Introduction

Hastelloy G-30 Alloy (UNS N06030 / Alloy G-30 / W.Nr. 2.4603) is a nickel-chromium-iron-molybdenum-copper alloy with the highest chromium content among the G‑series alloys. This high chromium nickel alloy provides exceptional resistance to oxidizing acids such as nitric and phosphoric acid, while its molybdenum and copper content extends protection into the reducing regime.

This corrosion resistant nickel alloy is widely used in commercial phosphoric acid service (wet process P₂O₅), sulfuric acid, nitric acid, and complex mixed acid environments including nitric/hydrochloric, nitric/hydrofluoric, and sulfuric acid mixtures. The alloy resists the formation of grain boundary precipitates in the heat‑affected zone, making it suitable for most chemical process applications in the as‑welded condition. 

This chemical processing alloy is the preferred material for fertilizer industry equipment, pickling operations, heat exchangers, pressure vessels, flue gas desulfurization systems, and nuclear fuel reprocessing facilities. Available in Hastelloy G-30 plate, sheet, strip, seamless pipe, tube, bar, round bar, rod, wire, forgings, flanges, pipe fittings, and fasteners, in hot rolled, cold rolled, cold drawn, solution annealed, and pickled conditions. 

Specifications & Process Options

Applications

1. Phosphoric Acid Service & Fertilizer Industry

• For wet process phosphoric acid (P₂O₅) evaporator tubes, concentrators, and heat exchanger components, Hastelloy G-30 for phosphoric acid delivers superior corrosion resistance over most other nickel and iron‑base alloys. The alloy’s high chromium content provides exceptional protection against the aggressive, fluoride‑containing phosphate rock digestion environment.

• For fertilizer industry equipment including phosphoric acid evaporators, superphosphoric acid concentrators, and NPK granulator scrubber components, Alloy G-30 plate and pipe withstand the corrosive effects of hot phosphoric acid, fluorides, and chlorides. This phosphoric acid resistant alloy is the standard material for P₂O₅ evaporator tubes and nitric acid‑based fertilizer production hardware.

• For phosphoric acid storage and transfer systems, Hastelloy G-30 seamless pipe eliminates pitting and crevice corrosion at welds and flanges, with resistance to grain boundary precipitates in the heat‑affected zone.

2. Sulfuric Acid & Nitric Acid Service

• For sulfuric acid production equipment, acid coolers, and interstage acid piping, Hastelloy G-30 for sulfuric acid outperforms most other nickel and iron‑base alloys in hot concentrated acid service. The alloy provides moderate resistance to reducing acids through its molybdenum and copper content.

• For nitric acid handling systems including tail gas heaters, ammonia burner tubes, and concentrated nitric acid piping, Nickel Alloy G-30 resists oxidizing acid attack in both dilute and fuming HNO₃ service. This nitric acid resistant alloy handles HNO₃/HF mixed acid streams in metal pickling operations.

• For acid handling systems in petrochemical and pesticide production, Hastelloy G-30 tube and pipe provide reliable performance in mixed acid environments containing nitric, hydrochloric, hydrofluoric, and sulfuric acids.

3. Pickling Equipment & Metal Processing

• For pickling operations in stainless steel and titanium processing, Hastelloy G-30 for pickling equipment withstands nitric‑hydrofluoric acid (HNO₃/HF) mixtures and hydrochloric acid‑based pickling baths. This acid resistant alloy maintains surface integrity and resists intergranular corrosion in as‑welded condition.

• For pickling tank liners, heating coils, and acid recovery systems, Alloy G-30 plate and sheet provide long‑term reliability in aggressive mixed acid environments.

4. Chemical Processing & Heat Exchangers

• For chemical processing reactors, heat exchangers, and piping systems handling complex oxidizing acid mixtures, Hastelloy G-30 for chemical processing offers superior corrosion resistance over most other nickel and iron‑base alloys.

• For heat exchangers and condenser tubing in fertilizer and chemical plants, Hastelloy G-30 tube provides high thermal conductivity with outstanding resistance to localized attack in phosphoric and sulfuric acid service.

• For pressure vessels in high‑temperature corrosive service, ASTM B582 Hastelloy G-30 plate combines fabricability, weldability, and elevated‑temperature corrosion resistance. The alloy’s resistance to grain boundary precipitates eliminates post‑weld heat treatment for most applications.

5. Nuclear Fuel Reprocessing & Pollution Control

• For nuclear fuel reprocessing equipment and radioactive waste management systems, Hastelloy G-30 for nuclear industry provides the corrosion resistance required for spent nuclear fuel dissolvers and waste processing vessels.

• For flue gas desulfurization systems, absorber towers, and pollution control equipment handling low‑pH, high‑chloride scrubber liquor, Alloy G-30 pipe and plate withstand aggressive wet scrubber environments.

6. Petrochemical & General Industrial Service

• For petrochemical processing equipment, reformer components, and catalytic regeneration systems, Hastelloy G-30 for petrochemical industry resists high‑temperature oxidation and chemical corrosion.

• For fasteners, valve components, pump shafts, and fittings requiring corrosion resistance in aggressive acid environments, Hastelloy G-30 bar, round bar, and forgings are machined into precision components with excellent mechanical properties.

FAQ – Hastelloy G-30 Alloy

Q: What is the difference between Hastelloy G-30 and Hastelloy C-276?

A: Hastelloy G-30 (UNS N06030) is a high chromium nickel alloy (28–31.5% Cr) specifically optimized for phosphoric acid, sulfuric acid, and nitric acid service in oxidizing environments. Hastelloy C-276 has lower chromium content and is better suited for reducing acids and mixed acid environments. G-30 is the preferred choice for fertilizer industry and wet process phosphoric acid applications; C‑276 is selected for severe reducing acid and chloride environments.

Q: What is the maximum operating temperature for Hastelloy G-30?

A: Hastelloy G-30 alloy is suitable for service up to approximately 400°C (750°F). It maintains excellent corrosion resistance across a wide temperature range in phosphoric, sulfuric, and nitric acid service. For applications above 400°C, other high‑temperature alloys such as Hastelloy X or Inconel 617 may be recommended.

Q: What are the key ASTM standards for Hastelloy G-30?

A: ASTM B582 covers plate, sheet, and strip; ASTM B622 covers seamless pipe and tube; ASTM B619 covers welded pipe; ASTM B626 covers welded tube; ASTM B581 covers bar; ASTM B564 covers forgings; ASTM B366 covers fittings. ASME equivalents include SB582, SB622, SB619, and SB581.

Q: What industries commonly use Hastelloy G-30?

A: Fertilizer industry (phosphoric acid production, P₂O₅ evaporators, superphosphoric acid concentrators), chemical processing (sulfuric acid coolers, nitric acid systems, mixed acid handling), pickling operations (stainless steel pickling, nitric‑hydrofluoric acid service), nuclear fuel reprocessing, petrochemical production, flue gas desulfurization, pesticide manufacturing, and heat exchanger fabrication.

We are a trusted Hastelloy G-30 Supplier and Hastelloy G-30 Manufacturer, China‑based, serving fertilizer producers, chemical processors, pickling equipment builders, and heat exchanger fabricators worldwide. All products comply with ASTM B582 / ASTM B622 / ASME SB582 with EN 10204 3.1 mill certificates, PMI verification, and dimensional inspection reports. We offer Hastelloy G-30 plate, sheet, seamless pipe, tube, bar, round bar, rod, wire, forgings, flanges, pipe fittings, and fasteners in custom sizes, with cut‑to‑size, precision machining, CNC machining, and solution annealing services. Contact us at info@monokj.com for size chart, pricing, or custom requirements.