Stainless Steel Seamless Pipe (SMLS Pipe) is fabricated from solid round steel billets through piercing and cold/hot finishing, with zero weld seams. Compared with welded pipes, it boasts smooth inner and outer surfaces, uniform wall thickness and integral structural stability, avoiding weld pores, inclusions and other structural defects.
Featuring outstanding pressure resistance, high-temperature tolerance and corrosion resistance, our seamless pipes adapt to harsh industrial working conditions. We offer OD 1/8"–24" full SCH specifications, customizable lengths of 3.0m–18m, and multiple surface finishes including pickled matte, bright annealing and mirror polishing.
|
Product Name |
Executive Standard |
Dimension |
Steel Code / Steel Grade |
|
Seamless Austenitic Stainless Steel Pipes |
ASTM A312/A312M, ASME SA312/SA312M |
OD: 1/4"–20" |
TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti, TP317, TP317L, TP321, TP321H, TP347, TP347H |
|
WT:SCH5S–SCH80S |
|||
|
Seamless Austenitic Stainless Steel Tubing for General Service |
ASTM A269, ASME SA269 |
OD: 6.0–50.8 mm |
TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti, TP317, TP317L, TP321, TP321H, TP347, TP347H |
|
Seamless Austenitic Alloy-Steel Boiler, Superheater and Heat-Exchanger Tubes |
ASTM A213/A213M, ASME SA213/SA213M |
OD: 6.0–50.8 mm |
TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti, TP317, TP317L, TP321, TP321H, TP347, TP347H |
|
WT: 0.8–10.0 mm |
|||
|
Seamless Duplex Stainless Steel Tubing for General Service |
ASTM A789 / A789M |
OD: 19.0–60.5 mm |
S31803, S32205, S32750 |
|
WT: 1.2–5.0 mm |
|||
|
Seamless Duplex Stainless Steel Pipes |
ASTM A790 / A790M |
OD: 3/4"–10" |
S31803, S32205, S32750 |
|
WT:SCH5S–SCH80S |
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|
Seamless Stainless Steel Mechanical Tubing |
ASTM A511 |
OD: 6.0–50.8 mm |
MT304, MT304L, MT304H, MT310, MT310S, MT316, MT316L, MT317, MT317L, MT321, MT321H, MT347 |
|
WT: 1.8–10.0 mm |
|||
|
Seamless Stainless Steel Tubes for Pressure Purposes |
EN 10216, DIN 17456, DIN 17458 |
OD: 6.0–530.0 mm |
1.4301, 1.4307, 1.4541, 1.4401, 1.4404, 1.4571, 1.4878, 1.4432, 1.4462 |
|
WT: 0.8–34.0 mm |
Standard of stainless steel pipe
|
Standard |
Description |
|
A 213 / SA 213 |
Seamless Ferritic and Austenitic Alloy-steel Boiler, Superheater and Heat-Exchanger Tubes |
|
A 249 / SA 249 |
Welded Austenitic Steel Boiler, Superheater, Heat Exchanger and Condenser Tubes |
|
A 268 / SA 268 |
Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service |
|
A 269 |
Seamless and Welded Austenitic Stainless Steel Tubing for General Service |
|
A 312 / SA 312 |
Seamless, Welded and Heavily Cold Worked Austenitic Stainless Steel Pipes |
|
A 376 / SA 376 |
Seamless Austenitic Steel Pipe for High-temperature Service |
|
A 688 / SA 688 |
Seamless and Welded Austenitic Stainless Steel Feedwater Heater Tubes |
|
A 789 / SA 789 |
Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service |
|
A 790 / SA 790 |
Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe |
|
A 999 / SA 999 |
General Requirement for Alloy and Stainless Steel Pipe |
|
A 1016 / SA 1016 |
General Requirement for Ferritic Alloy Steel, Austenitic Alloy Steel and Stainless Steel Tubes |
|
European Standard |
|
|
DIN EN 10216-5 |
Seamless Steel Tubes for Pressure Purposes |
|
DIN EN 10217-7 |
Welded Steel Tubes for Pressure Purposes |
|
DIN EN 10297-2 |
Seamless Steel Tubes for Mechanical and General Engineering Purposes |
|
DIN EN 10305-1 |
Steel Tubes for Precision Application |
|
German Standard |
|
|
DIN 11850 |
Stainless Steel Tubes for the Food and Chemical Industries—Dimensions, Materials |
|
DIN 17455 |
General Purpose Welded Circular Stainless Steel Tubes |
|
DIN 17456 |
General Purpose Seamless Circular Stainless Steel Tubes |
|
DIN 17457 |
Welded Circular Austenitic Stainless Steel Tubes Subject to Special Requirement |
|
DIN 17458 |
Seamless Circular Austenitic Stainless Steel Tubes Subject to Special Requirement |
|
DIN 28180 |
Seamless Steel Tubes for Heat-exchanger |
|
DIN 11850 |
Welded Tubes and Pipe for Food, Beverages, Chemical & Pharmaceuticals Industry |
|
Russian Standard |
|
|
GOST 9941 |
Seamless and Warm-deformed Tubes Made from Corrosion-resistant Steel |
|
Norsok Standard |
|
|
Norsok M - 650 |
Qualification of Manufacturers of Special Material |
|
Norsok M - 630 |
Material Data Sheets and Element Data Sheets for Piping |
Stainless Steel Seamless Pipe Tolerances
|
NPS Designator |
Permissible Variations in Outside Diameter
|
|
|
Over (in.) |
Under (in.) |
|
|
1/8 to 1-1/2 in. |
1/64 (0.015) |
1/32 (0.031) |
|
Over 1-1/2 to 4 in. |
1/32 (0.031) |
1/32 (0.031) |
|
Over 4 to 8 in. |
1/16 (0.062) |
1/32 (0.031) |
|
Over 8 to 18 in. |
3/32 (0.093) |
1/32 (0.031) |
Below are standard technical tables for stainless steel seamless pipes, covering chemical composition, heat treatment specifications, and tensile mechanical properties. All data complies with ASTM standards for each steel grade.
