Hastelloy G-30/UNS N06030/W. Nr. 2.4603/Alloy G-30 bar

Hastelloy G-30 bar, designated as UNS N06030, W.Nr. 2.4603, and commonly called Alloy G-30, is a nickel-chromium-iron-molybdenum-copper superalloy specifically engineered for superior resistance to a wide range of highly corrosive chemicals, particularly strong oxidizing acids and complex mixed acid environments containing halides. This bar stock form is a critical material for machining components such as pump shafts, valve stems, agitators, and fasteners used in aggressive chemical processing, pollution control, and phosphoric acid production.

Introduction to Hastelloy G-30 (Alloy G-30)

Hastelloy G-30 is an austenitic nickel-based alloy that builds upon the success of earlier G-type alloys (like G-3) with an optimized composition featuring higher chromium and a careful balance of molybdenum and tungsten. This chemistry provides exceptional resistance to sulfuric, nitric, phosphoric, and hydrochloric acids, as well as their mixtures, even in the presence of oxidizing contaminants and halide ions that cause pitting and stress corrosion cracking in lesser materials. The bar stock is ideal for parts requiring high strength and integrity in the most challenging wet process environments.

Chemical Composition of Hastelloy G-30 Bar

The corrosion resistance of Hastelloy G-30 bar stems from its meticulously balanced, multi-component composition. Supplied by Shanghai NC Metal Materials Co., Ltd., the bar stock meets exacting standards to ensure reliable performance in critical chemical service.

Mechanical Properties of Hastelloy G-30 Bar

Hastelloy G-30 bar offers a robust combination of strength and ductility, suitable for demanding mechanical applications in corrosive settings. It is typically supplied in the solution-annealed condition to maximize corrosion resistance.

Physical Properties of Hastelloy G-30 Bar

The physical properties of Alloy G-30 bar are important for equipment design involving thermal exchange and structural calculations.

Notes / Condition

Standard Specifications, Bar Forms, and Available Sizes

Shanghai NC Metal Materials Co., Ltd. supplies Hastelloy G-30 bar in various forms to meet the fabrication needs of the chemical process industry.

Primary Applications of Hastelloy G-30 Bar Stock

Machined components from Hastelloy G-30 bar are essential in severe corrosive service: Chemical Processing: Reactor internals, agitator shafts, pump shafts, and valve components handling sulfuric, nitric, phosphoric, and hydrochloric acids, especially mixed acids. Phosphoric Acid Production: Critical for components exposed to wet-process phosphoric acid containing fluorides and chlorides. Pollution Control & Scrubbers: Fan shafts, duct supports, and fasteners in flue gas desulfurization (FGD) systems. Metal Pickling & Electroplating: Equipment for pickling with sulfuric/nitric/hydrofluoric acid mixtures. Nuclear Fuel Reprocessing: Selected components due to resistance to nitric acid and radioactive contaminants.

Corrosion Resistance Overview

Hastelloy G-30 offers outstanding performance in a broad spectrum of corrosive environments. It exhibits superior resistance to commercial phosphoric acids, including those containing fluorides and chlorides. It handles sulfuric acid concentrations across a wide range, particularly excelling in the presence of oxidizing salts. Its high chromium content makes it highly resistant to nitric acid and oxidizing conditions. The alloy also shows excellent resistance to pitting and crevice corrosion in chloride-containing solutions, as evidenced by high Critical Pitting Temperature (CPT) and Critical Crevice Temperature (CCT) values.

Machining and Fabrication of Hastelloy G-30 Bar

Hastelloy G-30 bar is machinable using techniques for austenitic, work-hardening nickel alloys. Recommendations include: using rigid machine tools with adequate power; sharp carbide tools with positive rake angles; moderate cutting speeds; firm, consistent feed rates to minimize work hardening; and high-pressure coolant for heat dissipation and chip control. Its work-hardening rate is significant, so tool paths should be planned to avoid re-cutting work-hardened surfaces.

Welding of Hastelloy G-30 Bar

Alloy G-30 is readily weldable by common processes such as Gas Tungsten Arc Welding (GTAW/TIG), Shielded Metal Arc Welding (SMAW/Stick), and Gas Metal Arc Welding (GMAW/MIG). Matching filler metals (e.g., ERNiCrMo-11) are recommended. Due to its low carbon content and stabilized composition, it is highly resistant to sensitization and subsequent intergranular attack in the weld heat-affected zone (HAZ). Post-weld heat treatment is not typically required for corrosion resistance but may be used for stress relief in thick sections.

Reference Pricing and Key Purchasing Factors

The price of Hastelloy G-30 bar from Shanghai NC Metal Materials Co., Ltd. is influenced by its high nickel and chromium content, as well as the costs associated with molybdenum, tungsten, and stringent quality controls for chemical service.