低焊接裂纹敏感性抗高温回火厚板及其生产方法

High-temperature resistant tempered heavy plate with low susceptibility to welding crack and production method thereof

Abstract

本发明公开了一种低焊接裂纹敏感性抗高温回火厚板及其生产方法,厚板化学成分的重量百分比为:C 0.08%~0.11%、Si 0.15%~0.40%、Mn1.20%~1.75%、P≤0.020%、S≤0.006%、Ni 0.20%~0.45%、Cr 0.15%~0.30%、Mo 0.20%~0.40%、Cu 0.10%~0.30%、V 0.03%~0.06%、Nb 0.04%~0.06%,Als0.025%~0.035%,Ti 0.015%~0.025%,余量为Fe及不可避免杂质,化学成分满足:P<sub>cm</sub>=C+Si/30+Ni/60+(Mn+Cr+Cu)/20+Mo/15+V/10+5B≤0.26%。采用奥氏体完全再结晶区+奥氏体未再结晶区二个阶段控制轧制工艺、在线强制冷却、回火处理生产工艺,母材钢板在680℃回火仍保持组织和性能的稳定,抗拉强度在780MPa以上。
The invention discloses a high-temperature resistant tempered heavy plate with low susceptibility to welding crack and a production method thereof. The heavy plate comprises the following chemical compositions in percentage by weight: 0.08 to 0.11 percent of C, 0.15 to 0.40 percent of Si, 1.20 to 1.75 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.006 percent of S, 0.20 to 0.45 percent of Ni, 0.15 to 0.30 percent of Cr, 0.20 to 0.40 percent of Mo, 0.10 to 0.30 percent of Cu, 0.03 to 0.06 percent of V, 0.04 to 0.06 percent of Nb, 0.025 to 0.035 percent of Als,0.015 to 0.025 percent of Ti and the balance of iron and inevitable impurities; and the chemical compositions meet a condition that: P cm is equal to C+Si/30+Ni/60+(Mn+Cr+Cu)/20+Mo/15+V/10+5B and is less than or equal to 0.26 percent. A production process for controlling a rolling process in two stages of an austenite complete recrystallization region and an austenite non-recrystallization region,forcedly cooling on line and tempering is adopted, a parent metal steel plate is tempered at 680DEG C, can still maintain the stability of textures and performance, and has the tensile strength above780MPa.

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Cited By (9)

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