Hastelloy G-30 (UNS N06030) Supplier – Certified Bars, Tubes & Plates for Phosphoric Acid Service | Shanghai Hangbo Alloy Group
Date: 2026年7月17日 Categories: News Views: 350
By Shanghai Hangbo Alloy Group Co., Ltd. | ISO 9001:2015 | Est. 2012 | Shanghai, China
Contact: sales@hangboalloy.com | hangbo@nickel-alloy.com | WhatsApp: +86 13611656360
Quick Answer: What Is Hastelloy G-30?
Hastelloy G-30 (UNS N06030 / W.Nr. 2.4603) is a specialized high-chromium nickel-iron superalloy that contains approximately 30% chromium — one of the highest levels in any commercial wrought nickel alloy. This extreme chromium content was purpose-built to provide the best available resistance to wet-process phosphoric acid (WPA), the dominant fertilizer production route, as well as hot concentrated nitric acid and mixed oxidizing acid streams. Shanghai Hangbo Alloy Group supplies Hastelloy G-30 in precision round bars, seamless tubes, and plates, with full ASTM B581/B582/B622 certification and complete heat-number traceability.
Key Properties at a Glance
| Property | Value |
|---|---|
| UNS Number | N06030 |
| W.Nr. | 2.4603 |
| Density | 8.22 g/cm³ (0.297 lb/in³) |
| Melting Range | 1330 – 1370 °C (2425 – 2500 °F) |
| Max Service Temp. (Structural) | 425 °C (800 °F) |
| Tensile Strength (RT) | ≥ 690 MPa (100 ksi) |
| Yield Strength (RT, 0.2%) | ≥ 283 MPa (41 ksi) |
| Elongation (RT) | ≥ 40% |
| Thermal Conductivity | 10.2 W/m·K at 100 °C |
| Key Standards | ASTM B581, B582, B622; ASME SB-581, SB-582, SB-622 |
The Phosphoric Acid Problem: Why "Replace Every 6 Months" Became "Install Once"
Phosphoric acid is the lifeblood of global agriculture, but it is also one of the most deceptive corrosive media on the planet. Standard stainless steels fail, duplex alloys fail, and even some high-nickel alloys fail in specific acid plant conditions. Here is what we see in the real world.
Pain Point 1: The Wet-Process Fluoride Hidden Attack
Wet-process phosphoric acid (WPA) is not pure H₃PO₄. It contains residual sulfuric acid (H₂SO₄), hydrofluoric acid (HF), and fluorosilicic acid from the phosphate rock ore. Standard super duplex 2507 or SS 316L will pit within weeks because the fluoride ions strip away the passive chromium oxide film. Hastelloy G-30 resists this because its 30% chromium content builds back that passive layer faster than the fluoride can strip it.
Pain Point 2: "We specified C-276 because it was available — big mistake."
C-276 is a remarkable alloy for reducing acids (HCl, H₂SO₄), but phosphoric acid at evaporation temperatures is an oxidizing environment. C-276 has only ~16% chromium; it simply cannot hold a stable passive film in hot, oxygenated phosphoric acid. We have replaced entire evaporator tube bundles for clients who were sold C-276 by traders who didn't understand the oxidizing/reducing chemistry distinction.
Pain Point 3: Nitric Acid Transpassive Corrosion in Nuclear Reprocessing
Concentrated hot nitric acid attacks most alloys by "transpassive" dissolution — it over-oxidizes the passive film and dissolves it. G-30's 30% chromium provides a massive reservoir of chromium to continuously regenerate the film, even in boiling HNO₃. This is why it is specified for nuclear fuel dissolvers where a leak is simply not an option.
Pain Point 4: "This was sold to us as G-30, but the Chromium is only 24%."
In the current market, some suppliers offer "G-30 equivalent" chemistry with lower chromium to save cost. If the chromium content on your MTC is below 28%, you do not have G-30. Insist on 100% PMI verification on arrival. Shanghai Hangbo includes dual OES reports — from the melt and from inspection — with every shipment.
How Shanghai Hangbo Alloy Group Solves Phosphoric Acid Failure
| Your Technical Pain Point | Our Engineering-Grade Solution | Your Operational Advantage |
|---|---|---|
| Fluoride pitting in WPA service | 30% Chromium verified on every heat (not approximated) | Multi-year evaporator tube life |
| Wrong alloy specified for oxidizing acid | Free metallurgical consultation before your PO is placed | Right alloy, first time |
| Nitric acid transpassive attack | Ultra-low impurity VIM+ESR melting | Safe for nuclear fuel cycle use |
| Fraudulent "sub-28% Cr" chemistry | Dual OES reports + PMI verification encouraged | You know what you're buying |
Product Overview: The Oxidizing Acid Specialist
Hastelloy G-30 (UNS N06030) was developed to fill a specific gap that no other commercial alloy could cover: the intersection of phosphoric acid, sulfuric acid contaminant, fluoride contaminant, and high temperature. The alloy's iron content (~15%) makes it more economical than higher-nickel cobalt alloys, while the 30% chromium content puts it in a league of its own for oxidizing resistance.
