UNS S31254 6Mo Stainless Steel (UNS S31254 / W.Nr. 1.4547) round bar and rod are supplied as high-alloy austenitic stainless steel with elevated molybdenum and nitrogen for severe chloride-bearing environments. Dimensions, condition, testing and documentation are reviewed before quotation.
Final suitability depends on the medium, concentration, temperature, stress, fabrication route and governing design code.
UNS S31254 6Mo Stainless Steel Round Bar Specification
| Alloy / UNS |
UNS S31254 6Mo Stainless Steel / S31254 |
| Werkstoff / EN |
1.4547 / X1CrNiMoCuN20-18-7 |
| Product standard |
ASTM A276 / ASME SA-276 |
| Forms |
Round bar, rod, bright bar, peeled bar, ground bar and cut pieces |
| Diameter |
Common supply range 6–200 mm; other sizes subject to mill capability |
| Condition |
Hot finished, cold finished, annealed or solution treated, peeled, ground or polished as specified |
| Documentation |
Material test certificate and heat-number traceability as ordered |
Available Bar Forms and Processing
| Form |
Processing |
Order information |
| Hot-finished bar |
Hot worked, heat treated and descaled or turned |
Size, allowance, surface and inspection |
| Cold-finished bar |
Cold drawn, peeled, ground or polished |
Tolerance, straightness and roughness |
| Cut pieces |
Sawn or machined blanks |
Length tolerance, 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 |
Si |
| 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 |
0.80 max |
Values are weight percent; final acceptance follows the ordered standard edition and material test certificate.
Mechanical and Physical Properties
| Property |
Value / requirement |
Purchasing note |
| Tensile strength |
Confirm to ASTM A276 by class and condition |
Confirm ordered size and condition |
| Yield strength |
Confirm to ASTM A276 by class and condition |
Confirm ordered size and condition |
| Elongation |
Reported on the material test certificate |
Confirm ordered size and condition |
| Density |
Approx. 8.0 g/cm³ |
Confirm ordered size and condition |
Heat Treatment, Machining and Fabrication
| Heat treatment |
Condition and cooling practice follow the governing specification and required properties. |
| Machining |
Use suitable tooling and positive feeds; state machining allowance and final surface. |
| Welding / fabrication |
Use qualified procedures and compatible consumables selected for the service condition. |
| Clean handling |
Avoid contamination for corrosion-critical and high-purity applications. |
Inspection and Quality Documentation
| Identity |
Heat number and PMI when ordered |
| Tests |
Chemical and mechanical results on the material test certificate |
| Dimensions |
Diameter, length, straightness and surface inspection |
| NDT |
Ultrasonic or other testing subject to order requirements |
UNS S31254 6Mo Stainless Steel Round Bar Applications
| Industry |
Components |
Selection focus |
| Seawater systems |
Pump shafts, valve stems and fasteners |
High resistance to chloride pitting and crevice corrosion |
| FGD equipment |
Scrubber shafts and internal components |
Resistance in acidic chloride-bearing media |
| Pulp and paper |
Process equipment and machined parts |
Corrosion resistance in bleaching environments |
UNS S31254 6Mo Stainless Steel Round Bar Packaging
Bars are protected according to size, surface, package weight, route and customer specification.
| Condition |
Protection |
Confirmation |
| Hot-finished |
Bundle, skid or wooden support |
Weight and lifting points |
| Ground / polished |
Separators and waterproof wrapping |
Surface and moisture protection |
| Cut pieces |
Blocked wooden case |
Count and traceability |
Procurement Confirmation
State UNS S31254 6Mo Stainless Steel / UNS S31254, standard edition, diameter, length, quantity, condition, tolerance, surface, testing, marking, packing and certificate requirements.
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