What Is 254 Smo Material?
254 SMO Stainless Steel Plate is a super austenitic stainless steel containing 6-6.5% molybdenum, hence also known as 6 moly. S31254 material exhibits exceptional resistance to pitting, crevice corrosion, and chloride attack.
Additionally, its yield strength is nearly double that of conventional austenitic stainless steels. It is particularly suitable for marine engineering, chemical processing, and the oil and gas industries. SMO 254 is readily machinable into plates, sheets, and custom pipe fittings.
SS 254 Smo Material Data Sheet Specification
|
Specification |
ASTM A240 / ASME SA240 / NACE MR-0175 |
|
Sizes |
1000 x 2000 mm, 1220 x 2440 mm, 1500 x 3000 mm, 2000 x 2000 mm, 2000 x 4000 mm Cold rolled 254 SMO Plate 0.5-6.4 mm Hot rolled 254 SMO Plate 3.0–10.0 mm |
|
Thickness |
0.1 to 50 mm |
|
Width |
10-2500mm, 1000mm, 1500mm, 1800mm,2500mm etc |
|
Length |
2m, 2.44m, 3m, or as required |
|
Finish |
2B, 2D, BA, NO(8), Cold rolled sheet (CR), Hot rolled plate (HR) |
|
Form |
Plates, Flats, Coils, Plain Sheet, Strip, Shim Sheet |
Plate 254 Smo Composition
|
Elements |
Carbon |
Chromium |
Nickel |
Molybdenum |
Nitrogen |
Fe |
Manganese |
Phosphorous |
Sulphur |
Silicon |
Copper |
|
254 SMO |
0.015 |
20 |
18 |
6.1 |
0.2 |
54 |
0.7 |
0.03 |
0.01 |
0.4 |
0.7 |
254 SMO Sheet Mechanical Properties
Tensile Strength: 650
Yield Strength (0.2%Offset): 300
Elongation: 35 %
Hardness(Brinell) MAX: 223
Hardness (Rockwell B) MAX: 96
254 SMO UNS S31254 Plate Physical Properties
Density: 8.0 g/cm3
Melting Point: 1320-1390 ℃
Stainless 254 SMO Equivalent
|
STANDARD |
WERKSTOFF NR. |
UNS |
SIS |
AFNOR |
EN |
|
254 SMO Plate |
1.4547 |
S31254 |
2378 |
Z1 CNDU 20.18.06Az |
X1CrNiMoCuN20-18-7 |
ASTM A240 Alloy 254 SMO Hot Rolled Plate Weight
|
Thickness |
254 SMO Plate Weight per Unit Area |
|
1/4 |
0.008 lbs/in² 56.0245568 kg/m² |
|
3/16 |
0.006000 lbs/in² 42.0184176 kg/m² |
|
1/2 |
0.0161 lbs/in² 113.01942056 kg/m² |
|
3 |
0.0941 lbs/in² 661.05884936 kg/m² |
|
3/8 |
0.0121 lbs/in² 85.00714216 kg/m² |
|
5/8 |
0.0196 lbs/in² 137.08016416 kg/m² |
|
1 |
0.0313 lbs/in² 220.00607848 kg/m² |
|
3/4 |
0.0235 lbs/in² 165.0221356 kg/m² |
|
7/8 |
0.0274 lbs/in² 192.06410704 kg/m² |
|
1 1/2 |
0.047 lbs/in² 330.0442712 kg/m² |
|
1 1/4 |
0.0391 lbs/in² 274.09002136 kg/m² |
|
2 |
0.0627 lbs/in² 440.08246392 kg/m² |
|
1 3/4 |
0.0549 lbs/in² 385.09852104 kg/m² |
|
2 1/2 |
0.0784 lbs/in² 551.02065664 kg/m² |
|
2 1/4 |
0.0705 lbs/in² 495.0664068 kg/m² |
|
2 3/4 |
0.0862 lbs/in² 606.00459952 kg/m² |
Alloy 254 SMO Plate Hot Working fabrication
Forging and upsetting can be performed at 982-1149°C (1800-2100°F).
SMO 254 Plate Annealing
Annealing should be performed at 1149-1204°C (2100-2200°F), followed by a water quench.
How To Weld Type 254 Smo Stainless Steel?
Use TIG (GTAW) for thin-walled sheets;
MIG (GMAW) is suitable for thicker plates;
Interpass temperature must be maintained below 150°C/302°F.
Select filler metal, such as AWS A5.14 ERNiCrMo-3 or equivalent material.
SS 254 SMO VS AL6XN
254 SMO has a higher molybdenum content (6-6.5% vs 6%), and 254 SMO performs well in seawater and neutral chloride environments. AL6XN offers superior corrosion resistance in sulfuric acid and high-temperature chloride environments. AL6XN is more expensive.
ALLOY 254 SMO VS 316
The corrosion resistance of 254 SMO is significantly higher than that of TP316.
254 SMO VS 904L
In sulfuric acid containing chloride ions, 254 SMO also exhibits superior corrosion resistance compared to 904L.
JN 254SMO Supplier and Manufacturer
- One-stop service providers.
- Free samples.
- ISO9001, CE certification, SGS, BV third-party testing.
- Customized services.
- Factory direct sales.
We provide pipes, plates, round bars, pipe fittings (elbow, tee, reducer, cross, coupling, pipe nipple, bushing, plug, union, etc), flanges, Contact us for price lists, sizes, and free samples!
