典型碳钢高压锅炉管带状组织成因及其对持久强度的影响
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摘要
简述碳钢带状组织的形成机理,分析不同炼钢工艺对热轧SA210Gr.C、20G碳钢高压锅炉管带状组织的影响,研究轧制过程中带状组织的变化情况,以及带状组织对钢管持久强度的影响。分析认为:采用小规格管坯轧制及模铸锻造工艺,降低Mn含量,能够在一定程度上减轻轧制后钢管的带状组织;在轧制过程中,即使终轧温度在1 000℃以上,带状组织依然明显;带状组织对持久强度略有影响,但即使存在较严重带状组织的钢管,其持久强度依然能够满足相关标准要求,且有较大富余量。
The formation mechanism of band structure in carbon steel is introduced and the influence of different steelmaking processes on band structure in hot-rolled SA210Gr.C and 20G carbon steel high pressure boiler tubes are analyzed. The changing status of the band structure during the rolling process and the influence of the band structure on the creep rupture strength of the tubes are studied. The analysis shows that by adopting the small size billets and the mold casting and forging process,and lowering the content of Mn,the band structure in the rolled tubes may be alleviated to a certain degree. It is found that even when the finishing temperature is above 1 000 ℃, the band structure is still obvious. The band structure has slight influence on endurance strength, but even for tubes with severe band structure,their endurance strength can still meet the relevant standard requirements with big margin.
The formation mechanism of band structure in carbon steel is introduced and the influence of different steelmaking processes on band structure in hot-rolled SA210Gr.C and 20G carbon steel high pressure boiler tubes are analyzed. The changing status of the band structure during the rolling process and the influence of the band structure on the creep rupture strength of the tubes are studied. The analysis shows that by adopting the small size billets and the mold casting and forging process,and lowering the content of Mn,the band structure in the rolled tubes may be alleviated to a certain degree. It is found that even when the finishing temperature is above 1 000 ℃, the band structure is still obvious. The band structure has slight influence on endurance strength, but even for tubes with severe band structure,their endurance strength can still meet the relevant standard requirements with big margin.
引文
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[14]沈永革,陈连生,宋进英,等.石油套管用钢带状组织研究[J].钢铁钒钛,2012,33(4):101-106.
[15]姜求志,王金瑞.火力发电厂金属材料手册[M].北京:中国电力出版社,2001.
[2]张鹏远,隋晓红,苏洪英,等.含锰结构钢中带状组织及其对力学性能的影响[J].鞍钢技术,2010(5):24-27,35.
[3]张迎晖,赖泓州,赵鸿金.钢中带状组织的研究现状[J].轧钢,2014,31(3):45-47.
[4]张延玲,刘海英,阮小江,等.中低碳齿轮钢中合金元素的偏析行为及其对带状组织的影响[J].北京科技大学学报,2009,31(S1):199-206.
[5]李兵,胡天明,陈琦,等.火电厂主给水管带状组织及安全性的研究[J].电力建设,2002,23(3):9-11.
[6]刘富军,刘年富,廖卫团.带状组织对低碳微合金钢性能的影响及控制[J].南方金属,2011(1):7-10.
[7]孔繁革,王欣,崔丽,等.锅炉用20G钢管带状组织对横向性能的影响[J].锅炉制造,2000(2):52-57.
[8]张鹏,赵国仙,毕宗岳,等.夹杂物和带状组织对管线钢腐蚀性能的影响[J].热加工工艺,2014,43(18):34-38.
[9]王芳,袁书强,田雨江,等.带状组织减轻或消除工艺研究现状[J].热加工工艺,2013,42(5):52-57.
[10]刘云旭.低碳合金钢中带状组织的成因、危害和消除[J].金属热处理,2000(12):1-3.
[11]Leslie W C.The physical metallurgy of steels[M].Washington:Hempisphere Publishing Corp.,1981.
[12]刘源,许磊磊,赵庆权,等.冷却速率和冷却温度对SA-210Gr.C钢中带状组织形成的影响[J].钢铁研究学报,2014,26(6):57-60.
[13]王松林,陈俊德,赵成英.消除钢管中带状组织的热处理[J].热处理技术与装备,2010,31(4):26-30,33.
[14]沈永革,陈连生,宋进英,等.石油套管用钢带状组织研究[J].钢铁钒钛,2012,33(4):101-106.
[15]姜求志,王金瑞.火力发电厂金属材料手册[M].北京:中国电力出版社,2001.