Chemical composition defines element content ranges to guarantee corrosion resistance and material purity. Heat treatment standards control annealing processes to stabilize internal microstructure and improve high-temperature performance.
Tensile data shows standardized strength and elongation values, ensuring reliable mechanical performance, pressure resistance and ductility. All technical indicators are traceable and support third-party inspection for industrial high-standard applications.
Chemical Requirements (%)
|
Grade |
UNS |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Mb |
Ti |
Nb |
Ta |
N |
Vn |
Cu |
Ce |
B |
Al |
Other |
|
TP304 |
S30400 |
0.08 |
2 |
0.045 |
0.03 |
1 |
18.0–20 |
8.0–11 |
... |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP304L |
S30403 |
0.035 |
2 |
0.045 |
0.03 |
1 |
18.0–20 |
8.0–13 |
... |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP304H |
S30409 |
0.04–0.1 |
2 |
0.045 |
0.03 |
1 |
18.0–20 |
8.0–11 |
... |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP310S |
S31008 |
0.08 |
2 |
0.045 |
0.03 |
1 |
24.0–26 |
19.0–22 |
0.75 |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP310H |
S31009 |
0.04–0.1 |
2 |
0.045 |
0.03 |
1 |
24.0–26 |
19.0–22 |
... |
... |
... |
... |
... |
... |
|
... |
|
|
|
|
TP310H |
S31035 |
0.04–0.1 |
0.6 |
0.025 |
0.015 |
0.4 |
21.5–23.5 |
23.5–26.5 |
... |
... |
0.40–0.6 |
... |
0.20–0.3 |
... |
2.5–3.5 |
... |
0.002–0.008 |
|
See Spec |
|
TP316 |
S31600 |
0.08 |
2 |
0.045 |
0.03 |
1 |
16.0–18 |
10.0–14 |
2.00–3 |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP316L |
S31603 |
0.035 |
2 |
0.045 |
0.03 |
1 |
16.0–18 |
10.0–14 |
2.00–3 |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP316H |
S31609 |
0.04–0.1 |
2 |
0.045 |
0.03 |
1 |
16.0–18 |
10.0–14 |
2.00–3 |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP317 |
S31700 |
0.08 |
2 |
0.045 |
0.03 |
1 |
18.0–20 |
11.0–15 |
3.0–4 |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP317L |
S31703 |
0.035 |
2 |
0.045 |
0.03 |
1 |
18.0–20 |
11.0–15 |
3.0–4 |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP321 |
S32100 |
0.08 |
2 |
0.045 |
0.03 |
1 |
17.0–19 |
9.0–12 |
... |
Ti 5 × (C+N) min; |
... |
... |
0.1 |
... |
... |
... |
|
|
|
|
TP321H |
S32109 |
0.04–0.1 |
2 |
0.045 |
0.03 |
1 |
17.0–19 |
9.0–12 |
... |
4(C+N) min; |
... |
... |
0.1 |
... |
... |
... |
|
|
|
|
TP321H |
S32654 |
0.02 |
2.0–4 |
0.03 |
0.005 |
0.5 |
24.0–25 |
21.0–23 |
7.0–8 |
... |
... |
... |
0.45–0.55 |
... |
0.30–0.6 |
... |
|
|
|
|
TP321H |
S33228 |
0.04–0.08 |
1 |
0.02 |
0.015 |
0.3 |
26.0–28 |
31.0–33 |
... |
... |
0.60–1 |
... |
... |
... |
... |
0.05–0.1 |
|
0.025 |
|
|
TP321H |
S34565 |
0.03 |
5.0–7 |
0.03 |
0.01 |
1 |
23.0–25 |
16.0–18 |
4.0–5 |
... |
0.1 |
... |
0.40–0.6 |
... |
... |
... |
|
|
|
|
TP347 |
S34700 |
0.08 |
2 |
0.045 |
0.03 |
1 |
17.0–19 |
9.0–13 |
... |
... |
See Spec |
... |
... |
... |
... |
... |
|
|
|
|
TP347H |
S34709 |
0.04–0.1 |
2 |
0.045 |
0.03 |
1 |
17.0–19 |
9.0–13 |
... |
... |
See Spec |
... |
... |
... |
... |
... |
|
|
|
|
Alloy 20 |
N08020 |
0.07 |
2 |
0.045 |
0.035 |
1 |
19.0–21 |
32.0–38 |
2.0–3 |
... |
See Spec |
See Spec |
... |
... |
3.0–4 |
... |
... |
... |
