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JIS G 3456 STPT370 Carbon Seamless Steel Pipes for High Temperature Service

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

PRODUCT DESCRIPTION

Standard: JIS G 3456

Application of JIS G 3456 Carbon 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 Seamless Steel Pipe:

By a seamless process: hot finished and cold finished

Details of JIS G 3456 Carbon Seamless Steel Pipe We can supply:

Manufacture: seamless pipe (hot finished or cold finished)

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 G 3456 Black Seamless Steel Pipe

Grade and Chemical Composition (%)

GradeC≤SiMnP≤S≤
STPT3700.250.10~0.350.30~0.900.0350.035
STPT4100.300.10~0.350.30~1.000.0350.035
STPT4800.330.10~0.350.30~1.000.0350.035


Mechanical Properties
GradeTensile strengthYield strengthElongation %
N/ m㎡N/ m㎡ No.11 or No.12 test piecesNo. 5 test piecesNo. 4 test piece


LongitudinalTransverseLongitudinalTransverse
STPT370370 min215 min30 min25 min28 min23 min
STPT410410 min245 min25 min20 min24 min19 min
STPT480480 min275 min25 min20 min22 min17 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:

Tolerance of OD and W.T

DivisionTolerance on O.DTolerance on W.T
Hot finished Seamless Steel PipeD<50m±0.5 mmS<4mmS≥4mm±0.5mm±12.5%
50mm≤D<160mm±1%
160mm≤D<200±1.6 mm
D≥200mm±0.8%
Cold finished Seamless Steel PipeD<40m±0.3 mmS<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 steel pipe: Low temperature annealing or normalizing maybe applied

Cold finished seamless steel pipe: low temperature annealing or normalizing

Appearance for JIS G3456 Carbon Seamless Steel Pipes:

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:

a.Grade

b.Manufacture method(hot finished seamless steel pipe: S-H; Cold finished seamless steel pipe: S-C)

c.Dimensions(nominal diameter X nominal wall thickness or outside diameter X wall thickness)

d.Manufacturer's name or its identifying brand

e.Symbol Z to denominate the special quality requirement

Packing for JIS G3456 Carbon Seamless Steel Pipes:

a.Bare pipe, black coating (customized);

b.6" and below sizes In bundles with two cotton slings ,other sizes in loose;

c.Both ends with end protectors;

d.Plain end, bevel end(Positive deviation is allowed, and no negative deviation is allowed )

e.Marking.