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发明公开
CN102766808A 一种微合金化桥梁钢板及其正火轧制工艺 无效 - 撤回

一种微合金化桥梁钢板及其正火轧制工艺
摘要：
一种微合金化桥梁钢板及其正火轧制工艺，属于冶金技术领域，以重量百分比计其化学成分及含量为：C 0.15%-0.20%，Si 0.30%-0.45%，Mn 1.4%-1.8%， P≤0.015%，S≤0.008%，Nb 0.020-0.060%，V 0.020-0.060%,Ti 0.008-0.030%，Ni 0.15%-0.35%，Ce≤0.0010%，Alt≥0.02%，余量为Fe和不可避免的杂质。轧制工艺为：加热温度为1200-1250℃，加热时间≥200分钟，均热时间≥30分钟，正火轧制粗轧开轧温度为1190-1230℃，精轧开轧温度885-955℃，终轧温度835-875℃。本发明的突出优点是钢板采用正火轧制工艺成型，可生产厚度为40mm以下规格的钢板且具有优良的力学性能，其抗拉强度≥600MPa，屈服强度≥450MPa，延伸率≥20%，-40℃条件下纵向冲击功大于120J，碳当量不大于0.45%，焊接性能良好，生产成本低。热轧钢板不仅具有高强度和高塑性，而且屈强比和碳当量较低，抗震和焊接性能优异。
摘要（英）：

The invention relates to a microalloyed bridge steel plate and a normalizing rolling technology thereof, and belongs to the technical field of metallurgy. The microalloyed bridge steel plate comprises, by weight, 0.15-0.20% of C, 0.30-0.45% of Si, 1.4-1.8% of Mn, P<=0.015%, S<=0.008%, 0.020-0.060% of Nb, 0.020-0.060% of V, 0.008-0.030% of Ti, 0.15-0.35% of Ni, Ce<=0.0010%, Alt >=0.025 and the balance Fe and inevitable impurities. The rolling technology includes that the heating temperature is 1200-1250 DEG C, the heating time is larger than or equal to 200 minutes, the socking time is larger than or equal to 30 minutes, the initial rough rolling temperature of normalizing rolling is 1190-1230 DEG C, the initial precision rolling temperature is 885-955 DEG C and the finishing rolling temperature is 835-875 DEG C. The microalloyed bridge steel plate and the normalizing rolling technology thereof have the advantages that the steel plate is formed by the normalizing rolling technology, steel plates with a thickness of below 40mm can be produced, superior mechanical properties are provided, the tensile strength is larger than or equal to 600MPa, the yield strength is larger than or equal to 450MPa, the elongation is larger than or equal to 20%, the longitudinal impacting energy is larger than 120J at the temperature of minus 40 DEG C, the carbon equivalent is not larger than 0.45%, the welding performance is good, the production cost is low. Hot rolled steel plates are high in strength and plasticity, low in yield ratio and carbon equivalent, and superior in anti-shock and welding performances.

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