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为了给石油工业提供更多的优质石油套管,近几年我厂对石油套管的生产工艺进行了大量的试验研究。现已在周期轧管机组上按 API 标准成批生产大口径石油套管。目前,国外通常采用中碳锰钢,经热轧或正火,或经调质生产J55、N80级石油套管。我厂在采用 D40钢热轧生产J55套管的初期,大口径管((?)φ244.5mm)的屈服强度(σ_(0.5))内控合格率偏低(N80套管采用热轧后调质生产),因此提高热轧
In order to provide the oil industry with more high-quality oil casing, in recent years I plant a lot of experimental research on the production process of oil casing. Large-diameter oil casing is now mass-produced according to the API standards in the periodic rolling mill unit. At present, foreign countries usually use medium-carbon manganese steel, hot-rolled or normalized, or quenched and tempered to produce J55, N80 grade oil casing. In the early stage of producing J55 casing by D40 steel hot rolling, the internal control yield rate of the large-diameter pipe (φ244.5mm) yield strength (σ_ (0.5)) was low (the N80 casing was treated with hot-rolled and post-quenched Production), thus increasing hot rolling