8620 Alloy Steel

Chemical Composition

Physical Properties

Density (kg/m³)

7850

Mechanical Properties

Tensile strength (MPa)

530

Yield strength (MPa)

385

Hardness (HB)

149

Thermal Properties

Thermal conductivity (W/m·K)

46.6

Also known as

Typical Applications

• Gears
• Camshafts
• Transmission parts requiring a carburized case

Buying This Grade in Pakistan

The standard case-hardening grade for gears and transmission parts among PAAPAM member forging companies, carburizing services are already available locally at several Lahore and Karachi forge shops, so this grade pairs naturally with that existing capability.

Related reading

• Sourcing steel for auto parts forging: a PAAPAM supplier's grade checklist

  A practical grade-selection checklist for Pakistani auto parts forging shops, built around what PAAPAM-member companies actually forge and heat treat.

• Gear and shaft steel for Pakistan's forging sector: 4140, 8620, and 5140 side by side

  Three alloy steel grades cover most of the gear and shaft work in Pakistan's forging sector. Here's how to tell which one a given part actually needs.

• 8620 vs 8640: case-hardening vs through-hardening, which one and why

  The difference between 8620 and 8640 alloy steel comes down to one question: does the part need a hard case over a tough core, or uniform hardness throughout?

• 4140 alloy steel: the forging industry's workhorse, explained

  Why 4140 shows up in nearly every Pakistani auto parts forging shop, and what its composition actually gives you.