JIS G3429 Seamless steel tubes for high pressure gas cylinders
- Model
- JIS G3429
Item specifics
- Delivery condition
- +A or +N
- Surface condition
- polished or honed
Review
Description
JIS G3429 Seamless steel tubes for high pressure gas cylinders
Dimensions and dimensional tolerances
Dimensions
outside diameter: 40-500mm
wall thickness: 3-30mm
Dimensional tolerances
Tolerance on outside diameter :+/- 1%
Tolerance on wall thickness : +30 / -0%
Tolerance on eccentricity : 20 max %
Tolerance on length : +30 / -0 mm
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Manufacturing method
The manufacturing method shall be as follows.
a) Tubes shall be manufactured by combination of the tube manufacturing method and the finishing method which are indicated. The symbol of manufacturing method shall be in accordance.
b) Tubes shall normally be as manufactured without heat treatment.
c) Tubes shall be furnished with plane ends, unless otherwise specified.
Chemical composition
Symbol of grade | C | Si | Mn | P | s | Ni | Cr | Mo |
STH11 | 0.50 max. | 0.10 to 0.35 | 1.80 max. | 0.035 max. | 0.035 max. | / | / | / |
STH12 | 0.30 to 0.41 | 0.10 to 0.35 | 1.35 to 1.70 | 0.030 max. | 0.030 max. | / | / | / |
STH21 | 0.25 to 0.35 | 0.15 to 0.35 | 0.40 to 0.90 | 0.030 max. | 0.030 max. | 0.25 max | 0.80 to 1.2 | 0.15 to 0.3 |
STH22 | 0.33 to 0.80 | 0.15 to 0.35 | 0.40 to 0.90 | 0.030 max. | 0.030 max. | 0.25 max | 0.80 to 1.2 | 0.15 to 0.3 |
STH31 | 0.35 to 0.40 | 0.10 to 0.50 | 1.20 to 1.50 | 0.030 max. | 0.030 max. | 0.50 to 1.00 | 0.30 to 0.60 | 0.15 to 0.25 |
Appearance
Appearance shall be as follows.
a) Tubes shall be straight and shall have cut-ends square to the tube axis for practical purposes.
b) Both the internal and external surfaces of tubes shall be smoothly finished and free from defects detrimental to use.
c) The tubes may be repaired by grinding, machining or other method, provided that the wall thickness of the product after repair shall be within the range of wall thickness tolerance. However, repair by welding shall not be performed.
d) The surface of the repaired part shall be smooth along the contour of the tube.
Tests
Chemical analysis
Hydrostatic test and non-destructive test
Optional tests