Metallurgical context: Why 30% Cr matters
- SS 316L (~17% Cr): Fails in WPA within months.
- C-276 (~16% Cr): Designed for reducing environments; poor oxidizing resistance.
- Alloy 31 (~27% Cr): Close competitor but lower Cr; less reserve for fluoride attack.
- Hastelloy G-30 (~30% Cr): Maximum chromium possible while maintaining a stable austenitic matrix.
Shanghai Hangbo Alloy Group (est. 2012) supplies G-30 to fertilizer plants, nuclear fuel reprocessing facilities, and chemical manufacturers across 32 countries. Our material comes with the documentation that your process engineers actually need, not a generic trader's certificate.
Executive Standards
| Product Form | ASTM | ASME | W.Nr./DIN |
|---|---|---|---|
| Round Bar / Forging | B581 / B564 | SB-581 / SB-564 | 2.4603 |
| Seamless Tube / Pipe | B622 | SB-622 | 2.4603 |
| Sheet / Plate / Strip | B582 | SB-582 | 2.4603 |
| Wire | B581 | — | 2.4603 |
Chemical Composition (wt.% per ASTM B581)
100% OES verified on every heat at Shanghai Hangbo Alloy Group.
| Element | Ni | Cr | Fe | Mo | W | Co | Cu | C | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | Bal. | 28.0 | 13.0 | 4.0 | 1.5 | — | 1.0 | — | — | — | — | — |
| Max | Bal. | 31.5 | 17.0 | 6.0 | 4.0 | 5.0 | 2.4 | 0.03 | 1.5 | 0.80 | 0.04 | 0.02 |
Critical owner's check: Chromium must be ≥ 28.0%. If your PMI gun reads 24–26%, you were supplied an inferior alloy masquerading as G-30. Reject the shipment.
Mechanical & Physical Properties
Room-Temperature Properties (Solution-Annealed)
| Property | Value | Standard |
|---|---|---|
| Tensile Strength | ≥ 690 MPa (100 ksi) | ASTM B581 |
| Yield Strength (0.2%) | ≥ 283 MPa (41 ksi) | ASTM B581 |
| Elongation | ≥ 40% | ASTM B581 |
| Hardness | ≤ 100 HRB | — |
| Density | 8.22 g/cm³ | — |
| Specific Heat | 450 J/kg·K | — |
High-Temperature Strength Retention
| Temp (°C) | Tensile Str. (MPa) | Yield Str. (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 760 | 360 | 52 |
| 200 | 680 | 300 | 55 |
| 400 | 610 | 260 | 58 |
| 600 | 540 | 215 | 62 |
Heat Treatment: The Passivation Maximizer
Hastelloy G-30 is used exclusively in the solution-annealed condition.
- Temperature: 1121 °C – 1177 °C (2050 °F – 2150 °F).
- Hold Time: 30–60 minutes per 25mm section thickness.
- Cooling: Water quench mandatory. The 28–31.5% chromium content means the alloy has a high driving force for secondary phase precipitation. If cooling is slower than a water quench, sigma phase or M₂₃C₆ carbides will form at grain boundaries, reducing both ductility and nitric acid resistance by 50% or more.
- Grain Size: ASTM No. 4–6, confirmed on every production batch.
- The Hangbo standard: We record furnace time-temperature data for every annealing cycle and provide it with your MTC on request. This is not industry standard — it's our standard.
How Shanghai Hangbo Produces Hastelloy G-30
1. Round Bars (Standard Delivery: 5–15 business days from stock)
- VIM + ESR Dual-Melt: Ensures carbon ≤ 0.03% and chromium homogeneity across the entire ingot. Without ESR, macro-segregation of chromium can create local low-Cr zones.
- Precision Hot Forging: 1040–1200 °C; controlled reduction to achieve ASTM grain size 4–6.
- Solution Anneal + Water Quench: 1150 °C anneal, water quench within 3 minutes; computer-recorded.
- 100% UT + OES Check: Ultrasonic inspection per ASTM A388; OES re-check on bar ends; Ra ≤ 0.8 µm finish.
2. Seamless Tubes (Standard Delivery: 5–20 business days)
- ESR Billet Extrusion: 1100–1150 °C hot extrusion.
- Multi-pass Cold Reduction: Pilger or draw to final OD/WT; ≤20% reduction per pass.
- Hydrogen Annealing: 1150 °C in protective atmosphere; bright, passive ID surface.
- 100% NDT: ECT (ASTM E309) + hydrostatic + visual ID inspection — each individual tube.
3. Plates & Sheets (Standard Delivery: 7–21 business days)
- Hot Rolling + Cold Finish: Slab → intermediate → precision gauge.
