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不含镍及少含镍的铬锰氮耐热及耐酸铜已广为使用,收到了很大的政治及经济效果。为了能及时配合冶炼的炉前分析工作,5月8～20日于上海材料研究所举办了铬锰氮钢快速分析的交流学习班,有全国19个有关单位参加。在交流学习期间,各单位都介绍了自己单位的先进经验,并对材料所初步拟订的学习交流资料提出了补充修改意见,使内容进一步完善。例如硅的分析,原来是用盐酸、过氧化氢溶解试样后,加氢氟酸处理。后来根据上海机修总厂的建议,学习了上钢五厂的先进经验,改变盐酸、过氧化氢的用量,使硅含量高达2%也不脱水,免除了氢氟酸处理,操作简单、迅速了,质量也更稳定了;又如硫氰酸盐法比色测定钼时铬(Ⅵ)的干扰、丁二肟法比色测定镍时锰的干扰,过去也是一直被忽略的;高氯酸氧化测定铬的条件;试样的处理等等。这些宝贵意见改进、充实了内容。在学习交流期间,对这些问题进行了试验,现整理如下。
Chromium-manganese-nitrogen-free and nickel-free nickel-free heat-resistant and acid-resistant copper are widely used and have received significant political and economic benefits. In order to timely with the smelting furnace front analysis, from May 8 to 20 at the Shanghai Institute of Materials held a rapid analysis of chrome manganese nitrogen steel exchange classes, with the participation of 19 relevant units nationwide. During the exchange of learning, all units introduced their own advanced experience, and proposed preliminary amendments to the materials for the study and exchange of ideas to make the content further improved. For example, the analysis of silicon, the original is hydrochloric acid, hydrogen peroxide dissolved sample, hydrofluoric acid treatment. Later, based on the suggestion of Shanghai Mechanical & Electrical Plant, he learned the advanced experience of Shanghai Wuchang Steel Factory and changed the dosage of hydrochloric acid and hydrogen peroxide to make the silicon content as high as 2% and did not dewate, eliminating the hydrofluoric acid treatment. The operation was simple and quick , And the quality is more stable. In the past, the interference of chrome (Ⅵ) by molybdenum thiocyanate colorimetric method for the determination of molybdenum by the method of butadiene dioxime colorimetry also has been neglected in the past; the perchloric acid oxidation Determination of chromium conditions; sample processing and so on. These valuable comments improve, enrich the content. During the study and exchange, we conducted tests on these issues and are summarized as follows.