|
|
Alloy 20 |
N08367 |
0.03 |
2 |
0.04 |
0.03 |
1 |
20.0–22 |
23.5–25.5 |
6.0–7 |
... |
... |
... |
0.18–0.25 |
... |
0.75 |
... |
... |
... |
|
|
Alloy 20 |
N08028 |
0.03 |
2.5 |
0.03 |
0.03 |
1 |
26.0–28 |
30.0–34 |
3.0–4 |
|
|
|
|
|
0.60–1.4 |
|
|
|
|
|
Alloy 20 |
N08029 |
0.02 |
2 |
0.025 |
0.015 |
0.6 |
26.0–28 |
30.0–34 |
4.0–5 |
|
|
|
|
|
0.6–1.4 |
|
|
|
|
Heat treatment chart of stainless steel pipe
|
Grade |
UNS Designation |
Finish |
Heating Temperature |
|
TP304H |
S30409, S30415 |
Cold |
1900 °F [1040 °C] |
|
TP304H |
S30409, S30415 |
Hot |
1900 °F [1040 °C] |
|
TP310H |
S31009 |
|
1900 °F [1040 °C] |
|
TP310H |
S31035 |
|
2160–2280 °F [1180–1250 °C] |
|
TP316H |
S31609 |
Cold |
1900 °F [1040 °C] |
|
TP316H |
S31610 |
Hot |
1900 °F [1040 °C] |
|
TP321H |
S32109, S32615 |
Cold |
2000 °F [1100 °C] |
|
TP321H |
S32109, S32615 |
Hot |
1925 °F [1050 °C] |
|
TP321H |
S32654 |
|
2100 °F [1150 °C] |
|
TP321H |
S33228 |
|
2050–2160 °F [1120–1180 °C] |
|
TP321H |
S34565 |
|
2050–2140 °F [1120–1170 °C] |
|
TP347H |
S34709 |
Cold |
2000 °F [1100 °C] |
|
TP347H |
S34709 |
Hot |
1925 °F [1050 °C] |
|
Alloy 20 |
N08020 |
|
1700–1850 °F [925–1010 °C] |
|
Alloy 20 |
N08367 |
|
2025 °F [1110 °C] |
|
Alloy 20 |
N08028 |
|
2000 °F [1100 °C] |
|
Alloy 20 |
N08029 |
|
2000 °F [1100 °C] |
|
Grade |
UNS Designation |
Tensile Strength, min ksi [MPa] |
Yield Strength, min ksi [MPa] |
Other |
|
TP304 |
S30400 |
75 [515] |
30 [205] |
|
|
TP304L |
S30403 |
70 [485] |
25 [170] |
|
|
TP304H |
S30409 |
75 [515] |
30 [205] |
|
|
TP304H |
S30415 |
87 [600] |
42 [290] |
|
|
TP310S |
S31008 |
75 [515] |
30 [205] |
|
|
TP310H |
S31009 |
75 [515] |
30 [205] |
|
|
TP310H |
S31035 |
95 [655] |
45 [310] |
|
|
TP316 |
S31600 |
75 [515] |
30 [205] |
|
|
TP316L |
S31603 |
70 [485] |
25 [170] |
|
|
TP316H |
S31609 |
75 [515] |
30 [205] |
|
|
TP316H |
S31635 |
75 [515] |
30 [205] |
|
|
TP317 |
S31700 |
75 [515] |
30 [205] |
|
|
TP317L |
S31703 |
75 [515] |
30 [205] |
|
|
TP317L |
S31725 |
75 [515] |
30 [205] |
|
|
TP317L |
S31726 |
80 [550] |
35 [240] |
|
|
TP317L |
S31727 |
80 [550] |
36 [245] |
|
|
TP317L |
S31730 |
70 [480] |
25 [175] |
|
|
TP317L |
S32053 |
93 [640] |
43 [295] |
|
|
TP321 |
S32100 |
75 [515] |
30 [205] |
welded & seamless |
|
TP321 |
S32100 |
75 [515] |
30 [205] |
t = 0.375 in. |
|
TP321 |
S32100 |
70 [480] |
25 [170] |
t > 0.375 in. |
|
TP321H |
S32109 |
75 [515] |
30 [205] |
welded & seamless |
|
TP321H |
S32109 |
75 [515] |
30 [205] |
t = 0.375 in. |
|
TP321H |
S32109 |
70 [480] |
25 [170] |
t > 0.375 in. |
|
TP321H |
S32615 |
80 [550] |
32 [320] |
|
|
TP321H |
S32654 |
109 [750] |
62 [430] |
|
|
TP321H |
S33228 |
73 [500] |
27 [185] |
|
|
TP321H |
S34565 |
115 [795] |
60 [415] |
|
|
TP347 |
S34700 |
75 [515] |
30 [205] |
|
|
TP347H |
S34709 |
75 [515] |
30 [205] |
|
|
Alloy 20 |
N08020 |
80 [550] |
35 [240] |
|
|
Alloy 20 |
N08028 |
73 [500] |
31 [214] |
|
|
Alloy 20 |
N08029 |
73 [500] |
31 [214] |
|
|
Alloy 20 |
N08367 |
100 [690] |
45 [310] |
t = 0.187 in. |
|
Alloy 20 |
N08367 |
95 [655] |
45 [310] |
t > 0.187 in. |
Specification of Stainless Seamless Pipe
|
NB |
Size |
OD mm |
40S mm |
5S mm |
10S mm |
S 10 mm |
S 20 mm |
S 40 mm |
