ASTM B622 UNS N06035 Pipe (Hastelloy G-35 / Alloy G-35)
ASTM B622 UNS N06035 covers seamless pipes and tubes produced from a nickel-chromium-iron-molybdenum alloy known as Hastelloy G-35 or Alloy G-35. This grade is an advanced version of the G-series alloys, specifically engineered to deliver superior corrosion resistance in phosphoric acid, sulfuric acid, and mixed acid environments containing chlorides.
UNS N06035 pipes combine excellent fabricability, weldability, and mechanical stability, making them a preferred choice for fertilizer plants, chemical processing industries, and aggressive acid service applications.
Key Features
- Exceptional resistance to phosphoric and sulfuric acids
- Improved corrosion resistance over Hastelloy G-30
- High resistance to pitting and crevice corrosion
- Excellent weldability without post-weld heat treatment
- Good mechanical strength and toughness
- Reliable performance in chloride-containing environments
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N06035 |
| W.Nr | 2.4606 |
| DIN | NiCr30Fe15Mo |
| Trade Names | Hastelloy G-35, Alloy G-35 |
ASTM B622 UNS N06035 Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 32.0 – 35.0 |
| Iron (Fe) | 10.0 – 20.0 |
| Molybdenum (Mo) | 7.0 – 9.0 |
| Copper (Cu) | ≤ 0.8 |
| Cobalt (Co) | ≤ 2.0 |
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 1.50 |
| Silicon (Si) | ≤ 0.80 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.02 |
Hastelloy G-35 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 620 MPa (min) |
| Yield Strength (0.2% Proof) | 300 MPa (min) |
| Elongation | 40% (min) |
| Hardness | ≤ 95 HRB |
Alloy G-35 Physical Properties
| Property | Value |
|---|---|
| Density | 8.25 g/cm³ |
| Melting Range | 1320 – 1370°C |
| Thermal Conductivity | 11.0 W/m·K |
| Electrical Resistivity | 1.25 µΩ·m |
| Modulus of Elasticity | 205 GPa |
Type of ASTM B622 UNS N06035
- UNS N06035 Seamless Pipe
- UNS N06035 Seamless Tube
- Hot Finished Pipes
- Cold Drawn Pipes
- Bright Annealed Tubes
- Chemical Process Pipes
- Heat Exchanger Tubes
Applications
- Phosphoric acid production plants
- Fertilizer and agrochemical industries
- Sulfuric acid handling systems
- Chemical processing equipment
- Heat exchangers and condensers
- Scrubbers and pollution control units
- Petrochemical and refinery services
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