- Solution Anneal + Pickling: 1150 °C anneal; HNO₃/HF pickling for White surface finish.
- UT + Flatness + Cut: UT per ASTM A578; ≤ 3 mm/m flatness; waterjet or laser cut.
Industry Applications
| Industry | Typical Component | Why G-30 Is Specified | Hangbo Track Record |
|---|---|---|---|
| Fertilizer | Phosphoric acid evaporator tubes, agitators | Survives fluoride + H₂SO₄ in WPA | Supplied to 4+ fertilizer complexes globally |
| Nuclear | Spent fuel dissolvers, HNO₃ heating coils | Resists transpassive corrosion in boiling HNO₃ | Available with RCC-M documentation |
| Chemical | Mixed-acid piping, pickling tanks | Handles HNO₃/HF blends that destroy SS | Multiple chemical park installations |
| Mining | Gold/copper autoclave internals | Stable in high-pressure oxidizing acid leach | OEM-partnered with autoclave fabricators |
| Waste Treatment | Hazardous acid neutralization | Resists complex mixed oxidizing waste streams | Proven in European waste-to-energy plants |
Quality Assurance: 7-Stage Zero-Defect Protocol
- Incoming OES: Chromium (28–31.5%) verified on every incoming heat.
- VIM+ESR Audit: Process log verification — carbon ≤ 0.03%, tramp elements nil.
- 100% UT: ASTM A388 on all bars; ASTM A578 on all plates > 6mm.
- 100% ECT + Hydrostatic: Every tube tested for surface integrity and pressure tightness.
- Grain Size Certification: ASTM E112 No. 4–6 confirmed per heat.
- Mechanical Test: Tensile, yield, elongation on representative coupon per ASTM B581.
- Heat-Number Traceability: Permanent marking; full EN 10204 3.1 MTC; SGS/BV/TÜV inspection available.
Frequently Asked Questions
Q1: What is Hastelloy G-30 used for?
Primarily phosphoric acid (WPA) fertilizer plants, nuclear fuel reprocessing (nitric acid dissolvers), mixed-acid chemical processing, and high-pressure oxidizing autoclave leaching in mining.
Q2: What is the density of Hastelloy G-30?
8.22 g/cm³ (0.297 lb/in³).
Q3: What is the maximum service temperature?
For structural applications, approximately 425 °C (800 °F). For acid corrosion alone (no pressure load), it can be used at higher temperatures as long as the passive film remains stable.
Q4: What is the melting point?
1330 °C to 1370 °C (2425 °F to 2500 °F).
Q5: What is the tensile strength?
Minimum ≥ 690 MPa (100 ksi) at room temperature; typical Hangbo production 730–790 MPa.
Q6: What is the yield strength?
Minimum ≥ 283 MPa (41 ksi); typical 320–380 MPa.
Q7: What is the elongation?
Minimum ≥ 40% — excellent for cold-forming dished heads and reducer cones.
Q8: What heat treatment does it require?
Solution annealing at 1121 °C – 1177 °C followed by mandatory water quench. Slow cooling destroys corrosion resistance.
Q9: How does G-30 compare to C-276?
G-30 has nearly double the chromium (30% vs 16%), making it dramatically superior in oxidizing environments (phosphoric acid, nitric acid, ferric chlorides). C-276 is better in pure reducing environments (HCl).
Q10: What is the price per kg?
Market range: approximately $38–88 USD/kg depending on form and size. Contact sales@hangboalloy.com for a same-day competitive quote.
Q11: Is Hastelloy G-30 weldable?
Yes — excellent weldability with matching G-30 filler (ERNiCrMo-11). Low carbon prevents sensitization; as-welded components can go directly into phosphoric acid service.
Q12: What product forms does Shanghai Hangbo supply?
Round bars (6–400mm), seamless tubes (OD 6–219mm), plates (1–100mm), sheets, strips, and custom forgings.
Q13: How do I verify genuine G-30?
Check chromium on MTC must be ≥ 28.0%. Run PMI on arrival — if it reads 24–26%, reject. Verify heat-number match between product and certificate.
Q14: Does Shanghai Hangbo ship internationally?
Yes — 32 countries. DDP, DAP, FOB, CIF. Europe 18–25 days sea; Asia 10–15 days sea.
Q15: Can you supply for nuclear service?
Yes. We can provide G-30 with RCC-M nuclear code documentation and enhanced NDT on request.
Contact Shanghai Hangbo Alloy Group
Get a competitive quote within 10 minutes.
| Channel | Details |
|---|---|
| Website | www.nickel-alloy.com |
| Email (Sales) | sales@hangboalloy.com |
| Email (Tech) | hangbo@nickel-alloy.com |
| WhatsApp / Phone | +86 13611656360 |
| Address | Shanghai, China |
Shanghai Hangbo Alloy Group Co., Ltd. — Founded 2012 | ISO 9001:2015 | The Phosphoric Acid & Oxidizing Environment Specialist | 32 Countries
