1. Key Properties:
High Strength: SAE 8630 is a low-alloy steel with excellent strength and toughness properties, ideal for use in applications that require both high strength and good impact resistance.
Good Hardenability: SAE 8630 can be heat treated to improve its hardness and surface wear resistance, making it suitable for parts that undergo high stress and wear.
Good Toughness: Exhibits excellent toughness and impact resistance, ensuring durability in high-stress and shock-loading conditions.
Weldability: SAE 8630 has good weldability, though preheating and post-weld heat treatment may be required for thicker sections to prevent cracking and ensure optimal results.
Corrosion Resistance: Offers moderate resistance to corrosion, which can be enhanced by coatings or surface treatments in harsh environments.
Machinability: It offers good machinability in the as-rolled condition, allowing for efficient manufacturing and processing.
2. Applications/Industries:
Automotive: SAE 8630 is widely used in automotive manufacturing, particularly for high-strength parts such as gears, shafts, and crankshafts, as well as other drivetrain components exposed to dynamic stresses.
Heavy Machinery: Commonly used for components such as gears, shafts, and pressure vessels in heavy machinery, mining, and construction equipment where strength, toughness, and wear resistance are essential.
Oil & Gas: Utilized in the oil and gas industry for producing durable components like pump shafts, valves, and drill bits, which are subjected to high pressure and harsh operational environments.
Aerospace: SAE 8630 is used in aerospace applications requiring high strength and toughness, including landing gears, turbine engine components, and structural parts.
Military: Employed in military applications for producing high-strength parts that require both impact resistance and durability, such as armored vehicle components and weapons systems.
3. Certifications/Standards:
SAE J403: SAE 8630 conforms to the SAE J403 standard for alloy steels, ensuring it meets the required chemical composition and mechanical properties.
ASTM A519: This standard applies to seamless carbon and alloy steel mechanical tubing, which is relevant for SAE 8630 seamless pipes.
ISO 9001: Quality management system certification.
4. Chemical Composition:
Carbon (C): 0.28% – 0.33%
Manganese (Mn): 0.60% – 0.90%
Chromium (Cr): 0.70% – 1.00%
Nickel (Ni): 1.50% – 2.00%
Molybdenum (Mo): 0.20% – 0.30%
Silicon (Si): 0.20% – 0.35%
Phosphorus (P): 0.035% max
Sulfur (S): 0.035% max
Iron (Fe): Balance
5. Technical Specifications:
Yield Strength:
SAE 8630: 450 MPa (minimum)
Tensile Strength:
SAE 8630: 655–850 MPa
Hardness:
SAE 8630: Approximately 200–250 HB (Brinell hardness) in the as-rolled condition. After heat treatment (carburizing or quenching), surface hardness can reach up to 58–60 HRC.