公司生產的09MnD、09MnNiD低溫換熱器用無縫鋼管，根據不同的工藝要求，Mn、S含量的規(guī)定上較 GB150-1998標準有所加嚴，S含量小于0.015%,實際水平在0.010%以下，此外參照GB3531-1996《低溫壓力容器用低合金鋼鋼板》標準的相應規(guī)定，增加了鋼中酸溶鋁含量的要求?？s小了抗拉強度范圍，提高了對鋼管強度穩(wěn)定性的要求。相同技術要求的09MnD、09MnNiD無縫鋼管，其每一爐之間的化學成分非常接近，低溫沖擊性能非常好。生產的低溫鋼鋼水純凈度高，晶粒度大于8級。加上完善的檢測設備，保證了無縫鋼管大批量流水線生產的質量穩(wěn)定性。

無縫鋼管同樣具有高清潔度、合理的化學成分配比和科學的熱處理制度等特點，因此鋼的可焊性及制造性有明顯的提髙，符合熱交換器的制造標準GB151-1999。實際檢測此系列鋼在-50℃、-70℃時沖擊值遠遠高于企標、國標要求。09MnD、09MnNiD低溫用無縫鋼管主要用于 煤化工行業(yè)、石化行業(yè)的乙稀、聚丙烯等裝置的低溫換熱器上。

 

According to different technical requirements, the 09MnD, 09MnNiD seamless steel pipes for low temperature heat exchanger which produced by our company, have been tightened the content of the iVl n and Scompared with the GB150-1998. The content of S is less than 0.015%, while the actual content is below 0.010%. Besides, by referring to the corresponding regulations of the GBB531-1996, we increased the requirements of the content of acid soluble aluminum in steel, which narrowed the range of the tensile strength and improved the requirement for the stability of The steel pipes.

The 09MnD, 09MnNiD seamless steel pipes of the same technical requirements have very dose chemical composition of each furnace and good low-temperature impacting property. The molten steel of low temperature in production has high purity and its grain size is greater than level 8. With the perfect testing equipment, we can ensure the stability of quality of assembly line production seannless steel pipes.

The seamless steel pipes also have the characteristics of high cleanliness, reasonable proportion of the chemical composition and scientific heat treatment system, etc. Therefore, the steel weldability and manufacturing has increased significantly, which accords with GB151-1999, the manufacturing standard of heat exchanger. The impact value on this series of steel in actual detection at-50℃ and -70℃ is much higher than the requirements of enterprise and nat onsl standards.The 09MnD,09MnNiD seamless steel pipes for low-temperature service are mainly used in low-temperature heat exchanger in the coal chemical, petrochemical, ethylene and polypropylene device, etc.