Hangbo Alloy Group
Shanghai · Est. 2012
UNS N06030 / W.Nr. 2.4603 — High-chromium nickel-iron-molybdenum-copper alloy engineered for outstanding resistance to phosphoric acid, sulfuric acid, and mixed oxidizing-reducing environments.
Hastelloy G-30 (UNS N06030 / W.Nr. 2.4603) is a high-chromium nickel-iron-molybdenum-copper alloy specifically developed for the fertilizer industry and other applications involving aggressive phosphoric acid environments. With a chromium content of 28-31.5% — among the highest of any nickel alloy — G-30 offers outstanding resistance to oxidizing acids including phosphoric, nitric, and sulfuric acids, as well as excellent performance in mixed acid environments where both oxidizing and reducing conditions exist simultaneously.
The defining metallurgical feature of Hastelloy G-30 is its unique balance of high chromium for oxidizing acid resistance, combined with molybdenum, tungsten, and copper for reducing acid and localized corrosion resistance. This dual capability makes it uniquely suited for wet-process phosphoric acid (WPA) production, where the acid contains not only H₃PO₄ but also hydrofluoric acid, hydrochloric acid, and fluoride impurities that attack conventional stainless steels and even many nickel alloys.
Unlike the Hastelloy C-family alloys that excel in reducing environments, or the B-family alloys optimized for hydrochloric acid, G-30 occupies a specialized niche where oxidizing acids predominate but reducing acid contaminants are also present. Its high iron content (13-17%) reduces raw material cost compared to high-nickel alloys, while its performance in phosphoric acid service is superior to stainless steels, Alloy 20, and Hastelloy G-3.
At Hangbo Alloy Group, Hastelloy G-30 is supplied in plates, sheets, bars, seamless tubes, welded tubes, fittings, and welding wire per ASTM, ASME, and DIN/EN specifications. We support fertilizer plant operators, phosphoric acid producers, and chemical processors with mill-direct supply, full certification, and custom fabrication services.
The chemistry of Hastelloy G-30 is carefully balanced to provide exceptional resistance to phosphoric acid and other oxidizing acids, while maintaining good fabricability and cost-effectiveness. The high chromium content is the foundation of its oxidizing acid resistance, while molybdenum, tungsten, and copper address reducing acid contaminants.
| Element | Min % | Max % |
|---|---|---|
| Nickel (Ni) | Balance | Balance |
| Chromium (Cr) | 28.0 | 31.5 |
| Iron (Fe) | 13.0 | 17.0 |
| Molybdenum (Mo) | 4.0 | 6.0 |
| Tungsten (W) | 1.5 | 4.0 |
| Copper (Cu) | 1.0 | 2.4 |
| Cobalt (Co) | — | 5.0 |
| Carbon (C) | — | 0.030 |
| Manganese (Mn) | — | 1.5 |
| Silicon (Si) | — | 1.0 |
| Phosphorus (P) | — | 0.040 |
| Sulfur (S) | — | 0.020 |
Hastelloy G-30 has a face-centered cubic (FCC) austenitic structure in the solution-annealed condition. Its physical properties are comparable to other high-chromium nickel alloys, facilitating design calculations and welding compatibility.
| Property | Value | Unit |
|---|---|---|
| Density | 8.22 | g/cm³ |
| Melting Range | 1260 – 1345 | °C |
| Specific Heat (20°C) | 450 | J/kg·K |
| Thermal Conductivity (20°C) | 11.0 | W/m·K |
| Electrical Resistivity (20°C) | 1.18 | μΩ·m |
| Modulus of Elasticity (20°C) | 200 | GPa |
| Mean CTE (20–100°C) | 12.0 | μm/m·°C |
| Mean CTE (20–600°C) | 14.5 | μm/m·°C |
| Magnetic Permeability | 1.003 | (non-magnetic) |
Hastelloy G-30 is supplied in the solution-annealed condition, typically heat treated at 1100-1150°C followed by rapid cooling. The alloy exhibits excellent ductility and toughness, with elongation around 45% that allows bending, forming, and moderate cold working.
