SS can become sensitized (formation of chromium carbides along grain boundaries) if it cools off too slow. Typically sensitization is prevented by using an "L" type SS such as 304L or 316L. Duplex SS steels are not susceptible to sensitization.
The preheat requirement should consider they type of SS used and the chemistry of the alloy steel. The higher the CE value for the allow steel, the more likely martensite will form.
Regards,
Geoff
-- On Fri, Aug 2, 2013 at 6:18 AM, RAJA SEKAR <sriraju1984@gmail.com> wrote:
Dear Sir,
Alloy steel has phase transformation while heating or cooling, so it require heat tratement. But for SS(P8 group only) it has no phase transformation, so it does not require any heat treatment.
If welding alloy steel with SS(P8) preheat is done on alloy steel side only as per the requirement.
Regards
Rajasekar
On Thursday, August 1, 2013 11:07:47 PM UTC+5:30, g.venkatesan06 wrote:Dear experts--
why preheat is mandatory for alloy steel and not mandatory for
stainless steel. Give some metallurgical reason and code reference.
Is joining alloy with stainless steel what is the preheat requirement.
Regards
venkatguru
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