Stainless steel seamless pipe, also known as stainless steel seamless tube, is a long hollow cylinder used for moving fluids (liquids or gases).
“Stainless seamless pipe” and “stainless steel tube” are almost interchangeable, although minor distinctions exist-generally, a tube has tighter engineering requirements than a pipe.
Cepheus is a professional manufacturer specialized in manufacturing seamless pipes in large, medium, and small diameters.
Various stainless steel seamless pipe are produced with complete specifications and supreme quality.
Cepheus has fine equipment and complete quality management, establishes modern quality management system, introduces internationally advanced technology and adopts international advanced production technique.
Stainless steel seamless pipe are widely used in such industries as petroleum, chemical industry, machinery, electric power, chemical fiber, papermaking, printing and dyeing, food and pneumatic parts etc.
The company is provided with complete inspection equipment and adopts technical standards for products such as: seamless pipe for fluid transportation, seamless pipe for construction, seamless for boiler and heat exchanger.
The outside diameter of seamless stainless we produce ranges from 4.0mm to 1219mm. The wall thickness is 0.5mm to 100mm. For metal, we are serious.
| Specification | |
| Size | OD: 4.0 ~ 1219mm; WT: 0.5 ~ 100mm; Length: 6m, 12m, Max.18m |
| Process | Seamless, Cold Drawn, Cold Rolled, Hot Rolled |
| End | PE(Plain End), BE(Beveled End), NPT, BW(Butt Weld End) |
| Surface | Aid Pickling, Polishing(180#, 220#, 240#, 320#, 400#, 600#) |
| Theoretical Weight(kg/m) | Weight/meter = (OD-WT)*WT*0.02507 Both OD and WT in mm. |
Note:
OD is the specified outside diameter.
WT is the specified wall thickness
Stainless steel pipes shall be pickled free of scale. When bright annealing is used, pickling is not necessary.
Main Grades
| Austenitic/Super Austenitic Stainless Steel Seamless Pipe | 304, 304H, 304L, 304LN, 321, 321H, 316, 316L, 316LN, 316Ti, 317L, 310S, 310H, 314, 347H, 904L, S31254, N08367, N08926, S32654, S31277 |
| Ferrite/Super Ferrite Stainless Steel Seamless Pipe | 405, 430, 439, 444, TP446-1/TP446-2, S44660, S44735, S44736 |
| Duplex/Super Duplex Stainless Steel Seamless Pipe | S31500, S31803, S32205, S32304, S32520， S32550, S32750, S32760 |
| Martensite/Super Martensite Stainless Steel Seamless Pipe | 410S, 410, 420, 420J2, 431, 17-4PH, 13Cr110, 17Cr110/125 |
| Nickel Alloy Seamless Pipe | N04400, N05500, N06600, N06601, N06025, N06617, N06625, N06690, N08810, N10276, N06022, N10665, N10675, N08020, N08028, N08031, N06985, N06030, N06035, N07750 |
Production Standard
| GB | GB 5310, GB13296, GB/T 9948, GB/T14976, GB/T14975 |
| ASTM | ASTM A213/213M(ASME SA213/SA213M), ASTM A312/312M(ASME SA312/SA312M), ASTM A789/789M(ASME SA789/SA789M), ASTM A790/790M(ASME SA790/SA790M), ASTM B163(ASME SB163), ASTM B423(ASME SB423), ASTM B407(ASME SB407), ASTM B668(ASME SB668) |
| DIN | DIN 17456, DIN17458 |
| EN | EN10216-5 |
| JIS | JIS G3459, JIS G3463 |
Tolerances in Wall Thickness (ASTM A312)
| NPS Designator | Tolerance, % from Nominal | |
| Over | Under | |
| 1/8 to 2-1/2 incl., all t/D ratios | 20.0 | 12.5 |
| 3 to 18 inch., t/D up to 5% incl. | 22.5 | 12.5 |
| 3 to 18 inch., t/D＞5% | 15.0 | 12.5 |
| 20 and larger, welded, all t/D ratios | 17.5 | 12.5 |
| 20 and larger, seamless, t/D up to 5% incl. | 22.5 | 12.5 |
| 20 and larger, seamless, t/D＞5% | 15.0 | 12.5 |
Note:
t = Nominal Wall Thickness;
D = Ordered Outside Diameter.
Tolerances in Outside Diameter (ASTM A312)
| NPS Designator | Tolerances in Outside Diameter | |||
| Over | Under | |||
| In. | mm | In. | mm | |
| 1/8 to 1-1/2, incl. | 1/64 (0.015) | 0.4 | 1/32 (0.031) | 0.8 |
| Over 1-1/2 to 4, incl. | 1/32 (0.031) | 0.8 | 1/32 (0.031) | 0.8 |
| Over 4 to 8, incl. | 1/16 (0.062) | 1.6 | 1/32 (0.031) | 0.8 |
| Over 8 to 18, incl. | 3/32 (0.093) | 2.4 | 1/32 (0.031) | 0.8 |
| Over 18 to 26, incl. | 1/8 (0.125) | 3.2 | 1/32 (0.031) | 0.8 |
| Over 26 to 34, incl. | 5/32 (0.156) | 4.0 | 1/32 (0.031) | 0.8 |
| Over 34 to 48, incl. | 3/16 (0.187) | 4.8 | 1/32 (0.031) | 0.8 |
Tolerances in Straightness (ASTM A312)
| Specified OD, in. | Specified Wall Thickness, in. | Maximum Curvature in any 3ft, in. | Maximum Curvature i Total Length, in. |
| Up to 5.0 incl. | Over 3% OD to 0.5, incl. | 0.030 | 0.010 x length, ft |
| Over 5.0 to 8.0, incl. | Over 4% OD to 0.75, incl. | 0.045 | 0.015 x length, ft |
| Over 8.0 to 12.75, incl. | Over 4% OD to 1.0, incl. | 0.060 | 0.020 x length, ft |
Packing Information
Stainless steel seamless pipes are packed according to the customer’s requirement. To avoid any damage which might be caused during international transportation, we provide some optional packaging methods, including woven bags, plywood cases, and wooden boxes.