焊管冷弯开裂缺陷种类及形成原因
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摘要
冷弯性能是检验板材力学性能的重要指标,然而开裂缺陷常出现在焊管冷弯过程中。使用OM、SEM及EDS等检测手段,对焊管冷弯开裂缺陷进行检测分析。结果表明:硅酸盐夹杂、硫化物夹杂、锆系耐材的脱落及加工硬化程度过高等都能导致焊管冷弯开裂。针对上述各种原因分别提出改善吹氩操作、控制压缩比、选择优异的水口材料以及优化轧制工艺等相应措施。
The cold bending performance is an important index for testing the mechanical properties of plate.However,the cracking defects often appear in welded pipe's cold bending process.The cold bending cracking defects of welded pipe were analyzed by using OM,SEM and EDS.The results show that the silicate inclusions,the sulfide inclusions,the shedding of zirconium system refractory and the banded structure caused by high degree of work hardening can lead to the cold bending cracking of welded pipe.For above various reasons,the measures are put forward,including improvement of argon blowing operation,compression ratio control,selection of excellent nozzle material and optimization of rolling technology.
The cold bending performance is an important index for testing the mechanical properties of plate.However,the cracking defects often appear in welded pipe's cold bending process.The cold bending cracking defects of welded pipe were analyzed by using OM,SEM and EDS.The results show that the silicate inclusions,the sulfide inclusions,the shedding of zirconium system refractory and the banded structure caused by high degree of work hardening can lead to the cold bending cracking of welded pipe.For above various reasons,the measures are put forward,including improvement of argon blowing operation,compression ratio control,selection of excellent nozzle material and optimization of rolling technology.
引文
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[9]骆瑞雪.铝/钢复合管轧制开裂的原因分析[J].热加工工艺,2012,41(13):217-219.
[2]孟宪成,罗廷梁,冯光宏.热轧带肋钢筋冷弯时沿横肋根部开裂的机理[J].钢铁,2007(6):69-73.
[3]卿颖,杨眉,晏利君,等.应变时效对X70大变形钢冷弯管拉伸性能和组织的影响[J].材料热处理学报,2014(12):155-159.
[4]朱红一,商存亮,刘微.中厚板冷弯裂纹分析[J].钢铁,2003(3):47-49.
[5]张庆军,曹胜利,朱立光,等.Q235B热轧带钢冷弯开裂原因分析与对策[J].铸造技术,2015(12):99-103.
[6]江崇华,周昭伟,葛学廉.夹杂物与氢对15Mn VN_q(C,B)钢对接接头冷弯性能的影响[J].焊接学报,1993(2):104-110.
[7]刘树信,王海滨.氧化锆及掺杂氧化锆的研究进展[J].耐火材料,2011(3):209-213.
[8]丁晔,孙维连,张云谦,等.45钢管冷轧开裂原因分析[J].金属热处理,2014(4):142-144.
[9]骆瑞雪.铝/钢复合管轧制开裂的原因分析[J].热加工工艺,2012,41(13):217-219.