316L VS CF3M

[Isha90]

Class 1500 Example: A182 Gr.F316L 206.8 bar, A351 Gr.CF3M 248.2 bar
As per ASME B16.34 at 38°C working pressures are different, Why

 

[mk3223]

The different working pressures of A182-F316L (forge material) and A351-CF3M (casting material) may be due to the allowance stresses of them.

 

[metengr]

Because of the different product forms and processing. If you review ASME Section II Part D you will see the allowable stresses can vary by specific product form.

 

[Isha90]

Thank you, Allowable stress of SA351CF3M > SA182F316L,as per ASME SectionII-D Casting stronger than Forging, but in ASME B31.1 Forging stronger than Casting, Why

 

[XL83NL]

Different codes, different rules. Code committees take decisions for which the rationale or explanation isnt necessarily always available to the public years later. Maybe someone here knows, maybe not. Thats how codes work.

 

[metengr]

Please read the applicable Notes in Appendix A Table A-3 in B31.1 for A 351.