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一、课题提出 1Cr18Ni9Ti不锈钢管是上海钢铁研究所三车间的重点产品,年产量300吨左右,每年可创造利润440万元,约占我所总利润的十分之一。多年来,不锈钢管T法晶间腐蚀一直是我车间的主要质量问题,特别是78、79两年,不合格现象严重(见图1),其主要原因是原材料中碳含量偏高、Ti/c偏低。当采取措施把碳含量控制在0.08％以下、Ti/c控制在7倍以上时,80年下半年的晶间腐蚀一次合格率提高到97％。但是,这
First, the subject proposed 1Cr18Ni9Ti stainless steel tube is the focus of the Shanghai Iron and Steel Institute of the three workshops, the annual output of about 300 tons, an annual profit of 4.4 million yuan, accounting for about one-tenth of my total profit. Over the years, stainless steel tube T-law intergranular corrosion has always been my main quality problems in the workshop, especially 78,79 two years, the unqualified phenomenon is serious (see Figure 1), the main reason is the high carbon content of raw materials, Ti / c is low. When the carbon content is controlled below 0.08% and the Ti / C control is over 7 times, the pass rate of intergranular corrosion in the second half of 1980 will increase to 97% once. But this