SUS321 stainless steel plate haosteel hot cold rolled 1550mm width mill finish length can cut
Description:
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.
Specified Properties
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 (%)
| Grade | C | Mn | Si | P | S | Cr | Ni | N | Other | |
| 321 | min. max |
- 0.08 |
- 2.00 |
- 0.75 |
- 0.045 |
- 0.030 |
17.0 19.0 |
9.0 12.0 |
- 0.10 |
Ti=5(C+N) 0.70 |
| 321H | min. max |
0.04 0.10 |
- 2.00 |
- 0.75 |
- 0.045 |
- 0.030 |
17.0 19.0 |
9.0 12.0 |
- |
Ti=4(C+N) 0.70 |
| 347 | min. max |
- 0.08 |
- 2.00 |
- 0.75 |
- 0.045 |
- 0.030 |
17.0 19.0 |
9.0 13.0 |
- |
Nb=10(C+N) 1.0 |
Mechanical Property Specification
|
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 |
||||
|
321 |
515 |
205 |
40 |
95 |
217 |
|
321H |
515 |
205 |
40 |
95 |
217 |
|
347 |
515 |
205 |
40 |
92 |
201 |
|
321H also has a requirement for a grain size of ASTM No 7 or coarser. |
|||||
Physical Properties (typical values in the annealed condition)
| Grade | Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion | Thermal Conductivity |
Specific Heat 0-100°C ( J/kg.K) |
Electrical Resistivity (nW.m) |
|||
|
0-100°C (mm/m/°C) |
0-315°C (mm/m/°C) |
0-538°C (mm/m/°C) |
at 100°C (W/m.K) | at 500°C (W/m.K) | |||||
| 321 | 7900 | 193 | 16.6 | 17.2 | 18.6 | 16.1 | 22.2 | 500 | 720 |
Grade Specification Comparison
| Grade |
UNS No |
Euronorm | Swedish SS | Japanese JIS | |
| No | Name | ||||
| 321 | S32100 | 1.4541 | X6CrNiTi18-10 | 2337 | SUS 321 |
| 321H | S32109 | 1.4878 | X8CrNiTi18-10 | - | SUS 321H |
| 347 | S34700 | 1.4550 | X6CrNiNb18-10 | 2338 | SUS 347 |
Heat Resistance
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.
Common Applications
Aerospace – piston engine manifolds
Chemical Processing
Expansion Joints
Food Processing – equipment and storage
Petroleum Refining – polythionic acid service
Waste Treatment – thermal oxidizers
Export Packing:
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.
