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ALLOY STEEL
4140 Chromium-Molybdenum Steel
Oil-hardening chromium-molybdenum steel has good strength and wear resistance, excellent toughness and ductility with the ability to resist stress and creep at prolonged high temperatures (up to 1000º F). Also available in leaded grades that have greatly improved machinability, but should not be used in applications over 400º F.
Elevated temperatures cause lower ductility in leaded grades.
Applications: Drill collars, high temperature bolts, sprockets, kelly bars, reamer bodies, rotary table shafting, oil well tool joints, spindles, stay bolts, tractor axles, tractor arms, axle shafts, valves, bolts, subs, couplings, trailer axles, winch shafts, piston rods, rams, hydraulic machinery shafts, precision lead screws, chain links, zinc die-casting dies.
Analysis: C - .38/.43 Max. Mn - .75/1.00 P - .035 Max. S - .04 Max.
Si - .15/.35 Cr - .80/1.10 Mo - .15/.25
Mechanical Properties: Annealed
Tensile Strength (psi) 140,000
Yield Point (psi) 90,000
Elongation (% in 2”) 20
Reduction of Area (%) 45
Brinell Hardness 285
Weldability: Difficult but can be welded by any of the common welding processes
providing section is preheated and stress relieved after welding. Grade of welding
rod used depends on welding conditions such as thickness of section, design, service
requirements, etc. When welding leaded material, adequate ventilation should be
provided to prevent accumulation of fumes. Forging: Excellent forge stock due to
self-scaling characteristics. Forge at 2100º F - 2200º F.
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