Hydrogen sulfide corrosion preventing thin steel sheet subjected to long-time simulated post weld heat treatment and production method

Abstract

The invention discloses a hydrogen sulfide corrosion preventing thin steel sheet subjected to long-time simulated post weld heat treatment and a production method. The thin steel sheet comprises the chemical components of, by mass, 0.16%-0.19% of C, 0.20%-0.40% of Si, 1.15%-1.30% of Mn, no more than 0.010% of P, no more than 0.005% of S, 0.020%-0.050% of Al and the balance Fe and inevitable impurities. The production method comprises the heating, rolling and heat treatment processes. The rolling process adopts a two-stage rolling technique, and the heat treatment process adopts a quenching andtempering technique. C and Mn solid solution strengthening is adopted; the steel sheet is high in density and strength grade, excellent in -30 DEG C low-temperature impact toughness, moderate in hardness and excellent in hydrogen sulfide corrosion preventing performance, the requirement for hydrogen sulfide corrosion preventing steel, subjected to long-time simulated post weld heat treatment, fora pressure vessel can be met, and good comprehensive performance and welding performance are achieved; the number of banded structures is 0; and the thickness specification of the thin steel sheet is8-20 mm.

Description

Technical field [0001] The invention belongs to the field of metallurgical technology, and specifically relates to a hydrogen sulfide corrosion-resistant thin steel sheet subjected to long-term die welding heat treatment and a production method. Background technique [0002] In recent years, with the rapid development of the national economy, the demand for hydrogen sulfide corrosion-resistant pressure vessel thin steel plates that require long-term simulation of post-weld heat treatment has become increasingly prominent, and the market demand is increasing. At the same time, due to the serious band structure of thin steel plates Affects the resistance to hydrogen sulfide corrosion. For a long time, due to the lack of necessary production equipment and technical support, there is no mature experience in the production of hydrogen sulfide corrosion resistant pressure vessel thin steel plates that require long-term simulation of post-weld heat treatment. At present, air cooling afte...

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Problems solved by technology

[0002] In recent years, with the rapid development of national economic construction, the demand for thin steel plates for hydrogen sulfide corrosion-resistant pressure vessels that require long-term simulated post-weld heat treatment has become increasingly prominent, and the market demand is increasing. Affect the anti-hydrogen sulfide corrosion performance. Due to the lack of necessary production equipment and technical support for a long time, there is no mature experience in the production of thin steel plates for hydrogen sulfide corrosion-resistant pressure vessels that require long-term simulated post-weld heat treatment. At present, air cooling after normalizing is generally used. , The process of fog cooling after normalizing or water cooling after normalizing, the air cooling process after normalizing is beneficial to the uniform structure of the steel plate, but it is difficult to meet the requirements for the strength of the steel plate after the long-term simulated post-weld heat treatment of the sample, and the fog cooling after normalizing Although the process can improve the banded structure of the steel plate to a certain extent, the effect of improving the strength of the steel plate after the long-term simulated post-weld heat treatment of the sample is not obvious. The water-cooled process after normalizing does not have tempering treatment, and the surface of the steel plate may be due to The cooling rate is too fast to produce martensite or bainite structure, resulting in high surface hardness of the steel plate, easy to break during the rolling process, resulting in the steel plate can not meet the needs of the domestic market, seriously restricting the development of China's national economic construction

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