321 stainless steel specifications.pdf

321 stainless steel specifications.pdf 

321 stainless steel Implementation standards
ASTM A240 (plates, coils), ASTM A276 (bars, profiles), ASTM A312 (seamless/welded pipes)
ASME SA-240, SA-276, SA-312 (for pressure equipment)
EN 10088-2:2005 (European standard, grade X6CrTi18-10)
GB/T 24511 (Chinese standard, grade 06Cr18Ni11Ti)
Special requirements: NACE MR0175 (anti-sulfide stress corrosion) certified materials can be provided (customized).

321 stainless steel Corrosion resistance:
Intergranular corrosion resistance: Through titanium stabilization treatment (Ti≥5C%), chromium carbide precipitation can be avoided even in the sensitization temperature range of 400-800℃ (welding heat affected zone), and the intergranular corrosion resistance is significantly better than 304 stainless steel (especially suitable for welded structures).

321 stainless steel processing and welding:
Cold processing: Good plasticity, can be formed by cold bending and stretching (such as pipe elbows, equipment shells), but the work hardening rate is moderate, and the deformation needs to be controlled to avoid cracking.
Welding:
It is recommended to use niobium/titanium welding wire (such as ER347, containing Nb stabilizing elements), or directly use 321 parent material welding wire to avoid excessive welding heat input and titanium burning.
It can resist intergranular corrosion without heat treatment after welding (relying on titanium to stabilize carbon), and is suitable for manufacturing large welded components (such as boiler pipes, heat exchangers).
321 stainless steel high temperature resistance:
When in long-term service at 500-700℃, its creep resistance and stress rupture resistance are better than 304 stainless steel, and it is often used for components that withstand high temperature stress (such as turbine exhaust pipes and heating furnace brackets).