S 60 mm |
XS/80S mm |
S 80 mm |
S 100 mm |
S 120 mm |
S 140 mm |
S 160 mm |
XXS mm |
|
1/8” |
10.29 |
1.24 |
1.73 |
2.41 |
||||||||||||
|
1/4” |
13.72 |
1.65 |
2.24 |
3.02 |
||||||||||||
|
3/8” |
17.15 |
1.65 |
2.31 |
3.20 |
||||||||||||
|
15 |
1/2” |
21.34 |
2.77 |
1.65 |
2.11 |
2.77 |
3.73 |
3.73 |
4.78 |
7.47 |
||||||
|
20 |
3/4” |
26.67 |
2.87 |
1.65 |
2.11 |
2.87 |
3.91 |
3.91 |
5.56 |
7.82 |
||||||
|
25 |
1” |
33.40 |
3.38 |
1.65 |
2.77 |
3.38 |
4.55 |
4.55 |
6.35 |
9.09 |
||||||
|
32 |
1 1/4” |
42.16 |
3.56 |
1.65 |
2.77 |
3.56 |
4.85 |
4.85 |
6.35 |
9.70 |
||||||
|
40 |
1 1/2” |
48.26 |
3.68 |
1.65 |
2.77 |
3.68 |
5.08 |
5.08 |
7.14 |
10.15 |
||||||
|
50 |
2” |
60.33 |
3.91 |
1.65 |
2.77 |
3.91 |
5.54 |
5.54 |
9.74 |
11.07 |
||||||
|
65 |
2 1/2” |
73.03 |
5.16 |
2.11 |
3.05 |
5.16 |
7.01 |
7.01 |
9.53 |
14.02 |
||||||
|
80 |
3” |
88.90 |
5.49 |
2.11 |
3.05 |
5.49 |
7.62 |
7.62 |
11.13 |
15.24 |
||||||
|
90 |
3 1/2” |
101.60 |
5.74 |
2.11 |
3.05 |
5.74 |
8.08 |
8.08 |
||||||||
|
100 |
4” |
114.30 |
6.02 |
2.11 |
3.05 |
6.02 |
8.56 |
8.56 |
11.12 |
13.49 |
17.12 |
|||||
|
125 |
5” |
141.30 |
6.55 |
2.77 |
3.40 |
6.55 |
9.53 |
9.53 |
12.70 |
15.88 |
19.05 |
|||||
|
150 |
6” |
168.27 |
7.11 |
2.77 |
3.40 |
7.11 |
10.97 |
10.97 |
14.27 |
18.26 |
21.95 |
|||||
|
200 |
8” |
219.08 |
8.18 |
2.77 |
3.76 |
6.35 |
8.18 |
10.31 |
12.70 |
12.70 |
15.09 |
19.26 |
20.62 |
23.01 |
22.23 |
|
|
250 |
10” |
273.05 |
9.27 |
3.40 |
4.19 |
6.35 |
9.27 |
12.70 |
12.70 |
15.09 |
19.26 |
21.44 |
25.40 |
28.58 |
25.40 |
|
|
300 |
12” |
323.85 |
9.53 |
3.96 |
4.57 |
6.35 |
10.31 |
14.27 |
12.70 |
17.48 |
21.44 |
25.40 |
28.58 |
33.32 |
25.40 |
|
|
350 |
14” |
355.60 |
9.53 |
3.96 |
4.78 |
6.35 |
7.92 |
11.13 |
15.09 |
12.70 |
19.05 |
23.83 |
27.79 |
31.75 |
35.71 |
|
|
400 |
16” |
406.40 |
9.53 |
4.19 |
4.78 |
6.35 |
7.92 |
12.70 |
16.66 |
12.70 |
21.44 |
26.19 |
30.96 |
36.53 |
40.49 |
|
|
450 |
18” |
457.20 |
9.53 |
4.19 |
4.78 |
6.35 |
7.92 |
14.27 |
19.05 |
12.70 |
23.83 |
29.36 |
34.93 |
39.67 |
45.24 |
|
|
500 |
20” |
508.00 |
9.53 |
4.78 |
5.54 |
6.35 |
9.53 |
15.09 |
20.62 |
12.70 |
26.19 |
32.54 |
38.10 |
44.45 |
50.01 |
|
|
550 |
22” |
558.80 |
9.53 |
4.78 |
5.54 |
6.35 |
9.53 |
22.23 |
12.70 |
28.58 |
34.93 |
41.28 |
47.63 |
53.98 |
||
|
600 |
24” |
609.60 |
9.53 |
5.54 |
6.35 |
6.35 |
9.53 |
17.48 |
24.61 |
12.70 |
30.96 |
38.89 |
46.02 |
52.37 |
59.54 |
|
|
650 |
26” |
660.40 |
9.53 |
7.92 |
12.70 |
12.70 |
||||||||||
|
700 |
28” |
711.20 |
9.53 |
7.92 |
12.70 |
12.70 |
||||||||||
|
750 |
30” |
762.00 |
9.53 |
6.35 |
7.92 |
7.92 |
12.70 |
12.70 |
||||||||
|
800 |
32” |
812.80 |
9.53 |
7.92 |
12.70 |
17.48 |
12.70 |
|||||||||
|
850 |
34” |
863.60 |
9.53 |
7.92 |
12.70 |
17.48 |
12.70 |
|||||||||
|
900 |
36” |
914.40 |
9.53 |
7.92 |
12.70 |
19.05 |
12.70 |
Stainless steel seamless pipes are primarily manufactured by three core methods: extruding, gun drilling, and piercing. The extrusion process provides the most uniform OD and concentric ID, and is uniquely suitable for producing long-length seamless stainless steel coil tubing. Our complete standardized production process includes raw material preprocessing, cold forming, heat treatment, surface treatment, precision polishing and rigorous quality inspection, ensuring dimensionally stable, high-strength and corrosion-resistant pipes compliant with ASTM standards.
