|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ti |
|
321 |
≤0.08 |
≤2.00 |
≤0.75 |
≤0.045 |
≤0.03 |
17.00-19.00 |
- |
5*C-0.70 |
|
321H |
0.04-1.00 |
≤2.00 |
≤0.75 |
≤0.08 |
≤0.03 |
17.00-19.00 |
- |
4*C*0.60 |
Chemical Composition
Mechanical Properties
|
Grade |
Tensile Strength ksi(MPa) |
Yield Strength ksi(MPa) |
Elongation (% in 50mm) |
Hardness |
|
|
Rockwell |
Brinell (HB) |
||||
|
321 |
≥75(515) |
≥30(205) |
≥35 |
≤90HRB |
≤192HBW |
|
321H |
≥75(515) |
≥30(205) |
≥35 |
≤90HRB |
≤192HBW |
Grade Specification Comparison
|
Grade |
UNS No |
EN |
Gb |
JIS |
|
|
No |
Name |
||||
|
321 |
S32100 |
1.4541 |
X6CrNiTi18-10 |
0Cr18Ni11Ti |
SUS 321 |
|
321H |
S32109 |
1.4878 |
X10CrNiTi18-10 |
1Cr18Ni9Ti |
SUS 321H |
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.
Applications
- Typical applications include:
- Aircraft exhaust manifolds
- Expansion joints
- Bellows
- Furnace parts
- Heating element tubing
- Heat Exchangers
- Woven or welded screens for high temperature mineral processing
- Spiral Welded tube for burner pipes and flues
Testing
- EN 10204/3.1B, EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% Radiography Test Report
- 100% PMI
- Heat Treatment Charts
- Third Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate( Impact Testing, Flatten, Spin,Curve, Hardness, Intergranular ,Point corrosions, Grain size, ET,UT, HT...)
- Laboratory Test Certificate from Govt. Approved Lab
- ......
End of Pipe and Tube
- BE : Beveled end
- BBE : Bevel both ends
- BLE : Bevel large end
- BSE : Bevel small end
- TOE / POE = Treaded One End / Plain One End
- TOE / BOE = Treaded One End / Beveled One End
- POE / BOE = Plain One End / Beveled One End
- TBE = Treaded Both Ends
- PBE = Plain Both Ends
Packing
- Ply Wooden Boxes
- PE Fabric Bundles
- Standard seaworthy export packing
- Plastic Bags, or as required
Marking
- Supplier / Manufacturer Name or Custom Logo - on request
- Specification
- Material Grade
- Nominal Size
- Schedule or Wall Thickness
- Method of Manufacturing (Seamless or Welded)
- Heat Number
Marked Pipe Sample: XTD ASTM A312 TP321 SEAMLESS 42.2x 3.56*6000MM HEAT NO. 2023121205A15
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.
