API 5L Gr B Seamless Pipe

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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
CMnPSVNbTI
max. bmax. bmin.max.max.max.max.max.
Seamless pipe 
L245 or B 0,28 1,20 0,030 0,030 c,d c,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 
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) 
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
 
C b SiMnPSVNbTiOther CEIIWCEPcm 
Seamless steel pipe
L245R or BR 0,24 0,40 1,20 0,025 0,015 0,04 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

R

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

(65 300)

415 

(60 200) 

760 

(110 200) 

0,93 

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

For more info and price of API 5L Gr B seamless pipes, please send us enquiry and you will have quick reply soon.