arunb
Mechanical
- Jul 17, 2002
- 16
Hi to all,
An existing valve stem (Alloy steel 13 Cr.,1 Moly, HB-220-260) is to be replaced. The valve maintenance group prefer A564 Gr.630 (H1100)to be used.
1)I went through the ASME B31.1 Code and found that it is listed under Bolts,Nuts & Studs Austenitic. The max. allowable stress values are not listed, though the specified min. tensile & yield are listed. Can I use this for an application with design temperature of 500 deg.F? and what would be the applicable allowable stress values.
2) The material A564 Gr.630 (H1100) has a high hardness and I am not sure about its machinability. Should this material be bought in the annealed condition and then hardened?
Take care all
arunb
An existing valve stem (Alloy steel 13 Cr.,1 Moly, HB-220-260) is to be replaced. The valve maintenance group prefer A564 Gr.630 (H1100)to be used.
1)I went through the ASME B31.1 Code and found that it is listed under Bolts,Nuts & Studs Austenitic. The max. allowable stress values are not listed, though the specified min. tensile & yield are listed. Can I use this for an application with design temperature of 500 deg.F? and what would be the applicable allowable stress values.
2) The material A564 Gr.630 (H1100) has a high hardness and I am not sure about its machinability. Should this material be bought in the annealed condition and then hardened?
Take care all
arunb