AISI 439 Stainless Steel Seamless Round Tubes Cold Rolled SS 2" Sch Xxs
439 stainless steel is a ferritic stainless steel grade commonly used in exhaust systems and other high-temperature applications. It offers excellent heat resistance, corrosion resistance, and durability. Here is a description of 439 stainless steel pipes:
Heat resistance: 439 stainless steel is specifically designed to withstand high temperatures encountered in exhaust systems. It has a maximum continuous operating temperature of around 815°C (1500°F), making it suitable for handling the heat generated by the engine.
Corrosion resistance: 439 stainless steel provides good corrosion resistance, particularly in environments where there is exposure to exhaust gases, moisture, and road salt. It has enhanced resistance to oxidation and corrosion compared to carbon steel exhaust components, making it suitable for extended use in harsh conditions. However, it may not have the same level of corrosion resistance as austenitic stainless steel grades like 304 or 316.
Weldability: 439 stainless steel is highly weldable, allowing for easy fabrication and installation of exhaust system components. It can be welded using common methods such as MIG, TIG, or spot welding, providing flexibility in manufacturing and repair processes.
Exhaust gas compatibility: 439 stainless steel exhibits good resistance to exhaust gas corrosion, making it suitable for handling the acidic and corrosive components present in exhaust emissions. It can withstand exposure to sulfuric acid and other acidic compounds produced during combustion without significant degradation.
Durability: 439 stainless steel pipes are known for their durability and resistance to heat, corrosion, and vibration. They can withstand the rigors of daily use in automotive exhaust systems, ensuring long-term performance and reliability.
Applications: 439 stainless steel is commonly used in exhaust systems for automobiles, trucks, motorcycles, and other vehicles. It is suitable for various components, including exhaust pipes, mufflers, catalytic converters, and exhaust manifolds.
It's important to note that while 439 stainless steel offers good performance in exhaust system applications, it may not have the same level of corrosion resistance as higher-grade stainless steels. In highly corrosive environments or for applications requiring the utmost corrosion resistance, it may be advisable to consider austenitic stainless steel grades like 304 or 316.
According to different uses, the requirements for various properties of stainless steel pipes are different, such as acid and alkali corrosion resistance, intergranular corrosion resistance and stress corrosion cracking performance, pitting resistance, climate corrosion resistance, high temperature and oxidation resistance. For use in high temperature environment, it is also required to have satisfactory high temperature persistent strength, durable plasticity, creep resistance and aging stability.
Stainless steel pipe is mainly used for auxiliary exchanger pipe, water heater pipe, main pipe, cooling water pipe and other pipes. Electricity, as the basis of national economic development, national economy and people's livelihood. The inner wall of the stainless steel pipe is smooth, the water transmission resistance is small, can withstand the erosion of high water flow rate, after solution treatment, the mechanical properties of the pipe and the matrix, the corrosion resistance is basically the same, the performance is excellent, and it is widely used in heaters, boilers, heat exchangers, condensers.
China's production of seamless stainless steel pipes is mainly concentrated in Inner Mongolia Baotou Steel, Shanghai Five Steel (Group) Co., LTD., Great Wall Special Steel Co., LTD., Dalian Steel Plant, Fushun Steel Plant, Daye Special Steel Co., LTD., Chengdu Seamless Steel Plant, although the specific process equipment of each production facility is different. However, its production process is mainly divided into hot-rolled seamless stainless steel pipe production process, cold-working seamless stainless steel pipe production process and hot-extruded seamless stainless steel pipe production process.
439 Stainless steel tube parameter
chemical composition
| material | 439 | |||||||
| chemical composition | C% | Cr% | Ni% | Mn% | Si% | N% | P% | S% |
| ≦0.15 | 16.0-18.0 | 3.5-5.5 | 5.50-7.50 | ≦1.00 | ≦0.25 | ≦0.060 | ≦0.030 | |
| mechanical properties | Yield Strength | tensile strength | elongation | Hardness |
| ≧45 | ≧95 | ≧40 | ≦100 |
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