Large steel casting of G17CrMo9-10 material and production method thereof

A production method and technology for steel castings, which are applied to large steel castings and their production fields, can solve the problems of tonnage, large wall thickness, unstable mechanical properties, and excessive hardness control deviation of the body, and achieve improved strength and excellent performance. , the effect of improving hardenability

Active Publication Date: 2017-05-10
KOCEL STEEL
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Problems solved by technology

However, as a large steel casting, due to the large tonnage and wall thickness of the casting, the material has problems of unstable mec

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  • Large steel casting of G17CrMo9-10 material and production method thereof

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[0018] The embodiment of the present invention provides a large-scale steel casting of G17CrMo9-10 material. The chemical composition of the large-scale steel casting of G17CrMo9-10 material is C: 0.13 to 0.20%, Si ≤ 0.60%, and Mn: 0.50 to 0.90 %, S≤0.020%, P≤0.020%, Cr: 2.00~2.50%, Mo: 0.9~1.20%, Ni: 0.2~0.4%, V <0.05%, Cu <0.3%, the balance is iron.

[0019] Further, the chemical composition of the large-scale steel castings of the G17CrMo9-10 material is C: 0.16~0.19%, Si: 0.30~0.50%, Mn: 0.60~0.85%, S≤0.015%, P≤0.019%, Cr : 2.15~2.45%, Mo: 0.92~1.10%, Ni: 0.2~0.4%, V <0.05%, Cu <0.3%, the balance is iron.

[0020] The invention adds Ni element to the conventional low-alloy steel castings, thereby greatly improving the strength of the castings, and when the steel castings are quenched during the preparation process, the addition of Ni can improve the hardenability of the castings , Which makes the performance of the castings after quenching excellent.

[0021] The present invent...

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Abstract

The invention provides a large steel casting of a G17CrMo9-10 material and a production method thereof. The production method comprises the steps of furnace feeding, quenching, tempering, casting defect detection and repair welding, stress relief after process welding and stress relief after final welding. As Ni element is added in a conventional low-alloy material steel casting, the strength of the casting is largely increased; and when the steel casting is quenched in the preparation process, the Ni element is added to improve the casting hardenability, so that the quenched casting is excellent in performance.

Description

technical field [0001] The invention relates to the technical field of steel casting production, in particular to a large steel casting made of G17CrMo9-10 material and a production method thereof. Background technique [0002] G17CrMo9-10 material is a low-alloy material, which is mainly used in gas turbines, the main type of power generation equipment, and currently has broad market prospects. However, as a large steel casting, due to the large tonnage and wall thickness of the casting, the material has problems of unstable mechanical properties and excessive hardness control deviation during the production process, which need to be resolved as soon as possible. Contents of the invention [0003] It is necessary to propose a large steel casting of G17CrMo9-10 material with high strength, high hardness and excellent comprehensive performance. [0004] It is also necessary to propose a production method for large steel castings of G17CrMo9-10 material. [0005] A large s...

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/12C22C38/08C22C38/16C21D1/18C21D1/30
CPCC21D1/18C21D1/30C22C38/02C22C38/04C22C38/08C22C38/12C22C38/16C22C38/18
Inventor 杨爱宁冯周荣李少雨
Owner KOCEL STEEL
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