API 6A F12

Alloy Steel

API 6A F12

API 6A wellhead & christmas-tree steel grade F12.

Chemical Composition (%)

C0.05
CR0
NI0
MO0
P0.025
S0.02

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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