ASME SA268 Seamless ferritic and martensitic stainless steel tubes
Standard: ASTM A268 / ASME SA268
Steel grade: ferritic stainless steels and martensitic stainless steels
A 450/A 450M Specification for General Requirements for seamless ferritic alloy tubing
A 480/A 480M Specification for General Requirements for flat-rolled stainless steel plate, sheet, and strip (for welded tubing)
E 213 practice for ultrasonic examination of longitudinal welded tubing
E 273 practice for ultrasonic examination of longitudinal welded tubing
| S43000 | S44400 | TP446-1 | TP446-2 | S44660 | S44735 | S41000 | |
| C, max, % | 0.12 | 0.025 | 0.20 | 0.20 | 0.03 | 0.03 | 0.15 |
| Mn, max, % | 1.00 | 1.00 | 1.50 | 1.50 | 1.00 | 1.00 | 1.00 |
| P, max, % | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 |
| S, max, % | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 |
| Si, max, % | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
| Ni, % | - | 1.00 max | 0.75 max | 0.50 max | 1.0-3.5 | 1.00 max | - |
| Cr, % | 11.5-16.0 | 17.5-19.5 | 23.0-27.0 | 23.0-27.0 | 25.0-28.0 | 28.0-30.0 | 11.5-13.5 |
| Mo, % | - | 1.75-2.50 | - | - | 3.0-4.0 | 3.6-4.2 | - |
| Cu, % | - | - | 0.025 | 0.025 | - | - | - |
| N, % | - | 0.035 | - | - | 0.04 | 0.045 | - |
| Ti, % | - | 0.8 max | - | - |
Ti + Cb 0.2-1.0 |
Ti + Cb 0.2-1.0 |
- |
Process: cold drawn for seamless tubing; Welded process with no filler metal added for welded tubing
The tubes cover nominal wall thickness.
Application: Tubing for general corrosion-resisting and high temperature service.
Dimensional range:
OD: 19.05-76.2mm
Length: Up to 24m
Any specific size is to be discussed before offer
The tube be 100% eddy current tested
Ultrasonic test is as option
Straightness ≤1mm/1000mm
Roughness: Ra ≤0.8
Mechanical properties
| S43000 | S44400 | TP446-1 | TP446-2 | S44660 | S44735 | S41000 | |
|
Tensile strength min, Mpa |
485 | 415 | 485 | 450 | 585 | 515 | 410 |
|
Yield strength min, MPa |
275 | 275 | 275 | 275 | 450 | 415 | 215 |
|
Elongation in 50mm min, % |
20 | 20 | 20 | 20 | 20 | 18 | 20 |
Hardness
| S43000 | S44400 | TP446-1 | TP446-2 | S44660 | S44735 | S41000 | |
| Brinell, max | 207 | 217 | 207 | 207 | 265 | 207 | |
| Rockwell, B scale, max | 95 | 95 | 95 | 95 | 58 | 100 | 95 |
Test
- One tension test shall be made on a specimen for lots of not more than 50 tubes. Tension tests shall be made on specimens from two tubes for lots of more than 50 tubes.
- Flaring test (for seamless tubes) shall be made on specimens from one end of one tube from each lot of finished tubes. The minimum expansion of the inside diameter shall be 10%.
- One test shall be made on specimens from one end of one tube from each lot of finished tubes. The flattening test may be performed instead of the flange test unless the flange test is specified in the purchase order.
- Each welded tube shall be subjected to either the hydrostatic or nondestructive electric test. The client may specify which test is to be used. Each seamless tube shall be subjected to the hydrostatic test, or, instead of this test, a nondestructive electric test may be used when specified by the client.
Surface quality
All tubes shall be free of excessive mill scale, suitable for inspection. A slight amount of oxidation will not be considered as scale. Any special finish requirements shall be subject to agreement between the manufacturer and the clients.
Tubes shall be delivered with square cut ends. The ends are free of excessive burrs.
The tubes are bundled in the waterproof plastic sheet and packed in the wooden cases
The case is most suitable for hanging by forklift.
EN10204-3.1 MTC shall be issued
EN10204-3.2 MTC is as option
