新型貝氏體中空鋼生產(chǎn)過程缺陷分析與預防

Analysis and Prevention of In-process Defects of New Type Bainitic Hollow Steel

摘要: 對新型貝氏體中空鋼在生產(chǎn)過程中出現(xiàn)的熱軋棒料裂紋和斷裂，熱穿-熱軋中空鋼的內(nèi)孔皺褶、表面重皮、內(nèi)孔脫碳、組織粗大等缺陷的原因進行了分析，并提出防止缺陷產(chǎn)生的措施。結(jié)果表明：深入了解貝氏體鋼的組織和性能特點，制定合理的棒料熱軋工藝和中空鋼熱穿-熱軋工藝，可以避免貝氏體鋼棒料及其中空鋼制造過程的缺陷。

Abstract: Analyzed in the paper are the causes for all the major defects as occurring during the manufacturing process of the new type bainitic hollow steel, including crack and fracture of the hot-rolled bar, and defects of the hot-pierced-rolled hollow steel such as inner surface fold, outer surface double skin, inner surface decarburization and coarse-grained microstructure.Accordingly, preventive actions against such defects are proposed.It is concluded that the above mentioned in-process defects as staying with the bainitic steel bar and hollow steel can be prevented by means of establishing proper steel bar hot-rolling process and hollow steel hot-piercing/hot-rolling process based on an in-depth understanding of the microstructure and performance characteristics of the bainitic steel.