SMO 254
Alloy 6MO tubing is a high-alloy austenitic stainless steel designed for maximum resistance to pitting and crevice corrosion. The high levels of chromium, molybdenum, and nitrogen make 254 SMO (6-moly) suitable for high chloride environments such as brackish water, seawater, pulp mill, bleach plants, and other high chloride process streams. Since alloy 6MO is compatible with the common austenitic stainless steels, it is often used as a replacement in critical components of larger constructions where type 316L or 317L has failed by pitting, crevice attack, or chloride stress corrosion cracking. Though alloy 6MO is substantially stronger than the common austenitic grades, it is also characterized by high ductility and impact strength.
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Description
Alloy 6MO tubing is a high-alloy austenitic stainless steel designed for maximum resistance to pitting and crevice corrosion. The high levels of chromium, molybdenum, and nitrogen make 254 SMO (6-moly) suitable for high chloride environments such as brackish water, seawater, pulp mill, bleach plants, and other high chloride process streams. Since alloy 6MO is compatible with the common austenitic stainless steels, it is often used as a replacement in critical components of larger constructions where type 316L or 317L has failed by pitting, crevice attack, or chloride stress corrosion cracking. Though alloy 6MO is substantially stronger than the common austenitic grades, it is also characterized by high ductility and impact strength.
Alloys 254 / 254 SMO / 6 Mo is an austenitic stainless steel with a high molybdenum content. Coupled with Nickel and Copper this gives the alloy a good resistance to pitting and crevice corrosion, especially in environments containing halide ions, e.g. chloride, bromide and fluoride solutions.
254 SMO (UNS S31254) may offer a cost effective solution to Nickel and Titanium alloys in these environments.
It is designed with a combination of impact toughness resistance to chloride stress corrosion cracking, and pitting and crevice corrosion with strength that is twice that of the stainless steel 300 series.
SMO 254 is a high-alloy austenitic stainless steel developed for use in seawater and other aggressive chloride-bearing media. The steel is characterized by the following properties:
Excellent resistance to pitting and crevice corrosion, PRE = ≥42.5*
High resistance to general corrosion
High resistance to stress corrosion cracking
Higher strength than conventional austenitic stainless steels
Good weldability
*The PRE is defined as, in weight-%, PRE = %Cr + 3.3 x %Mo + 16 x %N
Standards
UNS: S31254
EN Number: 1.4547
EN Name: X1CrNiMoCuN20-18-7
W.Nr.: 1.4529**
SS: 2378*
AFNOR: Z1 CNDU 20.18.06AZ*
SMO 254 Stainless Steel Pipes and Tubes Pipes range
| SMO 254 Stainless Steel Pipes and Tubes Specification | ASTM A269, ASTM A213, ASTM A312, ASME SA269, ASME SA213, ASME SA312 |
| SMO 254 Stainless Steel Pipes and Tubes Grades | 202, 304, 304L, 304H, 304LN, 309S, 310S, 316, 316L, 316H, 316Ti, 316LN, 317L, 321, 321H, 347, 347H, 904L, SMO 254, ALLOY 254, 6MO, 6MOLY, UNS S31254 ETC. |
| SMO 254 Stainless Steel Pipes and Tubes Type | Seamless / Welded / ERW / EFW / Cold Draw / Hot Finish / Cold Finish |
| SMO 254 Stainless Steel Pipes and Tubes Outer Diameter Size | Seamless - 1/2" NB TO 18" NB Welded / ERW- 1" NB TO 16" NB EFW - 8" NB TO 110" NB |
| SMO 254 Stainless Steel Pipes and Tubes Wall Thickness | Schedule 10 to Schedule 160 (3 mm to 100 mm Thickness) |
| SMO 254 Stainless Steel Pipes and Tubes Length | 01 Meter to 12.5 Meters, Single Random Length, Double Random Length And Customize Size. |
| SMO 254 Stainless Steel Pipes and Tubes Ends | Plain Ends / Beveled Ends |
| SMO 254 Stainless Steel Pipes and Tubes Delivery Conditions | As Rolled, Formed, Stress Relieved, Annealed, Hardened, Tempered, Cold Draw |
| SMO 254 Stainless Steel Pipe & Tubes Coating | Electropolish, Mechanical Polish, Satin Finish, Passivated |
| SMO 254 Stainless Steel Pipe & Tubes Other Testing | Product Analysis, Transverse Tension Test, Flattening Test, Etching Test, Radiograph HIC Examination, Stabilizing Heat Treatment, Intergranular Corrosion Test, Weld Decay Test, Magnetic Particle Detection, Grain Size Test, NACE 0175, Dual Grade, PWHT (POST WELD HEAT TREATMENT), Flare Test, Bend Test, Hardness Test, Tensile Test etc |
| SMO 254 Stainless Steel Pipe & Tubes Dimension | All Pipes Is Manufactured and Inspected / Tested to the Relevant standards includingASTM And ASME |
| SMO 254 Stainless Steel Pipe & Tubes Value Added Services | Draw / Expansion / Machining / Sand Blasting / Shot Blasting / Heat Treatment |
| SMO 254 Stainless Steel Pipe & Tubes Packaging | Loose / Bundle / Wooden Pallet / Wooden box-a / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector |
| SMO 254 Stainless Steel Pipe & Tubes Shipment & Transportation | By Road - Truck / Train, By Sea - Break-bulk Conventional Vessel / FCL (Full Container Load) / LCL (Less Container Load) / 20 Feet Container / 40 Feet Container / 45 Feet Container / High Cube Container / Open Top Container, By Air - Freighter Civil Passenger and Cargo Planes |
| SMO 254 Stainless Steel Pipe & Tubes Material Test Certificate | Manufacturer Test Certificate As Per EN10204 3.1, 3.2 / Laboratory Test Certificate From NABL Approved Lab. / Under Third Party Inspection Agency Like SGS, TUV, DNV, LLOYDS, ABS ETC |
Chemical Composition of SMO 254 Stainless Steel Pipes and Tubes
| C | Si | Mn | P | S | Cr | Ni | Mo | N | Cu |
| ≤0.020 | ≤0.80 | ≤1.00 | ≤0.030 | ≤0.010 | 20 | 18 | 6.1 | 0.20 | 0.7 |
Mechanical Properties of SMO 254 Stainless Steel Pipes and Tube
The following table shows Mechanical Properties of stainless steel grade 254 SMO™.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 680 MPa | 98600 psi |
| Yield strength | 300 MPa | 43500 psi |
| Modulus of elasticity | 195 GPa | 28300 ksi |
| Shear modulus | 75 GPa | 10900 ksi |
| Poisson’s ratio | 0.30 | 0.30 |
| Elongation at break | 50 % | 50 % |
| Hardness, Brinell | 210 | 210 |
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