LTCS (Low Temperature Carbon Steel) is used in piping system when there is a possibility of process fluid temperature falling below -20°F during operation. Low-temperature carbon steels have been chiefly used in low-temperature equipment such as chemical plant below -55 °F and especially for welded pressure vessels.
ASTM A333 / A333M,Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications with Required Notch Toughness.It covers seamless and welded steel pipe for use at cold temperature service up to minus 50° F (minus 45° C) .
There are several grades in A333, each with different steelmaking approach to improve the steel’s impact properties at lower temperatures.Grades 1 and Grsde 6 are impact tested at -50°F and Gr6 is a commonly used grades.A333 Gr6 is used for pressure piping of compressed gas, where a crack would be expected to have catastrophic consequences.
Sometimes ASTM A106 Gr B material is replaced by ASTM A333 Gr 6 for LTCS in normal operation. There is no major difference in between these two materials in composition.Also no non-destructive testing is available which can ensure these two materials. So sometimes the material mix up may occur in construction sites.
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