Q370R steel plate with excellent wet hydrogen sulfide corrosion resistance and manufacturing method thereof

• Main Authors: LIU HAIKUAN, ZHOU PEIRONG, ZHANG JIAN, MIAO PIFENG, YE JIANJUN, YUN PENGCHENG, YU XINYUN, BAI YUN
• Format: Patent
• Language: Chinese; English
• Published: 10.08.2021
• 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 invention relates to a Q370R steel plate with excellent wet hydrogen sulfide corrosion resistance. The Q370R steel plate comprises the following chemical components of, in percentage by weight, 0.12-0.18% of C, 0.40-0.50% of Si, 1.20-1.35% of Mn, less than or equal to 0.005% of P, less than or equal to 0.0006% of S, 0.15-0.30% of Ni, 0.15-0.30% of Cu, 0.01-0.05% of Nb, 0.01-0.05% of V, 0.01-0.05% of Ti, 0.02-0.05% of Alt and the balance Fe and inevitable impurity elements, the carbon equivalent Ceq is less than or equal to 0.45%, and the calculation formula is Ceq = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15. A manufacturing method of the steel plate sequentially comprises the main steps of smelting and casting, continuous casting billet heating, rolling and heat treatment according to the production sequence. According to the Q370R steel plate with the excellent wet hydrogen sulfide corrosion resistance, under the 580 +/-10 DEG C * 8 h simulated postweld heat treatment condition, the allowance of the yiel