Anti-HIC (hydrogen induce crackle) hot rolled steel plate and magnesium processing smelting method thereof

Abstract

The invention discloses an anti-HIC (hydrogen induce crackle) hot rolled steel plate and a magnesium processing smelting method thereof. The hot rolled steel plate prepared by adopting the magnesium processing and smelting method comprises the following chemical components in percentage by weight: 0.06wt%-0.20wt% of C, 0.10 wt%-0.50 wt% of Si, 0.4 wt%-1.6 wt% of Mn, not greater than 0.25 wt% of P, not greater than 0.010wt% of S, not greater than 0.06 wt% of Nb, not greater than 0.15 wt% of V, 0.0001 wt%-0.020 wt% of Mg and Ti, less than 0.010 wt% of Als, and the balance of Fe and inevitable impurities. The anti-HIC hot rolled steel plate can inhibit production of banded structures in a steel plate, and can improve performance of the steel plate.

Description

Technical field [0001] The invention relates to the technical field of hot-rolled steel sheet production, in particular to a HIC-resistant hot-rolled steel sheet and a magnesium treatment smelting method. Background technique [0002] In recent years, the rate of accidents such as corrosion of pressure vessels and pipelines, hydrogen-induced cracking (HIC), and hydrogen sulfide stress corrosion cracking (SSCC) caused by wet hydrogen sulfide environment has been increasing. The wet hydrogen sulfide environment has caused equipment damage. The loss is huge, and it is also one of the most prominent corrosion problems and technical problems in the current oil extraction, refining, chemical, and gas production. [0003] Depending on the nature of the steel, the environment and other variables, the absorption of hydrogen produced by steel corrosion in a wet hydrogen sulfide environment will have different effects. One detrimental effect observed in pressure pipes is the development of c...

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Problems solved by technology

[0007] (2) Manganese and silicon: the segregation of Mn is easy to produce martensite and bainite microstructure with high strength and low toughness in the weld and heat affected zone, showing extremely high hardness and increasing the microstructure cracking after welding tendency

However, it only meets the conditions in terms of composition and does not improve defects such as uneven or even banded structures in the organization, or there is still a lack of economical and effective means for such organizational defects that affect the anti-HIC performance with the existing production technology. The ability to be improved is a restrictive link that restricts the current domestic production of high-quality HIC-resistant hot-rolled steel sheets

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