Các tiêu chuẩn kỹ thuật
- BS 1387-1985 (EN 10255)
- ASTM A53
- KS D 3562 (JIS G 3454)
- KS C 8401 (JIS C 8305)
- KS D 3507 (JIS G 3452)
- KS D 3568 ( JIS G 3466 / ASTM A500)
- API 5CT / API 5L
Qui trình sản xuất
- Pipes for Water Piping, for City & Industrial Water, Irrigation & Agriculture Water
- Pipes for General Ordinary Piping, Oil & Gas Supply, Sprinkler, Fire Hydrant, Ship Piping.
Chemical requirement
| C | Mn | P | S | |
|---|---|---|---|---|
| Light | 0.5 | 1,2 | 0,045 | 0,045 |
| Medium | 0.5 | 1,2 | 0,045 | 0,045 |
| Heavy | 0.5 | 1,2 | 0,045 | 0,045 |
Physical requirement
| Tensile Strength Psi (Mpa) | Yield Strength Psi (Mpa) | Elongation Psi(Mpa) | |
|---|---|---|---|
| Light |
320 ~460 N/mm2 (33~47.2 kg/mm2) |
Min. 195 N/mm2 (20kg/mm2) |
Min. 20 |
| Medium | |||
| Heavy |
Test Requirement
| Flattening test | Bend test | Hydrostatic test | |
|---|---|---|---|
| Light |
Apply for NB>DN50( 2 in. ) Weld portion H=0.75D The other side of Weld Portion H=0.6D (The Weld shall be located at 90 deg.) |
Apply for NB<DN50 Ungavalnized Tubes At Cold 180 Deg.x 6D Galvanized tubes 90Deg.x 8D |
p=53kgf/cm2 (50 bar) |
| Medium | |||
| Heavy |
Permissible variations in dimensions
| Outside Diameter | wall thickness | length | Height of inside flash | |
|---|---|---|---|---|
| Light | Specified respectively in size |
* Random Lengths 4m ~7m * Mill Lengths Min. 6.4m : +150mm, -0 *Approximate Lengths: +- 150mm * Exact Lengths: +6mm, -0 |
||
| Medium | ||||
| Heavy |
