Patent ID: 11946125
Assignee: POSCO CO., LTD
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 3:
4. A ferritic stainless steel pipe comprising:
a base material comprising, in percent (%) by weight of the entire composition, C: 0.005 to 0.02%, N: 0.005 to 0.02%, Cr: 11.0 to 13.0%, Ti: 0.16 to 0.3%, Nb: 0.1 to 0.3%, Al: 0.005 to 0.05%, Mo: 0.005% or less, B: 0.005% or less, the remainder of iron (Fe) and other inevitable impurities, and
a weld zone having a texture maximum strength of 30 or less in the {001} direction,
wherein the weld zone comprises a secondary phase of 10 to 100 pieces/mm2,
wherein the secondary phase comprises nitride, oxide and Laves phase precipitates, and
wherein a ductile to brittle transition temperature (DBTT) of the weld zone is −50° C. or less.