高品质工程机械用钢生产工艺优化  

Production process optimization of high-quality steel for engineering machinery

作　　者：翟冬雨 张游游 雷晓荣 刘帅 常运合 Zhai Dongyu;Zhang Youyou;Lei Xiaorong;Liu Shuai;Chang Yunhe(Technology Research and Development Department,Nanjing Iron and Steel Co.,Ltd.,Nanjing 210035,Jiangsu,China;Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]南京钢铁股份有限公司技术研发处,江苏南京210035 [2]北京科技大学钢铁共性技术协同创新中心,北京100083

出　　处：《钢铁钒钛》2023年第1期167-174,共8页Iron Steel Vanadium Titanium

摘　　要：工程机械用热轧钢板不仅对产品力学性能要求严格,而且对钢板表面质量要求极为苛刻。南钢从合金成分设计着手,通过控制钢水冶炼过程、降低奥氏体化温度和二次开轧温度,成功获得显微组织由铁素体和珠光体组成,拉伸性能稳定、低温冲击均值高达220 J、晶粒度10级以上无带状组织的高品质工程机械热轧钢板。研究表明:洁净钢冶炼技术提升、低温奥氏体化技术结合低温轧制冷却工艺,减少钢板表面铁橄榄石生成量,钢板表面可形成致密稳定不易破碎的5μm厚度的氧化铁皮,氧化铁皮的存在避免了钢板在运输储存过程中表面的二次破坏,保证了客户使用质量。在满足了工程机械用钢对产品表面及性能的高要求的同时,企业也获得了高品质工程机械用钢的工艺研究成果及成套工业化制造技术。Hot-rolled steel plates used in engineering machinery have strict requirements not only on mechanical properties but also on surface quality. NISCO successfully produced hot-rolled steel plates for high-quality engineering machinery by optimizing chemical composition design, controlling molten steel smelting process, and reducing austenitizing temperature and second stage rolling temperature. The obtained steel achieved ferrite and pearlite microstructure, fine grain size of ASTM 10 without strip structure presence, and stable tensile properties as well as excellent low temperature impact value up to 220 J. The combination of smelting technology of clean steel, low temperature austenitizing technology and low temperature rolling and cooling process can reduce the iron olivine formation on steel plate surface and therefore promote a dense, stable and unbreakable oxide scale with the thickness of 5 μm. The existence of the oxide scale avoids the secondary damage of the plate surface during transportation and storage, and ensures the use quality for customers. Through this research the industrial manufacturing technology of high-quality steel of engineering machinery had been obtained.

关 键 词：热轧钢板 工程机械 力学性能 表面质量 显微组织 

分 类 号：TF76[冶金工程—钢铁冶金] TG142.1[一般工业技术—材料科学与工程]