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发明授权
CN109082594B 一种耐酸性土壤腐蚀埋地结构用钢及其制造方法 有权

一种耐酸性土壤腐蚀埋地结构用钢及其制造方法
摘要：
本发明公开一种耐酸性土壤腐蚀埋地结构用钢及其制造方法。钢中含有C：0.02％～0.07％、Si：0.05％～0.25％、Mn：0.20％～0.90％、Nb：0.01％～0.03％、Ti：0.01％～0.03％、Cr：2.5％～3.9％、Cu：0.50％～0.70％、Sb：0.03％～0.10％、Mo：0.30％～0.50％、Ni：0.25％～0.45％、Al：0.01％～0.04％、P≤0.015％、S≤0.005％，余量为铁和不可避免的杂质。铸坯下线缓冷时间≥72h；加热至1220～1250℃，随后进行两阶段控制轧制，粗轧终轧温度1080～1120℃，精轧开轧温度1020～1060℃，精轧终轧温度880～940℃，精轧总压下率≥65％，冷速10～30℃/s，750～800℃卷取；钢板强韧性和耐酸性土壤腐蚀性良好。
摘要（英）：

The invention discloses steel for an acid soil corrosion resistant buried structure, and a manufacturing method thereof. The steel contains 0.02-0.07% of C, 0.05-0.25% of Si, 0.20-0.90% of Mn, 0.01-0.03% of Nb, 0.01-0.03% of Ti, 2.5-3.9% of Cr, 0.50-0.70% of Cu, 0.03-0.10% of Sb, 0.30-0.50% of Mo, 0.25-0.45% of Ni, 0.01-0.04% of Al, no more than 0.015% of P, no more than 0.005% of S, and the balance iron and unavoidable impurities. The casting blank offline slow cooling time is greater than or equal to 72 h; heating is conducted to 1220-1250 DEG C, then two-stage controlled rolling is conducted, the rough-rolling final rolling temperature is 1080-1120 DEG C, the fine-rolling rolling starting temperature is 1020-1060 DEG C, the fine-rolling final rolling temperature is 880-940 DEG C, the fine rolling total reduction ratio is greater than or equal to 65%, the cold speed is 10-30 DEG C/s, and coiling is conducted at the temperature of 750-800 DEG C; and a steel plate is high in toughnessand good in acid soil corrosion resistance.

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