ASTM A268 Ferritic and Martensitic Stainless Steel Tubing
- Grade: TP405, TP410, TP429, TP430, TP443, TP446-1, TP446-2, TP409, TP439, TP430Ti, TP468
- Tube OD: 4-127mm
- Tube WT: 0.4-12.7mm
- Length: 1000-12000mm
- Type: Seamless & Welded
ASTM A268 Ferritic and Martensitic Stainless Steel Tubing
Golden Sunbird Metals supplies premium ASTM A268 ferritic and martensitic stainless steel tubing designed for reliable performance in demanding industrial applications. This specification covers tubing that offers excellent strength, good corrosion resistance, and dependable resistance to oxidation, making it suitable for heat exchangers, condensers, superheaters, boilers, petrochemical systems, and other high-temperature service environments. ASTM A268 stainless steel tubing is valued for its durability, dimensional accuracy, and stable mechanical properties, helping ensure long-term service life and efficient operation. At Golden Sunbird Metals, we provide ASTM A268 ferritic and martensitic stainless steel tubing in a range of grades, sizes, and wall thicknesses to meet diverse project and industry requirements. Whether your project calls for heat-resistant tubing, corrosion-resistant tubing, or a cost-effective stainless steel solution for critical service, our products are manufactured to deliver consistent quality and dependable performance.
ASTM A268 Ferritic and Martensitic Stainless Steel Tubing Chemical Composition (wt.%)
| Element | TP405 | TP410 | TP429 | TP430 | TP443 | TP446-1 | TP446-2 | TP409 | TP439 | TP430Ti | TP468 |
| C, max | 0.08 | 0.15 | 0.12 | 0.12 | 0.2 | 0.2 | 0.12 | 0.08 | 0.07 | 0.03 | 0.03 |
| Mn, max | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.50 | 1.50 | 1.00 | 1.00 | 1.00 | 1.00 |
| P, max | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.045 | 0.04 | 0.04 | 0.04 |
| S, max | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.045 | 0.03 | 0.03 | 0.03 |
| Si, max | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
| Ni | 0.50 max | – | – | – | 0.75 max | 0.75 max | 0.50 max | 0.80 max | 0.50 max | – | 0.5 |
| Cr | 11.5-14.5 | 11.5-13.5 | 14.0-16.0 | 16.0-18.0 | 18.0-23.0 | 23.0-27.0 | 23.0-27.0 | 10.5-11.7 | 17.0-19.0 | 17.0-19.0 | 18.00-20.00 |
| Mo | – | – | – | – | – | – | – | – | – | – | 0.2-1.2 |
| Al | 0.10-0.30 | – | – | – | – | – | – | – | – | – | – |
| Cu | – | – | – | – | 0.90-1.25 | – | – | – | – | – | – |
| N | – | – | – | – | – | – | 0.25 | – | 0.04 | – | 0.03 |
| Ti | – | – | – | – | – | – | – | – | 0.20 + 4(C+N) min | 0.20-1.00 | – |
ASTM A268 Ferritic and Martensitic Stainless Steel Tubing Mechanical Properties
| Property | TP405 | TP410 | TP429 | TP430 | TP443 | TP446-1 | TP446-2 | TP409 | TP439 | TP430Ti | TP468 |
| Tensile strength, min, ksi [MPa] | 60 [415] | 60 [415] | 60 [415] | 60 [415] | 70 [485] | 70 [485] | 65 [450] | 55 [380] | 60 [415] | 60 [415] | 60 [415] |
| Yield strength, min, ksi [MPa] | 30 [205] | 30 [205] | 35 [240] | 35 [240] | 40 [275] | 40 [275] | 40 [275] | 25 [170] | 30 [205] | 35 [240] | 30 [205] |
| Elongation in 2 in. or 50 mm, min, % | 20 | 20 | 20 | 20 | 20 | 18 | 20 | 20 | 20 | 20 | 22 |
| Brinell Hardness, max | 207 | 207 | 190 | 190 | 207 | 207 | 207 | 207 | 190 | 190 | 207 |
| Rockwell Hardness, B Scale, max | 95 | 95 | 90 | 90 | 95 | 95 | 95 | 95 | 90 | 90 | 95 |
Features
- ASTM A268 Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service (grades TP405, TP410, TP409, TP430, TP439, TP446-1/2, TP443, TP430Ti, TP468, etc.).
- Excellent corrosion, oxidation, and scaling resistance in high-temperature and mildly corrosive service environments.
- Good thermal conductivity combined with adequate mechanical strength for efficient heat transfer applications.
- Available in both seamless and welded forms with hot-finished or cold-finished processing options.
- Cost-effective ferritic grades (e.g., TP409, TP439) optimized for high-heat automotive exhaust and oxidation resistance.
- Martensitic grades (e.g., TP410) offering hardenability and improved toughness after heat treatment.
- Annealed delivery condition ensuring reliable ductility, formability, and weldability (certain grades require no post-weld heat treatment).
- Straight-chromium ferromagnetic types providing stable performance in general corrosion-resisting and elevated-temperature service up to typical industrial limits.
Technical Specifications
| Specification | Value |
| Standard | ASTM A268/A268M Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service |
| Grade | TP405, TP410, TP429, TP430, TP443, TP446-1, TP446-2, TP409, TP439, TP430Ti, TP468 |
| Manufacturing Process | Hot Finished, Cold Finished, Welded |
| Seam Type | Seamless, Welded |
| Dimension | Tube OD: 4-127mm Tube WT: 0.4-12.7mm |
| Length | 1000-12000mm |
| Delivery Condition | Annealed |
| Inspection Certificate | EN 10204 Type 3.1 (Mill Test Certificate), EN 10204 Type 3.2 (Witness Testing or 3rd Party Inspection) |
| Test | Chemical analysis, Tension tests, Flaring tests, Hydrostatic tests, Air underwater pressure tests, Nondestructive electric tests |
Applications
- Automotive exhaust systems, mufflers, and catalytic converters (especially TP409 and TP439 for superior heat and exhaust-gas corrosion resistance).
- Heat exchangers, boilers, and superheaters requiring excellent thermal conductivity and high-temperature oxidation resistance.
- Petrochemical and refinery furnace tubes and process piping in high-temperature corrosive environments.
- Power generation components including steam turbine parts and select high-temperature service in nuclear or conventional plants.
- Food processing equipment and piping where corrosion resistance and non-contaminating properties are essential.
- Pulp and paper industry bleaching and digesting equipment exposed to corrosive chemicals and elevated temperatures.
- Water treatment and desalination systems handling saline or brackish water environments.
- General industrial tubing for corrosion-resisting and high-temperature service requiring cost-effective, weldable stainless steel solutions.
