SS 13-8 PH Stainless Steel
SS 13-8, otherwise known as UNS S13800 or PH 13-8, is a martensitic precipitation-hardening, stainless-steel alloy that stands out for its valuable mechanical properties and high chromium deposit. Hence, it’s no surprise that it possesses excellent strength, toughness, hardness, and corrosion resistance, which are employed in industrial, nuclear, petrochemical, and aerospace applications.
The age-hardenable stainless steel is able to withstand extreme atmospheric conditions. This is due to its good traverse toughness properties that can be obtained through controlled chemical composition and crystal structure, along with a double-melting technique that entails the use of a Vacuum Induction Furnace (VIM), followed by Electroslag Remelting (ESR) or Consumable Electrode Vacuum Melt (CEVM or VAR). This process helps to remove impurities and minimize segregation.
The stainless-steel grade material usually comes in the annealed condition (Condition A) and can be heat-treated to achieve high strength and hardness. Among other impressive qualities embedded in this alloy are machinability, formability, and weldability, all of which ease the fabrication process of various intricate parts used in different industries. Its precipitation-hardened qualities result from a fusion of martensitic and ferritic crystalline structures.
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SS 13-8 Mechanical Properties
- Brinell hardness: 430
- Elastic (Young’s, Tensile) Modulus: 203 GPa (29443 ksi)
- Impact strength (V-notched Charpy): 27.0 J (19.9 ft-lb)
- Elongation at break: 12%
- Poisson’s ratio: 0.27 – 0.30
- Tensile strength (Yield proof): 1480 Mpa (215 x 103 psi)
- Tensile strength (Ultimate UTS): 1620 MPa (235 x 103 psi)
- Rockwell C hardness: 45
- Reduction of area: 45%
- Fatigue strength (H950): 130 ksi
- Shear modulus (H950): 11 x 103 ksi
- Shear strength (H950): 150 ksi
- Specific gravity: 7.76
SS 13-8 Chemical Properties
Element | min | max |
Carbon | 0 | 0.05 |
Manganese | 0 | 0.1 |
Silicon | 0 | 0.1 |
Phosphorus | 0 | 0.01 |
Sulfur | 0 | 0.008 |
Chromium | 12.25 | 13.25 |
Nickel | 7.5 | 8.5 |
Iron | – | 76 |
Aluminum | 0.9 | 1.35 |
Molybdenum | 2 | 2.5 |
Nitrogen | 0 | 0.01 |
SS 13-8 Thermal Properties
- Thermal expansion coefficient at 69.8 – 203 °F (21 – 95 °C): 5.89 µin/in°F (10.6 µm/m⋅°C)
- Thermal conductivity (in condition A, @100°C/212°F): 97.2 BTU in/hr.ft².°F (14.0 W/mK)
- Specific heat capacity: 1.1 x 10^-1 BTU/lb-°F
- Melting point: 2,560 – 2,680 °F ( 1404 – 1471 °C)
SS 13-8 Electric properties
- Electrical conductivity: 2.3% IACS
- Electrical resistivity: 1.02 x 10-6 Ωm
SS 13-8 Other Properties
- Density: 0.284 lb/in3
SS 13-8 Fabrication and Working Instructions
Stainless Steel Grade 13-8 PH steel may be worked in diverse ways, including cold working, hot working, forging, machining, and cold cutting. Cold working, also known as cold rolling or cold forming, is used to increase the strength and surface quality of this material, as well as its dimensional accuracy. It also decreases its ductility. Rollers are used in this process to introduce dislocations into the material’s crystal structures. The amount of cold working required depends on the steel’s initial condition and the desired properties of the final product.
Hot working, as opposed to cold working, employs heat to strengthen the steel. It is initially treated for four hours in a solution at 950°F to 1,150°F (510°C to 621°C) for 4 hours before being cooled down below 60°F (16°C) until totally martensitic. The solution improves the hardening process. In the case of forging, the material is uniformly heated at 2150 – 2200 °F (1176 – 1204 °C) for one hour. The steel can then be air-cooled to 60 °F (15 °C) before further processing. Before it hardens, it must be treated in a solution.
