5140 Alloy Steel
Chromium alloy steel, good hardenability and wear resistance for medium-strength shafts and components.
Chemical Composition
| Element | Percentage (% by weight) |
|---|---|
| Fe | 97.395 - 98.07 (balance) |
| Mn | 0.7 - 0.9 |
| Cr | 0.7 - 0.9 |
| C | 0.38 - 0.43 |
| Si | 0.15 - 0.3 |
| S | max 0.04 |
| P | max 0.035 |
Mechanical Properties
- Tensile strength (MPa)
- 570
- Yield strength (MPa)
- 295
- Hardness (HB)
- 167
Thermal Properties
- Thermal conductivity (W/m·K)
- 44.6
Also known as
Direct equivalents
Same material sold under a different naming standard.
Typical Applications
- Shafts
- Bolts
- Studs
- Machinery components needing medium strength
Buying This Grade in Pakistan
A through-hardening chromium steel for shafts and fasteners, sold into the same Lahore and Karachi forging and machining shops as the other alloy grades, positioned as a mid-strength option between plain carbon steel and the nickel-chromium-molybdenum grades.
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.
Grade Family
Chromium alloy steel
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