**Product** | **ASTM Standard**
---|---
Bar | B 581
Plate, Sheet, and Strip | B 582
Seamless Pipe and Tube Fittings | B 622
Welded Nominal Pipe | B 619, B 775
Welded Tube | B 626, B 751
Welded Fittings | B 366
Forged or Rolled Pipe Flanges and Forged Fittings | B 462
Billet and Bar for Forging | B 472
### **Chemical Composition (%)**
Element | Ni | Cr | Fe | Mo | W | Co | C | Mn | Si | P | S | Cu | Nb+Ta
---|---|---|---|---|---|---|---|---|---|---|---|---|---
**Min** | Bal. | 28.0 | 13.0 | 4.0 | 1.5 | - | - | - | - | - | - | 1.0 | 0.30
**Max** | - | 31.5 | 17.0 | 6.0 | 4.0 | 5.0 | 0.030 | 1.5 | 0.80 | 0.040 | 0.020 | 2.4 | 1.50
### **Characteristics**
Hastelloy® G-35 is an upgraded version of G-30, offering **exceptional corrosion resistance** in wet-process phosphoric acid production environments used in fertilizer manufacturing. It **significantly outperforms G-30 and stainless steels** in such conditions. The alloy also resists **localized corrosion and chloride-induced stress corrosion cracking (SCC)**.
Its **high chromium content** provides outstanding resistance to **nitric acid and nitric acid mixtures**, while the **elevated molybdenum content** ensures moderate resistance to **reducing acids**. Unlike other Ni-Cr-Mo alloys, Hastelloy® G-35 exhibits **excellent resistance to dealloying corrosion in hot caustic soda (NaOH) environments**.
### **Applications**
- Evaporators in wet-process phosphoric acid production
- Pickling equipment using **nitric acid/hydrofluoric acid mixtures**
- Caustic soda neutralization systems
- Chemical processing systems involving **nitric acid and chlorides**
**Note**: *Hastelloy®, G-35, and G-30 are registered trademarks of Haynes International, Inc.*
*(Formatted for technical clarity with key properties and applications highlighted.)*
