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玉溪新兴钢铁有限公司研发了一种KNS烟草烤炉专用钢,对钢的化学成分、铸坯低倍组织、钢的力学性能、金相显微组织、夹杂物、晶界铜偏析、耐硫酸腐蚀性及高温抗氧化性等进行研究分析。结果表明:钢中添加了Ni、Cr、Cu、Sb等多种微合金耐蚀元素,化学成分均匀,铸坯低倍缺陷级别≤1.0级,低倍组织缺陷少且尺寸小,有利于轧材性能的改善;钢的抗拉强度为460~520 MPa,断后伸长率≥32%,铁素体晶粒度≥10.0级,非金属夹杂物≤1.0级;晶界、晶内铜含量基本一致,在晶界处没有出现铜偏析现象,避免了轧制过程“铜脆”裂纹的发生;耐硫酸腐蚀率为4.6 mm/a,800℃高温氧化跌落损失率为0.57%,具有良好的耐硫酸腐蚀性及抗高温氧化性。
Yuxi Xingxing Iron and Steel Co., Ltd. has developed a special KNS tobacco oven steel, the chemical composition of steel, slab microstructure, mechanical properties of steel, metallographic microstructure, inclusions, segregation of grain boundaries, sulfuric acid corrosion resistance and High temperature oxidation resistance and other research and analysis. The results show that many microalloyed anti-corrosion elements such as Ni, Cr, Cu and Sb are added to the steel with uniform chemical composition. The defect level of the slab is less than or equal to 1.0, the microstructure defects are small and the size is small, which is good for the rolling material The tensile strength of steel is 460-520 MPa, the elongation after fracture is ≥32%, the ferrite grain size is ≥10.0 grade, the non-metallic inclusions is ≤1.0, and the grain boundary and intragranular copper content are basically the same , There is no segregation of copper in the grain boundary, to avoid the occurrence of “copper brittle” cracks in the rolling process; the corrosion rate of sulfuric acid is 4.6 mm / a, the loss rate of oxidation drop at high temperature of 800 ℃ is 0.57% Sulfuric acid corrosion resistance and high temperature oxidation resistance.