6Mo stainless steel
6Mo/254SMO is a super austenitic stainless steel. At Merinox, we provide tubes of this alloy in multiple thicknesses and dimensions. 6Mo stainless steel contains a minimum of 6% of molybdenum and a high level of nitrogen, providing high resistance to pitting and crevice corrosion, combined with other high strength austenitic stainless steels as 316L, 317L and 904L.
The features of 6Mo stainless steel
These 6Mo stainless steel alloys were developed for use in halide containing environments, such as brackish water, seawater, hydrochloric acid, and sculpture acid. The increased levels of molybdenum combined with chromium and nitrogen provide levels of pitting and crevice corrosion resistance more typically associated with higher alloy 625 (UNS NO6625). The characteristics of this alloy are:
- High resistance to general corrosion
- Excellent resistance to stress corrosion crashing
- Better strength than conventional austenitic stainless steels
- Good weldability
Market applications
6Mo stainless steel is suitable for multiple industries and applications, such as:
- Offshore, oil & gas
- Chemical processes
- Seawater systems
- Control and instrumentation
- Desalination plant equipment
- Pulp and paper processing
Technical details
| Technical composition (%) | Fe | Cr | Ni | Mo | Mn | Cu | Si | P | N | C | S | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 254SMO | min | Bal. | 19.5 | 17.5 | 6.0 | – | 0.5 | – | – | 0.18 | – | – | |||||||||||
| max | – | 20.5 | 18.5 | 6.5 | 1.00 | 1.0 | 0.80 | 0.03 | 0.25 | 0.030 | 0.010 | ||||||||||||
| 6MO | min | Bal. | 20.0 | 23.5 | 6.0 | – | – | – | – | 0.18 | – | – | |||||||||||
| max | – | 22.0 | 25.5 | 7.0 | – | 0.75 | 1.00 | 0.04 | 0.25 | 0.040 | 0.030 | ||||||||||||
| Mechanical properties | 254SMO | 6MO | ||
|---|---|---|---|---|
| Tensile strenght (mpa, min) nl | 650 – 850 | 675 – 875 | ||
| Yield strength (0.2% offset mpa, min) | 300 – 340 | 310 – 350 | ||
| Elongation (%, min) | 35 | 30 | ||
| Density / weight (g / cm3 / kg) | 8.05 | 8.05 |
Let us supply stainless steel tubes
Do you want to use 6Mo stainless steel in your industry? Or are you interested in our other corrosion resistant products, such as our duplex tubes? Please contact us by calling +31 (0)78 – 691 7800 or by sending an e-mail to info@merinox.co.nl. You can also fill out our contact form and we will respond to you as soon as possible.