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苏联每年约生产7千万吨普碳钢,其中约有6千万吨是Ст3钢薄板、小型和异型钢材。改善Ст3钢的质量,提高其工程建筑物的可靠性和使用寿命,将给国民经济带来巨大的效益。因此,亚速钢铁公司为提高此类钢的质量,采取了三步精炼工艺,即铁水喷吹含有颗粒状镁粉的压缩空气流进行炉外脱硫—转炉出钢后在钢包中采取液态合成渣渣洗—用氩气流喷硅钙粉进行钢水改性处理。所得钢产品的硫含量不超过0.006％,钙含量为0.003～0.007％。 CT3钢的耐蚀性在很大程度上取决于钢中硫化物夹杂的含量。高纯度钢的力学性能大为提高,特别是冲击韧性好,但其抗寒性较差(KCV~(-20)<30 J/cm~2)。为了提高该钢的综合性能,该公司制定出一种新的热处理方案:920℃正火,并由此温度淬火,随后于680℃回火。通过钢的高纯度化精炼、改性处
The Soviet Union produces 70 million tons of plain carbon steel each year, of which about 60 million tons are Ст3 steel sheets, small and special-shaped steel. Improve the quality of Ст3 steel, improve the reliability and service life of its engineering buildings, will bring tremendous benefits to the national economy. Therefore, in order to improve the quality of this kind of steel, Yousu Steel took a three-step refining process, that is, molten iron blasting compressed air stream containing granular magnesium powder for out-of-furnace desulfurization. After tapping the converter, liquid synthetic slag Slag wash - Spray Si powder with argon to modify the molten steel. The resulting steel product has a sulfur content of no more than 0.006% and a calcium content of 0.003% to 0.007%. The corrosion resistance of CT3 steel depends to a large extent on the amount of sulfide inclusions in the steel. The mechanical properties of high purity steel are greatly improved, especially the impact toughness is good, but its cold resistance is poor (KCV ~ (-20) <30 J / cm ~ 2). In order to improve the overall performance of the steel, the company developed a new heat treatment scheme: normalizing at 920 ° C and quenching at this temperature followed by tempering at 680 ° C. Through the refining of high purity steel, modified at