Pipes & Fittings : CS vs LTCS

[QW Tian]

Dear Community

I noticed that ASTM material for piping carbon steel (CS) and low temp carbon steel (LTCS)are similar in chemical composition and manufacturing process including heat-treatment. However, LTCS has a higher toughness for impact-test at -45 deg C (or -46 deg C).

I am referring to the following piping ASTM material :
Pipes : A106 Gr B vs A333
Forgings : A105N vs A350 LF2
Fittings : A234 vs A420

My query is which elements/factors cause the LTCS to have a higher toughness ?

I would pose a similar query on Pipeline, Piping & Fluid Mechanics Engineering Group.

regards

QWT

 

[SJones]

Red flagged for duplication

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

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