Hastelloy C22 (UNS N06022) and S32750 Pipe Manufacturer, Supplier. Contact us to get free quote and sample!
Hastelloy C22 (UNS N06022) and S32750 represent two divergent philosophies in corrosion engineering. The nickel-based C22 delivers uncompromising resistance to boiling acids and wet chlorine – at 3x the cost of duplex alternatives. Meanwhile, S32750's dual-phase microstructure achieves 620MPa yield strength for structural marine applications, yet it also has weakness.
Chemical composition of Hastelloy N010276 pipe and super s32750 pipe
| Element | Ni | C | Mo | Mn | Si | Fe | P | S | Co | Cr | N |
| Hastelloy C276 | Balance | 0.010 max | 15.00 – 17.00 | 1.00 max | 0.08 max | 4.00 – 7.00 | 0.04 max | 0.03 max | 2.5 max | 14.50 – 16.50 | - |
| S32750 | 6.0-8.0 | 0.03max | 3.0-5.0 | 1.20max | 0.80max | Balance | 0.035max | 0.02max | - | 24.0-26.0 | 0.24-0.32 |
Mechnical and physical properties difference bewteen Alloy c22 and alloy s2507
| Comparison Dimension | Hastelloy C22 (UNS N06022) | S32750 (UNS S32750) |
| Density (g/cm³) | 8.9 | 7.8 |
| PRE Value | ~46 | >40 |
| Yield Strength | 310 MPa | 550-620 MPa (77% higher) |
| Tensile Strength | 690 MPa | 790-850 MPa (23% higher) |
| Hardness (HB) | 200 HB | 310 HB (55% higher) |
| High-Temp Performance (300°C) | Retains 85% strength | Strength drops to 457 MPa |
| Low-Temp Toughness | Maintains ductility at -196°C | Risk of ductile-brittle transition |
| Thermal Expansion Coeff. (×10⁻⁶/°C) | 6.9 (30-400°C) | 14.0 (30-400°C) |
hast. c276 and s32750 pipe corrosion resistance
c276 steel Acidic environment
In boiling hydrochloric acid (1%), the corrosion rate of Hastelloy C22 is only 0.02 mm/y, while that of S32750 is as high as 5.41 mm/y in this environment - a difference of 270 times.
hastelloy c276 uns Chloride
Pitting resistance equivalent (PRE): Hastelloy C22's PRE≈46, S32750＞40, numerically C22 is superior.
Real seawater performance: Super duplex stainless steel S32750's pitting rate in normal temperature seawater is equivalent to C22, but the cost is only 1/3 of that.
Temperature critical point: When the medium temperature is＞60℃ and Cl⁻＞50000ppm, S32750 may suffer from crevice corrosion, and C22 performs better.
UNS N10276 tube and UNS S32750 pipe Special corrosion types
Stress corrosion cracking (SCC): Hastelloy C22 is almost immune to SCC in high-temperature aqueous solutions containing chloride ions, and S32750 needs to control the use temperature to ＜80℃.
Post-weld intergranular corrosion: Alloy C22's extremely low carbon (C≤0.015%) design ensures corrosion resistance in the welding area, S32750 needs to strictly control the temperature between welds to ＜100℃.
Hastelloy c276 and super duplex 2507 pipe Manufacturer, Supplier.
HT PIPE is a leading stockist and global exporter with over 15 years of expertise in international trade. We supply Hastelloy C276 pipe and Alloy 2507 pipes, plates, round bars, and a comprehensive range of pipe fittings, flanges, and valves. Contact us now for free quotes and personalized product information.