| Property | Annealed Value |
|---|---|
| Tensile Strength | 690 MPa (100 ksi) |
| Yield Strength (0.2% offset) | 310 MPa (45 ksi) |
| Elongation in 2 inches | 45% |
| Reduction of Area | 50% |
| Hardness | 90 HRB |
| Charpy V-notch Impact (RT) | 150 J min |
Hastelloy G-30 was specifically developed to resist the complex corrosive conditions found in wet-process phosphoric acid production and other mixed acid environments. Its performance in these demanding applications is superior to stainless steels, Alloy 20, and even Hastelloy G-3.
Wet-process phosphoric acid (WPA) is produced by reacting phosphate rock with sulfuric acid, resulting in phosphoric acid contaminated with hydrofluoric acid, hydrochloric acid, fluoride ions, and chloride ions. These impurities make WPA far more corrosive than pure phosphoric acid. Hastelloy G-30's high chromium content provides excellent resistance to the oxidizing phosphoric acid, while molybdenum and copper address the reducing acid contaminants. In commercial WPA containing fluoride and chloride, G-30 typically exhibits corrosion rates 5-10 times lower than Type 316L stainless steel and significantly lower than Hastelloy G-3.
Hastelloy G-30 offers good resistance to sulfuric acid across a wide concentration range, particularly in the medium-to-high concentration range where oxidizing conditions prevail. The copper addition (1-2.4%) enhances resistance to sulfuric acid, an effect well-known in copper-bearing nickel alloys. However, for strongly reducing sulfuric acid environments, Hastelloy C-276 or B-3 may be preferred.
The exceptionally high chromium content (28-31.5%) gives Hastelloy G-30 outstanding resistance to nitric acid at all concentrations up to the boiling point. This performance approaches that of high-silicon stainless steels and titanium in nitric acid service, while offering far superior resistance to the reducing acid contaminants often present in mixed acid streams.
In mixed acid environments containing combinations of phosphoric, sulfuric, nitric, and hydrochloric acids — common in chemical processing and fertilizer production — Hastelloy G-30 offers a unique combination of oxidizing and reducing acid resistance. Its balanced chemistry ensures that neither oxidizing nor reducing components cause catastrophic attack.
Hastelloy G-30 is selected wherever phosphoric acid or mixed oxidizing-reducing acids are present. Its field-proven performance has made it a standard material in several demanding industries.
Hangbo Alloy Group supplies Hastelloy G-30 in the full range of product forms required by fertilizer, chemical processing, and pollution control industries. Material is supplied in the solution-annealed condition with EN 10204 3.1 mill test certificates and full traceability.
Hastelloy G-30 has excellent weldability by gas tungsten arc welding (GTAW/TIG), gas metal arc welding (GMAW/MIG), and shielded metal arc welding (SMAW). Its austenitic structure and moderate work-hardening rate make it more fabricable than many high-nickel alloys.
| Standard | Description |
|---|---|
| ASTM B581 | Bar, Rod, and Wire |
| ASTM B582 | Plate, Sheet, and Strip |
| ASTM B622 | Seamless Pipe and Tube |
| ASTM B619 / B775 | Welded Pipe |
| ASTM B626 / B751 | Welded Tube |
| ASTM B366 | Fittings |
| ASTM B564 | Forgings |
| ASME SB-581 / SB-582 / SB-622 | Boiler and Pressure Vessel Code |
| DIN/EN W.Nr. 2.4603 | German/European Material Designation |
Shanghai Hangbo Alloy Group is a professional manufacturer and global supplier of Hastelloy G-30 (UNS N06030 / W.Nr. 2.4603). We provide plates, sheets, bars, seamless tubes, welded tubes, fittings, and welding wire with full material certification per ASTM, ASME, and EN standards. Mill-direct pricing, ISO 9001:2015 quality system, and fast delivery to 50+ countries worldwide.
