ASTM A312 S31254 Pipe manufacturer, supplier, contact us for free quote and sample!
UNS S31254, 254SMO is a high-performance super austenitic stainless steel pipe. It has become a key material in the fields of chemical industry, marine engineering, energy, etc. due to its excellent performance in extreme corrosive environments. HT PIPE is a S31254 Pipe supplier with 15+ export experience. Contact us for more information and quotes for free!
chemical composition of S31254 pipe
The chemical composition of S31254 is the core of its performance. Its typical composition is: chromium (Cr) 19.5%-20.5%, nickel (Ni) 17.5%-18.5%, molybdenum (Mo) 6.0%-6.5%, nitrogen (N) 0.18%-0.22%, and strictly control carbon (C≤0.02%) and impurities such as sulfur and phosphorus.
SMO 254 Pipes Mechanical & Physical Properties
| Element | SMO 254 |
| Density | 8.0 g/cm3 |
| Melting Point | 1320-1390°C |
| Tensile Strength | 650 |
| Yield Strength (0.2%Offset) | 300 |
| Elongation | 35% |
| Hardness (HB) max | 220 |
Manufacturing Process: 254SMO Seamless vs. Welded Pipes
To meet diverse industrial piping specifications, we supply this material in two distinct manufacturing forms:
254SMO Seamless Pipe (ASTM A312 / ASTM B622)
Manufactured via hot-rolled piercing or extrusion followed by precision cold drawing and cold rolling. This process yields tight dimensional tolerances, flawless surface finishes, and superior high-pressure performance.
S31254 Welded Pipe (ASTM A312 / ASTM B619)
Produced from high-quality steel strips or plates via automated longitudinal welding. We use advanced pulsed argon arc welding (TIG) paired with low heat inputs and specialized over-alloyed nickel-based filler metals (such as ERNiCrMo-3). This method eliminates thermal cracking and limits intergranular alloy segregation in the weld seam.
Critical Heat Treatment & Solution Annealing
All of our 254SMO piping undergoes rigorous solution annealing at 1149°C (2100°F) followed by a rapid water quench. This essential thermal processing dissolves harmful intermetallic phases, homogenizes key alloying elements, and fully restores maximum corrosion resistance before shipping.
Quality Control, Testing Standards, and Dimensions
Every single production batch undergoes comprehensive quality assurance testing to guarantee total compliance with global procurement standards:
Dimensional Integrity: Full availability across standard schedules, including Schedule 10S, Sch 40S, and Sch 80S.
Non-Destructive Testing (NDT): 100% Hydrostatic testing and Eddy Current or Ultrasonic inspections.
Corrosion Testing: Strict evaluation via ASTM G48 Method A pitting and crevice corrosion testing to confirm absolute reliability.
Documentation: Complete Mill Test Certificates (MTC) provided in full accordance with EN 10204 3.1 or 3.2.
Your Trusted 254SMO Pipe Supplier
Are you looking for a dependable manufacturing partner for your next major project? HT PIPE offers competitive pricing, fast lead times, and comprehensive technical support for your global infrastructure needs. Reach out to our specialist sales team now at market@htpipe.com to request an active quote or get professional advice on your specific piping dimensions.
