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发明授权
CN109023071B 一种耐中性土壤腐蚀埋地结构用钢及其制造方法 有权

一种耐中性土壤腐蚀埋地结构用钢及其制造方法
摘要：
本发明公开一种耐中性土壤腐蚀埋地结构用钢及其制造方法。钢中含有C：0.02％～0.06％、Si：0.05％～0.22％、Mn：0.35％～1.15％、Nb：0.015％～0.035％、Ti：0.015％～0.035％、Cr：2.0％～3.5％、Cu：0.20％～0.40％、Sb：0.08％～0.18％、Mo：0.30％～0.50％、Ni：0.20％～0.40％、Al：0.01％～0.04％、P≤0.015％、S≤0.005％，余量为铁和不可避免的杂质。铸坯缓冷时间≥72h；加热至1220～1250℃，粗轧终轧温度1060～1100℃，精轧开轧温度1010～1050℃，精轧终轧温度850～920℃，精轧总压下率≥65％，冷速15～30℃/s，730～800℃卷取。钢板具有良好的强韧性和耐中性土壤腐蚀性。
摘要（英）：

The invention discloses buried structure steel resistant to neutral soil corrosion and a manufacturing method of the buried structure steel resistant to neutral soil corrosion. The buried structure steel resistant to neutral soil corrosion contains 0.02%-0.06% of C, 0.05%-0.22% of Si, 0.35%-1.15% of Mn, 0.015%-0.035% of Nb, 0.015%-0.035% of Ti, 2.0%-3.5% of Cr, 0.20%-0.40% of Cu, 0.08%-0.18% of Sb, 0.30%-0.50% of Mo, 0.20%-0.40% of Ni, 0.01%-0.04% of Al, not larger than 0.015% of P, not larger than 0.005% of S and the balance iron and inevitable impurities. The slow cooling time of a casting blank is longer than or equal to 72h; the temperature is raised to 1220-1250 DEG C through heating, the rough rolling finishing temperature is 1060-1100 DEG C, the precise rolling start temperature is1010-1050 DEG C, the precise rolling finishing temperature is 850-920 DEG C, the total reduction rate of precise rolling is larger than or equal to 65%, the cooling speed is 15-30 DEG C/s, and rollingis conducted at 730-800 DEG C. A steel plate has good toughness and neutral soil corrosion resistance.

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