430 Stainless for exhaust application?
430 Stainless for exhaust application?
(OP)
We'd like to substitute 430 Stainless for 409 stainless for use in a muffler / motorcycle exhaust application. Our factory touts that it has better corrosion resistance than 409 and is, in their case, easily obtained. There is some concern that 430 stainless could become brittle in this particular application.
From the AZoM web site regarding 430 Stainless Steel:
"...resists oxidation in intermittent service up to 870°C and to 815°C in continuous service. This grade may become brittle at room temperature after prolonged heating in the 400-600°C range. ... Slow cooling from 540-400°C will cause embrittlement".
It is unclear however as to what "slow cooling" means when applied to sheetmetal or even if these statements are applicable to us. For a muffler application, we'd certainly would be operating within the 400 - 600C range but sheetmetal parts should cool rather quickly. Should there be a concern?
From the AZoM web site regarding 430 Stainless Steel:
"...resists oxidation in intermittent service up to 870°C and to 815°C in continuous service. This grade may become brittle at room temperature after prolonged heating in the 400-600°C range. ... Slow cooling from 540-400°C will cause embrittlement".
It is unclear however as to what "slow cooling" means when applied to sheetmetal or even if these statements are applicable to us. For a muffler application, we'd certainly would be operating within the 400 - 600C range but sheetmetal parts should cool rather quickly. Should there be a concern?





RE: 430 Stainless for exhaust application?
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RE: 430 Stainless for exhaust application?
RE: 430 Stainless for exhaust application?
RE: 430 Stainless for exhaust application?
RE: 430 Stainless for exhaust application?
even 409 will embrittle over time so I don't see that as a big difference
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Plymouth Tube
RE: 430 Stainless for exhaust application?
RE: 430 Stainless for exhaust application?
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RE: 430 Stainless for exhaust application?
RE: 430 Stainless for exhaust application?
We made some very precision parts from 430, 18+ Cr. and we have purposely form a tight oxide surface after machining. If we didn't force this oxide the part would become useless after 2 or 3 cycle in our process.
RE: 430 Stainless for exhaust application?
The 430 spec has two grades, low C and high C. The low C is ferritic and behaves much like 439.
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Plymouth Tube