JIS G3454 STPG 370 Carbon Steel Pipes for Pressure Service
Standard:JIS G3454 Carbon Steel Pipes for Pressure Service
JIS G3454 STPG 370 Carbon Steel Pipes used for pressure service at an approximate maximum temperature of 350℃.
JIS G3454 STPG 370 Carbon Steel Pipes Quick Details
Manufacture:Seamless of the electric resistance welding process
Out Dimensions: 14mm-508mm
Wall Thickness: 2mm-60mm
Length: Fixed(6m,9m,12,24m) or normal length(5-12m)
Ends: Plain End, Beveled End, Treaded
Chemical Composition of JIS G3454 STPG 370 Carbon Steel Pipes for Pressure Service
|
Letter symbol of grade |
Chemical Composition % |
||||
|
C |
Si | Mn | P |
S |
|
| STPG 370 | 0.25 max. | 0.35 max. | 0.30 ~0.90 | 0.040 max. |
0.040 max. |
Mechanical Properties of JIS G3454 STPG 370 Carbon Steel Pipes for Pressure Service
|
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 |
|||
| STPG 370 | 38 {373}min | 22{216} min | 30 min | 25 min | 23 min |
28 min |
Appearance
(1)The pipe are practically straight, and its both ends shall be at a right angle to its axis.
(2) The inside and outside surfaces of the pipe shall be well-finished and free form defects that are detrimental to practical use.
Testings
(1)Chemical analysis
(2)Tensile Test
(3)Flattening Test
(4) Bending Test
(5) Hydrostatic Test or Nondestructive Examination
Dimensions Tolerance of JIS G3454 Carbon Steel Pipes for Pressure Service
| Division | Tolerances on outside diameter | Tolerances on wall thickness |
| Hot-finished seamless steel pipe | 40 A or under 【0.5mm | Under 4mm +0.6mm -0.5mm 4mm or over +15% -12.5% |
| 50A or over up to and incl. 125 A 【1% | ||
| 150A 【1.6mm | ||
| 200A or over 【0.8% For the pipe of nominal size 350 A or over, the tolerances on outside diameter may be determined by the measurement of the length of circumference. In this case, the tolerances shall be 【0.5%. |
||
| Cold-finished seamless steel pipe and electric resistance welded steel pipe | 25 A or under 【0.3mm | Under 3mm 【0.3mm 3mm or over 【10% |
| 32 A or over 【0.8% For the pipe of nominal size 350 A or over, the tolerances on outside diameter may be determined by the measurement of the length of circumference. In this case, the tolerances shall be 【0.5%. |
Marking
Each pipe having passed the inspection shall be marked with the following items. However, the smaller pipes or other pipes specified by the purchaser may be bundled together and marked for each bundle by a suitable means. In both cases, the order of arranging the marked items is not specified.
When approved by the purchaser, a part of the items may be omitted.
(1) Letter symbol of grade (STPG 370 )
(2) Letter symbol indicating the manufacturing processes(3)
(3) Dimensions( 4 )
(4) Manufacturer’s name or its identifying brand
(5) Letter symbol denothing the supplementary quality requirement, Z
Note( 3 )
The letter symbol indicating the manufacturing processes(3) shall be as follows, provided that the dash may be omitted leaving a blank.
Hot-finished seamless steel pipe – S – H
Cold-finished seamless steel pipe- S – C
Electric resistance welded steel pipe other than hot-finished and cold -finished ones – E – G
Hot-finished electric resistance welded steel pipe- E – H
Cold-finished electric resistance welded steel pipe – E – C
Note( 4 )
The dimensions shall be expressed as follows.
Nominal diameter × Nominal wall thickness
Example: 50A × Sch 40, 2 B × Sch 40
