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Preparation method of steel 30CrMnSiNi2A for high-end structure

A kind of structural steel, high-end technology, applied in the field of high-end structural steel preparation, 30CrMnSiNi2A preparation, can solve the problem of inability to obtain performance, and achieve the effect of improving the flaw detection performance

Active Publication Date: 2022-08-02
SHANXI TAIGANG STAINLESS STEEL CO LTD
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AI Technical Summary

Problems solved by technology

30CrMnSiNi2A is an excellent high-end structural steel, but it is often impossible to obtain the best performance by using the existing process

Method used

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  • Preparation method of steel 30CrMnSiNi2A for high-end structure
  • Preparation method of steel 30CrMnSiNi2A for high-end structure
  • Preparation method of steel 30CrMnSiNi2A for high-end structure

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Effect test

Embodiment Construction

[0027] At present, customers have the following requirements for the high-end structure of 30CrMnSiNi2A

[0028] ① The flaw detection requirements meet the standard GB / T 4162-2008 grade B (φ2 equivalent level). For forged round steel delivered by polishing, it is affected by the surface finish, especially for large-size contracts (diameter > φ300mm) to meet the flaw detection requirements. , is more difficult;

[0029] ②To ensure good flaw detection performance, electroslag is used for rapid forging. Due to the high hardness of the material, the specification is forged from an 8.4-ton rectangular ingot into a circle, and the deformation is large.

[0030] ③ The cleanliness and density of steel are high. Since the user needs to extrude and perforate the raw material, higher requirements are placed on the purity and low-magnification structure of the material. Density requirements generally loose, center loose, segregation are all ≤ 1 grade.

[0031] ④ There are many inspectio...

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Abstract

The invention relates to the field of preparation of steel for high-end structures, in particular to the field of preparation of 30CrMnSiNi2A. The invention discloses a preparation method of steel 30CrMnSiNi2A for a high-end structure. The preparation method is carried out according to the technological process of EBT smelting, LF refining, VD vacuum treatment, mold injection of 5.6 t round ingots, electroslag, annealing, heating, fast forging, annealing, normalizing, finishing, inspection, judgment and warehouse delivery. Si is burnt out in the electroslag process, so that the Si smelted in the electric furnace is controlled at the middle upper limit; in order to prevent white spots, the VD high vacuum holding time is prolonged, and H is smaller than or equal to 2 ppm; in order to prevent silicon burning loss in the electroslag process, a slag system with the ratio of CaF2 to Al2O3 being 70: 30 is designed and selected, and aluminum powder is added into the slag to reduce unstable oxides in the slag.

Description

technical field [0001] The invention relates to the field of preparation of high-end structural steel, in particular to the field of preparation of 30CrMnSiNi2A. Background technique [0002] High-end structural steel refers to steel with high strength, large thickness, resistance to laminar tearing, large heat input welding, corrosion resistance, ultra-low temperature toughness, and high crack arrest performance. Its production process is strict and requires high equipment stability. High difficulty. [0003] In recent years, with the acceleration of my country's industrialization and rapid economic development, the demand for high-end structural steel has also increased rapidly, and user requirements have become increasingly stringent. It not only requires low magnification, tower-shaped hairline, fracture and other acid leaching inspection items, but also puts forward higher requirements for decarburization, non-metallic inclusions and grain size in high magnification st...

Claims

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Application Information

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IPC IPC(8): C22C33/06C21C7/00C21C7/10B22D7/00C22B9/18C21D1/26C21D1/28B21J5/00C21D6/00C22C38/02C22C38/04C22C38/42C22C38/06
CPCC22C33/06C21C7/0075C21C7/10B22D7/00C22B9/18C21D1/26C21D1/28B21J5/002C21D6/004C21D6/005C21D6/008C22C38/02C22C38/04C22C38/42C22C38/06Y02P10/20
Inventor 王会亮原凌云李建军
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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