AISI 8630

Low Alloy Steel

AISI 8630 is a low-alloy steel known for its strength, toughness, and good hardenability. It contains approximately 0.28-0.34% carbon, along with 0.70-0.90% manganese, 0.40-0.60% chromium, and 0.80-1.10% nickel. These elements enhance its mechanical properties, making it suitable for applications requiring high strength and resistance to wear, such as gears, shafts, and heavy machinery components. AISI 8630 can be heat-treated to achieve desired hardness levels, and it offers good weldability. Its balance of toughness and strength makes it a popular choice in the automotive, aerospace, and industrial sectors.

The grade has poor through hardenability to a depth dependent on the chemical composition, and it is critical that the hardenability of the grade must be taken into account when designing and selecting it for specific equipment.

Impact toughness is generally good to temperatures as low as -46°C with typically 27J average and 20J single achieved, this is limited though dependent on a number of factors such as ruling section, chemical composition and heat treatment condition, with impact toughness achieved decreasing with higher strength, ruling section and at lower test temperatures due to the materials Ductile / Brittle transition temperature.

Minimum hardness is based on API 6A requirements. Maximum hardness shown is based on compliance with NACE MR0175 / ISO 15156

Is typically used in oil patch applications for connectors, hangers and block valves.