ASTM A 350 LF2 forging equivalent

[GabrieleB]

I have to specify a material for piping valves to be used for low temperature service up to -40° according to EN standard.
The process piping design code EN 13480-2 does not give indication for a forging material for temperature up to -40°C, but traditional carbon steel material are applicable only up to -20°C (Es. 10222-4 P285) as per Table B.2-5.
In the mentioned table to come up to -60°C should be used Ni alloyed carbon steel as 15NiMn6 grade.

Which carbon steel material grade can be used for forging (flange, valves) when you have a design requirement of -40°C??
In the American Standard is commonly used the ASTM A 350 LF2 Grade where a Charpy test at -46°c is specified. Is there an equivalent grade according to European Standard Code?

Thanks for help me!

 

[hsbcn]

Stainless steel could handle the design requirement. Any reason not to move from carbon to stainless A182 F316, for example?

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[GabrieleB]

Stainless steel is obviously applicable, in fact stainless steel doesn't have any problem at very low temperature.
In this case I'm asking for a low temperature Carbon Steel based on the European Norme (EN) for forging that could be equivalent to the low temperature Carbon Steel ASTM A 350 LF2.

 

[abubakar4u2003]

You can use 4130. It's normally used for valve bodies and works fine in the temperature range you have mentioned.