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AFNOR 254SMO, X1CrNiMoCuN20-18-7, 1.4547, UNS S31254 Details

254SMO, X1CrNiMoCuN20-18-7, 1.4547, UNS S31254 Application:Seamless circular steel tubes for mechanical and general engineering purposes - Technical delivery conditions - Part 2: Stainless steel

Category Type Grade Microstructure Designations
Grades Stainless Steels 254SMO, X1CrNiMoCuN20-18-7, 1.4547, UNS S31254 Austenite France - AFNOR , EN 10028-7 - Flat products made of steels for pressure purposes - Part 7: Stainless steels
EN 10088-1 - Stainless steels - Part 1: List of stainless steels
EN 10088-2 - Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes
EN 10088-3 - Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes
EN 10088-4 - Stainless steels - Part 4: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for construction purposes
EN 10088-5 - Stainless steels - Part 5: Technical delivery conditions for bars, rods, wire, sections and bright products of corrosion resisting steels for construction purposes
EN 10216-5 (2004) - Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 5: Stainless steel tubes
EN 10217-7 - Welded steel tubes for pressure purposes - Technical delivery conditions - Part 7: Stainless steel tubes
EN 10250-4 - Open die steel forgings for general engineering purposes - Part 4: Stainless steels
EN 10253-3 - Butt-welding pipe fittings - Part 3: Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection requirements
EN 10253-4 - Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements
EN 10272 - Stainless steel bars for pressure purposes
EN 10296-2 (2005) - Welded circular steel tubes for mechanical and general engineering purposes - Technical delivery conditions - Part 2: Stainless steel
EN 10297-2 (2005) - Seamless circular steel tubes for mechanical and general engineering purposes - Technical delivery conditions - Part 2: Stainless steel

Chemical composition(wt.%) of 254SMO, X1CrNiMoCuN20-18-7, 1.4547, UNS S31254 grade: EN 10028-7

Elements Min.(≥) Max.(≤) Similar Remarks
C - 0.020
Si - 0.70
Mn - 1.00
P - 0.030
S - 0.010
Cr 19.50 20.50
Mo 6.00 7.00
Ni 17.50 18.50
N 0.18 0.25
Cu 0.50 1.00

Mechanical properties of grade 254SMO, X1CrNiMoCuN20-18-7, 1.4547, UNS S31254 EN 10028-7

Yield Strength,Rp 0.2(MPa)

Condition Min Max Similar Note
300

Tensile Strength,Rm(MPa)

Condition Min Max Similar Note
650 850

Impact,Kv/Ku(J)

Condition Min Max Similar Note

Elongation,A(%)

Condition Min Max Similar Note
35

Reduction of area,(%)

Condition Min Max Similar Note

Hardness

Condition Type Min Max Similar Note
HB 260

Physical properties of grade 254SMO, X1CrNiMoCuN20-18-7, 1.4547, UNS S31254 EN 10028-7

Modulus of elasticity, E Note
195 GPa
Thermal conductivity λ Note
14 W ⋅ m⁻¹ K⁻¹
Heat capacity cp20℃ Note
500 J ⋅ ​kg⁻¹ K⁻¹
Densityρ Note
8.10 kg/dm³
Annealing Note
1050 - 1150℃

Seamless circular steel tubes for mechanical and general engineering purposes - Technical delivery conditions - Part 2: Stainless steel, Stainless steel used in cryogenic, paper, chemical, petrochemical and refining industries, in power plants for heat exchangers, radiators, in aviation construction as aviation steel, screws, valves, heat exchangers, coolers, special tanks, pumps and pipelines.Steel resistant to intergranular corrosion in the sensitized and in the delivery conditions.

254SMO, X1CrNiMoCuN20-18-7, 1.4547, UNS S31254 - Form of Supply

Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED

Cross Reference Table(Equivalent Grade)

Grade Standard Country Application
254SMO, X1CrNiMoCuN20-18-7, 1.4547, UNS S31254 AFNOR France
Seamless circular steel tubes for mechanical and general engineering purposes - Technical delivery conditions - Part 2: Stainless steel

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