COMPREHENSIVE TECHNICAL ANALYSIS AND DATASHEET OF HASTELLOY G-30 (UNS N06030) FASTENING SYSTEMS
Hastelloy G-30 (officially designated as UNS N06030) is a premier nickel-chromium-iron superalloy, specifically engineered to provide outstanding resistance to "wet process" commercial phosphoric acid—one of the most complex and corrosive industrial chemicals. It represents a significant upgrade over previous generations (like Alloy G and G-3), utilizing a heavily boosted Chromium content (~30%) combined with substantial additions of Molybdenum, Copper, and Tungsten.
This complex multi-alloying strategy grants G-30 unparalleled versatility. It aggressively resists both highly oxidizing acids (nitric) and reducing acids (sulfuric), as well as complex mixed-acid environments containing fluorides and chlorides. It is the gold standard for fastening systems in agrichemical production, nuclear fuel reprocessing, and specialized mining operations where equipment is subjected to severe, multi-faceted chemical attack.
■ Product Overview & Specifications
Hastelloy G-30 fasteners are supplied in the solution-annealed condition to guarantee optimal microstructural homogeneity, ensuring maximum corrosion resistance and prevention of grain-boundary precipitation.
| Material Classification | Nickel-Chromium-Iron-Molybdenum-Copper Superalloy |
|---|---|
| UNS Designation | N06030 |
| Microstructure | Face-Centered Cubic (FCC) Austenitic |
| Magnetic State | Non-Magnetic |
| Density | ~8.22 g/cm³ (0.297 lb/in³) |
| Melting Range | 2460°F – 2550°F (1350°C – 1400°C) |
| Size Range | Metric: M6 to M80 | Imperial: 1/4" to 3" Custom U-bolts, heavy hex nuts, and precision machined components available. |
| Thread Types | UNC, UNF, 8UN, Metric Coarse, Metric Fine (Rolled threads strictly recommended) |
■ Proprietary Datasheet Download (GATED)
Access professional-grade technical data for Hastelloy G-30, including comprehensive iso-corrosion charts for commercial phosphoric acid, comparative pitting data against Alloy 625, and mixed-acid performance metrics.
Hastelloy G-30 (N06030) — Complete Technical Datasheet
Contains specific corrosion rates in mg/m² for nitric-hydrofluoric pickling baths, elevated temperature tensile curves, and ASME Section VIII design limits.
⬇ DOWNLOAD/VIEW FULL DATASHEET■ MTC Integration Section
Because G-30 is utilized in the most dangerous mixed-acid environments on Earth, absolute chemical precision is mandatory. Ananka Group guarantees metallurgical authenticity through rigorous documentation.
- EN 10204 Type 3.1: Detailed reporting of actual ladle chemical analysis, verifying the crucial high Chromium (~30%) and Tungsten/Copper balance, alongside mechanical property certification.
- EN 10204 Type 3.2: Third-party witness testing (e.g., TUV, BV, SGS) facilitated for critical agrichemical reactors and nuclear processing infrastructure.
■ Chemical Composition (UNS N06030)
The defining characteristic of G-30 is its massive 30% Chromium content. When combined with Molybdenum, Tungsten, and Copper, this creates a protective passive film that survives complex acid mixtures that destroy other superalloys.
| Nickel (Ni) | Chromium (Cr) | Iron (Fe) | Moly (Mo) | Tungsten (W) | Copper (Cu) | Carbon (C) |
|---|---|---|---|---|---|---|
| Balance (~43.0%) | 28.0 – 31.5 | 13.0 – 17.0 | 4.00 – 6.00 | 1.50 – 4.00 | 1.00 – 2.40 | 0.03 Max |
*Cobalt (5.00 Max) and Columbium+Tantalum (0.30 - 1.50) are also present to stabilize the alloy and prevent intergranular attack in the weld heat-affected zone.
■ Mechanical Properties
G-30 offers high structural strength combined with excellent ductility, allowing it to be used for heavy-duty pressure vessel fastening and complex structural bolting in chemical plants.
| Property | Solution Annealed Condition (Typical Minimums) |
|---|---|
| Tensile Strength (Min) | 85 ksi (586 MPa) |
| Yield Strength (0.2% Offset, Min) | 35 ksi (241 MPa) |
| Elongation in 2" (Min) | 30% |
| Hardness (Typical) | ~85 - 100 HRB |
■ Equivalent Grades & Designations
| Standard / System | Designation |
|---|---|
| UNS Designation | N06030 |
| Common Trade Name | Hastelloy G-30® (Trademark of Haynes International) |
| ASTM Fastener Specs | ASTM B581 (Bar), ASTM B582 (Plate) |
| European Equivalent | W.Nr. 2.4603 / NiCr30FeMo |
■ Corrosion Resistance Profile
Alloy G-30 is specifically selected when a chemical process involves multiple types of corrosive attack simultaneously:
- Commercial Phosphoric Acid: The absolute best-in-class performance against wet-process phosphoric acid, which contains abrasive silica and aggressive fluoride/chloride impurities.
