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JIS G3456 (Carbon ERW) STPT370 Carbon Seamless Steel Pipes for High Temperature Service

Short Description:

Pipe ordered under this specification is used mainly for piping subjected to a temperature over 350℃。For example: transporting steam,water etc.

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Application of JIS G 3456 Carbon (ERW) Seamless Steel Pipe

Pipe ordered under this specification is used mainly for piping subjected to a temperature over 350℃。For example: transporting steam,water etc.

Manufacturing Process of JIS G 3456 Carbon (ERW) Seamless Steel Pipe

By a seamless process: hot finished and cold finished 

Electric resistance welded

Details of JIS G 3456 Carbon (ERW) Seamless Steel Pipe We can supply

Manufacture:seamless pipe (hot finished or cold finished) / Electric resistance welded pipe

Size: O.D.: 15.0~660mm  W.T.: 2~50mm     

Grade:STPT370 ,STPT410,STPT480

Length: 6M or specified length as required.
Ends: Plain End, Beveled End.

Chemical Composition and mechanical properties JIS G3456 (Carbon ERW) Alloy Seamless Steel tubes

Grade and Chemical Composition (%)

 Grade

C≤

Si

Mn

P≤

S≤

STPT370

0.25

0.10~0.35

0.30~0.90

0.035

0.035

STPT410

0.30

0.10~0.35

0.30~1.00

0.035

0.035

STPT480

0.33

0.10~0.35

0.30~1.00

0.035

0.035

 

Mechanical Properties

Grade

Tensile strength

Yield strength

Elongation %

N/ m㎡

N/ m㎡

No.11 or No.12 test pieces

No. 5 test pieces

No. 4 test piece

   

Longitudinal

Transverse

Longitudinal

Transverse

STPT370

370 min

215 min

30 min

25 min

28 min

23 min

STPT410

410 min

245 min

25 min

20 min

24 min

19 min

STPT480

480 min

275 min

25 min

20 min

22 min

17 min

1. The above elongation value is not applicable to tubes with outer diameter <40mm. But it must be recorded.

2. The sample meets the requirements of JIS Z2201 standard;

3. For the tube with wall thickness <8mm, when the sample No. 12 or No. 5 is used, the minimum value of the elongation is reduced by 1mm according to the wall thickness, and 1.5% is subtracted from the above value.

Tolerance of outside diameter and wall thickness

    1. Tolerance of OD and W.T

      Division

      Tolerance on O.D

      Tolerance on W.T

       Hot finished Seamless Steel Pipe  

      D<50m

      ±0.5 mm

      S<4mm

      S≥4mm

      ±0.5mm

      ±12.5%

      50mm≤D<160mm

      ±1%

      160mm≤D<200

      ±1.6 mm

      D≥200mm

      ±0.8%

      Cold finished Seamless Steel Pipe

      D<40m

      ±0.3 mm

      S<2mm

      ±0.2mm

      D≥40mm

      ±0.8%

      S≥2mm

      ±10%

      ERW Steel Pipe 

      D<40m

      ±0.3 mm

      S<2mm

      ±0.2mm

      D≥40mm

      ±0.8%

      S≥2mm

      ±10%

      For pipes of nominal size 350A or over,the tolerance on O.D maybe determined by the circumferential length. In this case,the tolerance shall be +/-0.5%

Delivery Condition

Hot finished seamless(ERW) steel pipe: Low temperature annealing or normalizing maybe applied
Cold finished seamless(ERW) steel pipe: low temperature annealing or normalizing

 Appearance for JIS G3441 Alloy Seamless Steel tubes

Practicality is straight, the end is cut perpendicularly, and there are no harmful defects on the inner and outer surfaces. Defects can be removed, but the minimum wall thickness must be ensured.

Marking

Grade
Manufacture method code(hot finished seamless steel pipe: S-H; Cold finished seamless steel pipe: S-C).
Dimensions(nominal diameter X nominal wall thickness or outside diameter X wall thickness).
Manufacturer’s name or its identifying brand.

Manufacture method(hot finished ERW steel pipe: E-H; Cold finished ERW steel pipe: E-C).
Dimensions(nominal diameter X nominal wall thickness or outside diameter X wall thickness).
Symbol Z to denominate the special quality requirement.

Packing for JIS G3441 Alloy Seamless Steel tubes

Bare pipe, black coating ( customized);
6" and below sizes In bundles with two cotton slings, other sizes in loose;
Both ends with end protectors;
Plain end, bevel end (Positive deviation is allowed, and no negative deviation is allowed)
Marking.


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