JIS G3457 Arc welded carbon steel pipes
pipe fittings materials data
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For the pipe fitting material, please check butt-weld-fitting-standard-data
1 Scope
This Japanese Industrial Standard specifies the arc welded carbon steel pipes (hereafter referred to as “pipes”) used for piping for steam, water, gas, air, etc. of comparatively low working pressure.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. The most recent editions of the standards (including amendments) indicated below shall be applied.
JIS G 0320 Standard test methods for heat analysis of steel products
JIS G 0404 Steel and steel products-General technical delivery requirements
JIS G 0415 Steel and steel products-Inspection documents
JIS G 0584 Ultrasonic examination for arc welded steel pipes
JIS Z 2201 Test pieces for tensile test for metallic materials
JIS Z 2241 Method of tensile test for metallic materials
JIS Z 3121 Methods of tensile test for butt welded joints
JIS Z 8401 Guide to the rounding of numbers
3 Grade and designation
The pipes shall be classified into one grade and its letter symbol shall be as given in table 1.
4 Method of manufacture
The method of manufacture of pipe shall be as follows:
a)The pipes shall be manufactured by spiral seam or straight seam welding. In either case, the internal and external surfaces of the pipe shall be automatic submerged arc welded in a butt joint.
b)The pipes shall be either as welded or as cold-expanded after welding, and, as a rule, should not be subjected to heat treatment.
c)Both ends of the pipe shall be finished plain ended or bevel ended(1).
Note (I) Unless otherwise specified, the shape of the bevel end shall be as shown in figure 1.
Application：Used for piping for the steam,water,gas,air,etc.
Chemical composition
Unit：%
| Symbol of grade | C | P | S |
| STPY400 | 0.25max | 0.040max | 0.040max |
Mechanical properties
| Symbol of
grade |
Base metal | Tensile
strength of weld N/mm² |
|||
| Tensile strength
N/mm² |
Yield point or proof stress
N/mm² |
Elongation% | |||
| Tensile test
piece |
Tensile test direction | ||||
| Test piece
No.5 |
Perpendicular to pipe axis
direction a） |
||||
| STPY 400 | 400min | 225min | 18min | 400min | |
| NOTE ：1N/mm²=1MPA
Note ：a） A test piece,when taken from the steel strip or steel plate,shall be either in parallel to or perpendicular to the rolling direction. |
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Elongation of pipes with a wall thickness under 8mm，tested using testpiece No.5(perpendicular to pipe axis direction)
Unit:%
| Wall thickness | Over 5mm up to and
incl.6mm |
Over 6mm up to and
incl.7mm |
Over 6mm up to and
incl.7mm |
| Elongation | 15min | 16min | 18min |
Tolerances on outside diameter and wall thickness
Unit:%
| Item | Tolerance | |
| Tolerance on outside diameter | ±0.5 | |
| Tolerance on wall thickness | Nominal dimameter 450A or under | +15
-12.5 |
| Nominal diameter over 450A | +15
-10 |
|
| Notes a）In this case,either the actually measured value of circumfential length or outside diameter and the
circumferential length or outside diameter obtained by conversion thereof shall be used. The mutual conversion of the outside diametre and the circumferential length shall be made by the following equation. D=l/π Where，D:outside diameter（mm）l：circumferential length（mm） π：3.1416 b）For the local parts such as repaired parts，the outside diameter tolerances in this table shall not apply. |
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C&N Huitong group can produce pipe fittings of such materials :
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