2021 J55, K55, L80, N80, P110, AISI 1020 Coupling Stock, Coupling Stock

2021 J55,K55,L80,N80,P110, AISI 1020 coupling stock, coupling blank 1.OD:1.9- 16",18-5/8",20"2.Material:J55,K55,N80,L80,P110,AISI1020.3.Product method: hot rolling , forge4.Standard:API 5CT,5L,GB8163.Specification:Coupling stock made in China famous steel maker :BAOTOU STEEL ,TPCO,Hengyang Valin Steel,BAOSTEEL,ANSTEEL ect .NameCo

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