API 5L Gr B Seamless Steel Pipe

API 5L specification is for welded and seamless Steel pipe for pipeline transportation systems Petroleum and natural gas industries. Although in recent years more and more projects designer will adopt ERW welded pipe or spiral welded pipes as line pipe instead seamless steel pipe, API 5L GR B seamless steel pipe is still in large demand in worldwide engineering industry. Let’s see the API 5L requirements for API 5L Grade B seamless steel pipes.

1. API 5L Gr B Seamless Steel Pipe PSL1 Chemical Composition

Steel grade	Mass fraction, based upon heat and product analyses a
	%
	C	Mn	P		S	V	Nb	TI
	max. b	max. b	min.	max.	max.	max.	max.	max.
Seamless pipe
L245 or B	0,28	1,20	–	0,030	0,030	c,d	c,d	d

2. API 5L GR B Seamless PSL1 Carbon Pipe Mechanical Properties

Pipe grade	Pipe body of seamless and welded pipes			Weld seam of EW, SAW and COW pipes
Pipe grade	Yield strength a Rt0,5 MPa (psi) minimum	Tensile strength a Rm MPa (psi) minimum	Elongation Af % minimum	Tensile strength b Rm MPa (psi) minimum
L245R or BR L245 or B	245 (35 500)	415 (60 200)	c	415 (60 200)

3. API 5L Gr B Seamless Steel Pipe PSL2 Chemical Composition

Steel grade (Steel name)	Mass fraction, based upon heat and product analyses % maximum									Carbon equivalent a % maximum
Steel grade (Steel name)	C b	Si	Mn	P	S	V	Nb	Ti	Other	CEIIW	CEPcm
Seamless steel pipe
L245R or BR	0,24	0,40	1,20	0,025	0,015	c	c	0,04	e	0,43	0,25

4. API 5L Grade B PSL2 SMLS Steel Pipe Tensile Strength Properties

Pipe grade	Pipe body of seamless and welded pipes
	Yield strength a Rt0,5 b		Tensile strength a Rm		Ratio a, b, c	Elongation Af
	MPa (psi)		MPa (psi)		Rt0,5/Rm	%
	minimum	maximum	minimum	maximum	maximum	minimum
L245R or BR L245N or BN L245Q or BQ L245M or BM	245 (35 500)	450 e (65 300) e	415 (60 200)	760 (110 200)	0,93	f

5. API 5L GRADE B Thickness tolerance for both PSL1 & PSL2 seamless pipe

Wall thickness t mm (in)	Tolerances a mm (in)
SMLS pipe b
≤4,0 (0.157)	+0,6 (0.024) -0,5 (0.020)
＞4,0 (0.157) to ＜25,0 (0.984)	+0,150 t -0,125 t
≥25,0 (0.984)	+3,7 (0.146) or 0,1 t, whichever is the greater -3,0 (0.120) or . 0,1 t, whichever is the greater

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