HT PIPE is a SS 254smo Pipe supplier with 15+ export experience. Contact us for more information and quotes for free!
Looking for a premium, high-alloy material capable of handling aggressive chloride environments? 254 SMO is a 6% Molybdenum super austenitic stainless steel designed with a chemical matrix that bridges the gap between conventional austenitic steels and costly nickel alloys.
At HTSteelPipe, we manufacture and supply a comprehensive inventory of 254 SMO pipes, tubes, sheets, and flanges, fully certified to meet rigid global industrial standards.
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- Standard Specifications: ASTM A312, ASTM A240, ASTM A182, ASME SA240
- Product Forms: Seamless/Welded Pipes, Sheets, Plates, Bar Stock, Pipe Fittings, and Flanges
- Guaranteed Quality: Mill Test Certificates (MTC) to EN 10204 3.1 provided with every shipment
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254 SMO (UNS S31254) Chemical Composition Limit (%)
The outstanding localized corrosion resistance of Alloy 254 SMO is a direct result of its highly precise chemical formulation. Below is the standard chemical makeup required to satisfy ASTM and EN specifications:
| Element | Symbol | Minimum (%) | Maximum (%) |
| Chromium | Cr | 19.50 | 20.50 |
| Nickel | Ni | 17.50 | 18.50 |
| Molybdenum | Mo | 6.00 | 6.50 |
| Nitrogen | N | 0.18 | 0.22 |
| Copper | Cu | 0.50 | 1.00 |
| Carbon | C | - | 0.020 |
| Manganese | Mn | - | 1.00 |
| Silicon | Si | - | 0.80 |
| Phosphorus | P | - | 0.030 |
| Sulfur | S | - | 0.015 |
| Iron | Fe | Balance | Balance |
Fabricability, Machining, and Welding Guidelines
Due to its high work-hardening rate, processing 6Mo Super Austenitic Stainless Steel requires experienced adherence to technical manufacturing standards:
Welding Procedures: 254 SMO exhibits good weldability using standard gas tungsten arc welding (GTAW/TIG) or gas metal arc welding (GMAW/MIG). However, due to the risk of molybdenum segregation in the weld pool, over-alloyed filler metals like Alloy 625 (ERNiCrMo-3) must be used to preserve full corrosion protection across the seam joint.
Machining Speeds: The structural toughness means the alloy resists cutting forces. Machinery must employ low, positive feed speeds, sharp heavy-duty tooling, and rich flood lubrication to prevent glazing.
Key Global Industrial Applications
- Desalination Systems & Marine Infrastructure: High-pressure reverse osmosis (RO) pipelines and warm seawater handling systems.
- Chemical Processing Plants: Transporting aggressive halide streams, organic solvents, and dilute reducing acids.
- Pulp & Paper Bleaching: Bleach plant washers, vats, and press rolls subjected to aggressive chlorine dioxide environments.
- Flue Gas Desulfurization (FGD): Scrubber units within thermal power plants filtering corrosive acidic smoke.
Why Partner with HTSteelPipe?
As a specialized industrial pipeline equipment manufacturer, we eliminate middleman markups. We offer exact cut-to-length customization, rigid sea-freight protective packaging (individually VCI paper-wrapped and reinforced wooden crated), and lightning-fast worldwide delivery times ranging from 5 to 21 days.
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