UNS S31254 6Mo Stainless Steel (UNS S31254 / W.Nr. 1.4547) sheet and plate are supplied as high-alloy austenitic stainless steel for severe chloride-bearing and seawater environments. Thickness, dimensions, condition, testing and documentation are reviewed before quotation.
Final suitability depends on medium, temperature, stress, fabrication route, heat treatment and governing code.
UNS S31254 6Mo Stainless Steel Sheet and Plate Specification
| Alloy / UNS |
UNS S31254 6Mo Stainless Steel / S31254 |
| Werkstoff / EN |
1.4547 / X1CrNiMoCuN20-18-7 |
| Product standard |
ASTM A240 / ASME SA-240 |
| Forms |
Sheet, plate, strip and cut-to-size blanks subject to standard scope |
| Thickness |
Confirmed against mill capability, standard scope and inquiry |
| Condition |
Annealed, solution treated or heat treated as required by the governing specification |
| Surface |
Hot-rolled, cold-rolled, pickled, ground or polished as specified |
| Documentation |
Material test certificate and heat-number traceability as ordered |
Available Product Forms and Processing
| Form |
Processing |
Purchasing points |
| Hot-rolled plate |
Heat treated, descaled or pickled |
Thickness, flatness, surface and edge condition |
| Cold-rolled sheet |
Cold rolled and heat treated |
Gauge, width, surface and tolerance |
| Cut blanks |
Sheared, sawn, waterjet or machined |
Dimensions, edge condition, marking and traceability |
Equivalent Designations
| Commercial designation |
UNS |
Werkstoff |
EN designation |
| UNS S31254 6Mo Stainless Steel |
S31254 |
1.4547 |
X1CrNiMoCuN20-18-7 |
Chemical Composition
| C |
Cr |
Ni |
Mo |
Cu |
N |
Mn |
| 0.020 max |
19.5–20.5 |
17.5–18.5 |
6.0–6.5 |
0.5–1.0 |
0.18–0.22 |
1.0 max |
Weight percent; final acceptance follows the ordered standard and material test certificate.
Mechanical and Physical Properties
| Property |
Requirement |
Purchasing note |
| Tensile strength |
Confirm to ASTM A240 by thickness and condition |
Report on MTC |
| Yield strength |
Confirm to governing specification |
Condition dependent |
| Elongation |
Confirm to governing specification |
Test direction and gauge length apply |
| Physical properties |
Typical values available for design review |
Not a substitute for code data |
Heat Treatment, Cutting and Fabrication
| Heat treatment |
Follow the governing specification and required final properties. |
| Cutting |
Shearing, sawing, waterjet, plasma or machining selected according to thickness and edge requirements. |
| Forming |
Allow for work hardening, bend radius and intermediate heat treatment where required. |
| Welding |
Use qualified procedures and compatible filler material selected for the service condition. |
Inspection and Quality Documentation
| Identity |
Heat number and PMI when ordered |
| Tests |
Chemical and mechanical results on the MTC |
| Dimensions |
Thickness, width, length, flatness and surface inspection |
| NDT |
Ultrasonic or penetrant inspection subject to order requirements |
UNS S31254 6Mo Stainless Steel Sheet and Plate Applications
| Industry |
Components |
Selection focus |
| Seawater systems |
Plate fabrications, tanks and heat-exchanger components |
Resistance to chloride pitting and crevice corrosion |
| FGD equipment |
Scrubber liners and ducts |
Resistance in acidic chloride media |
| Pulp and paper |
Bleaching and process equipment |
Corrosion resistance in aggressive service |
UNS S31254 6Mo Stainless Steel Sheet and Plate Packaging
Sheets and plates are protected according to surface, dimensions, package weight, route and customer specification.
| Form |
Protection |
Confirmation |
| Plate |
Pallet, skid or reinforced wooden case |
Weight, lifting and edge protection |
| Sheet |
Interleaving, protective film and waterproof wrapping |
Surface and moisture protection |
| Cut blanks |
Blocked wooden case |
Count and heat traceability |
Procurement Confirmation
State UNS S31254 6Mo Stainless Steel / UNS S31254, standard edition, thickness, width, length, quantity, condition, surface, tolerance, testing, marking, packing and certificate requirements.
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