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A flange forging made of hydrogen-resistant steel and its production process

A flange forging and production process technology, applied in the field of metal forging, can solve the problems of increasing material brittleness, loss, and lack of comprehensive understanding of performance, and achieve the effect of improving hydrogen resistance and purity

Active Publication Date: 2018-11-23
无锡市法兰锻造有限公司
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AI Technical Summary

Problems solved by technology

Hydrogen-resistant steel is the abbreviation of hydrogen-induced cracking-resistant steel. Hydrogen-induced cracking (HIC) exists in forgings as a defect. There is no comprehensive understanding of its impact on performance. However, a large number of studies have shown that hydrogen-induced cracking has The strength index of the material has little effect, but it has a relatively large impact on the toughness index, which will increase the brittle tendency of the material. This defect has caused many accidents and serious losses to countries all over the world.

Method used

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  • A flange forging made of hydrogen-resistant steel and its production process
  • A flange forging made of hydrogen-resistant steel and its production process
  • A flange forging made of hydrogen-resistant steel and its production process

Examples

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Embodiment example 1

[0013] Implementation case 1: The forgings and flanges produced by using the chemical composition of the above ratio and the production process can successfully pass the HIC test. Taking the most commonly used 16Mn (HIC) hydrogen-resistant steel as an example, the specific experiment is as follows:

[0014] Table 1 is the conventional 16Mn material, and Table 2 is the chemical composition ratio of the steel with high hydrogen resistance provided by the present invention, and its ratio is as follows:

[0015] Table 1 Chemical composition of 16Mn % Melting furnace number: 3655665

[0016]

[0017] Table 2 Chemical composition of 16Mn (HIC) % Melting furnace number: 3655632

[0018]

[0019] The two test forgings are heat treated separately. The No. 1 test forging is subjected to quenching and tempering heat treatment according to the conventional requirements. The quenching heating temperature is 920°C±10°C, cooled in a liquid medium, and tempered at 650°C±10°C for 3 hours...

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Abstract

The invention provides a flange forge piece made of hydrogen-resistant steel and a production technique of the flange forge piece. The hydrogen-resistant steel comprises 0.13-0.20% of C, 0.20-0.60% of Si, 1.20-1.60% of Mn, 0-0.030% of P, 0-0.030% of S, 0-0.25% of Cr, 0-0.25% of Cu, and 0-0.25% of Ni. In the smelting process, an electroslag remelting method is adopted, and heat treatment is conducted with the quenching temperature being 935+ / -10 DEG C and the tempering temperature being 670+ / -10 DEG C. According to the flange forge piece made of the hydrogen-resistant steel, the proportions of P, S and Ni are decreased in the aspect of the chemical composition, in the smelting process, electroslag remelting is adopted, the material impurity is improved, in the heat treatment process, the normalizing technique and the tempering technique are adopted, the strength and the hardness are controlled to be close to the lower limit of the standard value, and the hydrogen resistance of the hydrogen-resistant steel is effectively improved.

Description

technical field [0001] The invention mainly relates to the field of metal forging, in particular to a flange forging made of hydrogen-resistant steel and a production process thereof. Background technique [0002] In recent years, with the continuous improvement of design standards and the continuous enhancement of people's safety awareness, the use of hydrogen-resistant steel is increasing in the petrochemical field and other equipment forgings that work in acidic environments. Hydrogen-resistant steel is the abbreviation of hydrogen-induced cracking-resistant steel. Hydrogen-induced cracking (HIC) exists in forgings as a defect. There is no comprehensive understanding of its impact on performance. However, a large number of studies have shown that hydrogen-induced cracking has The strength index of the material has little effect, but the impact on the toughness index is relatively large, which will increase the brittle tendency of the material. This defect has caused many ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/18C22C38/16C22C38/08C22C38/02C21D1/18
CPCC21D1/18C22C38/02C22C38/04C22C38/08C22C38/16C22C38/18
Inventor 许建平
Owner 无锡市法兰锻造有限公司
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