1. Introduce
– Stainless steel designed for impact toughness, chloride crevice corrosion, stress corrosion cracking, pitting corrosion resistance
– 6Mo stainless steel with PREN≥42
– Suitable for high chloride environments and offers better chloride resistance than 904L, 316L alloys
– UNS S31254
* 6Mo
– Types : 254SMO, AL6XN, Alloy 25-6, Alloy 926
| Chemical Composition | 254SMo | Al 6XN | Alloy 25-6 | Alloy 926 |
|---|---|---|---|---|
| Cr | 19.5~20.5 | 20.0~22.0 | 19.0~21.0 | 19.0~21.0 |
| Ni | 17.5~18.5 | 23.5~25.5 | 24.0~26.0 | 24.0~26.0 |
| Mo | 6.0~6.5 | 6.0~7.0 | 6.0~7.0 | 6.0~7.0 |
| Strength | 254SMo | Al 6XN | Alloy 25-6 | Alloy 926 |
|---|---|---|---|---|
| Yield Strength (MPa) | Min. 310 | Min. 310 | 295 | Min. 296 |
| Tensile Strength (MPa) | Min. 655~690 | Min. 655 | 650 | Min. 648 |
* UNS
- Abbreviation for the Unified Numbering System for Metals and Alloys
- Unified unique numbering system for metals and alloys
- A representative number compatible with metals and alloys defined in several material-related codes, including ASTM, AISI, ASME, AWS, etc.
* S : Heat and corrosion resistant (stainless) steel
2. Property
– Corrosion resistance, stress corrosion cracking, erosion corrosion, crevice corrosion resistance, good heat resistance
| Element | Impact |
|---|---|
| Ni, Cr, Mo | Provides corrosion resistance, abrasion resistance, erosion resistance |
[254SMo Chemical Composition (%)]
| C | Mn | P | S | Si | Fe |
|---|---|---|---|---|---|
| Max. 0.020 | Max. 1.00 | Max. 0.030 | Max. 0.010 | Max. 0.80 | Bal. |
| Cr | Ni | Mo | Cu | N | |
|---|---|---|---|---|---|
| 19.5~20.5 | 17.5~18.5 | 6.0~6.5 | 0.50~1.00 | 0.18~0.25 |
[254SMo Mechanical Properties]
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) |
|---|---|---|
| Min. 655~690 | Min. 310 | Min. 25 |
[254SMo Physical Properties]
| Density (g/㎤) | Melting Range (℃) | Specific Heat (0-100℃), J/kg*℃ |
|---|---|---|
| 7.94 | 1320~1390 | 500 |
3. Standard & Specification
– Specification : UNS S31254
| ASME | S31254, SA182, SA276, SA479, SA240, SA312 |
| Product Form | ASTM |
|---|---|
| Bar, Rod | A276, A479 |
| Pipe, Tube | A249, A269, A312, A358, A409 |
| Fittings | A182 |
| Forgings | A473 |
4. Available Form
– Bar, Rod
– Sheet, Plate, Strip
– Coil, Wire
– Pipe, Tube
– Forgings
– Fittings, Flanges
5. Application & Product
– Marine, Chemical
| Application | Product |
|---|---|
| Marine | Seawater cooling units, Cooling water pipes, Fire fighting systems, Seawater treatment equipment |
| Chemical | Tanks, Pipelines, Heat exchangers for chemicals |
(1) Seawater cooling equipment / (2) Cooling water pipes / (3) Tanks for chemicals
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