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ksarita (Mechanical) (OP)
24 Feb 05 11:17
hi ,
Can any one give me the values  of youngs modulus and tensile properties of SS420 ans 304SST.
What is the major difference between them. What does SST stand for.
Please help me. i despiratly need this information.

NickE (Materials)
24 Feb 05 11:53
You can use 29,000,000psi for the young's modulus for both. maybe a little lower for the 304. Tensile properties vary widely for these two stainless steels depending on condition.

ksarita (Mechanical) (OP)
24 Feb 05 12:00
hi NickE,
Thanks for the information. so when i do structural analysis using this value. then how can the stress vary between them. so is the density different for both of them.
Actually i am doing a structural analysis using pro/e. so while defining the material, its asks for the density, thermal conductivity and the youngs modulus.
So can u give me further details regarding this.
And what can be a good source where i can find all such kind of details regarding metals.
PLease help me out.
EdStainless (Materials)
24 Feb 05 12:38
420 is a martensitic stainless.  Roughly 14% Cr with no Ni or Mo.  It is hardenable by heat treatment, magnetic, and has limited corrosion resistance.  The mechanical properties are a function of the heat treatment.
The room temp modulus is 30 million psi,
coef of thermal exp at room temp is 5.7 ppm/F,
the density is 0.276#/cuin,
and a thermal cond of 13.5 BTU/hr-ft-F.

304 is an austenitic stainless, roughly 18% Cr and 8% Ni.  When annealed it is non-magnetic, very ductile and not very strong.  This alloy can only be strengthened by cold working.
E rt = 28 million psi
CTE rt = 9.6 ppm/F
density = 0.287#/cuin
therm cond rt = 9.4 BTU/ft-hr-F

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

Helpful Member!  CoryPad (Materials)
24 Feb 05 12:40
SST means Stainless Steel.

You can obtain materials properties from MatWeb:



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