Available Materials
Featured Products
NEWS
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