连续热处理线开发框架锯条用钢工艺研究  

Study on production process of steel for frame saw blade developed by continuous heat treatment line

作　　者：曾斌[1] 汪净 梁亮 李昭东[2] 雍岐龙[2] ZENG Bin;WANG Jing;LIANG Liang;LI Zhao-dong;YONG Qi-long(Technical Center,Lianyuan Iron and Steel Co.,Ltd.,Loudi 417009,Hunan,China;Department of Structural Steels,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]湖南华菱涟源钢铁集团有限公司技术中心,湖南娄底417009 [2]钢铁研究总院有限公司工程用钢研究所,北京100081

出　　处：《钢铁》2023年第1期161-169,共9页Iron and Steel

摘　　要：框架锯已广泛应用于石材加工行业,框架锯条用钢是制备框架锯的必备材料,也是钢铁材料中的高附加值产品。采用国内自主设计的连续式淬火-回火热处理设备,拟开发目前国内外市场上未有使用的2.0 mm厚度薄型框架锯条用75Cr1高强度高韧性热处理钢带,以提高石材利用率。通过在连续热处理线上依次设定不同的加热炉奥氏体化温度、铅铋合金熔液温度、回火温度,采用材料试验机、洛氏硬度计、金相显微镜和扫描电镜研究三者对热处理钢带显微组织和力学性能的影响,探索出生产高性能框架锯条用材的最佳热处理工艺。结果表明,奥氏体化温度为930℃,铅铋合金熔液温度为250~315℃,回火温度为500~520℃,采用马氏体分级淬火,可制备出高性能的2.0 mm薄型75Cr1热处理钢带。此时,屈服强度为1157~1241 MPa,抗拉强度为1275~1368 MPa,伸长率为8.8%~13.8%,表面硬度为39.5HRC~42.5HRC,显微组织为回火屈氏体+少量贝氏体,晶粒尺寸极其细小均匀。通过与现有3.0 mm的厚规格高质量国外进口材进行显微组织与力学性能对比,所开发的2.0 mm新型薄规格材料可达到3.0 mm进口材料的质量水平,2.0 mm厚度的薄规格框架锯条用钢得到成功开发,其综合力学性能优越。该工艺的原理及参数范围不同于传统的油淬和盐浴淬火,这是对75Crl热处理工艺的全新报道和系统研究,可为研制该种材料提供工艺指导。Frame saw has been widely used in the stone processing industry.Steel for frame saw blade is an essential material for preparing frame saw and also a high value-added product in steel materials.The continuous quenching-tempering heat treatment equipment designed independently in China was used.It is planned to develop 75Cr1 high-strength and high-toughness heat-treated steel strip for 2.0 mm thin gauge frame saw blade,which is not used in the domestic and foreign markets at present,so as to improve the utilization rate of stone material.The austenitizing temperature of heating furnace,the melt temperature of Pb-Bi alloy and the tempering temperature were set in sequence on the continuous heat treatment line,and the effects of the three parameters on the microstructure and mechanical property of heat-treated steel strip were studied by using the material testing machine,Rockwell hardness tester,metallographic microscope and scanning electron microscope,to explore the optimal heat treatment process for producing high-performance frame saw blade material.The results show that the high-performance 75Cr1 heat-treated steel strip can be prepared with a thin gauge of 2 mm by martempering,when the austenitizing temperature is 930℃,the melt temperature of Pb-Bi alloy is 250-315℃,and the tempering temperature is 500-520℃.While,the yield strength is 1157-1241 MPa,the tensile strength is 1275-1368 MPa,the elongation is 8.8%-13.8%,the surface hardness is 39.5HRC-42.5HRC,the microstructure is tempered troostite+a small amount of bainite,and the grain size is extremely fine and uniform.By comparing the microstructure and mechanical property with the now available 3.0 mm thick gauge high-quality imported material from abroad,the developed 2.0 mm new thin gauge material can attain eqaul in quality of 3.0 mm imported material,and the 2.0 mm thin guage frame saw blade steel has been successfully developed,with superior comprehensive mechanical properties.The principle and parameter range of this continuous heat treatment are

关 键 词：框架锯条用钢 75Cr1 连续热处理线 马氏体分级淬火 铅铋合金熔液 

分 类 号：TG142.1[一般工业技术—材料科学与工程]