Nickel Alloy Steel Shee ASTM B625 Alloy 31 UNS N08031

Product Item: Alloy 31 Nickel Alloy Steel Sheet
Type: Nickel Alloy Sheet
Standard: ASTM B625
Material: Alloy 31 (UNS N08031)
Thickness: 0.8-36 mm
Width: 650-2000 mm
Length: 800-4500 mm
 

We are a Chinese factory specializing in Nickel Alloy Steel Sheets, manufactured to ASTM B625 standards.

Our sheets are made from Alloy 31 (UNS N08031) and are available in thicknesses ranging from 0.8 to 36 mm, widths from 650 to 2000 mm, and lengths from 800 to 4500 mm, providing excellent corrosion resistance and strength for demanding industrial applications.

Nickel Alloy Steel ASTM B625 Alloy 31 UNS N08031 Available Specifications and Product Categories

GNEE steel offers a comprehensive range of Alloy 31 products tailored to UNS N08031 specifications, with a focus on Alloy 31 sheet:

Nickel Alloy Steel Sheet ASTM B625 Alloy 31 UNS N08031 Specifications

Alloy 31 Sheet:

Thickness: 0.025mm to 4mm

Width: 500mm to 2000mm

Finish: Cold-rolled, solution-annealed

Applications: Flue gas desulfurization, chemical reactors

Alloy 31 Plate:

Thickness: 0.5mm to 50mm

Width: 1000mm to 2500mm

Length: 2000mm to 12000mm

Finish: Hot-rolled, solution-annealed, descaled

Applications: Heat exchangers, nitric acid service

Nicrofer 31 Pipe:

Types: Seamless, welded

Outer Diameter: 0.5" to 8" (12.7mm to 203.2mm)

Wall Thickness: Sch 5S to Sch 160

Length: Up to 12m

Applications: Chemical processing piping

Nicrofer 31 Round Bar:

Diameter: 6mm to 300mm

Length: Up to 6000mm

Finish: Hot-rolled, solution-annealed, centerless ground

Applications: Valves, pump shafts

Custom Components:

Types: Flanges, fittings, CNC-cut parts

Sizes: Per ASME B16.5 or custom tolerances (±0.05mm)

Applications: Chemical and pulp and paper systems

Nickel Alloy Steel ASTM B625 Alloy 31 UNS N08031 Product Categories

Flat Products: Alloy 31 sheet and plate for corrosion-resistant structures.

Tubular Products: Nicrofer 31 pipe for fluid transport in aggressive environments.

Bar Products: Nicrofer 31 round bar for machining into high-strength components.

Custom Fabrication: CNC-machined parts and welded fittings for tailored solutions.

Note: Custom sizes and finishes are available. Contact GNEEsteel for bespoke Alloy 31 sheet solutions.

Alloy 31 (Nicrofer 3127 hMo) is an advanced iron-nickel-chromium-molybdenum super-austenitic stainless steel with nitrogen additions. This high-performance alloy closes the gap between high-alloyed austenitic special stainless steels and nickel alloys, providing exceptional corrosion resistance in aggressive environments. Alloy 31 typically contains 30-32% nickel, 26-28% chromium, 6-7% molybdenum, and 0.15-0.25% nitrogen, creating a stable austenitic structure with outstanding performance characteristics.

Execution Standards for Alloy 31

Gangsteel's Alloy 31 products comply with international standards:

ASTM B625: For Alloy 31 plate, sheet, and strip.

ASTM B622: For seamless Nicrofer 31 pipe and tubing.

ASTM B581: For Nicrofer 31 round bar.

ASME SB-625/SB-622: For corrosion-resistant applications.

DIN 1.4562: European standard for UNS N08031.

Note: Products are supplied with mill test certificates and tested per DNV, BV, or SGS standards, ensuring compliance with Nicrofer 31 chemical composition and Alloy 31 material properties.

Alloy 31 Fabrication Information

Alloy 31 can be readily fabricated using conventional methods, with some specific considerations for optimal results:

Hot and Cold Forming

Hot forming should be performed in the temperature range of 1,200 to 1,050°C (2,192 to 1,922°F) with subsequent rapid cooling in water or air. For cold forming, the material should be in the annealed condition, with intermediate annealing necessary for major cold forming work. Any cold forming exceeding 15% requires final solution annealing.

Welding

Alloy 31 can be welded using conventional processes such as GTAW (TIG), GMAW (MIG/MAG), and plasma welding. Welding should be performed using the stringer bead technique with low heat input. The interpass temperature should not exceed 120°C (248°F). Suitable filler metals include those matching the Alloy 31 composition or nickel-based alloys with similar or higher alloying content.