1.Raw Material Preparation Premium 304 and 316L stainless steel billets are selected and processed by hollowing, heading and preliminary annealing to ensure stable forming quality.Cold Rolling & Drawing Forming Preprocessed billets adopt multi-pass cold rolling and cold drawing on professional mills. Variable-section rolling guarantees uniform wall thickness and precise dimensional tolerance.
2.Heat Treatment & Straightening Cold-worked pipes are hardened with poor ductility. Bright annealing, demagnetization and straightening are applied to optimize internal microstructure and meet industrial and sanitary standards.
3.Pickling & Passivation Integrated pickling and passivation removes surface oil, rust, oxide layers and free iron. It creates a uniform passive surface, avoids hydrogen embrittlement, and greatly enhances corrosion resistance.
4.High-Precision Polishing Inner and outer pipe walls are polished with standard 400-mesh finish, achieving mirror-grade smooth and sanitary surfaces for high-standard industrial applications.
6. Quality Inspection & Packaging Finished pipes undergo strict NDT flaw detection, hydrostatic testing and manual screening. Only fully qualified products are packaged and delivered to ensure stable and reliable performance.
Below are standard technical tables for stainless steel seamless pipes, covering chemical composition, heat treatment specifications, and tensile mechanical properties. All data complies with ASTM standards for each steel grade.
Chemical composition defines element content ranges to guarantee corrosion resistance and material purity. Heat treatment standards control annealing processes to stabilize internal microstructure and improve high-temperature performance.
Tensile data shows standardized strength and elongation values, ensuring reliable mechanical performance, pressure resistance and ductility. All technical indicators are traceable and support third-party inspection for industrial high-standard applications.
Chemical Requirements (%)
|
Grade |
UNS |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Mb |
Ti |
Nb |
Ta |
N |
Vn |
Cu |
Ce |
B |
Al |
Other |
|
TP304 |
S30400 |
0.08 |
2 |
0.045 |
0.03 |
1 |
18.0–20 |
8.0–11 |
... |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP304L |
S30403 |
0.035 |
2 |
0.045 |
0.03 |
1 |
18.0–20 |
8.0–13 |
... |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP304H |
S30409 |
0.04–0.1 |
2 |
0.045 |
0.03 |
1 |
18.0–20 |
8.0–11 |
... |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP310S |
S31008 |
0.08 |
2 |
0.045 |
0.03 |
1 |
24.0–26 |
19.0–22 |
0.75 |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP310H |
S31009 |
0.04–0.1 |
2 |
0.045 |
0.03 |
1 |
24.0–26 |
19.0–22 |
... |
... |
... |
... |
... |
... |
|
... |
|
|
|
|
TP310H |
S31035 |
0.04–0.1 |
0.6 |
0.025 |
0.015 |
0.4 |
21.5–23.5 |
23.5–26.5 |
... |
... |
0.40–0.6 |
... |
0.20–0.3 |
... |
2.5–3.5 |
... |
0.002–0.008 |
|
See Spec |
|
TP316 |
S31600 |
0.08 |
2 |
0.045 |
0.03 |
1 |
16.0–18 |
