A333/A333M Seamless and Welded Steel Pipe for Low-Temperature Service
A333 Gr 6 Heat Exchanger Pipe
Material:
Carbon and Alloy Steel, ferritic steel
Grade 1A, Grade3, Grade 4, Grade 6A, Grade 7A
Manufacture:
The pipes are made by seamless and welding process with the addition of no filler metal in the welding operation.
Grade 4 is manufactured by seamless process
Heat treatment:
All seamless and welded pipes, other than Grades 8 and 11, are heat treated to control their microstructure in accordance with methods of:
Normalizing
Quenched and Tempered
Double Normalized and Tempered
TABLE 1 Chemical Requirements
Element
Composition,%
Grade 1A
Grade 3
Grade 4
Grade 6A
Grade 7A
Carbon, max
0.30…