Product Details

API 5L A25.A.B X42-X70 mild seamless oil and gas pipe

Production standards

DIN2391, EN10305, ASTM A519 etc

GB/T 3639 Cold drawn or cold rolled precision seamless steel tubes
GB/T 8713 inside precision seamless tubes for hydraulic pressure and pneumatic services

Grade and Chemical Composition(%):

Steel grade	Chemical composition(%)
Steel grade	C max	Si max	Mn	P max	S max
St 35	0.17	0.35	≥0.40	0.025	0.025
St 45	0.21	0.35	≥0.40	0.025	0.025
St 52	0.22	0.55	≤1.60	0.025	0.025

Steel grade		Chemical composition(%)
Steel name	Steel number	C max	Si max	Mn	P max	S max	Al min
E215	1.0212	0.10	0.05	0.70	0.025	0.025	0.025
E235	1.0308	0.17	0.35	1.20	0.025	0.025	-
E355	1.0580	0.22	0.55	1.60	0.025	0.025	-

Mechanical Properties(Mpa):

Steel grade	Cold Drawn(hard) BK		Cold Drawn(soft) BKW		Cold Drawn wth stress relief BKS			Annealed GBK		Normalizing NBK
Steel grade	Tensile strength Rm N/mm min	Elonga tion% min	Tensile strength Rm N/mm min	Elonga tion % min	Tensile StrengthRm N/mm min	Yield strength ReH N/mm min	Elonga tion% min	Tensile strength Rm N/mm min	Elonga tion % min	Tensile Strength Rm N/mm min	Yield strengthReH N/mm min	Elonga tion % min
St35	480	6	420	10	420	315	14	315	25	340-470	235	25
St45	580	5	520	8	520	375	12	390	21	440-570	235	21
St52	640	4	580	7	580	420	10	490	22	490-630	355	22

Steel grade		Minimum values for the delivery condition
Steel name	Steel number	+ C		+ LC		+ SR			+ A		+ N
Steel name	Steel number	Rm Mpa	A%	Rm Mpa	A%	Rm Mpa	ReH Mpa	A%	ReH Mpa	A%	Rm Mpa	ReH Mpa	A%
E215	1.0212	430	8	380	12	380	280	16	280	30	290-430	215	30
E235	1.0308	480	6	420	10	420	350	16	315	25	340-480	235	25
E355	1.0580	640	4	580	7	580	450	10	450	22	490-630	355	22