Spezilla Tube Co., Ltd. (Shanghai)
Spezilla Tube Co., Ltd. Excellence in Stainless Steel Tubing
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Ferritc Stainless Steel TP409/409L Tube for Automotive ASME SA268 ASTM A268
Ferritic stainless steels are classified in the 400 series, usually with 10% to 30% chromium content, and are often chosen for their excellent corrosion resistance and elevated temperature oxidation resistance. With greater strength than carbon steels, ferritics provide an advantage in many applications where thinner materials and reduced weight are necessary, such as automotive emission control systems. They are nonhardenable by heat treating and are always magnetic.
A ferritic stainless steel tube, type 439 outperforms both type 409 and 436 in oxidation and corrosion resistance in the most-demanding environments. Type 439 stainless steel tube withstands temperatures upwards of 1700˚F (927˚C), exceeding the limits of both types 409 and 436. Its chemical composition gives type 436 ideal formability for difficult-to-form systems and components.
TP409/409L have the lowest chromium content of all stainless steels and are ideal for slightly corrosive environments where localized rust is acceptable. The least expensive of all stainless steels, type 409 was initially created for automotive exhaust systems silencers, but can now be found in automotive exhaust tubing and catalytic converter casings. Type 410L is often used for containers, buses and LCD monitor frames.
Typical Manufacturing Specifications:
ASTM A268
ASME SA268
- Harding by heat treatment
- High hardness with good ductility
- Good corrosion resistance capability
- Good wear corrosion resistance
- High cold-deformation property
| Item Code: | TP409 |
| Tube OD.: | 1/4'' - 2'' |
| Wall: | 0.028'' - 0.120'' |
| Length: | 20FT |
| Material: | 405 |
| Standard: | ASTM A268 ASME SA268 |
| Finish: | Annealed & Pickled. |
| Type: | Seamless Cold Drawn |
| Certification: | ISO9001:2015 |
| Mill Test Certificate: | EN10204 3.1 |
| Packing: | Sleeved, Wooden Boxed |
Grade 409/409L is a titanium stabilized Ferritic Stainless Steel , most commonly known for use in automotive exhaust systems. It features good mechanical properties and high temperature corrosion resistance. As a matter of fact, 409 / 409L as a chromium Stainless Steel can also be used in applications where weldability and corrosion protection are demanded. Although it is susceptible to rust formation, rarely used for decoration purpose, 409 / 409L stainless steel demonstrates excellent corrosion resistance against gas corrosion.
Alloy TP 409 Pipes is suitable for service in highly corrosive conditions and where high strength is required. The properties of this alloy are being widely used in offshore oil and gas exploration and production and in heat exchangers in petrochemical and chemical processing.
Type 409 stainless steel has a unique chemical composition that includes:
Available Tube Product Forms:
Straight.
Coiled.
Typical Applications:
Used for parts requiring a combination of good strength and toughness, plus reasonable corrosion resistance. Typical applications are: Bolts, Bushings, Fasteners, Gas Turbine Parts, Mine Equipment, Pump Parts, Petrochemical Equipment, Steam Turbine Parts, Studs, Valve Parts etc.
Material magnetic in all conditions.
The typical applications of grade 409 stainless steels are listed below:
Grade 409 stainless steels offer scaling resistance at temperatures up to 675°C during continuous operation, and up to 815°C under intermittent conditions. These temperatures pertain to specific service environments.
Annealing of grade 409 steels is carried out at temperatures ranging from 790 to 900°C, followed by air-cooling. Thermal treatment does not harden grade 409 steels.
Grade 409 steels must be pre-heated to temperatures of 150 to 260°C before welding. Although grade 430 and 409 filler rods or electrodes can be used during welding of grade 409 steels, grade 309 electrodes or filler rods are strongly recommended by AS 1554.6. Care should be taken to weld grade 409 steels with minimum heat, in order to mitigate grain growth.
Ductility of the welded products can be improved by annealing post-welding at temperatures of 760 to 815°C. However, this is not required for thin welded products. Welding of exhaust tubing of automobiles is carried out without filler rods.
Quality Assurance:
Spezilla's seamless bright annealed stainless steel tubes are produced acc. to the following process and inspection to assure our quality:
1. Chemical Composition Analysis Test With 100% PMI.
2. Solution Annealing / Bright Annealed.
3. 100% Hydrostatic Test and 100% Eddy Current Test
4. Mechanical Tests includes Tension Test, Flattening Test, Flaring Test, Hardness Test.
5. Impact Test subject to Standard request.
6. Grain Size Test and Intergranular Corrosion Test.
7. Visual Test and Endoscope Test for Surface Quality Test
| 5% Test Solution at 120°F (49°C) | Corrosion Rate in Mils per Year and Millimeters per Year (mm/a) | ||||||
|---|---|---|---|---|---|---|---|
| Alloy 409 | Alloy 410S | Alloy 420 | Alloy 425 Mod | Alloy 440A | Alloy 430 | ||
| Acetic Acid | 0.88 (0.022) | 0.079 (0.002) | 1.11 (0.028) | 4.79 (0.122) | 2.31 (0.0586) | 0.025 (0.0006) | |
| Phosphoric Acid | 0.59 (0.002) | 0.062 (0.002) | 0.068 (0.002) | 0.593 (0.015) | 0.350 (0.009) | 0.029 (0.001) | |
ASTM A268 Tp410 tube composition:
| Grade: | TP405 | TP410 | TP249 | TP430 | TP443 | TP446-1 | TP446-2 | … | TP409 |
| UNS | S40500 | S41000 | S42900 | S43000 | S44300 | S44600 | S44600 | S40800 | S40900 |
| C, max | 0.08 | 0.15 | 0.12 | 0.12 | 0.20 | 0.20 | 0.12 | 0.08 | 0.08 |
| Mn,max | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.50 | 1.50 | 1.00 | 1.00 |
| P, max | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.045 | 0.045 |
| S, max | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.03 | 0.045 | 0.045 |
| Si, max | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
| Ni | 0.50max | … | … | … | 0.75max | 0.75max | 0.50max | 0.80max | 0.50max |
| 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 | 11.5-13.0 | 10.5-11.7 |
| Mo | … | … | … | … | … | … | … | … | … |
| Al | 0.10-0.30 | … | … | … | … | … | … | … | … |
| Cu | … | … | … | … | 0.90-1.25 | … | … | … | … |
| N | … | … | … | … | … | 0.25 | 0.25 | 12xCmin | 6xCmin |
| Ti | … | … | … | … | … | … | … | 1.10max | 0.75max |
| Chemical Composition | |||||||||||
| Min. % | Max % | ||||||||||
| Carbon | 0.09 | 0.15 | |||||||||
| Silicon | 0 | 1.00 | |||||||||
| Manganese | 0 | 1.00 | |||||||||
| *Nickel | 0 | 1.00 | |||||||||
| Chromium | 11.50 | 13.50 | |||||||||
| Phosphorous | 0 | 0.04 | |||||||||
| Sulphur | 0 | 0.03 | |||||||||
| *Nickel additional option | |||||||||||
