Yes, the extremely high Critical Pitting Temperature (CPT) of more than 70°C makes these pipes ideal for use in hot seawater and aggressive marine environments where standard stainless steels fail.
ASTM A312 SMO 654 Seamless Pipe Manufacturer
We at Zhejiang Xintongda Special Steel specialise in manufacturing and supplying 654 SMO pipes. These seamless super austenitic stainless steel pipes are designed for extreme corrosion resistance. These products contain 24-26% chromium, 21-23% nickel, 7-8% molybdenum, and 0.45–0.55% nitrogen. This composition delivers a Critical Pitting Temperature (CPT) typically above 70°C. We manufacture these products in strict compliance with the ASTM, EN, JIS and GB standards. It offers nearly twice the yield strength of standard 300 series stainless steels. This feature has led to the wide use of our 654 SMO pipes in seawater and aggressive chemical environments. It is resistant to chlorides, to a great extent. Before delivering, every pipe is subjected to quality tests to ensure that it is of the highest standard. Our annual manufacturing capacity is 25,000 tons and the lead time is about a week for stock and 15-60 days for production orders. Detailed technical data is provided on the page for better reliability.
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Standard
ASTM A312
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OD Range
6-1016 mm
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Thickness
1-65 mm
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Length
≤ 18 m
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Technical Data
Technical Data
SMO 654 Stainless Steel Seamless Pipe Manufacturing Process
The production of high-grade 654 SMO pipes involves a precise sequence of heating solid billets to 1200°C, followed by mandrel piercing to create a high-quality hollow shell. We use advanced techniques such as EAF and AOD/VOD melting, hot extrusion, and cold working methods like pilgering. These processes ensure precise dimensions and a smooth, high-quality surface finish. Each pipe goes through solution annealing and pickling to ensure strong corrosion resistance. The last step is to perform straightening and send it for rigorous pressure testing. Learn more about our seamless pipe manufacturing process.
What are the Key Features of SMO 654 Stainless Steel Pipe?
The selection of our SMO 654 stainless steel pipe provides distinct technical advantages for critical engineering projects. This alloy is made to perform where standard stainless steels fail. The following 5 key features define the performance:
- Superior Chloride Corrosion Resistance: As it has a good amount of chromium, molybdenum, and nitrogen content, Our SMO 654 pipe achieves a PREN of approximately 56. This chemical composition provides superior resistance to chloride pitting and crevice corrosion.
- High Strength and Ductility: High nitrogen content grants this super austenitic stainless steel approximately twice the yield strength of standard 300 series alloys. Even with higher strength, the material stays very ductile and tough. This allows complex parts to be made without risk of brittle failure.
- Wide Temperature Operating Range: These pipes perform reliably in both high-temperature and cryogenic conditions. Our 654 SMO pipe resists scaling and oxidation at service temperatures up to approximately 400°C (752°F). This makes it a strong choice for heat exchangers and power generation equipment.
- Good Oxidation Resistance: SMO 654 has a high amount of chromium, which forms a protective layer of chromium oxide to prevent oxidation.
- Excellent Weldability and Fabrication Suitability: Designed for good workability and formability, these pipes allow for easy integration into complex systems. The material is highly weldable. However, using over-alloyed filler metals is recommended to keep the welds as corrosion-resistant as the base metal.
ASTM A312 S32654 Seamless Pipe Equivalent Material
Alloy 654 seamless pipe is primarily identified by the designation UNS S32654 under the ASTM A312 specification. This material is recognised globally under various standards, ensuring compatibility with international engineering requirements.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| 654 SMO | S32654 | S32652 | 015Cr20Ni18Mo6CuN | - | X1CrNiMoCuN24-22-6 | 1.4652 | - |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI (Positive Material Identification)
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate
- Laboratory Test Certificate from the Government-Approved Lab
SMO 654 Seamless Pipe Industry
The implementation of 654 SMO pipes is essential across various industries where equipment failure is avoided. Below are 5 primary applications where SMO Alloy 654 pipe is used:
Oil Refining
Used extensively for sour gas handling and high-chloride process streams, these pipes prevent stress corrosion cracking in offshore platforms. Downhole components benefit from the alloy's ability to resist the aggressive mixtures of hydrogen sulfide and chlorides found in deep wells.
Thermal Power Generation
These pipes are a standard choice for flue gas desulfurization (FGD) systems, where they must resist acidic condensates. The high molybdenum content ensures that cooling water systems remain free from pitting even when using brackish or recycled water.
Chemical and Petrochemical Industry
We supply our 654 SMO pipes for transporting sulfuric and phosphoric acid solutions, chlorinated organic processing, and desalination plants.
Paper Manufacturing Industry
Crucial for chlorine dioxide bleaching stages, digesters, and white liquor handling systems. In these environments, high temperatures and chloride levels are prevalent, and the alloy effectively prevents rapid equipment degradation and unplanned downtime.
Nuclear Power Generation
Our pipes ensure reliable long-term performance of nuclear plant cooling circuits and essential infrastructure.
Frequently Asked Questions
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Can 654 SMO pipes be used in seawater applications?
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How does 254SMO compare to 654SMO Pipe?654SMO has more chromium, nickel, molybdenum, and nitrogen than 254SMO. This makes it much more resistant to crevice corrosion and pitting in very acidic and high-chloride conditions.
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What standards does 654SMO meet?The 654SMO meets the ASTM A312 standard.