpm; the gas / melt flow ratio (G / M) is about 0.30M 3 / kg.

[0106] Strip specimens of 16 mm thickness were prepared from spray-formed blanks, with the front end wedge-shaped to facilitate bite during rolling.

[0107] 3. Hot rolling

[0108] The above-mentioned samples were respectively placed in a furnace preheated to 820°C and 850°C for 35 minutes.

[0109] After taking out the sample, it is immediately sent to a hot rolling mill with a maximum rolling force of 3000KN for rolling. From the time the sample is take...

Embodiment 2

[0118] 1. Alloy composition (results of chemical analysis): 1.78C-1.46Al-1.61Cr-0.52Mn-Fe (wt%)

[0119] 2. Injection forming, the specific parameters are the same as in Example 1.

[0120] Strip specimens of 16 mm thickness were prepared from spray-formed blanks, with the front end wedge-shaped to facilitate bite during rolling.

[0121] 3. Hot rolling

[0122] Put the above-mentioned samples into the furnaces preheated to 910°C and 970°C respectively for 35 minutes.

[0123] After taking out the sample, it is immediately sent to a hot rolling mill with a maximum rolling force of 3000KN for rolling. From the time the sample is taken out to the start of rolling, the temperature of the sample drops by 70°C to 90°C (measured by an infrared temperature tester).

[0124] Rolling mill condition is the same as embodiment 1.

[0125] One sample was heated at 910°C and 970°C, and rolled from 16mm to 4.8mm in one pass, the reduction was 70%, and the rolling rate was ~7 / s.

[0126]...

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Abstract

The high-strength superhigh-carbon steel has the alloy components including C 1.0-2.0 wt%, Cr 0.5-2.0 wt%, Mn 0.2-0.8 wt%, Si or Al and Fe (the balance). The production process includes selection of proper additive elements, spray moulding to obtain blank; great deformation amount hot rolling, and cooling to obtain material with about 1000 MPa yield strength, about 1300 MPa tensile strength and 8-11 % percentage elongation and no need of quenching and tempering. The spray molded blank has fine structure and excellent high temperature deformation capacity and this makes it possible to perform great deformation amount hot rolling to result in high-strength superhigh-carbon steel with compact and fine structure. The process is simple, efficient, and has low power consumption and low production cost.

Description

technical field [0001] The invention relates to a high-strength ultra-high carbon steel and a production process thereof. Background technique [0002] As the most important structural material, iron and steel materials have always been an urgent requirement for market applications to improve their strength. The strength level (tensile strength) of general carbon steel can reach up to about 600MPa, and that of low alloy steel can reach about 800MPa; the strength can be increased to 1000MPa by adding special elements such as Nb and V and using special techniques such as controlled rolling. about. In order to obtain higher strength steel materials, in addition to increasing the degree of alloying (which will undoubtedly increase the cost), it mainly depends on quenching and tempering treatment. However, quenching and tempering treatment has well-known limitations such as high energy consumption and high production costs, and difficult control of product quality. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/115C22C38/18C22C38/34
Inventor 史海生林一坚章靖国姚锦声孙德生乐海荣苏竞高
Owner CHINA BAOWU STEEL GRP CORP LTD
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