Super Duplex 2507 Fasteners belong to the super duplex grade of steels. They have the qualities of ferritic and austenitic steel grades. There are three different types of duplex steels as standard duplex, super duplex and lean duplex. The super duplex is used most next to the standard duplex. The Super Duplex 2507 Bolts are costlier than the standard duplex and other grades of steel types because of their composition. The material has 25% chromium, 4% molybdenum and 7% nickel in the content.
The Super Duplex Stainless Steel Bolts and Nuts have very high corrosion resistance, especially the chloride ion corrosion cracking resistance. They are also resistant to pitting and crevice attack. Due to these qualities, the Super Duplex 2507 Hex Bolts are suitable for marine, sea water, brackish water applications such as water desalination plants. Other applications include flue gas scrubbing equipment, pulp and paper industrial applications, offshore oil drilling and production.
Specifications of Duplex Fastners
Specifications | ASTM / ASME F53, A479 / SA479 |
Standard | ASTM / ASME F53, A479 / SA479 |
Length | 3 mm to 200 mm |
Nuts Size | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
ASTM A182 F53 UNS S32750 Bolts / Screw Size | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
Standard | DIN, UNI, ISO, JIS, GB, IS, BS, ASME, ANSI, ASTM and all International Standards |
Bolts, Studs Threads | METRIC, BSW, BSF, UNC, UNF or as required |
In Form of | Hex, Square, Round, Threading as per Gauge Etc. |
Head drive | Phillips, Slotted, Phillips/Slot, Six-Lobe, etc |
Bolts Size | M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M14, M16, M20, M24, M30, M36 to M160 |
Machine Screws Size | M1.6 – M12 |
Washers Size | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
Test Certificate | Manufacturer Test Certificate as per EN 10204 / 3.1 |
Source of raw materials | Tata Steel, JSPL, RINL, Usha Martin, Dhamm Steel, Mukund Steel etc. |
Scope Of Manufacture | Hot Forged , Nut / Bolt; up to M36 / 1-1/2” Dia, up to 1100mm lg |
Super Duplex Steel Grades | Super Duplex Steel UNS S32750 |
Packing | IN BULK: canton, pallet, Small Boxs / carton / pallet, or customer request |
Production process | M2-M24: Cold Froging, hot forging M24-M100, machining and CNC for Customized connecting element |
Super Duplex 2507 Fasteners Standard | ANSI – American National Standards Institute ANSI B 18.2.4 2M UTS – Unified Thread Standard : UNC, UNF, UNEF, UNS, NPT, NPTF ISO – International Organization for Standardization : ISO 4032, ISO 4033, JIS standards |
Alloy 2507 Fasteners Type | Hex Coupling Nut, Hex Nut, Square Nut, Hex Domed Cap Nuts, Hex Head Bolts, Stud Bolts, Socket Hexagon Head Screw, Pan Head Screw, Socket Head Cap Screw, Wing Screw, T-Head Bolts, Foundation Bolts,Screw, Studs, Socket Screw, Hex Set Screw, Cap Screw, Machine Screw, Wing Screw, Spring Washers, Washers, Studs, Marine Anchors, Anchors, Hexagon Nut,U- Bolts, Anchor Bolt, Mushroom Head Square Neck Bolts, J Bolts,Eye Bolt,Structural Bolts, Bolts, Nuts, Sockets, Screws, Allen Cap screw,Nut |
Chemical Composition of Duplex Fastners
Grade | c | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 – 23.0 | 3.0 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
S32205 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 21.0 – 23.0 | 2.50 - 3.50 | 4.50 – 6.50 | 0.8 – 0.20 | 63.54 min |
Chemical Compatibility Of SAF 2507 Fasteners
Element | Content (%) |
Chromium, Cr | 24 – 26 |
Nickel, Ni | 6 – 8 |
Molybdenum, Mo | 3 – 5 |
Manganese, Mn | 1.20 max |
Silicon, Si | 0.80 max |
Copper, Cu | 0.50 max |
Nitrogen, N | 0.24 – 0.32 |
Phosphorous, P | 0.035 max |
Carbon, C | 0.030 max |
Sulfur, S | 0.020 max |
Iron, Fe | Balance |