Effects of Rolling Processes on Yield Ratio and Formability of Hot Rolled Gas Cylinder Steel

• Published in: Journal of iron and steel research, international Vol. 19; no. 3; pp. 52 - 55
• Main Authors: JIA, Yue-cai, GUO, Hai-rong, LI, Ran, LI, Hua-long
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.03.2012; Springer Singapore
• Subjects: Applied and Technical Physics; Engineering; ferrite-pearlite band; formability; Gas cylinders; Hot rolling; HP295钢; Iron and steel industry; Machines; Manufacturing; Materials Engineering; Materials Science; Metallic Materials; Physical Chemistry; plastic anisotropy; Processes; Segregations; Steel making; Steels; Surface layer; Texture; yield ratio; 产量比; 加热温度; 各向异性; 成形性; 气瓶钢; 热轧带钢; 轧制工艺; formability; plastic anisotropy; yield ratio; texture; ferrite-pearlite band
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(12)60073-9

Deep drawing properties of hot rolled gas cylinder steel was investigated by using HP295 steel in terms of microstructure, texture, yield ratio, plastic strain ratio （r value） and plastic anisotropy （Ar）. The grains in the hot strip were largely equiaxed, and the texture was weak, containing a- and ？＇fibre. Reheating temperature, finish roll ing temperature and cooling rate after rolling influenced the ferrite-pearlite band formation significantly, and the yield ratio increased steeply with decreasing coiling temperature below 630 ~C. The anisotropy is relatively high due to re- tained severe ferrite-pearlite band. A mechanism of the band formation due to manganese segregation is elaborated and confirmed validly, from which the measures to avoid the band formation are worked out. Rolling parameters have been optimized by the measures, and industrial production of the gas cylinder steel has been made possible with much improved r-and △r-values, while meeting other specifications.