| Material: | 254 SMo，1.4547， UNS 31254 ，1.4529， Z1 CNDU 20.18.06AZ | Testing: | Eddy Current Test ， Hydrostatic Test ， UT ， PT |
|---|---|---|---|
| Specification: | ASTM A269， A213， A312， NFA 49-217， EN 10216-5 | Appilcation: | Chemical Industry ， Heat Exchanger， Boiler， Offshore， Platform ，Subsea |
| Norsok: | Norsok MDS R11/R18， IOGP S-563 MDS IR111/111S/IR118/IR118S | Standard: | ASTM，ASME，AISI |
| High Light: | uns s31254 duplex stainless steel pipe， offshore duplex stainless steel pipe， 254smo duplex pipe | ||
254SMO PREMIUM ALLOY A312 UNS S31254 DUPLEX STEEL
Overview
254SMo stainless steel has excellent acid， alkali， seawater， and chloride corrosion resistance， especially in high chloride and acidic environments. Its corrosion resistance is even more outstanding.
High strength and toughness: Due to its high molybdenum， nitrogen， chromium， and low-carbon chemical composition， 254SMo stainless steel has good resistance to stress corrosion cracking， durability， and toughness， and can also work at high temperatures and pressures.
Good wear resistance and corrosion cracking resistance: Due to its special chemical composition， 254SMo stainless steel has good wear resistance and corrosion cracking resistance， and can maintain high performance in harsh working environments.
Large size seamless steel pipe: Compared with other steels， 254SMo stainless steel has certain processing properties， can produce large size seamless steel pipes， and has excellent spanwise welding performance.
254 SMO Properties:
- Excellent resistance to pitting and crevice corrosion， PRE = ≥42.5%
- High resistance to general corrosion
- High resistance to stress corrosion cracking
- Higher strength than conventional austenitic stainless steels
- Good weldability
Heat Treatment
The tubes are delivered in heat treated condition. If additional heat treatment is needed due to further processing the following is recommended.Solution annealing 1150–1200°C (2100–2190°F)， quenching in water. Thin-walled tubes min. 1130°C (2060°F)， quenching in air/water.
254SMO Equivalent Grades
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | SIS | EN |
| 254SMO | S31254 | 1.4547 | Z1 CNDU 20.18.06Az | 2378 | X1CrNiMoCuN20-18-7 |
254SMO Mechanical Properties
| Wall thickness | Proof strength | Tensile strength | Elong. | Hardness | ||
|---|---|---|---|---|---|---|
| mm | Rp0.2a) | Rp1.0a) | Rm | Ab) | A2" | HRB |
| MPa | MPa | MPa | % | % | ||
| <5 | ≥310 | ≥340 | 675-850 | ≥35 | ≥35 | ≤96 |
| >5 | ≥310 | ≥340 | 655-850 | ≥35 | ≥35 | ≤96 |
C | Si | Mn | P | S | Cr | Ni | Mo | N | Cu |
| ≤0.020 | ≤0.80 | ≤1.00 | ≤0.030 | ≤0.010 | 20 | 18 | 6.1 | 0.20 | 0.7 |
254 SMO Applications:
- Ocean: Marine structures in the marine environment， desalination， aquaculture， seawater heat exchange
- Environmental protection fields: flue gas desulfurization devices for thermal power generation， wastewater treatment
- Energy fields: atomic power generation， comprehensive utilization of coal， ocean tide power generation， etc.
- Petrochemical industry: oil refining， chemical equipment and other food industries: salt making， soy sauce brewing， etc.
- High concentration chloride ion environment: papermaking industry， various bleaching devices
