Seamless steel pipes are derived from solid steel that is in sheet or bar form and is formed into a solid round shape known as "billets" which are then heated and cast over a form such as a piercing rod to create a hollow tube or shell.The abbreviation of seamless steel pipe is smls pipe.
Standards of seamless steel pipe
| API SPEC 5L |
| Product Name |
Executive Standard |
Dimension (mm) |
Steel Code / Steel Grade |
| Line Pipes |
API 5L |
Ø10.3~1200 x WT1.0~120 |
A, B, X42, X46, X52, X60, X70, X80, PSL1 / PSL2 |
| API SPEC 5CT |
| Product Name |
Executive Standard |
Dimension (mm) |
Steel Code / Steel Grade |
| Casing |
API 5CT |
Ø114~219 x WT5.2~22.2 |
J55, K55, N80, L80, P110 |
| Tubing |
API 5CT |
Ø48.3~114.3 x WT3.2~16 |
J55, K55, N80, L80, P110 |
| ASTM / ASME |
| Product Name |
Executive Standard |
Dimension (mm) |
Steel Code / Steel Grade |
| Black and Hot-Dipped Zinc-Coated Seamless Steel Pipes |
ASTM A53 |
Ø10.3~1200 x WT1.0~150 |
Gr.A, Gr.B, Gr.C |
| Seamless Carbon Steel Pipes for High Temperature Service |
ASTM A106 |
Ø10.3~1200 x WT1.0~150 |
Gr.B, Gr.C |
| Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes |
ASTM A179 |
Ø10.3~426 x WT1.0~36 |
Low Carbon Steel |
| Seamless Carbon Steel Boiler Tubes for High Pressure |
ASTM A192 |
Ø10.3~426 x WT1.0~36 |
Low Carbon Steel |
| Seamless Cold-Drawn Intermediate Alloy Steel Heat-Exchanger and Condenser Tubes |
ASTM A199 |
Ø10.3~426 x 1.0~36 |
T5, T22 |
| Seamless Medium-Carbon Steel Boiler and Superheater Tubes |
ASTM A210 |
Ø10.3~426 x WT1.0~36 |
A1, C |
| Seamless Ferritic & Austenitic Alloy Steel Boiler, Superheater & Heat-Exchanger Tubes |
ASTM A213 |
Ø10.3~426 x WT1.0~36 |
T5, T9, T11, T12, T22, T91 |
| Seamless Carbon and Alloy Steel for Mechanical Tubing |
ASTM A333 |
Ø1/4"~42" x WT SCH20~XXS |
Gr.1, Gr.3, Gr.6 |
| Seamless & Welded Carbon Steel Pipes and Alloy Steel Pipes for Low Temperature Use |
ASTM A334 |
Ø1/4"~4" x WT SCH20~SCH80 |
Gr.1, Gr.6 |
| Seamless Cold-Drawn Carbon Steel Feedwater Heater Tubes |
ASTM A556 |
Ø10.3~426 x WT1.0~36 |
A2, B2 |
| DIN |
| Product Name |
Executive Standard |
Dimension (mm) |
Steel Code / Steel Grade |
| Seamless Steel Tubes for Elevated Temperature |
DIN 17175 |
Ø10~762 x WT1.0~120 |
St35.8, St45.8, 10CrMo910, 15Mo3, 13CrMo44, STPL340, STB410, STB510, WB36 |
| Seamless Steel Tubes |
DIN 1629 / DIN 2391 |
Ø13.5~762 x WT1.8~120 |
St37.0, St44.0, St52.0, St52.3 |
| Seamless Steel Tubes |
DIN 2440 |
Ø13.5~165.1 x WT1.8~4.85 |
St33.2 |
| Seamless Steel Pipes for Structural Purpose |
DIN 2393 |
Ø16~426 x WT1.0~36 |
RSt34-2, RSt37-2, RSt44-2, St52 |
| BS |
| Product Name |
Executive Standard |
Dimension (mm) |
Steel Code / Steel Grade |
| Seamless Steel Tubes for Machine Structure |
BS 970 |
Ø10~762 x WT1.0~120 |
Carbon Steel |
| Seamless Steel Tubes for Boiler and Heat Exchangers |
BS 3059 |
Ø10~762 x WT1.0~120 |
360, 410, 440, 460, 490 |
