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Short Description:
Alloy 31 is an iron-nickel-chromium-molybdenum alloy with nitrogen addition. The alloy fills the gap between special alloyed austenitic stainless steels and nickel alloys. Alloy 31 has been proven especially in the chemical and petrochemical industry, in ore extractors, environmental and marine engineering as well as in oil and gas production.
Product Description
Alloy 31 is an iron-nickel-chromium-molybdenum alloy with nitrogen and copper additions which has hybridized properties of austenitic super stainless steels and regular nickel alloys. Alloy 31 has exceptional corrosion resistance to alkaline & halide-containing media, sulfuric acid, phosphoric acid, chlorine dioxide media, nitric acid as well as reducing & oxidizing medias. It is widely used in offshore & marine industries, chemical & petrochemical processing, pharmaceutical piping, oil and gas extraction, and ore digestion plants. Especially, Alloy 31 can be used for the fabrication of pressure vessels which may endure a wide temperature-range from cryogenic level to elevated temperatures(-196°C to 550 °C).
Alloy 31 Characteristic
Excellent resistance to corrosion and erosion in phosphoric acid media
Excellent resistance to general and localized corrosion in Chloridoxid bleaching plants in paper production
Certification to ISO 15156/MR 0175 to level VI for sour gas applications in the oil and gas industry
Excellent resistance in reducing and oxidizing media, as well as in boiling 67% nitric acid
Excellent corrosion resistance in alkaline and acid halide media
Approval for pressure vessels with operating temperatures from -196 to 550 ° C
Good processability and weldability
Excellent resistance to sulfuric acid in a highly concentrated form
Specifications：
ASTM B581, ASTM B649, ASME SB581, ASME SB649, ASTM B625, ASME SB625
Alloy 31 Chemical Composition (% by weight)
| Element | C | Si | Mn | P | S | Cr | Cu | Fe | Mo | N | Ni |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | - | - | - | - | - | 26 | 1 | Balance | 6 | 0.15 | 30 |
| Max | 0.015 | 0.3 | 2 | 0.02 | 0.01 | 28 | 1.4 | 7 | 0.25 | 32 |
Alloy 31 Typical Physical and Mechanical Properties (RT, Annealed)
| Density, g/cm³ | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HRB |
|---|---|---|---|---|---|
| 8.05 | 1330-1370 | ≥650 | ≥228 | ≥40 | / |
- Bars & Rods & Foring Ring /Flanges
- Sheet & Plate
- Strip & Coil
- Welding Wire &Spring wire
- Seamless Tube & Welded Pipe
»Round Bar & Square Bar & Hexagon Bar
● Diameter : φ8～φ300mm Length:10mm-6000mm
● Hot forging, Hot Rolling, Cold Drawing
● Bright Surface, Polished Surface, Black Surface
»Tube & Pipe:Seamless Tube& Welded Pipe
● Cold Drawing Seamless Pipe： φ1.0～φ220mm
● Hot Extrusion pipe: φ50～φ250mm
● Others : U Blend Tube and Elbow
»Hot Rolled Plate & Cold Rolled Sheet
● Cold Rolling Sheet Thickness: ≦2.0mm Width:≦1500m
● Hot rolling Plate Thickness: ≧4.0mm Width: ≦2500m
»Strip & Tape Ribbon
● Thickness: ≧ 0.01mm Width: 15mm-300mm
● Cold rolling BA Strip, Hard & Soft Condition
»Straight Length Wire & Spool Wire
● Welding Wire: φ 0.1mm～6.0mm Cut length Rod: φ1.0～φ8.0mm
● Package : 5-25kg/Spool or Box
Alloy 31 ApplicationsI
- Components for flue gas desulfurization (FGD) plants
- Plants for the production of phosphoric acid via the wet digestion process
- Pipes and heat exchangers for sulfuric acids contaminated with chlorides
- Pipes containing ocean water and brackish water, condensers and chillers
- Pickling plants for sulfuric acid as well as nitric-hydrofluoric acid
- Treatment of sulfuric acids from waste
- Evaporation and crystallization of salts
- Components for the cellulose and paper industry
- Digestion of ores, e.g. in HIPAL (high-pressure acid leach) plants for the digestion of laterite ores
- Mineral oil production and refineries
- Organic acids and ester synthesis Fine chemicals
- Strain-hardened transport and feed
- pipes as well as slicklines, wirelines and flowlines in the transport of oil and gas
Introducing our Alloy 625 Bar – a high-performance nickel-based superalloy designed to meet the most demanding requirements in corrosive and high-temperature environments. Crafted with precision and engineered for excellence, this Alloy 625 Bar is a versatile solution for a multitude of industrial applications.
Key Features:
Exceptional Corrosion Resistance: Our Alloy 625 Bar boasts outstanding resistance to corrosion in a variety of challenging environments, including acids and alkaline solutions. Its resistance to pitting and crevice corrosion ensures longevity and reliability in corrosive settings.
High Temperature Strength: Experience unparalleled strength even at elevated temperatures. This alloy maintains its structural integrity under high thermal stress, making it an ideal choice for applications in gas turbines, nuclear reactors, and other high-temperature environments.
Oxidation and Scaling Resistance: The Alloy 625 Bar is crafted to withstand oxidation and scaling at elevated temperatures, ensuring reliability and longevity in conditions where other materials may falter.
Versatility Across Industries: From chemical processing to aerospace, marine engineering, and beyond, this Alloy 625 Bar demonstrates its versatility across various industries, providing a robust and reliable solution for diverse applications.
High Tensile and Yield Strength: With high tensile and yield strength, our Alloy 625 Bar delivers the mechanical properties needed for structural stability and performance in demanding situations.
Fatigue Resistance: Count on this alloy to resist fatigue, making it an excellent choice for applications subjected to cyclic loading.
Ease of Weldability: The Alloy 625 Bar is designed for ease of welding, allowing for seamless integration into diverse fabrication processes using conventional welding techniques.
Creep Resistance: Benefit from good resistance to creep deformation, ensuring the Alloy 625 Bar remains steadfast in applications with prolonged exposure to high temperatures.
Quality Chemical Composition: Our Alloy 625 Bar is meticulously crafted with a precise blend of nickel, chromium, molybdenum, and niobium, among other elements, delivering a product with a unique and reliable combination of properties.
Elevate your projects with the reliability and performance of our Alloy 625 Bar – a testament to quality craftsmanship and unwavering durability. Choose excellence, choose Alloy 625 Bar for your critical applications.