Introduction

ASTM B443 Inconel 625 Alloy Plate covers nickel-chromium-molybdenum-niobium alloy plate, sheet, and strip for corrosive and high-temperature service. This specification includes UNS N06625 (Alloy 625 / Inconel 625) in two conditions: Grade I (Annealed) and Grade II (Solution Annealed). Available in hot-rolled and cold-rolled forms, custom thickness, and cut-to-size options.

Inconel 625 alloy plate (UNS N06625) is a nickel chromium molybdenum alloy plate with niobium addition. The molybdenum and niobium work together to stiffen the alloy matrix, providing high strength without the need for a strengthening heat treatment. This high temperature nickel alloy plate delivers excellent oxidation resistance up to 1800°F (980°C), outstanding pitting and crevice corrosion resistance, and immunity to chloride stress corrosion cracking. It is non-magnetic and retains toughness from cryogenic to elevated temperatures.

Specifications & Process Options

Applications

1. Aerospace & Gas Turbine Components

• For turbine shroud rings, thrust reversers, and jet engine exhaust ducting where temperatures reach 1800°F, Inconel 625 alloy plate for aerospace applications provides the high temperature resistant Inconel plate needed for critical flight components. The alloy’s resistance to oxidation and thermal fatigue ensures reliable performance under cyclic heating and cooling.

• In land-based turbine components and aircraft exhaust systems, ASTM B443 UNS N06625 plate delivers the creep resistant Inconel 625 plate strength required for sustained high-temperature operation.

2. Oil & Gas / Offshore Equipment

• For oil well equipment, refineries, and natural gas processing where H₂S and sour gases are present, Inconel 625 plate for oil and gas industry offers exceptional resistance to sulfide stress cracking and pitting. The alloy is NACE MR0175 / ISO 15156 compliant for sour service applications.

• For offshore platforms and seawater-exposed structures, ASTM B443 nickel alloy plate withstands high mechanical stresses and chloride-rich marine environments. Its seawater corrosion resistance makes it the standard choice for risers and subsea components.

3. Chemical Processing & Pressure Vessels

• For reactors, vessels, and heat exchangers handling mineral acids (nitric, phosphoric, sulfuric, hydrochloric), ASTM B443 Inconel 625 sheet resists a wide range of severely corrosive media with exceptional resistance to pitting and crevice corrosion.

• For ASME-coded pressure vessels in aggressive chemical service, Inconel 625 plate for pressure vessel combines high strength, fabricability, and outstanding corrosion resistance without requiring post-weld heat treatment.

4. Marine Engineering & Nuclear Industry

• For seawater cooling systems and offshore components, Inconel 625 plate for marine engineering resists salt water, air, alkaline chemicals, and neutral salts. The alloy is widely used in seawater desalination equipment and ship components.

• For nuclear reactors and pollution control equipment, Inconel 625 plate for nuclear industry provides excellent resistance to high-temperature water corrosion and radiation stability.

5. Heat Exchangers & Industrial Equipment

• For heat exchangers, condensers, and flue gas scrubbers, Inconel 625 plate for heat exchanger offers high strength and corrosion resistance across a wide temperature range.

• For spray bars, chimney liners, and bubble caps, ASTM B443 nickel alloy 625 plate provides the durability needed for aggressive industrial environments.

FAQ – ASTM B443 Inconel 625 Alloy Plate

Q: What is the difference between Grade I (Annealed) and Grade II (Solution Annealed) in ASTM B443?

A: Grade I (Annealed) is the default condition for Inconel 625 plate if not specified. Grade II (Solution Annealed) involves a higher-temperature solution treatment that provides improved mechanical properties for elevated-temperature service. Both conditions are available for all product forms.

Q: Can Inconel 625 alloy plate be welded without post-weld heat treatment?

A: Yes. Inconel 625 alloy plate can be welded using TIG, MIG, and other processes with matching ERNiCrMo-3 filler metal. The alloy’s niobium and molybdenum matrix provides high strength in the as-welded condition without requiring post-weld heat treatment.

Q: What makes Inconel 625 different from stainless steel?

A: Inconel 625 alloy plate is a nickel chromium molybdenum alloy with niobium addition, making it a nickel-based superalloy rather than a stainless steel. It offers superior high-temperature strength (up to 1800°F), better pitting and crevice corrosion resistance, and immunity to chloride stress corrosion cracking that standard stainless steels cannot provide.

Q: What industries use ASTM B443 Inconel 625 plate?

A: Aerospace (turbine components, engine parts, exhaust systems), oil and gas (wellhead equipment, sour gas processing), marine engineering (offshore platforms, seawater systems), chemical processing (reactors, vessels, heat exchangers), nuclear reactors, and pollution control equipment.

We are a trusted ASTM B443 Inconel 625 Alloy Plate Manufacturer and Inconel 625 Plate Supplier, China-based, serving aerospace, oil and gas, chemical processing, and marine industries worldwide. All products comply with ASTM B443 / ASME SB443 with EN 10204 3.1 mill certificates, PMI verification, and dimensional inspection reports. We offer hot-rolled and cold-rolled Inconel 625 plate in custom thickness from 0.5mm to 150mm, with cut-to-size and precision machining services. Contact us at info@monokj.com for size chart, pricing, or custom requirements.