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Pipe fittings series
Pipe fittings series
Pipe fittings series
Product description

DIAMENSIONAL TOLERANCES

Types of steel tubes

Outer diameter

Wall thickness

Cold-rolled tubes

Tube sizes(mm)

Tolerances(mm)

Tolerances(mm)

<114.3

±0.79

-12.50%

MECHANICAL PROPERTIES

Standard codes

Models of steel tubes

Tensite strength(MPa)

Yield strength(MPa)

Elongation(%)

Hardness

API SPEC 5CT

J55

≥517

379~552

check the table

 

K55

≥517

≥655

 

N80

≥689

552~758

 

L80(13Cr)

≥655

552~655

≤241HB

P110

≥862

758~965

 

CHEMICAL COMPOSITION

Standard codes

Models of steel tubes

Chemical compositions(%)

C

Si

Mn

P

S

Cr

Ni

Cu

Mo

V

Al

API SPEC 5CT

J55K55

0.34~0.39

0.20~0.35

1.25~1.50

≤0.020

≤0.015

≤0.15

≤0.20

≤0.20

 

 

≤0.020

(37Mn5)

N80

0.34~0.38

0.20~0.35

1.45~1.70

≤0.020

≤0.015

≤0.15

 

 

 

0.11~0.16

≤0.020

(36 Mn2V)

L80(13Cr)

0.15~0.22

≤1.00

0.25~1.00

≤0.020

≤0.010

12.0~14.0

≤0.20

≤0.20

 

 

≤0.020

P110

0.26~0.35

0.17~0.37

0.40~0.70

≤0.020

≤0.010

0.80~1.10

≤0.20

≤0.20

0.15~0.25

≤0.08

≤0.020

(30CrMo)




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