Alloy 31 Plate Applications Overview

Key Advantages of Alloy 31

Alloy 31 is an iron-nickel-chromium-molybdenum alloy with nitrogen alloying addition. It has a face-centred cubic lattice. The 0.2% nitrogen content stabilizes the austenite and reduces the precipitation rate of intermetallic sigma phases. Technically qualified as a stainless steel, in reality, it covers the gap between high alloyed stainless steel and nickel alloys, performing some tasks as well as the latter while lowering the costs. Alloy 31 is included in the list of the German Federal Institute for Materials Research and Testing for transport and storage containers for hazardous goods. Alloy 31 has outstanding corrosion resistance in alkaline and acidic halide containing media, excellent resistance to sulfuric acid and phosphoric acid, chlorine dioxide bleaching plants in paper production.

Alloy 31 is characterized by outstanding resistance to corrosion in halide media, both acidic and basic; outstanding resistance to sulfuric acid, even highly concentrated; outstanding resistance to corrosion and erosion-corrosion in phosphoric acid media; excellent resistance to both localized corrosion and general corrosion in chlorine dioxide bleach media; excellent resistance to both reducing and oxidizing media, and ease of fabrication and welding. Approval for pressure-vessel use involving wall temperatures from -196 to 550ºC (-320 to 1020ºF).

Alloy 31 Plate - Manufacturers, Suppliers, Factory from China

Alloy 31 is a popular material with the chemical composition of nickel, chromium, molybdenum, iron and nitrogen that offers excellent properties to sustain in harsh conditions. Our Alloy 31 Plate offers remarkable resistive features in any acidic and reducing environment. This sheet is extremely demanded of its premium quality, higher strength, high performance, reliability, and durability. We use modern machinery in the manufacturing process to ensure the accuracy and fine finish of the Alloy 31 sheet. While manufacturing these sheets, we use the best quality raw material to ensure higher durability and exceptional properties. Our manufacturing team uses innovative ideas to develop the Best Quality Alloy 31 plate.

Alloy 31 (Din 1.4562) in plate form has a smooth, flat surface with uniform thickness. They are available from 3 mm to 50 mm. And it comes with standard widths of 1000 mm or 1219 mm. But, Tuolian can offer custom sizes or thicknesses upon your request. In terms of the production process, the UNS N08031 plate can be formed by hot rolling or cold rolling processes. Plus, it can be further processed to achieve specific surface finishes or tolerances. At JN Alloy, we can provide customized solutions to meet your unique requirements.

Standard Specification For Alloy 31 Plate

Specifications : ASTM B625 / ASME SB625

Standard : ASTM, ASME and API

Thickness : 4.0mm–100mm

Size : 1000 mm x 2000 mm, 1220 mm x 2440 mm, 1500 mm x 3000 mm, 2000 mm x 2000 mm, 2000 mm x 4000 mm

Specialize : Shim Sheet, Plate, B. Q. Profile.

Form : Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Strip, Flats, Blank (Circle), Ring (Flange)

Finish : Hot rolled plate (HR), Cold rolled plate (CR), 2B, 2D, BA NO(8), SATIN (Met with Plastic Coated)

Hardness : Soft, Hard, Half Hard, Quarter Hard, Spring Hard etc.

Alloy 31 Steel Plate Chemical Composition

Alloy 31 plate application

Alloy 31 plate is a high-performance nickel-based alloy with excellent corrosion resistance, making it ideal for demanding industrial applications. Below are some specific applications:

1. Chemical Industry

Heat Exchangers and Condensers: Used in chemical plants processing sulfuric acid, phosphoric acid, and hydrochloric acid, where high temperatures and aggressive chemicals require superior corrosion resistance.

Storage Tanks and Pipelines: Suitable for storing and transporting highly corrosive chemicals, including chloride solutions and acid mixtures, ensuring long service life.

Reactors and Columns: Applied in high-temperature, high-pressure environments handling strong acids or alkalis, such as chlorine processing and acid gas treatment units.

2. Flue Gas Desulfurization (FGD) Systems

Scrubbers and Absorbers: Used in coal-fired power plants and industrial boilers to withstand acidic flue gases containing SO₂ and HCl, preventing corrosion and equipment degradation.

Pumps, Pipes, and Valves: Essential in FGD systems for transporting corrosive waste liquids, ensuring durability in aggressive environments.

3. Seawater Desalination & Marine Engineering

Evaporators and Condensers: In multi-stage flash (MSF) and reverse osmosis (RO) desalination plants, Alloy 31 plates are used in evaporator chambers, tube sheets, and heat exchangers due to their high resistance to saltwater corrosion.

Seawater Cooling Systems: Applied in offshore oil platforms and ship engine cooling systems, preventing damage from chloride-induced corrosion and biofouling.

4. Pulp and Paper Industry

Bleaching Equipment: Used in the bleaching process where pulp is exposed to chlorine-based chemicals and peroxides, requiring resistance to highly corrosive substances.

Black Liquor Recovery Equipment: Utilized in the recovery and storage of alkaline black liquor to prevent material degradation and leakage.

5. Pharmaceutical & Food Processing

Pharmaceutical Equipment: Alloy 31 plates are used in reaction vessels, mixers, and filtration systems where exposure to high-purity chemicals and corrosive media is common, ensuring contamination-free production.

Food Processing Equipment: Ideal for food containers, pipelines, and sterilization units exposed to brine, high-temperature steam, and acidic cleaning agents, ensuring compliance with hygiene and corrosion resistance standards.

6. Mining & Metallurgy

Acid Leaching Equipment: Used in hydrometallurgical processes for extracting copper, nickel, and cobalt, where high-concentration sulfuric and hydrochloric acids are present.

Tailings Pipelines and Storage Tanks: Suitable for transporting and storing acidic solutions in mining operations, ensuring long-term resistance to corrosive environments.