Nickle Alloy Flat Welding Flange UNS S32760 Super Duplex F55 1.4501
Nickle Alloy Flange, also known as a flange rim or flange, is a part that connects pipes to each other at the ends, and it is also used on equipment inlets and outlets for connecting two pieces of equipment, such as a reducer flange. A flange connection or flange joint refers to a detachable connection consisting of a flange, gasket, and bolt, which together form a combined sealing structure.
Welding Process:
- Required Equipment: A set of manual arc welding equipment, one handle-type angle grinder, one electric air hammer, and one straight edge.
- Folding Welding Preparation: 1. Check and adjust the equipment to ensure normal operation; 2. Prepare φ4.0 J402 welding rods, which are preferably dried at 300°C - 350°C for one hour.
- Folding Welding Process: 1. Assemble the cone and the large flange according to the drawing requirements, then divide the large flange into 8 equal parts; 2. Welding due to the thicker flange and larger groove, the use of segmental symmetrical, multi-layer welding is adopted.
- Folding Welding Quality Requirements: The weld strength must at least match the strength of the base material. The weld surface should be flat and smooth, without defects such as burn-through, porosity, welding leaks, slag inclusion, undercutting, or incomplete welding. The weld reinforcement height should be less than 2mm.
- Folding Notes for Attention: 1. When welding the base layer, always use J506 welding rod manual surfacing and welding with a small current. Strictly follow the welding process; 2: After welding each position, use a level to check the deformation of the flange plane; 3: While welding, use the air hammer to strike the weld to eliminate stress.
UNS S32760 / 1.4501 / F55:
Material to UNS S32760 (and the other specifications listed below) is described as a super duplex stainless steel with a microstructure of 50:50 austenite and ferrite. The steel combines high mechanical strength (typically up to 600 MPa yield strength) and good ductility with outstanding corrosion resistance to marine environments and a wide, diverse range of oil & gas production environments. The alloy is supplied with a PREN (Pitting Resistance Equivalent) at >= 40.0 which guarantees high
resistance to pitting corrosion. In addition, the steel offers high resistance to crevice corrosion and stress corrosion cracking. Ambient and sub-zero (down to minus 50 °C) notch ductility is good. These attributes mean that this super duplex steel can be used successfully as an alternative to 300 series stainless steel (such as type 316), standard 22% Cr duplex steel and precipitation hardening stainless steels. Where appropriate the alloy can be considered in lieu of more costly Grade 5 titanium or
nickel based alloys.
Availability:
Bar, forgings, sheet, plate, pipe, tube, closed die forgings, flanges and welding consumables.
Related material specifications:
- UNS S32760 in various ASTM product form specifications
- EN 10088-3 1.4501 (Grade X2CrNiMoCuWN25-7-4)
- NORSOK MDS D51 to D55, D57 & D58
- ASTM A182 F55
- NACE MR01-75 (latest revision) / ISO 15156
Machinability / Welding:
The machining and welding of this grade of super austenitic stainless steel presents no particular problems. Guidance notes are available upon request.
Typical Applications:
Pumps, valves, chokes, Xmas trees, pipework / flanges, bolting, connectors & manifolds. In oil and gas industry,equipment in defence, chemical and marine industries.
Chemical Composition:
| Element | C | Mn | Si | S | P | Cr | Ni | Mo | Cu | N |
| Minimum(%) | - | - | - | - | - | 24 | 6 | 3 | 0.5 | 0.20 |
| Max(%) | 0.03 | 1 | 1 | 0.015 | 0.035 | 26 | 8 | 4 | 1 | 0.30 |
Reference Standards:
| General | - Norsok M-650 Ed.4 qualified manufacturers
- PED 2014/68/EU Annex I section 4.3
- AD2000 W0 (W2/W10)
- NACE MR0175/ ISO 15156-3 and NACE MR0103/ISO 17945
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| Plate, sheet and coil | -
ASTM A240, EN 10028-7, EN 10088-2, EN 10088-4, Norsok M-630 MDS D55 |
| Bar and forging | -
ASTM A276, ASTM A479, ASTM A182, EN 10088-3, Norsok M-630 MDS D54/D57 |
| Other products | |
Applications:
| | - Process industry components in nitric acid, dioxide, polypropylene & PVC production, caustic evaporators
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| | - Equipment handling organic & fatty acids
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| | - Marine industry and shipbuilding propellers, shafts, rudders, shaft seals, pumps, bolts, fasteners, valves, instrumentation
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| | - Oil & Gas industry pumps, valves, pipe, vessels, wellhead equipment, subsea equipment
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| | - Pollution control systems, fans and pumps, wet scrubbers, incinerators, flue gas desulphurisation (FGD)
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| | - Pulp & paper industry components such as black liquor heater tubes, digester blow valves, rotary feed valves, I.D.fans, brownstock washers, precipitators, bleaching components
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| | - Food Industry applications including sugar cane centrifuges, corn and vegetable processing plant
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| | - Agrochemicals production such as fertilisers (based on wet phosphoric acid)
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| | - Sewage treatment, seawater cooling, desalination plants
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Processing Flow Chart:
