Products Description
Product Specifications
| Standards | ASTM A312 / A312M |
| Steel Grades | UNS S31254 (254 SMO / 6Mo) |
| Equivalent Standards | EN 10216-5, ASTM A240,ASTM A276,ASTM A182 |
| Outer Diameter (OD) | 6 mm - 630 mm |
| Wall Thickness (WT) | 0.5 mm – 55 mm |
| Length | 6 m / 12 m,customized |
| Surface Treatment | Pickled & Annealed |
| Production Process | Hot Rolled, Cold drawn, Cold Rolled |
| Condition | Solution Annealed |
254 SMO stainless steel supports continuous operation at temperatures up to 540°C; it maintains its toughness at low temperatures without undergoing a brittle transition, making it suitable for a wide operating range of -40°C to 540°C. It exhibits a gradual decline in strength as temperatures rise and offers superior high-temperature corrosion resistance compared to standard austenitic stainless steels.
254 SMO possesses high mechanical strength-with a yield strength 1.8 times that of 316L (170 MPa)-allowing it to withstand higher pipeline pressures and equipment loads. It is well-suited for high-pressure chemical reactions and high-temperature transport applications, offering enhanced resistance to deformation and impact.
Customized Services
- TORICH offers custom sizing and precision cutting services, with tolerances controlled within ±1 mm.
- Special end treatments-such as beveling, plain ends, threading, flanging, expanding, and swaging-can be customized.
- We also support segmented hole cutting, beveling, and bending to meet the requirements of complex piping layouts in chemical processing applications.
Chemical Composition
| Element | C (%) | Mn (%) | P (%) | S (%) | Si (%) | Cr (%) | Ni (%) | Mo (%) | N (%) | Fe (%) |
| 254 SMO | ≤ 0.020 | ≤ 1.00 | ≤ 0.030 | ≤ 0.010 | ≤ 0.80 | 19.5 – 20.5 | 17.5 – 18.5 | 6.0 – 6.5 | 0.18 – 0.22 | Balance |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength 0.2%(MPa) | Elongation (%) | Hardness (HB) |
| 254 SMO | ≥ 650 | ≥ 300 | ≥ 35 | ≤ 223 |
Possible Alternative Grades
- For standard chemical processing applications involving mild corrosion-such as the transport of ambient-temperature fresh water or weak acids and alkalis-316L stainless steel is a suitable choice, offering lower costs than 254 SMO.
- 904L has a PREN value of 32–35; its corrosion resistance in high-chloride environments is significantly lower than that of 254 SMO, making it suitable for chemical projects with limited budgets that do not require resistance to high-chloride corrosion.
- AL-6XN super austenitic stainless steel offers performance comparable to 254 SMO, with a PREN value of approximately 45 and slightly superior corrosion resistance; while it is suitable for extremely harsh, high-chloride environments, its higher procurement cost results in a lower cost-performance ratio compared to 254 SMO.
application areas
ASTM A312 254 SMO stainless steel features a Pitting Resistance Equivalent Number (PREN) of 42–45, along with excellent resistance to localized corrosion, high mechanical strength, and good weldability. It is primarily used in the chemical processing industry for the following applications:
- Chemical process piping systems
- Heat exchangers for handling corrosive chemicals
- Acid production and transport systems
- Chlor-alkali processing plants
- Piping for reactors and pressure vessels
- Fertilizer production facilities
- Acid gas scrubbing and treatment systems
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Can 254 SMO replace 904L in acidic chemical processing environments?
A: Yes. 254 SMO not only retains 904L's excellent resistance to organic and reducing acids, but its high molybdenum content also gives it superior resistance to chloride corrosion and high temperatures compared to 904L, making it suitable for complex chemical environments involving mixed acids and alkalis or acidic media containing chlorides.
Q: Is 254 SMO seamless pipe suitable for high-chloride chemical media such as seawater and brine?
A: 254 SMO has a critical pitting temperature of ≥50°C and an exceptionally high PREN value, allowing it to withstand highly corrosive, high-chloride media-such as seawater, concentrated brine, and high-salinity wastewater-over the long term; it is suitable for applications like seawater desalination and chemical brine circulation systems.
Q: What are the welding characteristics of 254 SMO? Is post-weld heat treatment required?
A: It offers excellent weldability, and post-weld heat treatment is generally not required; however, in highly corrosive environments, post-weld pickling and passivation are recommended to restore corrosion resistance.
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