cHrome molly steel Pipes & tubes
Molly Steel Pipes & Tubes: It has
been used for temperature upto 593oC. In the
small diameter, the material is usually
available in the seamless construction
because of the inability of seamless mills
to fabricate large dia and heavy wall pipe.
It may be necessary to resort for a high
temperature piping system & should be
selected after a careful review of technical
and economic considerations. For temperature
upto 510oC, 1/2 carbon, 1/2 molly, A-335.
Grade P-2 is used. For temperature
510-538oC, 1 Cr, 1/2 Molly steel. A-335
grade p-12 is used. For temperature 538oC to
566oC, 1 1/4Cr, 1/2 molly A-335 P-11 may be
used. For temperature 566oC to 593oC, 2 1/4
Cr, 1 Molly A-335 Grade P-22 is frequently
used. When there is a combination of high
temp and erosive action 5 Cr 1/2 molly ,
A-335 Grade has been desirable.