無縫鋼管淬火裂紋產(chǎn)生原因及預(yù)防措施

Analysis of Reasons for Quench-caused Crack of Seamless Steel Tube and Relevant Preventive Actions

摘要: 根據(jù)無縫鋼管制造工藝特點，結(jié)合宏觀形貌及顯微組織分析，認為無縫鋼管淬火裂紋產(chǎn)生的原因主要為表面缺陷、應(yīng)力開裂和表面增碳。分析不同淬火裂紋的形成機理，并提出相應(yīng)的預(yù)防措施。分析認為：提高毛管表面質(zhì)量，優(yōu)化淬火工藝參數(shù)，提高鋼坯成分均勻性等，可以有效減少無縫鋼管淬火裂紋的產(chǎn)生。

Abstract: Based on the characteristics of the manufacturing process for the seamless steel tube,the major reasons for the quench-caused crack of the tube is identified via analysis of both the macro-morphology and the microstructure of the tube, i.e., the surface defect, the stress-induced cracking, and surface carbon pick-up. And the development mechanism for different quench-caused cracks are analyzed, and accordingly the preventive action are proposed. The analysis also leads to such a conclusion that the occurrence rate of the quench-caused crack of the seamless steel tube is expected to be remarkably reduced by means of improving the as-rolled tube surface quality,optimizing the quenching process parameters,and enhancing the homogeneity of the billet,etc.