Low-alloy SA622 GrB steel plate and production method thereof

• Main Authors: YIN WEIJIANG, LI JINGFENG, ZHAO GUOCHANG, LONG JIE, WANG TIANTIAN, DENG JIANJUN, LI JIANCHAO, PANG HUIYONG, DING WENKE
• Format: Patent
• Language: Chinese; English
• Published: 29.10.2019
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The present invention discloses a low-alloy SA622 GrB steel plate and a production method thereof; the chemical composition and mass percentage content of the steel plate meets the following requirements: C: 0.15-0.18%; Si: 0.30-0.40%; Mn: 1.00-1.50%; P is not greater than 0.007%, and S is not greater than 0.005%; the balance is Fe and inevitable impurities; the production method includes the following steps: steelmaking, rolling and slow cooling, and thermal treatment. In the present invention, by optimizing and accurately controlling components, the performance of the produced steel plate iscompletely superior to standard requirements, and the strength and toughness of the steel plate is well matched; and the performance of the produced steel plate meets the requirements: tensile strength Rm: 480-585MPa; yield strength Rel: no less than 290MPa; elongation A: no less than 23%; average impact value at 20 degrees centigrade: no less than 60J, and HB: no greater than 200. 本发明公开了一种低合金SA622GrB钢板及生产方法，钢板化学成分组成及质量百