SUS321 stainless steel plate haosteel hot cold rolled 1550mm width
mill finish length can cut
Grades 321 is the basic 18/8 austenitic steel (Grade 304)
stabilised with Titanium. This grade is not sensitive to
intergranular corrosion after heating within the carbide
precipitation range of 425-850°C. 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 controlled higher carbon
content, to provide improved high temperature strength.
Like other austenitic grades, 321 has excellent forming and welding
characteristics, is readily brake or roll formed and has
outstanding welding characteristics. Post-weld annealing is not
required. Grade 321 also has excellent toughness, even down to
cryogenic temperatures. Grade 321 does not polish well, so is not
recommended for decorative applications.
These properties are specified for flat rolled product (plate,
sheet and coil) in ASTM A240/A240M. Similar but not necessarily
identical properties are specified for other products such as pipe
in their respective specifications.
Composition Specification (%)
Mechanical Property Specification
Tensile Strength (MPa)
(% in 50mm) min
321H also has a requirement for a grain size of ASTM No 7 or
Physical Properties (typical values in the annealed condition)
|Mean Coefficient of Thermal Expansion||Thermal Conductivity|
|at 100°C (W/m.K)||at 500°C (W/m.K)|
Grade Specification Comparison
|Euronorm||Swedish SS||Japanese JIS|
Good oxidation resistance in intermittent service to 900°C and in
continuous service to 925°C. These grades perform well in the 425-
900°C range, and particularly where subsequent aqueous corrosive
conditions are present. 321H has higher hot strength, and is
particularly suitable for high temperature structural
applications.Heat TreatmentSolution Treatment (Annealing) Heat to
950-1120°C and cool rapidly for maximum corrosion resistance.
321 stainless steel plate temperatures, reducing to about 150mg/L at 60°C. Consult hao
Technical Assistance for specific environmental recommendations.
This treatment follows normal solution treatment. Heat to approx
870-890°C for 2 hours 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. The exact treatment must
be agreed between supplier and purchaser.Stress Relief Heat to
700°C for 1 to 2 hours and air cool. These grades cannot be
hardened by thermal treatment.
Welding Excellent weldability by all standard fusion methods, both
with and without filler metals. AS 1554.6 pre-qualifies welding of
321 and 347 with Grades 347 or 347Si rods or electrodes.
"Dual Certification"Plate is commonly dual-certified as 321 and
321H, suitable for high temperature applications.Typical
ApplicationsExpansion joints. Bellows. Furnace parts. Heating
element tubing. Heat exchangers. Screens for high temperatures.
Spiral welded tube for burner pipes and flues.
Aerospace – piston engine manifolds
Food Processing – equipment and storage
Petroleum Refining – polythionic acid service
Waste Treatment – thermal oxidizers
1. Unit weight: 2-3tons per package or as client request.
2. Packing Type: strong wooden pallet and steel strip
reinforcement, or as clients' request.