10.0–14 |
2.00–3 |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP316L |
S31603 |
0.035 |
2 |
0.045 |
0.03 |
1 |
16.0–18 |
10.0–14 |
2.00–3 |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP316H |
S31609 |
0.04–0.1 |
2 |
0.045 |
0.03 |
1 |
16.0–18 |
10.0–14 |
2.00–3 |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP317 |
S31700 |
0.08 |
2 |
0.045 |
0.03 |
1 |
18.0–20 |
11.0–15 |
3.0–4 |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP317L |
S31703 |
0.035 |
2 |
0.045 |
0.03 |
1 |
18.0–20 |
11.0–15 |
3.0–4 |
... |
... |
... |
... |
... |
... |
... |
|
|
|
|
TP321 |
S32100 |
0.08 |
2 |
0.045 |
0.03 |
1 |
17.0–19 |
9.0–12 |
... |
Ti 5 × (C+N) min; |
... |
... |
0.1 |
... |
... |
... |
|
|
|
|
TP321H |
S32109 |
0.04–0.1 |
2 |
0.045 |
0.03 |
1 |
17.0–19 |
9.0–12 |
... |
4(C+N) min; |
... |
... |
0.1 |
... |
... |
... |
|
|
|
|
TP321H |
S32654 |
0.02 |
2.0–4 |
0.03 |
0.005 |
0.5 |
24.0–25 |
21.0–23 |
7.0–8 |
... |
... |
... |
0.45–0.55 |
... |
0.30–0.6 |
... |
|
|
|
|
TP321H |
S33228 |
0.04–0.08 |
1 |
0.02 |
0.015 |
0.3 |
26.0–28 |
31.0–33 |
... |
... |
0.60–1 |
... |
... |
... |
... |
0.05–0.1 |
|
0.025 |
|
|
TP321H |
S34565 |
0.03 |
5.0–7 |
0.03 |
0.01 |
1 |
23.0–25 |
16.0–18 |
4.0–5 |
... |
0.1 |
... |
0.40–0.6 |
... |
... |
... |
|
|
|
|
TP347 |
S34700 |
0.08 |
2 |
0.045 |
0.03 |
1 |
17.0–19 |
9.0–13 |
... |
... |
See Spec |
... |
... |
... |
... |
... |
|
|
|
|
TP347H |
S34709 |
0.04–0.1 |
2 |
0.045 |
0.03 |
1 |
17.0–19 |
9.0–13 |
... |
... |
See Spec |
... |
... |
... |
... |
... |
|
|
|
|
Alloy 20 |
N08020 |
0.07 |
2 |
0.045 |
0.035 |
1 |
19.0–21 |
32.0–38 |
2.0–3 |
... |
See Spec |
See Spec |
... |
... |
3.0–4 |
... |
... |
... |
|
|
Alloy 20 |
N08367 |
0.03 |
2 |
0.04 |
0.03 |
1 |
20.0–22 |
23.5–25.5 |
6.0–7 |
... |
... |
... |
0.18–0.25 |
... |
0.75 |
... |
... |
... |
|
|
Alloy 20 |
N08028 |
0.03 |
2.5 |
0.03 |
0.03 |
1 |
26.0–28 |
30.0–34 |
3.0–4 |
|
|
|
|
|
0.60–1.4 |
|
|
|
|
|
Alloy 20 |
N08029 |
0.02 |
2 |
0.025 |
0.015 |
0.6 |
26.0–28 |
30.0–34 |
4.0–5 |
|
|
|
|
|
0.6–1.4 |
|
|
|
|
Heat treatment chart of stainless steel pipe
|
Grade |
UNS Designation |
Finish |
Heating Temperature |
|
TP304H |
S30409, S30415 |
Cold |
1900 °F [1040 °C] |
|
TP304H |
S30409, S30415 |
Hot |
1900 °F [1040 °C] |
|
TP310H |
S31009 |
|
1900 °F [1040 °C] |
|
TP310H |
S31035 |
|
2160–2280 °F [1180–1250 °C] |
|
TP316H |
S31609 |
Cold |
1900 °F [1040 °C] |
|
TP316H |
S31610 |
Hot |
1900 °F [1040 °C] |
|
TP321H |
S32109, S32615 |
Cold |
2000 °F [1100 °C] |
|
TP321H |
S32109, S32615 |
Hot |
1925 °F [1050 °C] |
|
TP321H |
S32654 |
|
2100 °F [1150 °C] |
|
TP321H |
S33228 |
|
2050–2160 °F [1120–1180 °C] |
|
TP321H |
S34565 |
|
2050–2140 °F [1120–1170 °C] |
|
TP347H |
S34709 |
Cold |
2000 °F [1100 °C] |
|
TP347H |
S34709 |
Hot |
1925 °F [1050 °C] |
|
Alloy 20 |
N08020 |
|
1700–1850 °F [925–1010 °C] |
|
Alloy 20 |
N08367 |
|
2025 °F [1110 °C] |
|
Alloy 20 |
N08028 |
|
2000 °F [1100 °C] |
|
Alloy 20 |
N08029 |
|
2000 °F [1100 °C] |
|
Grade |
UNS Designation |
Tensile Strength, min ksi [MPa] |
Yield Strength, min ksi [MPa] |
Other |
|
TP304 |
S30400 |
75 [515] |
30 [205] |
|
|
TP304L |
S30403 |
70 [485] |
25 [170] |
|
|
TP304H |
S30409 |
