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上海冶金局最近在上钢一厂10吨转炉及中心试验室炼钢厂3吨转炉上试炼成功10号无缝钢管钢,用10吋上小下大不带保温帽钢锭模锭铸(镇静钢),经开坯轧制成75毫米圆钢后由上海钢管厂穿孔冷拔成φ65毫米无缝钢管,成品率平均在91.1％,其中一级品占60％,个别炉号成品合格率达到97％。这一试验证明了,转炉钢完全能够用来制作无缝钢管。炼无缝钢管钢成功的关键在于很好控制冶炼和浇注操作,消灭后吹,合理脱氧,控制钢中非金属夹杂。上海的初步试制经验如下: (1)铁水质量:铁水含硫0.08～0.09％;含磷0.40％,采用小高炉生铁及部分马鞍山生铁,使用碱性化铁炉,铁水温度在1280～1300℃(光学高温计读数,下同)。
Recently, Shanghai Metallurgical Bureau successfully trialled No. 10 seamless steel tube on a 10-ton converter of Shanghai First Steel Works and a 3-ton converter at a central laboratory steel mill. The 10-inch seamless steel tube was cast on a 10- Steel), after billet rolling into 75 mm round bar, the steel pipe factory in Shanghai was perforated and cold-drawn into φ65 mm seamless steel pipe. The average yield of finished products was 91.1%, of which the first-grade products accounted for 60%. The qualified rate of individual heat- 97%. This test proved that converter steel can be used to make seamless steel tubes. The key to the success of refining seamless steel pipe is to control the smelting and pouring operations well, eliminate blow-off, reasonably deoxidize and control non-metallic inclusions in the steel. Shanghai preliminary trial experience is as follows: (1) the quality of hot metal: 0.08 ~ 0.09% of molten sulfur; phosphorus 0.40%, using a small blast furnace pig iron and some Ma’anshan pig iron, the use of alkaline iron furnace temperature of 1280 ~ 1300 ℃ Optical pyrometer readings, the same below).