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Ferritic Martensitic Seamless Tube ASTM A268 TP409 1.4512 S40900
This specification covers a number of grades of nominal-wall-thickness, stainless steel tubing for general corrosion-resisting and high-temperature service. Most of these grades are commonly known as the “straight-chromium” types and are characterized by being ferromagnetic.
The tubes shall be made by the seamless or welded process with no
filler metal added, tubes shall be reheated to a temperature of
1200.F [650.C] or higher and cooled to meet the requirements of
this specification, All tubes shall be free of excessive mill
scale, suitable for inspection. A slight amount of oxidation will
not be considered as scale.
Grade 409 stainless steel is a Ferritic steel that offers good mechanical properties and high-temperature corrosion resistance. It is commonly considered as a chromium stainless steel, with applications in exhaust systems of automobiles and applications that demand weldability.
TP409 stainless grade combines the following characteristics:
-Basic corrosion and oxidation resistance
-Composition balanced for optimum formability
-Weldable only in thin sections due to fully ferritic structure
-Low cost and limited cost variation due to low alloy content
Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Ni | Ti |
| TP409 | 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 |
409 Stainless Steel Tubing Tolerance
Stainless Steel 409 Tube OD | Stainless Steel 409 Tube Tolerance |
|---|---|
4mm to 35mm | +/- 0.08mm |
35mm to 38mm | +/- 0.15mm |
38mm to 60mm | +/- 0.20mm |
60mm and above | +/- 0.25mm |
Equivalent Material
STANDARD | WERKSTOFF NR. | UNS | JIS | KS |
TP409 | 1.4512 | S40900 | SUS409 | STS409 |
Mechanical Properties
| Grade | Tensile strength | Yield strength | Elongation |
| TP409 | 380 | 170 | 20 |
Physical Properties
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100°C (J/kg.K) | Electrical Resistivity (nΩ.m) | |||
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| TP409 | 7800 | 200 | 11.0 | 11.7 | 12.4 | 25.8 | 27.5 | 460 | 600 |
Applications
-Aerospace – piston engine manifolds
-Chemical Processing
-Expansion Joints
-Food Processing – equipment and storage
-Petroleum Refining – polythionic acid service
-Waste Treatment – thermal oxidizers
