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发明授权
CN108486466B 一种屈服强度550MPa级高韧性耐候钢板及其制备方法 有权

一种屈服强度550MPa级高韧性耐候钢板及其制备方法
摘要：
本发明公开了一种屈服强度550MPa级高韧性耐候钢板及其制备方法，包括如下化学成分及重量百分比：C：0.05～0.10％；Si：0.10％～0.40％；Mn：1.20～1.70％；P：≤0.012％；S：≤0.008％；Cr：0.40～0.80％；Ni：0.15～0.40％；Cu：0.25～0.40％；Als：0.015～0.040％；Nb：0.030～0.070％；Ti：0.010～0.040％；并且满足Pcm＝C+Si/30+(Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B≤0.20％；余量为Fe及不可避免的夹杂。根据本发明公开的方法得到的所述耐候钢板的显微组织为铁素体+粒状贝氏体+少量珠光体复相组织，其ReL为560～650MPa，Rm为680～780MPa，A为22.0％～26.0％，‑40℃纵向夏比V型冲击功KV2＞70J，并且具有优良的焊接性能、冷弯成形性能和耐大气腐蚀性能。
摘要（英）：

The invention discloses a high-toughness weather-resistant steel plate with the yield strength of 550MPa and a preparation method of the high-toughness weather-resistant steel plate. The high-toughness weather-resistant steel plate is prepared from the following chemical components by weight percent: 0.05 to 0.10 percent of C, 0.10 to 0.40 percent of Si, 1.20 to 1.70 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.008 percent of S, 0.40 to 0.80 percent of Cr, 0.15 to 0.40 percent of Ni, 0.25 to 0.40 percent of Cu, 0.015 to 0.040 percent of Als, 0.030 to 0.070 percent of Nb, and 0.010 to 0.040 percent of Ti, and the balance of Fe and unavoidable impurities, wherein Pcm is equal to C+Si/30+(Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B and less than or equal to 0.20 percent. The microscopic tissue of the weather-resistant steel plate obtained according to the method disclosed in the invention is composite-phase tissue of ferrite, granular bainite and little pearlite,the ReL is 560 to 650MPa, Rm is 680 to 780MPa, A is 22.0 to 26.0 percent, and the longitudinal Charpy V-type impact power KV2 is greater than 70J at the temperature of -40 DEG C, and the high-toughness weather-resistant steel plate has excellent welding performance, cold bending forming performance and atmospheric corrosion resistance.

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