国内露脸中年夫妇交换_午夜三级在线_色猫咪av_中文字幕日本_亚洲国产欧美一区_日日碰_丁香花电影在线观看免费高清_一二区视频_一区二区在线_91最新在线_农村一级毛片_欧美日韩福利视频_天天综合永久入口_动漫玉足吸乳羞免费网站玉足_久操热线

　　Must first change the bars are the minimum technical requirements of the concept of varieties of steel, do not need to pay attention to change technology operations management ideas, modern production equipment has become continuously improve steel quality, an important condition for high-quality steel for the construction industry.
　　
　　The steelmaking operation requires to do the following:
　　
　　(1) hot metal pre-desulfurization; (2) smelting, Executive Dephosphorization, carbon, nitrogen technical rules; (3) non-slag tapping; (4) ensure that the level of cleanliness of the steel internal controls; (5) implementation of ingredients fine-tuning and composition, the temperature uniformity of the refining process; (6) avoid secondary oxidation of the molten steel and resulfurization; (7) a rigorous process to ensure internal control components.
　　
　　Capability index (Cp) - Analysis the deviation and operation deviation increase 6 times the ratio of:
　　
　　CP = F/6σ experiment