Stainless Steel Grade 321 (UNS S32100), stainless steel
Typical applications include:
• Aircraft exhaust manifolds
• Expansion joints
• Furnace parts
• Heating element tubing
• Heat Exchangers
• Woven or welded screens for high temperature mineral processing
• Spiral Welded tube for burner pipes and flues
COMPLETE FACILITIES for Slitting - Shearing - Blanking and Edging. Available in coils or cut lengths. Sizes other than those listed
and in all thicknesses .001 and heavier are obtainable and may be
ordered for you.
ASTM A 240
Rockwell B92 Max.
C .08 Max.
Mn 2.00 Max.
Cr 17.00 /19.00
Ti .70 Max.
P .040 Max.
S .030 Max.
Si .75 Max.
Typical mechanical properties for grade 321 stainless steels are
given in table 1.
Table 1. Mechanical properties of 321 grade stainless steel
|Grade||Tensile Strength (MPa) min||Yield Strength 0.2% Proof (MPa) min||Elongation (% in 50mm) min||Hardness|
|Rockwell B (HR B) max||Brinell (HB) max|
|321H also has a requirement for a grain size of ASTM No 7 or
Solution Treatment (Annealing) - heat to 950-1120°C and cool
rapidly for maximum corrosion resistance.
Stabilising - heat to 870-900°C for 1 hour per 25mm of thickness
and air cool. Stabilisation is recommended for most severe service
conditions (above 425°C) and particularly for material annealed at
the upper side of the annealing temperature range.
Stress Relief - Heat to 700°C for 1 to 2 hours and air cool.
These grades cannot be hardened by thermal treatment.
Excellent weldability by all standard fusion methods, both with and
without filler metals. AS 1554.6 pre-qualifies welding of 321 and
347 with Grade 347 rods or electrodes; high silicon version of 347
is also pre-qualified for welding of 321.