Machining

The alloy should be machined in the heat-treated condition. Due to its increased work hardening rate compared to conventional austenitic stainless steels, machining should be performed with lower cutting speeds, adequate depth of cut to penetrate below the work-hardened layer, and sufficient cooling.

Descaling and Pickling

Oxides on Alloy 31 are more adherent than on standard stainless steels. Grinding with fine abrasive belts or discs is recommended before pickling. Oxide layers should be destroyed by abrasive blasting or fine grinding before pickling in nitric-hydrofluoric acid mixtures.

Composition of Nicrofer Alloy 31

The Nicrofer 31 chemical composition is optimized for corrosion resistance, as per ASTM B625:

Note: High molybdenum and nitrogen enhance Alloy 31 material's resistance to pitting and crevice corrosion, making Alloy 31 sheet ideal for nitric acid service compared to Alloy C276.

Material Properties of Alloy 31

Density: 8.1 g/cm³ (0.293 lb/in³), supporting lightweight Alloy 31 sheet designs.

Melting Point: 1350-1370°C (2462-2498°F), suitable for high-temperature applications.

Hardness: ~90 HRB (annealed), contributing to wear resistance.

Thermal Conductivity: 12.0 W/m·K at 20°C, ideal for Alloy 31 sheet in heat exchangers.

Corrosion Resistance: Exceptional resistance to nitric acid, mixed acids, and chlorides, surpassing Alloy 28 in mixed acid environments.

Non-Magnetic: UNS N08031 is non-magnetic, ideal for sensitive applications.

Mechanical Properties of Alloy 31 UNS N08031

The mechanical properties of Alloy 31 material ensure reliability for Alloy 31 sheet, Nicrofer 31 plate, and pipe, as per ASTM B625 (solution-annealed condition):

Note: Properties vary with heat treatment. For detailed mechanical properties of Alloy 31 sheet, contact gnee steel for a datasheet.

Alloy 31(UNS N08031) Equivalent Materials and Standards

Alloy 31(UNS N08031) is comparable to other corrosion-resistant alloys:

Note: Alloy 31 sheet excels in nitric acid and flue gas desulfurization, offering advantages over Alloy 825 in mixed acid resistance.

Contact GNEE STEEL

For inquiries about Alloy 31, Alloy 31 sheet, Nicrofer 31 plate, Nicrofer 31 pipe, Nicrofer 31 round bar, or to request a quote for Nicrofer 31 price or a mechanical properties datasheet, contact GNEE steel Group's sales team. TrustGNEE steel for high-quality Alloy 31 material tailored to your project's needs, backed by expertise and reliability as leading Alloy 31 suppliers!

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What is uns N08031 material?

NAS325N (UNS N08031) is a stainless steel with extremely superior corrosion resistance and can be used in many severe corrosion environments. In addition to local corrosion resistance approaching that of nickelbase corrosionresistant alloys, it also provides excellent acid resistance.

What is Alloy 31?

Alloy 31(UNS N08031), or Nicrofer 3127 hMo, is a high-alloy austenitic nickel-chromium-molybdenum alloy with nitrogen, developed for superior corrosion resistance in severe environments, including nitric acid, sulfuric acid, and chloride-rich conditions. With high molybdenum (6.0-7.0%) and nitrogen (0.15-0.25%), Alloy 31 material resists pitting, crevice corrosion, and stress corrosion cracking, making Alloy 31 sheet ideal for chemical reactors and flue gas desulfurization systems. It outperforms Alloy 28 in mixed acid environments due to higher chromium and nitrogen content.

How Does Alloy 31 Compare to Alloy 28?

Alloy 31(UNS N08031) offers superior resistance to nitric and mixed acids due to higher chromium (26.0-28.0%) and nitrogen, while Alloy 28 (UNS N08028) excels in phosphoric acid resistance due to higher copper. Alloy 31 sheet is preferred for flue gas desulfurization and nitric acid service.

Why Choose GNEE steel's Alloy 31 Sheet?

Superior Corrosion Resistance: Alloy 31 material excels in nitric, sulfuric, and chloride-rich environments, surpassing Alloy 625 in specific acid conditions.

High-Temperature Stability: Maintains integrity up to 1000°F (538°C), ideal for Alloy 31 sheet in chemical processing.

Excellent Weldability: Ensures corrosion resistance in welded Alloy 31 sheet and pipe with minimal risk of intergranular corrosion.

Competitive Pricing: Nicrofer 31 price ranges from US $45-70 per kg (FOB), offering value for high-performance applications.

Global Supply: Gangsteel delivers Alloy 31 sheet, Nicrofer 31 plate, and round bar worldwide with EN 10204 3.1/3.2 certification.