Seamless Stainless steel 654SMO tube
Xinzhe is a premier manufacturer and global supplier of 654SMO (UNS S32654) seamless stainless steel tubes, specializing in ultra-high-performance piping solutions for the world’s most aggressive environments.
Xinzhe，Super-Austenitic Stainless Steel specialist based in Wenzhou, China, we produce 654SMO tubing engineered to withstand extreme chloride concentrations and high-stress conditions. With a Pitting Resistance Equivalent Number (PREN ≥ 56), our seamless 654SMO tubes outperform standard duplex steels and offer a high-strength, cost-effective alternative to expensive nickel-base alloys.
Technical Superiority of 654SMO (UNS S32654)
654SMO is a 7% Molybdenum super-austenitic grade designed for maximum reliability. Key performance benefits include:
Extreme Corrosion Resistance: Exceptional immunity to pitting and crevice corrosion in hot seawater and acidic halide media.
High Mechanical Strength: Significantly higher yield strength than standard 300-series or 904L stainless steels.
Chloride Stability: Superior resistance to Stress Corrosion Cracking (SCC) in high-chloride industrial processes.
Cost Efficiency: Provides "Nickel-Alloy level" performance at a more stable price point for large-scale infrastructure.
Technical Specifications & Manufacturing Range
We provide precision-engineered seamless tubing manufactured to international standards (ASTM A213, ASTM A269, EN 10216-5).
What Is a Seamless Stainless Steel 654SMO Tube?
654SMO (UNS S32654) Seamless Stainless-Steel Tube is a 7% molybdenum super-austenitic stainless steel tube crafted from a single solid billet. It represents the pinnacle of corrosion resistance in the austenitic family, offering a Pitting Resistance Equivalent Number (PREN) of ≥ 56. This grade was specifically developed to handle extremely high-chloride environments and concentrated acids where standard stainless steels fail. Its seamless construction eliminates the risk of weld-line corrosion, providing maximum structural integrity in seawater, pulp and paper processing, and complex chemical environments.
Key Features and Advantages
Seamless 654SMO Stainless Steel Tubes offer exceptional properties that make them the ultimate choice for extreme industrial challenges:
Extreme Pitting and Crevice Corrosion Resistance: With high levels of chromium, molybdenum, and nitrogen, it offers resistance far superior to 904L and 254SMO, especially in stagnant seawater.
Superior Mechanical Strength: It possesses significantly higher tensile strength than most austenitic stainless steels, allowing for thinner wall designs without sacrificing pressure ratings.
Excellent Stress Corrosion Cracking (SCC) Resistance: The high alloy content provides a robust defense against chloride-induced SCC in high-temperature environments.
Outstanding Resistance to Uniform Corrosion: Performs exceptionally well in environments containing halides and acidic solutions such as sulfuric and phosphoric acids.
High Ductility and Impact Strength: Despite its high strength, it maintains excellent formability and impact toughness.
Product Specifications and Data
Table 1: Chemical Composition of Stainless Steel 654SMO
| Cr | Ni | Mo | N | Cu | Mn | Si | C | P | S |
| 24.00 - 25.00 | 21.00 - 23.00 | 7.00 - 8.00 | 0.45 - 0.55 | 0.30 - 0.50 | 2.00-4.00 | ≤ 0.50 | ≤ 0.020 | ≤ 0.030 | ≤ 0.010 |
Table 2: Typical Mechanical Properties of Stainless Steel 654SMO
| Tensile Strength | Yield Strength | Elongation | Hardness |
| ≥ 750 MPa | ≥ 430 MPa | ≥ 40% | ≤ 250 HBW |
Table 3: Typical Physical Properties of Stainless Steel 654SMO
Property | Value |
Density | 8.0 g/cm³ |
Melting Point | 1320 - 1390 °C |
Thermal Expansion | 15.0 µm/m·°C (20-100°C) |
Thermal Conductivity | 13.0 W/m·K (20°C) |
Modulus of Elasticity | 200 GPa |
Common Applications of 654SMO Seamless Tube
The extreme corrosion resistance of seamless 654SMO tubes makes them indispensable for:
- Marine & Offshore Engineering: Subsea piping, desalination plants, and heat exchangers using raw seawater.
- Oil & Gas Industry: Sour gas service, high-pressure flowlines, and chemical injection systems.
- Pulp and Paper Industry: Bleaching plants and highly corrosive processing equipment.
- Flue Gas Desulfurization (FGD): Critical components in power plant scrubbers where high chloride levels exist.
- Chemical Processing: Production of specialty chemicals involving strong acids and halides.
CONTACT US
Lidun Industrial Park, Lidun Town, Zhouning County, Ningde City, Fujian Province，355400，China
+86-577-88877003
+86-577-88877015
+86-577-88877019
+86 13587686960
info@xtd-ss.com
sales@xtd-ss.com
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