431S29T Stainless

[Bainford]

Hello
Is there an ASTM or AMS spec that is equivilent to, or includes, 431S29T stainless steel?

Also, I'm assuming that 431S is a grade of stainless, including it's material make up. Is this correct? If so, does the 29T refer to it's ability to be heat treated and the qualities attained therein, or perhaps that the material is supplied pre heat treated?

Any help is appreciated. Thanks.

 

[metengr]

The chart below describes similar grades of stainless steels for comparison. There is a 431S29 without the T condition. You can search the internet to find the T condition.

I want to caution you that you are at your own risk by using charts like this and not following up by reviewing the actual standard(s) associated with the material specification. I use similar charts to give me a ball park comparison and if it looks close, I obtain the standard to review before final selection.

http://www.steelstrip.co.uk/stainless_steel_comparisons.htm

 

[JoeyV87]

AISI 430 is chemically very similar. It can be presumed that in the same HT condition, it would display very similar properties.

 

[Bainford]

Thanks for the help, guys. I work for a UK company doing business in Canada. When having parts made locally, I need to convert the UK spec'd material quoted on our drawings to a locally available North Ameriacan spec. Most of our drawings call out BS standards, or reference NES (Def Stan) specifications. Sometimes direct conversion is not possible, and I'm not necessarily at liberty to make substitutions. Additionally, the internet provides a confusing and often conflicting array of choices, adding further difficulty.

In the 431S29T stainless mentioned in the above query, the 431S part is familiar, and relates to an ASTM specification, and I have found references that include the '29' suffix. The meaning of the '29T' part confuses me, especially the significance of the 'T'.

Thanks again.

 

[RPstress]

431S29 is a UK martensitic stainless to BS 970 (i.e., a bit out of date—I suspect that commercial stainless steel in the UK should be to EN 10088, though we use BS 970 when we want a bit of material to make a test rig or something and people seem happy to supply to it).

The T condition in BS 970 has a limiting ruling section of 150 mm and a minimum yield of 680 MPa and an ultimate of 850–1000 MPa. For impact the T condition has an Izod of 25 ft-lb (<= 63 mm) and 15 ft-lb (> 63 mm).

It looks like it may be slightly different from AISI 431:
[tt]
C Si Mn P S Cr Ni
431S29 0.12–0.20 <=1.0 <=1.0 <=0.040 <=0.030 15.0–18.0 2.0–3.0[/tt]