1. Introduce
– Precipitation hardening martensitic stainless steel
– Molybdenum alloy with approximately 13% chromium and 8% nickel
– Molybdenum alloy provides better pitting and corrosion resistance than other PH alloys, 15-5PH and 17-4PH
– UNS S13800
* 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
[Compared to other alloys]
(1) 316
| Properties | 13-8Mo | 316 |
|---|---|---|
| Tensile strength | Excellent | Low |
| Hardness | Excellent | Low |
| Corrosion resistance | Similar | Similar |
| Heat resistance | Good | Low |
(2) 17-4PH
| Properties | 13-8Mo | 17-4PH |
|---|---|---|
| Tensile strength | Similar | Similar |
| Hardness | Excellent | Low |
| Corrosion resistance | Excellent | Good |
(3) Inconel Super Alloy
| Properties | 13-8Mo | Inconel Super Alloy |
|---|---|---|
| High temperature strength | Low | Excellent |
| Corrosion resistance | Similar | Similar |
2. Property
– Good strength, stress corrosion resistance, hardness, ductility, toughness, heat resistance
| Element | Impact |
|---|---|
| Cr, Ni, Mo | Balanced content of Cr, Ni, Mo provides high strength through precipitation hardening and excellent corrosion resistance in various environments (Cr : High Cr content provides excellent corrosion resistance by forming a chromium oxide layer on the surface) |
| C | Low carbon content for excellent toughness |
| Al, Ti | A small amount of Al and Ti form carbides and carbonates, providing excellent high temperature strength |
[13-8Mo Chemical Composition (%)]
| C | Mn | P | S | Si |
|---|---|---|---|---|
| Max. 0.05 | Max. 0.20 | Max. 0.010 | Max. 0.008 | Max. 0.10 |
| Cr | Ni | Al | Mo | |
|---|---|---|---|---|
| 12.25~13.25 | 7.50~8.50 | 0.90~1.35 | 2.00~2.50 |
[13-8Mo Mechanical Properties]
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) |
|---|---|---|
| 1380~1585 | 1240~1450 | 10~15 |
[13-8Mo Physical Properties]
| Density (g/㎤) | Melting Range (℃) | Specific Heat (0-100℃), J/kg*℃ |
|---|---|---|
| 7.7~7.8 | 1370~1400 | 460 |
3. Standard & Specification
– Specification : UNS S13800
| Product Form | ASTM | AMS | ASME |
|---|---|---|---|
| Bar, Rod | A564 | 5629 | SA564 |
| Plate, Sheet, Strip | A564, A693 | 5864 | SA693 |
| Wire, Coil | A564 | 5864 | SA564 |
| Forgings | A705 | – | SA705 |
4. Available Form
– Bar, Rod
– Sheet, plate
– Strip, Coil, Wire
– Forgings
– Powder
5. Application & Product
– Aerospace, Oil & Gas, Chemical Processing, Automotive, Marine
| Application | Product |
|---|---|
| Aerospace | Landing gear, Fittings, Hydraulic assemblies, Fasteners, Valves |
| Oil & Gas | Packers, Downhole tools, Valves |
| Chemical Processing | Pumps, valves, Pressure vessels, Heat exchangers |
| Automotive | Valves, Fasteners, Fittings, Shafts |
| Marine | Shafts, Desalination equipment |
(1) Landing gear / (2) Packers / (3) Pressure vessels / (4) Valves / (5) Shafts
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