75 [515] |
30 [205] |
|
|
TP304H |
S30415 |
87 [600] |
42 [290] |
|
|
TP310S |
S31008 |
75 [515] |
30 [205] |
|
|
TP310H |
S31009 |
75 [515] |
30 [205] |
|
|
TP310H |
S31035 |
95 [655] |
45 [310] |
|
|
TP316 |
S31600 |
75 [515] |
30 [205] |
|
|
TP316L |
S31603 |
70 [485] |
25 [170] |
|
|
TP316H |
S31609 |
75 [515] |
30 [205] |
|
|
TP316H |
S31635 |
75 [515] |
30 [205] |
|
|
TP317 |
S31700 |
75 [515] |
30 [205] |
|
|
TP317L |
S31703 |
75 [515] |
30 [205] |
|
|
TP317L |
S31725 |
75 [515] |
30 [205] |
|
|
TP317L |
S31726 |
80 [550] |
35 [240] |
|
|
TP317L |
S31727 |
80 [550] |
36 [245] |
|
|
TP317L |
S31730 |
70 [480] |
25 [175] |
|
|
TP317L |
S32053 |
93 [640] |
43 [295] |
|
|
TP321 |
S32100 |
75 [515] |
30 [205] |
welded & seamless |
|
TP321 |
S32100 |
75 [515] |
30 [205] |
t = 0.375 in. |
|
TP321 |
S32100 |
70 [480] |
25 [170] |
t > 0.375 in. |
|
TP321H |
S32109 |
75 [515] |
30 [205] |
welded & seamless |
|
TP321H |
S32109 |
75 [515] |
30 [205] |
t = 0.375 in. |
|
TP321H |
S32109 |
70 [480] |
25 [170] |
t > 0.375 in. |
|
TP321H |
S32615 |
80 [550] |
32 [320] |
|
|
TP321H |
S32654 |
109 [750] |
62 [430] |
|
|
TP321H |
S33228 |
73 [500] |
27 [185] |
|
|
TP321H |
S34565 |
115 [795] |
60 [415] |
|
|
TP347 |
S34700 |
75 [515] |
30 [205] |
|
|
TP347H |
S34709 |
75 [515] |
30 [205] |
|
|
Alloy 20 |
N08020 |
80 [550] |
35 [240] |
|
|
Alloy 20 |
N08028 |
73 [500] |
31 [214] |
|
|
Alloy 20 |
N08029 |
73 [500] |
31 [214] |
|
|
Alloy 20 |
N08367 |
100 [690] |
45 [310] |
t = 0.187 in. |
|
Alloy 20 |
N08367 |
95 [655] |
45 [310] |
t > 0.187 in. |
Specification of Stainless Seamless Pipe
|
NB |
Size |
OD mm |
40S mm |
5S mm |
10S mm |
S 10 mm |
S 20 mm |
S 40 mm |
S 60 mm |
XS/80S mm |
S 80 mm |
S 100 mm |
S 120 mm |
S 140 mm |
S 160 mm |
XXS mm |
|
1/8” |
10.29 |
1.24 |
1.73 |
2.41 |
||||||||||||
|
1/4” |
13.72 |
1.65 |
2.24 |
3.02 |
||||||||||||
|
3/8” |
17.15 |
1.65 |
2.31 |
3.20 |
||||||||||||
|
15 |
1/2” |
21.34 |
2.77 |
1.65 |
2.11 |
2.77 |
3.73 |
3.73 |
4.78 |
7.47 |
||||||
|
20 |
3/4” |
26.67 |
2.87 |
1.65 |
2.11 |
2.87 |
3.91 |
3.91 |
5.56 |
7.82 |
||||||
|
25 |
1” |
33.40 |
3.38 |
1.65 |
2.77 |
3.38 |
4.55 |
4.55 |
6.35 |
9.09 |
||||||
|
32 |
1 1/4” |
42.16 |
3.56 |
1.65 |
2.77 |
3.56 |
4.85 |
4.85 |
6.35 |
9.70 |
||||||
|
40 |
1 1/2” |
48.26 |
3.68 |
1.65 |
2.77 |
3.68 |
5.08 |
5.08 |
7.14 |
10.15 |
||||||
|
50 |
2” |
60.33 |
3.91 |
1.65 |
2.77 |
3.91 |
5.54 |
5.54 |
9.74 |
11.07 |
||||||
|
65 |
2 1/2” |
73.03 |
5.16 |
2.11 |
3.05 |
5.16 |
7.01 |
7.01 |
9.53 |
14.02 |
||||||
|
80 |
3” |
88.90 |
5.49 |
2.11 |
3.05 |
5.49 |
7.62 |
7.62 |
11.13 |
15.24 |
||||||
|
90 |
3 1/2” |
101.60 |
5.74 |
2.11 |
3.05 |
5.74 |
8.08 |
8.08 |
||||||||
|
100 |
4” |
114.30 |
6.02 |
2.11 |
3.05 |
6.02 |
8.56 |
8.56 |
11.12 |
13.49 |
17.12 |
|||||
|
125 |
5” |
141.30 |
6.55 |
2.77 |
3.40 |
6.55 |
9.53 |
9.53 |
12.70 |
15.88 |
19.05 |
|||||
|
150 |
6” |
168.27 |
7.11 |
2.77 |
3.40 |
7.11 |
10.97 |
10.97 |
14.27 |
18.26 |
21.95 |
|||||
|
200 |
8” |
219.08 |
8.18 |
2.77 |
3.76 |
6.35 |
8.18 |
10.31 |
12.70 |
12.70 |
15.09 |
19.26 |
20.62 |
23.01 |
22.23 |
|
|
250 |
10” |
273.05 |
9.27 |
3.40 |
4.19 |
6.35 |
9.27 |
12.70 |
12.70 |
15.09 |
19.26 |
21.44 |
