JIS G3456 High Temperature Carbon Steel Pipes
Standard:JIS G3456 JIS G3456 Carbon Steel Pipes mainly used for piping at a temperature over 350℃.Steel Grade: STPT 370 ,STPT 410 ,STPT 480.

Description

JIS G3456 High Temperature Carbon Steel Pipes
Standard:JIS G3456
JIS G3456 Carbon Steel Pipes mainly used for piping at a temperature over 350℃.Steel Grade: STPT 370 ,STPT 410  ,STPT 480.
Steel Grade: STPT 370 ,STPT 410  ,STPT 480
Method of Manufacture
The Carbon Steel Pipe shall be manufactured from coarse-grained killed steel by the seamless or electric resistance welding process.
However, the pipe of grade STPT 480 Carbon Steel Pipe shall be manufactured by the seamless process.
JIS G3456 High Temperature Carbon Steel Pipes Quick Details
Type：Seamless Steel Pipe.
Material：STPT 370 ,STPT 410 ,STPT 480
Outside Diameter：15mm-219mm
Wall thickness：0.5mm——21mm
Length：6M or specified length as required.
Ends：Plain End、Beveled End、Treaded
Heat treatment
Table 1 Heat treatment
Grade Hot finished seamless steel pipe Cold finished seamless steel pipe Hot finished electric resistance welded steel pipe
Electric resistance welded steel pipe other than hot finished
STPT370
As  manufactured.  However,  low temperature annealing or normalizing may be applied, as necessary.
Low  temperature  annealed  or normalized.
As manufactured. However, low temperature annealing
or normalizing may be applied, as necessary.
Low temperature annealed or
normalized.
STPT410
STPT480 – –
Chemical Composition
Table 2  Chemical Composition Of JIS G3456 Carbon Steel Pipes
Grade Chemical Composition %
C Si Mn p S
STPT 370 0.25 max. 0.10~0.35 0.30~0.90 0.035 max. 0.035 max.
STPT 410 0.30 max. 0.10~0.35 0.30~1.00 0.035 max. 0.035 max.
STPT 480 0.33 max. 0.10~0.35 0.30~1.00 0.035 max. 0.035 max.
Mechanical Properties
Table 3  Mechanical Properties of JIS G3456 Carbon Steel Pipes
Letter symbol of grade Mechanical Properties
Tensile strength Yield strength Elongation %
kgf/m㎡  {N/ m㎡} kgf/m㎡  {N/ m㎡} No.11 and No.12 test pieces No. 5 test pieces No. 4 test piece
Longitudinal Transverse Longitudinal Transverse
STPT370 38 {373}min 22{216} min 30 min 25 min 23 min 28 min
STPT 410 42{412}min 25{245} min 25 min 20 min 19 min 24 min
STPT 480 49{481} min. 28{275} min. 25 min. 20 min. 17 min. 22 min.
Appearance
The pipe shall be practically straight, and its both ends shall be at right angles to the axes.
The inside and outside surfaces of the pipe shall be well-finished, and free from defects detrimental to practical use.
Dimensional Tolerances
Dimensional Tolerances The tolerances on outside diameter, wall thickness and deviation in wall thickness of the pipe shall be as specified Table 4.
In the case where the pipe length is specified by the purchaser, the tolerances on the pipe length shall be on the plus side.
Table 4 Dimensional Tolerances
Division Tolerances on outside diameter
Tolerances on wall thickness
Tolerance on deviation in wall thickness
Hot finished seamless steel pipe
 Up to 50 mm 【0.5mm
≤Up to 4 mm
【0.5mm
Up to and incl. 20 % of
wall thickness
50mm and over, up to 160mm
【1%
160mm and over, up to 200mm
【1.6mm
≤4mm and over
【12.5%
200mm and over 【0.8%
However, for pipes 350mm and over in diameter, the length of circumference may
substitute as a basis for tolerances, In this case, the tolerances shall be 【0.5%.
Cold finished seamless steel pipe and electric resistance welded steel pipe
 Up to 40mm 【0.3mm
≤Up to 2 mm
【0.2mm
 –
Remarks
The deviation in wall thickness means the ratio of the difference between the maximum and the minimum of the measured thickness of a wall in the same section to the specified wall thickness. This shall not be applied to pipes under 5.6mm in wall thickness.
Tests
Chemical Analysis
Tensile Test
Flattening Test
Bending Test
Hydrostatic Test or Nondestructive Examination
Report
The manufacturer shall, as a rule, submit to the purchaser the report on the test results, method of manufacture, ordered dimensions, quantity and work lot number traceable to the manufacturing conditions, etc.
Types of Packaging:
– Bundles (hexagonal)
– Wooden Boxes
– Crates (steel/wooden)
– Special crates for U-Bend tubes with each radius separated
– Our JIS G3456 High Temperature Carbon Steel Pipes packing can meet any needs of the customers.