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Property
Property
versatile, low-alloy steel
high strength, toughness, wear resistance, and hardenability
ideal for heavy-duty parts in aerospace, automotive, oil & gas, and construction, used for components like gears, shafts, landing gear, and drill bits
responds well to heat treatment for superior hardness and strength
Heat Treating Process
Heat Treating Process
Preparation
Preparation
Ensure the steel is clean and free of contaminants.
For larger blocks, preheating may be needed to avoid thermal shock: Gradually heat to 1250-1300° and equalize.
Quenching
Quenching
Heat the block to 1550-1600°
Soak (hold) at this temperature for 10-30 minutes per inch of thickness to allow uniform transformation to austenite.
Rapid cool the block in oil (preferred for 4140 to minimize cracking; use quenching oil with high flash point). Quench vertically for long pieces to reduce warping.
Cool to room temperature. As-quenched hardness is typically 45-57 HRC.
(Rockwell C: a standard hardness scale for metals, especially steels, measuring resistance to indentation by a diamond cone under a major load, with higher numbers indicating harder, more edge-retention but potentially more brittle material)
Tempering (To refine grain texture)
Tempering (To refine grain texture)
Temper Immediately after quenching or within a short window (often 15-90 minutes)
Reheat to 400-1200° depending on target hardness (lower temps for higher hardness, higher temps for more ductility)
Hold for 1-2 hours per inch of thickness (minimum 2 hours total).
Air cool to room temperature.
Repeat the process can improve properties.
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