ASTM A268 TP409 is a martensitic stainless steel seamless or welded round tube containing 11.5%–13.5% chromium and ≤0.15% carbon, designed for high-temperature and general corrosion-resistant applications.
GNEE supplies high-quality ASTM A268 TP409 stainless steel round tubes. The manufacturing process includes strict chemical composition control, heat treatment (annealing temperature ≥1200°F [650°C]), and mechanical property testing (e.g., tensile strength of 415-485 MPa).
TP409 stainless steel high-temperature pipes are manufactured using a seamless process (e.g., extrusion or piercing). The seamless structure ensures uniform wall thickness, seamless integrity (no welds), and higher pressure resistance reliability. The pipes are available in both solution annealed and heat-treated conditions.
Furthermore, all pipes undergo rigorous quality inspection, including hydrostatic testing at a minimum pressure of 5.5 MPa (800 psi) to ensure leak-tightness; and visual inspection and surface finish evaluation (Ra ≤6.3 μm) to ensure the absence of cracks, pits, or scratches. This ensures reliable performance in automotive exhaust systems, heat exchangers, and industrial piping.
ASTM A268 TP409 tube specification
| Specifications | : | ASTM A268 / SA 268 |
| Dimensions | : | ASTM, ASME |
| Size | : | 1/4″ (6.25mm) to 8″ (203mm), WT 0.02″ (0.5mm) to 0.5″(12mm) |
| Schedule | : | Sch 20, Sch 30, Sch 40, STD, Sch 80, XS, Sch 60, Sch 80, Sch 120, Sch 140, Sch 160, XXS |
| Specialized in | : | Large Diameter Size |
| Length | : | Single Random, Double Random & Cut Length. |
| Form | : | Round, Square, Rectangular, Hydraulic Etc |
| End | : | Plain End, Beveled End, Treaded |
Chemical composition ( weight % )
| Grade | C | Si | Mn | P | S | Cr | Ni | Ti |
| TP409, UNS S40900 | 0.08 max | 1.00 max | 1.00 max | 0.045 max | 0.030 max | 10.5~11.7 | 0.5 max | 6*C min, 0.75 max |
Mechanical properities
| Tensile strength | Yield strength | Elongation |
|
380 |
170 |
20 |
Applications Industries
Heat Exchangers
Sea Water Equipment
Condensers & Boiler
Petrochemicals- Oil Refining Chemical,etc.
Food Processing- Salt Making,etc.
Energy Field- Nuclear Power Generation,Tidal Power Generation,etc
Environmental Protection Field- Gas Processing,Waste Water Treatment,etc.
Test Required
Chemical Analysis/ Mechanical Properties/ Hardness Test/ Flattening Test/ Tension Test/ FlaringTest
Intergranular Corrosion Test/ Hydrostatic or Nondestructive Electric Test/ Ultrasonic Test
Value-added services: Pre-treatment, parts cutting, third-party inspection, and sample services.
ASTM A268 TP409 Stainless Steel Seamless Tube Price list
Reference Price: USD 3.0 – 6.0 per kg, depending on size, wall thickness, and surface finish. Prices are subject to order quantity and shipping terms (FOB/CIF).
All tubes meet ASTM A268 standards, ensuring seamless structure, weldability, and long-term durability. Certified by ISO, SGS, and BV, Gnee TP409 seamless tubes provide reliable performance for demanding industrial applications.
