21 STAINLESS STEEL Material

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of 21 stainless steel material in China. With abundant experience, we warmly welcome you to wholesale customized 21 stainless steel material from our factory. For price consultation, contact us.

Gnee Steel is proud to release our new range of 321 STAINLESS STEEL material.

Good engineering starts with choosing the correct material.

If you’re designing a turbo manifold, choosing the right material for the application is vital in ensuring the part will repeatedly withstand extreme heat cycling and stand the test of time.

Grade 321 is a Titanium-stabilised stainless steel which has a major advantage in its resistance to intergranular corrosion following prolonged exposure to temperatures within the chromium carbide precipitation range of 427°C to 815°C (800-1500 degF).

Why use 321 stainless over 304 stainless in turbo manifold applications?

321 stainless is specifically designed for use in high temperature applications. One major chemical difference between 321 and 304 stainless is the addition of titanium in 321 stainless to "stabilize" the alloy and to eliminate the risk of intergranular corrosion. When 304 stainless is held in the precipitation range for an extended period of time the carbon and chromium atoms will move (precipitate) to form chromium carbide, depleting the structure of chromium and its corrosion resistance. When this occurs the cromium depleted zones are now susceptible to corrosion cracking . This makes 321 stainless ideal for use in turbo exhaust manifolds and other exhaust products that see high levels of heat over prolonged periods of time. 321 stainless is the superior choice for heat-related corrosion resistance.

Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM A240 and ASME SA240*.

* Maximum, unless range is indicated

Mechanical Properties
Mechanical property requirements for annealed product as specified in ASTM A240 and ASME SA240.

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