- Mixed Acids: Exceptional resistance to nitric/hydrofluoric and nitric/hydrochloric acid mixtures used in pickling operations and nuclear reprocessing.
- Oxidizing Environments: The 30% Chromium provides near-immunity to hot nitric acid and oxidizing salts (like ferric and cupric chlorides).
- Localized Attack: Highly resistant to chloride-induced pitting, crevice corrosion, and stress corrosion cracking (SCC).
■ Applications & Industries
G-30 is the definitive choice for the world's most aggressive agrichemical and heavy-processing environments:
- Fertilizer Production: Agitator shafts, pump fasteners, and evaporator bolting for commercial phosphoric acid and superphosphate production.
- Metal Finishing: Fasteners for pickling baskets, hooks, and racks exposed to hot nitric-hydrofluoric acid baths.
- Nuclear Reprocessing: Structural bolting for dissolution tanks and evaporators handling highly radioactive mixed acids.
- Mining & Refining: Autoclave and pressure vessel fasteners for specialized ore leaching processes.
■ Compatible Fastener Assemblies
To prevent galvanic corrosion and ensure uniform chemical resistance, Hastelloy G-30 components must strictly be mated with identical G-30 hardware.
| External Threads (Hastelloy G-30) | Recommended Mating Component (Nuts) |
|---|---|
| Hastelloy G-30 Stud Bolts | Hastelloy G-30 Heavy Hex Nuts |
| Hastelloy G-30 Hex Bolts | Hastelloy G-30 Standard / Jam Nuts |
■ Torque & Installation Guidelines
Hastelloy G-30 is highly susceptible to severe thread galling (cold-welding) due to its "gummy" nickel-chromium matrix. The application of premium, chemically compatible anti-seize paste is strictly mandatory.
| Nominal Diameter | Threads Per Inch (UNC) | Target Torque — Lubricated (ft-lbs) |
|---|---|---|
| 1/2" | 13 | 45 - 55 |
| 5/8" | 11 | 90 - 110 |
| 3/4" | 10 | 150 - 180 |
| 1" | 8 | 360 - 410 |
■ Why Choose Ananka Group?
Ananka Group possesses the specialized machining expertise and metallurgical supply chains required to deliver flawless Hastelloy G-30 fastening solutions.
- Advanced Machining Protocols: G-30 work-hardens rapidly. We utilize specific low-speed, high-feed CNC machining with positive-rake tooling to ensure perfect thread profiles without inducing surface stress.
- Thread Rolling: We roll external and internal threads whenever physically possible, maximizing fatigue life and significantly reducing the risk of installation galling.
- 100% Traceability: Every G-30 fastener is stamped with its specific heat number, mapping directly back to authentic, premium mill certificates.
- Custom Engineered Hardware: Complete manufacturing of specialty U-bolts, heavy-duty studs, and precision valve stems for extreme chemical containment.
■ Frequently Asked Questions
1. Why is G-30 better for phosphoric acid than Alloy 625 or C-276?
While 625 and C-276 are excellent all-around superalloys, commercial "wet-process" phosphoric acid contains nasty impurities like fluorides, chlorides, and sulfuric acid. G-30 was specifically designed with a massive 30% Chromium boost and targeted Copper additions to survive this exact chemical mixture far better than standard high-molybdenum alloys.
2. How does G-30 differ from previous Alloy G-3?
G-30 is a massive upgrade over G-3. It increases the Chromium content from ~22% to ~30%, drastically improving its resistance to highly oxidizing acids (like nitric acid) and mixed acid environments, making it far more versatile across different chemical plants.
3. Does G-30 suffer from weld-decay (intergranular corrosion)?
No. Hastelloy G-30 is specifically stabilized with Columbium (Niobium) and Tantalum, and has very low carbon limits. This prevents the precipitation of chromium carbides during welding, meaning fasteners and fabricated parts maintain their full corrosion resistance in the as-welded condition.
4. Is Hastelloy G-30 magnetic?
No. Like almost all high-nickel superalloys, G-30 is fully austenitic and remains completely non-magnetic under all standard industrial conditions.