Specification of seamless steel pipe
Out diameter: 1/2 inch - 36 inch (21.3mm-914.4mm)
Thickness: 2.11mm-60mm ( SCH10, SCH20, SCH40, SCH80, STD, SCH120, SCH160, XXS)
| NOMINAL PIPE SIZE |
OD(mm) |
NOMINAL WALL THICKNESS |
| DN |
NB(inch) |
ASME |
SCH10 |
SCH20 |
SCH30 |
STD |
SCH40 |
SCH60 |
XS |
SCH80 |
SCH100 |
SCH120 |
SCH140 |
SCH160 |
XXS |
| 15 |
1/2" |
21.3 |
2.11 |
|
2.41 |
2.77 |
2.77 |
|
3.73 |
3.73 |
|
|
|
4.78 |
7.47 |
| 20 |
3/4" |
26.7 |
2.11 |
|
2.41 |
2.87 |
2.87 |
|
3.91 |
3.91 |
|
|
|
5.56 |
7.82 |
| 25 |
1" |
33.4 |
2.77 |
|
2.9 |
3.38 |
3.38 |
|
4.55 |
4.55 |
|
|
|
6.35 |
9.09 |
| 32 |
1.1/4" |
42.2 |
2.77 |
|
2.97 |
3.56 |
3.56 |
|
4.85 |
4.85 |
|
|
|
6.35 |
9.7 |
| 40 |
1.1/2" |
48.3 |
2.77 |
|
3.18 |
3.68 |
3.68 |
|
5.08 |
5.08 |
|
|
|
7.14 |
10.15 |
| 50 |
2" |
60.3 |
2.77 |
|
3.18 |
3.91 |
3.91 |
|
5.54 |
5.54 |
|
|
|
8.74 |
11.07 |
| 65 |
2.1/2" |
73 |
3.05 |
|
4.78 |
5.16 |
5.16 |
|
7.01 |
7.01 |
|
|
|
9.53 |
14.02 |
| 80 |
3" |
88.9 |
3.05 |
|
4.78 |
5.49 |
5.49 |
|
7.62 |
7.62 |
|
|
|
11.13 |
15.25 |
| 90 |
3.1/2" |
101.6 |
3.05 |
|
4.78 |
5.74 |
5.74 |
|
8.08 |
8.08 |
|
|
|
|
|
| 100 |
4" |
114.3 |
3.05 |
|
4.78 |
6.02 |
6.02 |
|
8.56 |
8.56 |
|
11.13 |
|
13.49 |
17.12 |
| 125 |
5" |
141.3 |
3.4 |
|
|
6.55 |
6.55 |
|
9.53 |
9.53 |
|
12.7 |
|
15.88 |
19.05 |
| 150 |
6" |
168.3 |
3.4 |
|
|
7.11 |
7.11 |
|
10.97 |
10.97 |
|
14.27 |
|
18.26 |
21.95 |
| 200 |
8" |
219.1 |
3.76 |
6.35 |
7.04 |
8.18 |
8.18 |
10.31 |
12.7 |
12.7 |
15.09 |
18.26 |
20.62 |
23.01 |
22.23 |
| 250 |
10" |
273 |
4.19 |
6.35 |
7.8 |
9.27 |
9.27 |
12.7 |
12.7 |
15.09 |
18.26 |
21.44 |
25.4 |
28.58 |
25.4 |
| 300 |
12" |
323.8 |
4.57 |
6.35 |
8.38 |
9.53 |
10.31 |
14.27 |
12.7 |
17.48 |
21.44 |
25.4 |
28.58 |
33.32 |
25.4 |
| 350 |
14" |
355.6 |
6.35 |
7.92 |
9.53 |
9.53 |
11.13 |
15.09 |
12.7 |
19.05 |
23.83 |
27.79 |
31.75 |
35.71 |
|
| 400 |
16" |
406.4 |
6.35 |
7.92 |
9.53 |
9.53 |
12.7 |
16.66 |
12.7 |
21.44 |
26.19 |
30.96 |
36.53 |
40.19 |
|
| 450 |
18" |
457.2 |
6.35 |
7.92 |
11.13 |
9.53 |
14.27 |
19.05 |
12.7 |
23.83 |
39.36 |
34.93 |
39.67 |
45.24 |
|
| 500 |
20" |
508 |
6.35 |
9.53 |
12.7 |
9.53 |
15.09 |
20.62 |
12.7 |
26.19 |
32.54 |
38.1 |
44.45 |
50.01 |
|
| 550 |
22" |
558.8 |
6.35 |
9.53 |
12.7 |
9.53 |
|
22.23 |
12.7 |
28.58 |
34.93 |
41.28 |
47.63 |
53.98 |
|
| 600 |
24" |
609.6 |
6.35 |
9.53 |
14.27 |
9.53 |
17.48 |
24.61 |
12.7 |
30.96 |
38.89 |
46.02 |
52.37 |
59.54 |
|
| 650 |
26" |
660.4 |
7.92 |
12.7 |
|
9.53 |
|
|
12.7 |
|
|
|
|
|
|
| 700 |
28" |
711.2 |
7.92 |
12.7 |
15.88 |
9.53 |
|
|
12.7 |
|
|
|
|
|
|
| 750 |
30" |
762 |
7.92 |
12.7 |
15.88 |
9.53 |
|
|
12.7 |
|
|
|
|
|
|
| 800 |
32" |
812.8 |
7.92 |
12.7 |
15.88 |
9.53 |
17.48 |
|
12.7 |
|
|
|
|
|
|
| 850 |
34" |
863.6 |
7.92 |
12.7 |
15.88 |
9.53 |
17.48 |
|
12.7 |
|
|
|
|
|
|
| 900 |
36" |
914.4 |
7.92 |
12.7 |
15.88 |
9.53 |
19.05 |
|
12.7 |
|
|
|
|
|
|
