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Material Summary
Grade 321 is the grade of choice for applications in the temperature range of up to about 900°C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion.
Grade 321H is a modification of 321 with a higher carbon content, to provide improved high temperature strength.
Like other austenitic grades, 321 have excellent forming and welding characteristics, are readily brake or roll formed and have outstanding welding characteristics. Post-weld annealing is not required. They also have excellent toughness, even down to cryogenic temperatures. Grade 321 does not polish well, so is not recommended for decorative applications.
Grade 304L is more readily available in most product forms, and so is generally used in preference to 321 if the requirement is simply for resistance to intergranular corrosion after welding. However 304L has lower hot strength than 321 and so is not the best choice if the requirement is resistance to an operating environment over about 500°C.
Chemical Composition
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
321 |
≤0.08 |
≤2.0 |
≤0.75 |
≤0.045 |
≤0.03 |
17.0-19.0 |
- |
321H |
0.04-1.0 |
≤2.0 |
≤0.75 |
≤0.08 |
≤0.03 |
17.0-19.0 |
- |
Tensile strength |
≥689 MPa |
Yield strength |
≥345 MPa |
Elongation (in 50 mm) |
≥40% |
Hardness, Rockwell HRB |
≤85 |
Hardness, Brinell HB |
≤433 |
1.generally export packing
-packed by knitting strips in bundles
2.It is suggested that the pipes OD under 25MM or Less than container shipment are packed by plywood cases, which can protect pipes better.
GOST,ISO9001-2015,AD2000,PED 2014/68/EU,BV Mode II,ISO45001-2018 Certificates.
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