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)
- JIS G 3466 (ASTM A 500)
- KS D 3568 ( JIS G 3466 / ASTM A500)
- API 5CT / API 5L
Qui trình sản xuất
|
Cấp Độ
|
Kích thước danh nghĩa
|
Đường kính ngoài
|
Độ dày
|
Trọng lượng
|
Số ống/bó | ||||||||
|
Max
|
Min
|
Đầu thẳng
|
Ren răng có đầu mối
|
||||||||||
|
in.
|
A
|
in.
|
mm
|
in.
|
mm
|
in.
|
mm
|
kg/ft
|
kg/m
|
kg/ft
|
kg/m
|
||
|
Siêu nhẹ (A1)
|
3/8
|
10
|
0.673
|
17.1
|
0.657
|
16.7
|
0.063
|
1.6
|
0.184
|
0.604
|
0.199
|
0.652
|
217
|
|
1/2
|
15
|
0.843
|
21.4
|
0.827
|
21.0
|
0.075
|
1.9
|
0.276
|
0.904
|
0.281
|
0.922
|
217
|
|
|
3/4
|
20
|
1.059
|
26.9
|
1.039
|
26.4
|
0.083
|
2.1
|
0.388
|
1.274
|
0.395
|
1.296
|
127
|
|
|
1
|
25
|
1.331
|
33.8
|
1.307
|
33.2
|
0.091
|
2.3
|
0.539
|
1.770
|
0.550
|
1.803
|
91
|
|
|
1 1/4
|
32
|
1.673
|
42.5
|
1.650
|
41.9
|
0.091
|
2.3
|
0.690
|
2.263
|
0.701
|
2.301
|
61
|
|
|
1 1/2
|
40
|
1.906
|
48.4
|
1.882
|
47.8
|
0.098
|
2.5
|
0.857
|
2.811
|
0.870
|
2.855
|
61
|
|
|
2
|
50
|
2.370
|
60.2
|
2.346
|
59.6
|
0.079
|
2.0
|
0.871
|
2.856
|
-
|
-
|
37
|
|
|
2
|
50
|
2.370
|
60.2
|
2.346
|
59.6
|
0.102
|
2.6
|
1.120
|
3.674
|
1.136
|
3.726
|
37
|
|
|
2 1/2
|
65
|
2.992
|
76.0
|
2.961
|
75.2
|
0.114
|
2.9
|
1.585
|
5.199
|
1.608
|
5.275
|
37
|
|
|
3
|
|||||||||||||
Download
- 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 |
