🟦 Product Overview

254SMO (UNS S31254 / 1.4547) is a super austenitic stainless steel designed for the most aggressive corrosion environments, especially where conventional stainless steels (304/316/904L) fail.

Its chemical design includes:

• High molybdenum (Mo 6.0–6.5%)
• High nickel (Ni 17.5–18.5%)
• Nitrogen (N 0.18–0.22%)

These elements give 254SMO:

• Extremely high pitting & crevice corrosion resistance
• PREN ≥ 42 (super austenitic level)
• Excellent resistance to chloride stress corrosion cracking
• Superior performance in seawater, brine, and chemical processing

254SMO is widely used in:

• Offshore & marine engineering
• Desalination plants
• Chemical processing
• Pulp & paper industry
• Heat exchangers & evaporators
• High‑chloride industrial systems

It is one of the most corrosion‑resistant stainless steels available before moving into nickel‑based alloys.

🟦 Standards

• ASTM A276
• ASTM A479
• EN 10088
• UNS S31254
• DIN/EN 1.4547
• GB/T 1220 S31254

🟦 Grade Included

• 254SMO (UNS S31254 / 1.4547) — Super Austenitic Stainless Steel

🟦 Product Specifications & Available Sizes

Shapes Available

• Round Bar
• Square Bar
• Hex Bar
• Flat Bar

Diameter Range

• 6–500 mm

Length

• 1–12 m / custom cut

Surface Conditions

• Hot Rolled
• Cold Drawn
• Peeled / Turned
• Polished

🟦 Chemical Composition（254SMO）

Element	Content (%)
C	≤ 0.020
Mn	≤ 1.00
Si	≤ 0.80
P	≤ 0.030
S	≤ 0.010
Cr	19.5–20.5
Ni	17.5–18.5
Mo	6.0–6.5
N	0.18–0.22

📌 High Mo + high Ni + nitrogen = extreme corrosion resistance (PREN ≥ 42).

🟦 Mechanical Properties（Typical）

Property	Requirement
Tensile Strength	≥ 650 MPa
Yield Strength	≥ 300 MPa
Elongation	≥ 35%
Hardness	≤ 270 HB

🟦 Corrosion Resistance Performance

Environment	254SMO Performance
Seawater	Outstanding
Chlorides	Extremely High
Pitting Resistance	Very High (PREN ≥ 42)
Crevice Corrosion	Excellent
Stress Corrosion Cracking	Excellent
Acidic Environments	High

254SMO is often used as a cost‑effective alternative to nickel alloys such as Alloy 625.

🟦 Physical Properties

Property	Value
Density	8.00 g/cm³
Magnetic	Non‑magnetic
Thermal Conductivity	12 W/m·K
Corrosion Resistance	Extremely High

🟦 Manufacturing Processes

• Hot Rolling
• Cold Drawing
• Turning / Peeling
• Grinding / Polishing
• Straightening
• Ultrasonic Testing

🟦 Primary Industry Usage

• Offshore platforms & seawater systems
• Desalination plants (RO, MSF, MED)
• Chemical processing & reactors
• Heat exchangers & evaporators
• Pulp & paper bleaching equipment
• High‑chloride industrial systems

🟦 Why Use 254SMO Stainless Steel Bar

• One of the highest corrosion‑resistant stainless steels
• Excellent performance in seawater & chlorides
• High strength + good ductility
• Ideal for extreme industrial environments
• Cost‑effective alternative to nickel alloys

🟦 Why Choose Jaron Steel

• Full size range of 254SMO stainless bars
• Hot rolled, cold drawn, and polished options
• MTC 3.1 + third‑party inspection
• Export‑grade seaworthy packaging
• Competitive pricing for global buyers