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API 5L grade B (L245) chemical composition, tensile properties and OD wall thickness tolerances

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API 5L Pipe

Grade: L245 or Grade B (PSL1)

Chemical composition:

C: ≤0.28(seamless) ≤0.26(welded)

Mn:≤1.20

P:≤0.030

S: ≤0.030

Cu:≤0.50

Ni:≤0.50

Cr:≤0.50

Mo:≤0.15

*Unless otherwise agreed,V+Nb:≤0.06

*V+Nb+Ti: ≤0.15

*For every 0.01 per cent reduction in carbon content, the manganese content can be increased by 0.05 per cent, up to a maximum of 1.65 per cent.

Mechanical property:

Yield strength:≥245Mpa

Tensile strength:≥415Mpa

Weld tensile strength of welded steel pipes:≥415Mpa

Elongation:≥1940* AXC0.2/4150.9 Where AXC is the cross-sectional area of the tensile specimen

Tolerance of the outer diameter of the steel pipe:

OD mmDeviation of outer diameter at the end/mm
Seamless steel pipeWelded steel pipe
<60.3-0.8, +0.4
60.3≤D≤168.3-0.4, +1.6
168.3<D≤610±0.005D, MAX.±1.6
610<D≤1422±2.0±1.6
>1422According to the agreement

Thickness Tolerance of the steel pipe:

WT mmTolerance mm
Seamless steel pipe
≤4.0+0.6, -0.5
4<t<25+0.150t,-0.125t
≥25+3.7 or +0.1t,select-3.0 or -0.1t,select
Welded steel pipe
≤5.0±0.5
5.0<t<15±0.1t
≥15±1.5
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