API 6A F5
Alloy SteelAPI 6A F5
API 6A wellhead & christmas-tree steel grade F5.
Chemical Composition (%)
| C | 0.05 |
|---|---|
| CR | 0 |
| NI | 0 |
| MO | 0 |
| P | 0.025 |
| S | 0.02 |
Applications
International high-end steel grade for aerospace, oil & gas, defense or engineering machinery.
Available Forms
Bar, plate, sheet, tube, forgings, strip, wire, powder
Uses
Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Chromium (≈6.5%) improves hardenability, wear and corrosion resistance. Molybdenum (≈0.6%) raises high-temperature strength and prevents temper embrittlement. Nickel (≈4%) increases toughness and impact strength at low temperature. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.
Heat Treatment
Typically normalized (880–920 °C, air cool) or carburized (900–930 °C) for case-hardening grades, then quenched and tempered at 150–200 °C.
Precautions
Weldable with standard procedures; preheat may be needed for thick sections or higher-carbon/ alloy grades. Protect from decarburization during heating (controlled atmosphere or protective coating).
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