25.40 |
28.58 |
25.40 |
|
|
300 |
12” |
323.85 |
9.53 |
3.96 |
4.57 |
6.35 |
10.31 |
14.27 |
12.70 |
17.48 |
21.44 |
25.40 |
28.58 |
33.32 |
25.40 |
|
|
350 |
14” |
355.60 |
9.53 |
3.96 |
4.78 |
6.35 |
7.92 |
11.13 |
15.09 |
12.70 |
19.05 |
23.83 |
27.79 |
31.75 |
35.71 |
|
|
400 |
16” |
406.40 |
9.53 |
4.19 |
4.78 |
6.35 |
7.92 |
12.70 |
16.66 |
12.70 |
21.44 |
26.19 |
30.96 |
36.53 |
40.49 |
|
|
450 |
18” |
457.20 |
9.53 |
4.19 |
4.78 |
6.35 |
7.92 |
14.27 |
19.05 |
12.70 |
23.83 |
29.36 |
34.93 |
39.67 |
45.24 |
|
|
500 |
20” |
508.00 |
9.53 |
4.78 |
5.54 |
6.35 |
9.53 |
15.09 |
20.62 |
12.70 |
26.19 |
32.54 |
38.10 |
44.45 |
50.01 |
|
|
550 |
22” |
558.80 |
9.53 |
4.78 |
5.54 |
6.35 |
9.53 |
22.23 |
12.70 |
28.58 |
34.93 |
41.28 |
47.63 |
53.98 |
||
|
600 |
24” |
609.60 |
9.53 |
5.54 |
6.35 |
6.35 |
9.53 |
17.48 |
24.61 |
12.70 |
30.96 |
38.89 |
46.02 |
52.37 |
59.54 |
|
|
650 |
26” |
660.40 |
9.53 |
7.92 |
12.70 |
12.70 |
||||||||||
|
700 |
28” |
711.20 |
9.53 |
7.92 |
12.70 |
12.70 |
||||||||||
|
750 |
30” |
762.00 |
9.53 |
6.35 |
7.92 |
7.92 |
12.70 |
12.70 |
||||||||
|
800 |
32” |
812.80 |
9.53 |
7.92 |
12.70 |
17.48 |
12.70 |
|||||||||
|
850 |
34” |
863.60 |
9.53 |
7.92 |
12.70 |
17.48 |
12.70 |
|||||||||
|
900 |
36” |
914.40 |
9.53 |
7.92 |
12.70 |
19.05 |
12.70 |
Stainless steel seamless pipes are primarily manufactured by three core methods: extruding, gun drilling, and piercing. The extrusion process provides the most uniform OD and concentric ID, and is uniquely suitable for producing long-length seamless stainless steel coil tubing. Our complete standardized production process includes raw material preprocessing, cold forming, heat treatment, surface treatment, precision polishing and rigorous quality inspection, ensuring dimensionally stable, high-strength and corrosion-resistant pipes compliant with ASTM standards.
1.Raw Material Preparation Premium 304 and 316L stainless steel billets are selected and processed by hollowing, heading and preliminary annealing to ensure stable forming quality.Cold Rolling & Drawing Forming Preprocessed billets adopt multi-pass cold rolling and cold drawing on professional mills. Variable-section rolling guarantees uniform wall thickness and precise dimensional tolerance.
2.Heat Treatment & Straightening Cold-worked pipes are hardened with poor ductility. Bright annealing, demagnetization and straightening are applied to optimize internal microstructure and meet industrial and sanitary standards.
3.Pickling & Passivation Integrated pickling and passivation removes surface oil, rust, oxide layers and free iron. It creates a uniform passive surface, avoids hydrogen embrittlement, and greatly enhances corrosion resistance.
4.High-Precision Polishing Inner and outer pipe walls are polished with standard 400-mesh finish, achieving mirror-grade smooth and sanitary surfaces for high-standard industrial applications.
6. Quality Inspection & Packaging Finished pipes undergo strict NDT flaw detection, hydrostatic testing and manual screening. Only fully qualified products are packaged and delivered to ensure stable and reliable performance.
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