Nickle Alloy Flat Welding Flange 254 SMO 6MO UNS S31254 Super Dupex F44 1.4547
Nickle Alloy Flat Welding Flange 254 SMO 6MO Super Dupex F44 1.4547 UNS S31254
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 S31254 / 1.4547 / F44:
- UNS S31254 in various ASTM product form specifications
- EN 10088-3 1.4547 (Grade X1CrNiMoN20-18-7)
- NORSOK MDS R11 to R15, R17 & R18
- ASTM A182 F44
- NACE MR01-75 (latest revision) / ISO 15156
Chemical Composition:
| Element | C | Mn | Si | S | P | Cr | Ni | Mo | N | Cu |
| Minimum(%) | - | - | - | - | - | 19.5 | 17.5 | 6 | 0.18 | 0.5 |
| Max(%) | 0.02 | 1 | 0.7 | 0.01 | 0.03 | 20.5 | 18.5 | 7 | 0.25 | 1 |
Specifications:
| ASTM | S31254 / A182 / A276 / A479 / A240 / A312 / A312 |
| ASME | S31254 / SA182 / SA276 / SA479 / SA240 / SA312 / SA312 |
Fabrication And Heat Treatment:
| Machinability |
1. Stainless steel grade 254 SMO™ is quite tough to machine due to the extremely high work hardening rate and lack of sulfur content; 2. however using sharp tools, overpowered machine tools, positive feeds, good amount of lubrication, and slow speeds tend to provide good machining results. |
| Welding |
1. Welding of stainless steel grade 254 SMO™ requires filler material without which it results in poor strength properties. 2. Filler metals such as AWS A5.14 ERNiCrMo-3, and alloy 625 are recommended. 3. Electrodes used in the process, have to match with AWS A5.11 ENiCrMo-12. |
| Annealing |
Annealing of this material should be performed at 1149-1204°C (2100-2200°F), which should be followed by a water quench. |
| Hot Working |
1. Forging, upsetting and other operations relating to this material can be performed at 982 – 1149°C (1800 – 2100°F). 2. It is recommended that temperatures do not exceed this range as it would result in scaling and reduction in the workability of the material. 3. To re-attain maximum corrosion resistant properties, it is advisable to perform post-process annealing. |
| Cold Working |
1. Cold working can be carried out using all the traditional methods; 2. however the process would be tough due to its high work hardening rate. 3. The result will provide the material with increased strength and toughness. |
| Hardening | 1. Stainless steel grade 254 SMO™ does not respond to heat treatment. 2. Hardening is possible only through cold reduction. |
Processing Flow Chart:
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