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2507 Description

Duplex stainless steels possess high mechanical properties and excellent corrosion resistance, and have been widely applied in various industries such as marine and offshore oil & gas, petrochemicals, pulp and paper, seawater systems, pharmaceuticals, food processing, and chemical fertilizer industries. Common grades include ultra-low carbon duplex stainless steels such as 18Cr-5Ni-3Mo, 22Cr-5Ni-3Mo, and 25Cr-7Ni-4Mo, commonly referred to as 1805, 2205, and 2507, respectively. 1805 is typically used in applications with lower stress and corrosive environments; 2205, due to its high strength, excellent intergranular corrosion resistance, and uniform corrosion resistance, can replace 304L and 316L stainless steels [1]; 2507, in addition to the advantages of 2205, exhibits superior resistance to chloride pitting and crevice corrosion compared to 316L, and has already been used abroad for manufacturing key equipment in urea synthesis processes. This paper will analyze and explore the characteristics of 2507 duplex stainless steel from aspects such as material properties, formability, weldability, and heat treatment performance. Based on the inherent properties of 2507 duplex stainless steel, some requirements for its application in equipment manufacturing and engineering projects will be proposed.
2507 Duplex is highly resistant to uniform corrosion by organic acids such as formic and acetic acid. It is alsohighly resistant to inorganic acids, especially if they contain chlorides. Alloy 2507 is highly resistant to carbide-related intergranular corrosion. Due to the ferritic portion of the duplex structure of the alloy it is very resistant to stress corrosion cracking in warm chloride containing environments. Through additions of chromium, molybdenum and nitrogen localized corrosion such as pitting and crevice attack are improved. Alloy 2507 has excellent localized pitting resistance.

Chemical Composition %

% C Cr Ni Mo Cu P Mn Si S N
min 24 6.0 3 0.24
max 26 8 5 0.035 1.2 0.8 0.02 0.32

Mechanical & Physical Properties

0.2% Yield Strength Tensile Strength Elongation Modulus of Elasticity Density Melting Range
MPa MPa % GPa g/cm³ °C
550 800 15 200 7.98
  • COMMON TRADE NAMES
  • SAF2507
  • 1.4410
  • F53
  • OUTOKUMPU2507
  • 022Cr25Ni7Mo4N
  • Z3 CN 25.06 Az
  • X2CrNiMoN25-7-4
  • Swedish SS2328

Specification

  • Plate: ASTM A240
  • Bar:ASTM A276
  • Pipe:ASTM A790
  • Fitting:ASME B16.9
  • Forging:ASTM A182

Typical Applications

  • Desalination Equipment
  • Chemical process pressure vessels, piping and heat exchangers
  • Marine Applications
  • Flue Gas Scrubbing Equipment
  • Pulp & Paper Mill Equipment
  • Offshore Oil production/technology
  • Oil and gas industry equipment

Welding consumables

  • ER2594 1/16 in (1.6 mm)
  • E/ER2594 3/32 in (2.4 mm)
  • E/ER2594 1/8 in (3.2 mm)

What Can We Offering

Available Product Range (in mm)

  • Hot-Rolled Steel Plates
  • Thickness: Ranging from 3- 130mm
  • Width: 400-3260mm,Standard Width: 1000, 1219, 1500, and 2000mm
  • Length:1000mm-25000mm
  • Cut to Length: 2000 2440, 3000, 3048 and 6000mm
  • Surface Finish:  NO.1, NO.4, 2B,1D,2D,BA,6K,8K, HL,Embossed
  • Cold-Rolled Steel Sheet/Plate
  • Thickness: Ranging from 0.2mm to 4mm
  • Width: 600mm-2000mm
  • Standard Width: 1000, 1219, 1500, and 2000mm
  • Length:1000mm-6000mm
  • Cut to Length: 2000 2440, 3000, 3048 and 6000mm
  • Form: Sheet Or Coil

Available Round Bar Dimensions (in mm)

  • Diameter
  • General Range: 3mm to 800mm
  • Common Range: 25mm to 152mm
  • Specialized: Up to 300mm or more for certain applications
  • Length
  • Standard: 1 to 6 meters
  • Custom: Available in custom cut lengths
  • Other dimensions
  • Forms: Available in various forms including round, square, hex, flat, billet, and ingot
  • Finishes: Common finishes include bright, polished, and black
  • Tolerance:±0.05 mm (cold-drawn), ±0.4 mm (hot-rolled)

Type Of Flangs (Size/Dimensions)

  • Welding Neck, Reducer Flange,Socket Weld Flange
  • Dimensions:½” – 48″（DN15-DN1200）
  • Pressure Class:150# 300# 600#900#1500#
  • Facing Type:RF,FF,RTJ
  • Slip-On Flange,Lap Joint Flange,Threaded Flange
  • Dimensions:½” NB – 24″ NB（DN15 – DN600）
  • Pressure Class: Class 150 to 2500
  • Face: Raised face (RF), Ring type joint (RTJ)
  • Blind Flange
  • Dimensions:½” – 60″（DN15-DN1500）
  • Pressure Class:150# 300# 600#900#1500#

Types of Steel Pipes & Tubes

  •  Seamless Pipe
  • OD Φ6 – Φ630 mm, WT 0.5 – 80 mm
  • Welded Pipe
  • OD Φ15 – Φ3000 mm (up to 3m for spiral)
  • Precision Tube
  • OD Φ4 – Φ100 mm, WT tolerance ±0.05mm
  • Capillary Tube
  • OD 0.5 – 6 mm, WT down to 0.1mm
  • Coiled Tube
  • Up to 100–1000m long, for OD < Φ25mm

Types of Fittings

  • Elbow:Butt-Weld┃Socket Weld ┃Threaded
  • 90°, 45°, and 180°. Available in Long Radius (LR) and Short Radius (SR) types.
  • Nominal Diameter (DN): DN6 – DN1200 (NPS ¼” – 48″)
  • Schedule : SCH 5, 10, 20, 30, 40, 80, 160, XXS
  • Custom angles (e.g., 30°, 60°), U-bend heat exchanger tubes
  • Tee:Equal┃Reducing┃Butt-Weld┃Socket Weld┃Threaded
  • Nominal Diameter (DN): DN6 – DN1200 (NPS ¼” – 48″)
  • Schedule : SCH 5, 10, 20, 30, 40, 80, 160, XXS<
  • Cap:Butt-Weld┃Threaded┃Socket Weld
  • Nominal Diameter (DN): DN6 – DN1200 (NPS ¼” – 48″)
  • Schedule : SCH 5, 10, 20, 30, 40, 80, 160, XXS
  • Custom non-standard sizes, small batch orders
  • Weldolet,Sockolet,Threadolet,Latrolet,Nipolet,Lapolet
  • Run Pipe: DN25 – DN1200 (NPS 1″ – 48″)
  • Outlet Branch: DN6 – DN200 (NPS ¼” – 8″)
  • Schedule: SCH 40, 80, 160, XXS (matched to run pipe)

Overall Supply Range of Metal Strip & Foil

Strip & Foil
  • Thickness(Thin Strip):0.02 mm – 0.5 mm
  • Thickness(Foil):≤ 0.02 mm（20 μm）
  • Narrow width: 5–50 mm (for electronic leads)
  • Wide width: 50–600 mm (for general coil applications)
  • Coil Length:Continuous rolls, each roll 10–3000 meters
  • Roll weight: 1–500 kg (depending on material density)
  • Finishes:Bright,Matte,Embossed,Coated

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