321 stainless steel is a Ni-Cr-Ti type austenitic stainless steel with abrasion resistance, high-temperature resistance, creep resistance, etc. It is used to manufacture wear-resistant acid container linings and pipelines of wear-resistant equipment.
321H stainless steel is stainless steel with a carbon C of 0.04~0.10.
321H stainless steel is a widely used stainless steel where parts are heated and exposed to corrosive atmospheres within the carbide precipitation temperature range (800°F-1500°F).
321 stainless steel is similar to 304 stainless steel, but has a higher nickel content and is stabilized with titanium.
Titanium reacts preferentially with the carbon in the steel and prevents chromium carbide from precipitating at the grain boundaries, thereby maintaining corrosion resistance by preventing chromium depletion near the grain boundaries when exposed to critical temperature ranges.
This grade responds well to cold work hardening. Has good welding characteristics; and generally does not require post-weld annealing to restore its excellent performance under various corrosive conditions.
Specifications of Stainless Steel Tube 321, 321H
| Product name | Stainless Steel Pipe |
| Grade | 321， 321H |
| Standard | ASTM A249, A240, A269, A213, A312, A268, A270, A554, 632, 688, JIS G4304, G4305, BS 1449, DIN17460, DIN 17441, etc |
| Length | Customizable |
| Outside Diameter | Within 700mm |
| Thickness | Customizable |
| Surface | Mirror/2B/Polished or Customized |
| Package | Clients' requirements and Standard export sea-worthy packing |
| Delivery time | Short delivery time |
Equivalent grades
| UNS | ASTM | JIS | DIN | EN | NF | BS |
| 321 | S32100 | SUS32 | 1.4541 | X6CrNiTi18-10 | z6cnt18-11 | 321s31,321s12 |
| 321H | S32109 | SUS321HTB | 1.4940 | X8CrNiTi18-10, X7CrNiTi18-10 | - | 321s20 |
Chemical Properties:
| % | Cr | Ni | C | Si | Mn | P | S | N | Ti | Fe |
| 321 | min:17.0 max:19.0 | min: 9.0 max:12.0 | max:0.08 | max:0.75 | max:2.0 | max:0.045 | max:0.03 | max:0.10 | min:5*(C+N) max:0.70 | Balance |
| 321H | min:17.0 max:19.0 | min: 9.0 max:12.0 | min:0.04 max:0.10 | min:18.0 max:20.0 | max:2.0 | max:0.045 | max:0.03 | max:0.10 | min:5*(C+N) max:0.70 | Balance |
Mechanical Properties:
| Grade | Tensile Strength ksi (min.) | Yield Strength 0.2% Offset ksi (min.) | Elongation - % in 50 mm (min.) | Hardness (Brinell) MAX |
| 321 | 75 | 30 | 40 | 217 |
Physical Properties:
| Density LBM/in3 | Coefficient of Thermal Expansion (min/in)-°F | Thermal Conductivity BTU/hr-ft-°F | Specific Heat BTU/LBM -°F | Modules of Elasticity (annealed)2-psi | |
| at 68 °F | at 68 – 212°F | at 68 – 1832°F | at 200°F | at 32 – 212°F | in tension (E) |
| 0.286 | 9.2 | 20.5 | 9.3 | 0.12 | 28 x 106 |
Corrosion Resistance
Exhibits good general corrosion resistance that is comparable to 304.
Developed for use in the chromium carbide precipitation range of 1800 – 1500°F (427 – 816°C).
Can be used for most dilute organic acids at moderate temperatures.
Pure phosphoric acid can be used at lower temperatures.
Can be used in dilute solutions up to 10% at high temperatures.
Resist polythionic acid stress corrosion cracking in hydrocarbon applications.
Use at moderate temperatures in caustic solutions that do not contain chloride or fluoride.
Does not perform well in chloride solutions (even at small concentrations) or sulfuric acid solutions.
321H can be easily welded and machined through standard shop fabrication practices.
Thermoforming
1. For forging, upsetting, and other hot working processes, the recommended operating temperature is 2100 – 2300°F (1149 – 1260°C).
2. The alloy is not suitable for operation at temperatures below 1700°F (927°C).
3. The material must be water-quenched or completely annealed after work to regain maximum corrosion resistance.
Cold forming
1. Good ductility and easy to form.
Welding
1. Easy to weld using most standard processes.
2. No post-weld heat treatment is required
