公开(公告)号：US5186769A

公开(公告)日：1993-02-16

申请号：US751078

申请日：1991-07-28

申请人： Patrick J. Hunt ,  John J. Jonas ,  Stephen Yue ,  George E. Ruddle ,  Lakshman N. Pussegoda

发明人： Patrick J. Hunt ,  John J. Jonas ,  Stephen Yue ,  George E. Ruddle ,  Lakshman N. Pussegoda

IPC分类号： C21D6/02 ,  C21D8/10

CPC分类号： C21D6/02 ,  C21D8/10

摘要： A method for producing seamless steel tubes suitable for use as grades of casing and line pipe having yield strengths in excess of 70,000 psi, without being heat treated. Such steels are made of an alloy comprising, by weight, about 0.10% to 0.18% carbon, about 0.10% to 2.0% manganese, about 0.10% to 0.16% vanadium, about 0.008% to 0.012% titanium and about 150 parts per million to 220 parts per million nitrogen, the balance comprising iron and incidental impurities. The subject method comprises the steps of alloying a steel of the aforesaid chemical composition, forming the steel into a billet of steel, reheating the billet in a reheating furnace, passing the billet through a piercing mill to form a steel shell, elongating the steel shell within a mandrel mill, and reducing the diameter of the elongated shell in a stretch reducing mill. Strains are applied to the shell in the stretch reducing mill below the T.sub.nr of the steel and above the A.sub.r3 to provoke dynamic recrystallization. The subject method may also include the steps of cooling the steel shell after it exits the mandrel mill to a temperature below its A.sub.r1 temperature, prior to reheating, and/or accelerated cooling (optional, special cooling may not be necessary for thinner walls) after exiting the stretch reducing mill at a rate between 3.degree. C. to 5.degree. C. per second. The nitrogen and vanadium are preferably introduced to the steel during alloying in the form of a VN alloying agent.

摘要翻译： 适用于不经热处理的屈服强度超过70,000psi的套管和管线等级的无缝钢管的生产方法。 这种钢由合金组成，包括约0.10％至0.18％的碳，约0.10％至2.0％的锰，约0.10％至0.16％的钒，约0.008％至0.012％的钛和约150ppm的钛 220百万分之氮，余量由铁和附带杂质组成。 本发明的方法包括以下步骤：将上述化学组成的钢合金化，将钢形成钢坯，在再加热炉中重新加热坯料，使坯料通过穿孔机形成钢壳，使钢壳伸长 在芯棒式无缝管轧机中，并且在减速磨机中减小细长壳体的直径。 将菌株施加到钢的Tnr下方的拉伸还原轧机的壳体上，并且在Ar 3上方引起动态再结晶。 本发明的方法还可以包括以下步骤：在再次加热和/或加速冷却之后将钢壳冷却到低于其Ar1温度的温度下冷却（可选地，对于较薄壁而言不需要特殊的冷却） 以3℃至5℃/秒的速率离开拉伸还原研磨机。 氮和钒优选在VN合金化剂形式的合金化过程中引入钢中。

公开(公告)号：US5226978A

公开(公告)日：1993-07-13

申请号：US751071

申请日：1991-08-28

申请人： Patrick J. Hunt ,  John J. Jonas ,  Stephen Yue ,  George E. Ruddle

发明人： Patrick J. Hunt ,  John J. Jonas ,  Stephen Yue ,  George E. Ruddle

IPC分类号： C21D6/02 ,  C21D8/10

CPC分类号： C21D8/10 ,  C21D6/02 ,  Y10S148/909

摘要： Seamless steel tubes suitable for use as grades of casing and line pipe having yield strengths in excess of 70,000 psi, without being heat treated, are made of an alloy comprising, by weight, about 0.10% to 0.18% carbon, about 1.0% to 2.0% manganese, about 0.10% to 0.16% vanadium, about 0.008% to 0.012% titanium and about 150 parts per million to 220 parts per million nitrogen, the balance comprising iron and incidental impurities. Strains are applied to the shell in a stretch reducing mill below the T.sub.nr of the steel and above the A.sub.r3 to provoke dynamic recrystallization. The nitrogen and vanadium are preferably introduced to the steel during alloying in the form of a VN alloying agent. The vanadium, titanium and nitrogen are predominantly present as vanadium nitride and titanium nitride. The steel may also comprise 0.03% to 0.05% aluminum by weight.

摘要翻译： 适用于不经热处理的屈服强度超过70,000psi的套管和管线管等级的无缝钢管由合金制成，该合金包含重量约0.10％至0.18％的碳，约1.0％至2.0％ 约0.10％至0.16％的钒，约0.008％至0.012％的钛和约150份的百万分之一至220份/百万的氮，余量包括铁和杂质。 将菌株施加到钢的Tnr下方的拉伸还原研磨机中并在Ar 3上方引起动态再结晶。 氮和钒优选在VN合金化剂形式的合金化过程中引入钢中。 钒，钛和氮主要作为氮化钒和氮化钛存在。 钢还可以包含0.03重量％至0.05重量％的铝。