Alloy 254 SMO Plate

UNS S31254, also known as Alloy 254 SMO or EN 1.4547 is a premium super-austenitic stainless steel designed for the most aggressive corrosive environments. It contains very high levels of chromium (19.5–20.5%), nickel (17.5–18.5%), molybdenum (6.0–7.0%) and nitrogen (0.18–0.25%). HT PIPE is a SS 254smo Plate supplier with 15+ export experience. Contact us for more information and quotes for free!

 

ASTM A240 S31254 Plate Specification

Specification	ASTM A240 UNS S31254, ASME SA240, MSRR, AMS, BS
Sizes (mm)	1000 x 2000, 1220 x 2440, 1500 x 3000, 2000 x 2000, 2000 x 4000
Thickness	0.1 to 100 mm Thk
Width	10-2500mm
Length	2m, 2.44m, 3m, or as required
Finish	HR, CR, 2B, 2D, BA, NO(8), SATIN
Hardness	Soft, Hard, Half Hard, Quarter Hard, Spring Hard etc.
Stock in form of	hot-rolled, Coils, Rolls, Circle, Flat, Sheet, cold-rolled, Strip, Checker, sheared, Flats, Rolling, Shim, Clad, Tread, Foils, soft-annealed, descaled, annealed, Plate, Blank

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254 SMO Steel Plate Mechanical Properties 

Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
8.0 g/cm3	1320-1390 ℃	650	300	35 %

 

Advantages of 254smo Plate

ss254smo Exceptional Corrosion Resistance

The high Cr–Mo–N alloying gives S31254 outstanding resistance to pitting, crevice corrosion, stress corrosion cracking, corrosion fatigue and general corrosion. In chloride or bromide environments ,S31254 maintains integrity where 316L/304 fail. It also resists chlorinated cleaning agents and oxidizing acids very well.

 

smo254 High Mechanical Strength

S31254 has roughly twice the yield strength of 316/304 stainless. This allows thinner sections or higher pressure ratings in equipment. Its tensile strength (~690–850 MPa in sheet/coil, ≤220 HB) mean robust resistance to deformation and wear. At the same time, its high ductility (elongation ≥35%) ensures toughness in service and ease of forming.

 

6mo High Temperature Performance

S31254 is stable to elevated temperatures. Solution-annealed above ~1150 °C, it retains strength and resists scaling up to ~600–650 °C in air, far better than 904L (which softens above ~400 °C). Its melting point (~1320–1390 °C) is high for stainless steel. Thermal conductivity is relatively high (~14 W/m·K), which helps in heat-exchanger duties.

 

S31254 Hot and Cold rolling Sheet Fabricability and Safety

S31254 offers good formability and very good weldability. It welds without pre-heating, though it work-hardens quickly – so proper filler (AWS A5.14 ERNiCrMo-3) and technique are recommended. Its low carbon/Ni make it resistant to sigma-phase or carbide sensitization; it maintains ductility even at cryogenic temperatures.

 

Imperial dimensions & sizes of 254 SMO Plate in stock

Alloy 254 SMO Plate Surface finish	Thickness (in)	Width (in)
BA Mexinox only	18–28	max. 48
1 – Hot rolled, heat treated, pickled A240 UNS S31254 254 SMO Alloy Plate & Sheet	.1000 – .3750	max. 72
2R – Cold-rolled, bright-annealed 254 SMO Plate	0.002–0.06	0.118–25.551
2H – Work hardened Grade 1.4547 254 SMO AISI Plate & Sheet	0.002–0.06	0.118–24.803
2B – Cold rolled, heat treated, pickled, skin passed 254 SMO Super Duplex Sheet & Plate	10–24	max. 72*
2D – Cold rolled, heat treated, pickled 254 SMO Plate	12–24	max. 60
Deco Rolled-On Mexinox only	14–28	max. 48
Avesta 254 SMO Polished Plate & Sheet (not brushed)	11–24	max. 60
Temper rolled Mexinox only	13–29	max. 48

 

Smo 254 Plates Weights

Thickness	Plate Weight per Unit Area	Density
3/16 inches	0.06000 lbs/in²42.184176 kg/m²	0.315 lbs/in³8.72 g/cm³
1/4 inches	0.08 lbs/in²56.245568 kg/m²	0.315 lbs/in³8.72 g/cm³
3/8 inches	0.121 lbs/in²85.0714216 kg/m²	0.315 lbs/in³8.72 g/cm³
1/2 inches	0.161 lbs/in²113.1942056 kg/m²	0.315 lbs/in³8.72 g/cm³
5/8 inches	0.196 lbs/in²137.8016416 kg/m²	0.315 lbs/in³8.72 g/cm³
3/4 inches	0.235 lbs/in²165.221356 kg/m²	0.315 lbs/in³8.72 g/cm³
7/8 inches	0.274 lbs/in²192.6410704 kg/m²	0.315 lbs/in³8.72 g/cm³
1 inches	0.313 lbs/in²220.0607848 kg/m²	0.315 lbs/in³8.72 g/cm³
1 1/4 inches	0.391 lbs/in²274.9002136 kg/m²	0.315 lbs/in³8.72 g/cm³
1 1/2 inches	0.47 lbs/in²330.442712 kg/m²	0.315 lbs/in³8.72 g/cm³
1 3/4 inches	0.549 lbs/in²385.9852104 kg/m²	0.315 lbs/in³8.72 g/cm³
2 inches	0.627 lbs/in²440.8246392 kg/m²	0.315 lbs/in³8.72 g/cm³
2 1/4 inches	0.705 lbs/in²495.664068 kg/m²	0.315 lbs/in³8.72 g/cm³
2 1/2 inches	0.784 lbs/in²551.2065664 kg/m²	0.315 lbs/in³8.72 g/cm³
2 3/4 inches	0.862 lbs/in²606.0459952 kg/m²	0.315 lbs/in³8.72 g/cm³
3 inches	0.941 lbs/in²661.5884936 kg/m²	0.315 lbs/in³8.72 g/cm³

 

 

 

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