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Castings are manufactured by “Melting & pouring “Technique. Alloy losses are more in during casting; hence the compositional range is wider.
Materials chosen for forging already will have some preset compositions, not the same as casting where the composition is to be finalized, when the liquid metal is to be poured. Hence the range could be narrower.
Thanks.
Pradip Goswami, P.Eng,IWE
Independent Welding & Metallurgical Engineering Specialist ,
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
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Delta ferrite reduce ductility and mechanical properties. What Pradeep explained is the manufacturing scenario.
Dear PradipPlease note that the issue is not narrower or wider composition range but is the reason for acceptable level of Cr,Ni.I found that stainless steel castings require delta ferrite for strengthening because there is no way to hot work or heat treatment to increase strength level, so increasing Cr and decreasing Ni level promotes delta ferrite.Actually austenitic stainless steel castings have duplex structure, also delta ferrite has adverse effects on forgeability of stainless steels and limits forging temperature (but I don't know what is adverse effect and how much temperature limit), so delta ferrite should be limited in forgings by decrease Cr level and increase Ni level to decrease delta ferrite.In the meantime I found that delta ferrite increase weld ability of castings, would you please let me know how and why?Regards,Himan Nikdin
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Castings are manufactured by “Melting & pouring “Technique. Alloy losses are more in during casting; hence the compositional range is wider.
Materials chosen for forging already will have some preset compositions, not the same as casting where the composition is to be finalized, when the liquid metal is to be poured. Hence the range could be narrower.
Thanks.
Pradip Goswami, P.Eng,IWE
Independent Welding & Metallurgical Engineering Specialist ,Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAPOi40DFsi6F7Uj2JJsS7a5JGLyoTdqP3D_yjFX7eEW-oy4wsQ%40mail.gmail.com.
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