Hastelloy G-35 Pipe(UNS N06035)
Hastelloy G-35 Pipe(UNS N06035)
Hastelloy G-35 pipe (UNS N06035) is a nickel-based corrosion-resistant product specifically developed for wet-process phosphoric acid (WPA) evaporators and highly oxidizing acidic environments. Developed based on G-30 alloy by increasing chromium content and optimizing trace element balance, it has become a benchmark material for critical piping systems in industries such as phosphate chemical engineering, nuclear fuel reprocessing, and petrochemicals.
G-35 alloy pipe is available in both seamless and welded forms, fully meeting piping requirements under various pressure ratings and temperature conditions.
Tests conducted in actual process solutions demonstrate that G-35 alloy pipe performs significantly better than other metallic materials in acidic environments. Its uniform corrosion rate is typically much lower than that of 316L stainless steel, Alloy 20, Hastelloy C-276, and G-30 alloy pipe. This significantly extends the service life of evaporator tube bundles and reduces the frequency of downtime maintenance.
The high chromium and molybdenum content endows it with excellent resistance to localized corrosion, and its critical crevice corrosion temperature (CCT) is much higher than that of G-30 or 625 alloy pipe. Effectively resists stress corrosion cracking caused by chlorides-a property superior to all austenitic stainless steel pipes.
Pipe Execution Standards
| Product Form | ASTM/ASME | Scope of Application |
| Seamless pipe | ASTM B622 / SB 622 | Seamless pipes for general corrosive service conditions |
| Nominal welded pipe | ASTM B619 / SB 619 | Large-diameter welded pipe (NPS ≥ 1/2) |
| Welding pipes | ASTM B626 / SB 626 | Small-diameter welded pipe (for heat exchangers) |
| Pipe fittings | ASTM B366 / SB 366 | Elbows, tees, reducers, and pipe caps |
Price and Specification Reference
Pipe Specification Range:
Seamless Pipe
Typical outer diameter range: Generally covers sizes from very small to medium diameters; common upper limits range from Φ3mm to Φ114mm.
Welded Pipe
Typical outer diameter range: A wider range covering everything from small to large diameters; common outer diameters range from 6mm to 630mm.
Based on current market conditions, we can provide a reference price range of $45–$100 per kilogram.
However, the specific quote will depend on the required specifications and standards, as well as current market fluctuations.
Note: This information is for reference only; the final price is subject to the order. The data are typical values and are not guaranteed. The buyer is responsible for verifying their applicability. Prices may be affected by market fluctuations and exchange rates; we reserve the right to adjust prices. Please obtain final confirmation before placing your order.
Chemical Composition
| Element | ％ |
| Ni | 58 Balance |
| Cr | 33.2 |
| Mo | 8.1 |
| Fe | max.2.0 |
| W | max.0.6 |
| Si | max.0.6 |
| Mn | max.0.5 |
| Cu | max.0.3 |
| Co | max.1.0 |
| C | max.0.05 |
| Al | max.0.4 |
Physical properties(RT)
| Density | 8.22 g/cm3 |
| Melting point range | 1332-1361°C |
| Resistivity | 1.18 µohm.m |
| Thermal conductivity | 10 W/m.°C |
| Coefficient of thermal expansion(21-600°C) | 14.1 µm/m.°C |
Pipe manufacturing process
Dual-process smelting
The production of high-quality G-35 alloy typically employs a dual-process method combining vacuum induction melting (VIM) with electroslag remelting (ESR) or vacuum arc remelting (VAR) to achieve extremely high purity.
Hot forming
Seamless tubes are primarily formed through hot extrusion. The temperature window for hot forming is narrow; for example, during forging, the recommended initial forging temperature is 1204°C, and the final forging temperature should not be lower than 954°C to ensure deformation is completed within the appropriate range.
Cold drawing/rolling and intermediate annealing:
After hot extrusion, the tube undergoes multiple passes of cold drawing or cold rolling to reach the final dimensions, with strictly controlled solution annealing required between each pass. The final product is delivered in a cold-rolled + bright annealed state to ensure surface finish and dimensional accuracy; for example, the surface roughness can be controlled to Ra ≤ 0.4μm.
Note: All technical data, performance parameters, specifications, and processing information regarding Hastelloy® G-35® tubing above are from industry technical reference materials and are for general reference only. Actual product performance is subject to the Material Testing Certificate (MTC) and the technical agreement signed by both parties.
We at the Lork Group are dedicated to providing you with excellent service. Whether you require customization or consultation, please don't hesitate to contact us!
Lork Group
Marketing Operations Department
Email: layla@lorkgroup.com
WhatsApp: +86 199 3707 5488
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