ASTM A268 Seamless TP409 Ferritic Martensitic Boiler Tubes
ASTM A268 Seamless TP409 Ferritic Martensitic Boiler Tubes
YUHONG Group offers ASTM A268 TP409 SMLS/WELDED ferritic martensitic stainless steel tubes and we sell these tubes in more than 70 countries up to now. 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.
TP409 stainless steel, due to its good corrosion resistance and high temperature strength, it is widely used in automotive exhaust systems, gas burners, waste incinerators, home appliances, and construction. In addition, it has good processing properties and is easy to cut, weld and form. Besides, due to its low cost, it is an economical choice in some applications where corrosion resistance is required.
Specifications
| Standard | ASTM A268 |
| Name of Material | Ferritic and Martensitic Stainless SteelTubes----Seamless or Welded |
| Keywordas | Ferritic stainless steel; welded steel tube, etc. |
| Condition | Annealed |
| Quantity | Feet,metres,or number of lengths |
| Length | Specific or random |
Chemical Composition % UNS S40900/TP 409
| Grade | Carbon | Manganese | Phosphorous | Sulfur | Silicon | Nickel | Chromium | Titanium |
| TP409 | 0.08 max | 1.00 max | 0.045max | 0.03max | 1.00max | 0.50max | 10.5-11.7 | 6×Cmin 0.75max |
Tensile Requirements
| Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) |
| TP409 | 170min | 380min | 20 min |
Heat Treatment
As a final heat treatment, tubes shall be reheated to a temperature of 1200°F [650°C] or higher and cooled (as appropriate for the grade) to meet the requirements of this specification
Hardness Requirements
| Brinell Hardness,max | Rockwell Hardness,max |
| 207 | 95 |
Test Required
Chemical Analysis/ Mechanical Properties/ Hardness Test/ Flattening Test/ Tension Test/ FlaringTest
Intergranular Corrosion Test/ Hydrostatic or Nondestructive Electric Test/ Ultrasonic Test
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.
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