Hastelloy G-30 (UNS N06030 / W.Nr. 2.4603) is a high-chromium nickel-iron-molybdenum-copper alloy with outstanding resistance to phosphoric acid, sulfuric acid, and nitric acid. It was specifically developed for the fertilizer industry, where equipment must withstand aggressive wet-process phosphoric acid containing HF, HCl, and fluoride impurities.
Nominal composition: Ni balance (min 43%), Cr 28.0–31.5%, Fe 13.0–17.0%, Mo 4.0–6.0%, W 1.5–4.0%, Cu 1.0–2.4%, Co max 5.0%, C max 0.030%, Mn max 1.5%, Si max 1.0%. The high chromium provides oxidizing acid resistance, while Mo, W, and Cu enhance reducing acid and localized corrosion resistance.
Hastelloy G-30 has a density of approximately 8.22 g/cm³ (0.297 lb/in³) and a melting range of 1260–1345°C (2300–2450°F).
Typical annealed properties: tensile strength ~690 MPa (100 ksi), yield strength ~310 MPa (45 ksi), elongation ~45%, hardness ~90 HRB. The alloy exhibits excellent ductility and can be readily formed and welded.
Key standards: ASTM B581 (bar/rod/wire), ASTM B582 (plate/sheet/strip), ASTM B622 (seamless pipe/tube), ASTM B619/B775 (welded pipe), ASTM B626/B751 (welded tube), ASTM B366 (fittings), ASTM B564 (forgings), and W.Nr. 2.4603.
Hastelloy G-30 resists phosphoric acid through its high chromium (30%) and molybdenum (5%) content, which form protective oxide and molybdate films. The copper addition (2%) further enhances resistance to sulfuric acid impurities. In commercial phosphoric acid containing fluoride and chloride contaminants, G-30 typically exhibits corrosion rates 5-10 times lower than stainless steels.
Hastelloy G-30 is suitable for continuous service up to 450°C (840°F) in corrosive environments. In phosphoric acid service, it is typically used up to the boiling point of the acid concentration. For oxidizing service at higher temperatures, its high chromium content provides good oxidation resistance up to 1000°C in air.
Primary applications: wet-process phosphoric acid production equipment (reactors, evaporators, heat exchangers, pumps, valves), fertilizer manufacturing, sulfuric acid pickling lines, nitric acid processing, mixed acid chemical processing, pollution control scrubbers, ore processing leaching equipment, and nuclear fuel reprocessing.
Yes, Hastelloy G-30 has excellent weldability using GTAW, GMAW, and SMAW processes. Matching filler metals such as ERNiCrMo-11 or ENiCrMo-11 are recommended. No preheat is required, and post-weld heat treatment is generally not necessary for corrosion resistance.
Hangbo Alloy Group supplies Hastelloy G-30 in round bars, plates/sheets/strips, seamless tubes/pipes, welded tubes/pipes, fittings, forgings, and welding wire. All products are delivered with EN 10204 3.1 mill test certificates and full traceability.
Hastelloy G-30 has higher chromium (30% vs 22% in G-3) and better overall corrosion resistance in oxidizing and mixed acid environments. Hastelloy G-35 was developed as an evolution with even higher chromium (33%) for improved WPA resistance. G-30 remains a cost-effective choice for many phosphoric acid applications where G-35's marginal improvement does not justify the additional cost.
Hastelloy G-30 is a premium specialty alloy. Typical mill-direct pricing ranges from $30–50/kg for bars, $40–65/kg for plates, and $55–90/kg for seamless tubes, depending on size and quantity. Lead times are typically 8–12 weeks for custom mill orders; Hangbo Alloy maintains strategic inventory for 2–4 week delivery. MOQ is generally 50 kg for stock sizes and 200–500 kg for custom sizes. Contact hangbo@nickel-alloy.com for a competitive quote.
Request a quotation for Hastelloy G-30 plates, tubes, bars, or welding wire for fertilizer production, phosphoric acid processing, or mixed acid applications. We stock standard sizes and accept custom orders.