Hastelloy C276 / C22 / B2 Round Bars
Hastelloy is the trade name for a group of nickel-molybdenum and nickel-chromium-molybdenum alloys developed for the most aggressive chemical environments. Hastelloy C276 and C22 resist oxidising and reducing media alike, including wet chlorine, hypochlorite, ferric and cupric chlorides, and they are virtually immune to chloride pitting and stress corrosion cracking. Hastelloy B2 is a nickel-molybdenum alloy specifically for hydrochloric acid and other reducing acids at all concentrations and temperatures.
Nexforge Alloys supplies Hastelloy C276, C22 and B2 round bars in the solution annealed and rapidly quenched condition as required by ASTM B574. Bars are pickled or centreless ground and are supported by chemical analysis, tensile test and intergranular corrosion test certificates.
Hastelloy C276 (N10276), C22 (N06022) and B2 (N10665) round bars, 6 mm to 250 mm diameter, as per ASTM B574 / ASME SB574 with 3.1 certification.
Hastelloy Round Bar Specification
| Parameter | Details |
|---|---|
| Grades | Hastelloy C276 (UNS N10276, W.Nr. 2.4819), C22 (UNS N06022, W.Nr. 2.4602), B2 (UNS N10665, W.Nr. 2.4617) |
| Standards | ASTM B574, ASME SB574, ASTM B335 (B2), DIN 17752, NACE MR0175 / ISO 15156 |
| Size Range | 6 mm to 250 mm diameter |
| Length | Random 2 to 6 metres, or cut to length |
| Condition | Solution annealed and water quenched |
| Surface Finish | Pickled, rough turned, peeled, centreless ground |
| Tolerance | h9 / h10 / h11 or as per drawing |
| Testing | Chemical, tensile, hardness, IGC as per ASTM G28 Method A/B, UT on request |
| Certification | EN 10204 3.1 mill test certificate; 3.2 on request |
Chemical Composition (% by weight)
| Grade (UNS) | Ni | Mo | Cr | Fe | W | Co | Mn | V | C | Si | Others |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Hastelloy C276 (N10276) | Balance | 15.0 - 17.0 | 14.5 - 16.5 | 4.0 - 7.0 | 3.0 - 4.5 | 2.5 max | 1.0 max | 0.35 max | 0.01 max | 0.08 max | P 0.04, S 0.03 max |
| Hastelloy C22 (N06022) | Balance | 12.5 - 14.5 | 20.0 - 22.5 | 2.0 - 6.0 | 2.5 - 3.5 | 2.5 max | 0.5 max | 0.35 max | 0.015 max | 0.08 max | P 0.02, S 0.02 max |
| Hastelloy B2 (N10665) | Balance | 26.0 - 30.0 | 1.0 max | 2.0 max | - | 1.0 max | 1.0 max | - | 0.02 max | 0.10 max | P 0.04, S 0.03 max |
Mechanical Properties
| Grade | Condition | Tensile Strength (min) | 0.2% Yield Strength (min) | Elongation (min) | Density | Melting Range |
|---|---|---|---|---|---|---|
| Hastelloy C276 | Solution annealed | 690 MPa (100 ksi) | 283 MPa (41 ksi) | 40 % | 8.89 g/cm³ | 1325 - 1370 °C |
| Hastelloy C22 | Solution annealed | 690 MPa (100 ksi) | 310 MPa (45 ksi) | 45 % | 8.69 g/cm³ | 1357 - 1399 °C |
| Hastelloy B2 | Solution annealed | 760 MPa (110 ksi) | 350 MPa (51 ksi) | 40 % | 9.22 g/cm³ | 1330 - 1380 °C |
Values are minimum or typical figures as per the referenced standards and are for guidance only. Please refer to the mill test certificate supplied with the material for actual values.
Key Features
- C276 and C22: outstanding resistance to pitting, crevice corrosion and chloride SCC
- C22 offers the widest resistance to both oxidising and reducing chemicals of any Hastelloy grade
- B2 resists hydrochloric acid at all concentrations and temperatures up to boiling
- Low carbon and silicon prevent grain boundary precipitation in the heat affected zone after welding
Applications
- Agitator shafts, pump shafts and valve stems in chemical and pharmaceutical plants
- Flue gas desulphurisation (FGD) and pollution control equipment
- Chlorination systems, pulp and paper bleaching plants
- Acetic acid, sulphuric acid and hydrochloric acid process equipment
- Sour gas oil and gas production components (NACE MR0175)