SS 13-8 is highly machinable in solution-treated and age-hardened conditions. The annealing process improves the surface finish and shelf-life of tools made from this metal, especially when machined at rates 20% to 30% slower than those used for steel 302 and 304. For improved machinability, use the two-step heating method (condition H), which involves heating the steel at 1425 °F (773 °C) for 2 hours and allowing it to air-cool. Afterwards, heat it at 1165 °F (629 °C) for 4 hours before air-cooling it.
Cold cutting SS 13-8 bars and forgings using a saw is superior to using an abrasive wheel, as the latter may cause cracking. This is true for steel materials that have been annealed.
SS 13-8 Heat Treatment
PH 13-8 is suitable to handle under different conditions. Condition A, commonly referred to as annealing, entails soaking the material at 1700 °F (927 °C) and cooling it below 60 °F (16 °C) for one hour. The annealed material can then undergo cold treatment by subjecting it to -100 °F (-73 °C) and allowing it to air-warm to room temperature. Thereafter, it is heated to 950 °F (510 °C) for four hours before being left to air-cool. This works in condition RH 950.
For conditions H1000, H950, H1150, H1050, and H950, soak the steel in a solution for four hours at the required temperature and cool it in the air. If handling condition H1150M material, treat it in a solution at 1400 °F (760 °C) and let it air-cool. Afterwards, re-heat the material to 1150 °F (620 °C), before leaving it to cool in the air.
What is Steel AMS 5629 (SS 13-8)?
AMS 5629 (SS 13-8) is a PH 13-8 (UNS S13800) stainless-steel grade that has been heat treated at a low temperature to provide superior strength. The martensitic precipitation-hardening alloy exhibits excellent properties such as transverse toughness, hardness, and stress corrosion cracking resistance, which makes it useful in manufacturing structural components such as valves, shafts, and gears.
Chemical Composition of AMS 5629 (SS 13-8)
The steel variant is a composition of 0.05 carbon (C), 0.10 manganese (Mn), 0.010 phosphorus (P), 0.008 sulfur (S), 0.10 silicon (Si), 13.25 chromium (Cr) max, 8.5 nickel (Ni) max, 2.50 molybdenum (Mo) max, 1.35 aluminium (Al) max, and 0.01 nitrogen (N).
Applications of AMS 5629 (SS 13-8)
AMS 5629 is often utilized to make parts that require high strength, toughness, and resistance to wear and corrosion. These include:
- Pump shafts and impellers
- Springs and fasteners, such as bolts, nuts, and screws
- Bearings and bushings
- Valves and fittings
- Medical devices and surgical instruments
- Electrical connectors and contacts
- Heat exchanger components, such as baffles and tubes
These components are typically found in the medical, oil and gas, defence, aerospace, and automotive industries.
AMS 5629 (SS 13-8) BAR
Our AMS 5629 (SS 13-8) bar is manufactured in-house, using cutting-edge heat treatment processes to ensure precise hardness, high tensile strength, and excellent formability, all of which are guaranteed to ensure the success of your next project. We source the raw materials from trusted steel suppliers to ensure quality and competitive pricing. If you have any questions or wish to place an order, feel free to contact us.
AMS 5629 (SS 13-8) FORGING
Friend Metals SS Supplier also offer AMS 5629 (SS 13-8) forging service. These austenitic, aerospace-grade steel products exhibit superior toughness and workability that meet your custom requirements and provide durability. They are highly resistant to impact, wear and tear, and corrosion, which make them suitable for various applications in the automotive, aircraft and ship, agriculture machinery, oil and gas, hardware, and general industries.
Whether you need a component or an entire assembly, we have you covered. Our production processes include both hot and cold forgings to ensure precise tolerances and high quality. We also take the shipping burden off your shoulders, using premium packaging materials for safe and speedy delivery. Contact us today and learn how we can be of service to you.