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AISI 9840 SAE 9840 SCNM439 Forged Forging Steel Round Bars Hollow Bars Rods Gear Pinion Shafts Square rectangular rectangle Blocks Discs Disks Plates Flat Hex Bars
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We are professional AISI 9840 SAE 9840 SCNM439 Forged Forging Steel Round Bars Hollow Bars Rods Gear Pinion Shafts Square rectangular rectangle Blocks Discs Disks Plates Flat Hex Bars from china
APPLICATIONS
This alloy is suited to production of highly stressed components of large cross section for aircraft, automotive and general engineering applications, such as forged propeller shafts, connecting rods, gear shafts, crankshafts and landing gear components.
Forging
This alloy would be forged between 2150 and 1700ºF (1175 and 925ºC.)
Heat Treatment
Annealing: Austenitize at 1525ºF (830ºC) and slow cool from 1280 to 1200ºF (iso anneal) to give coarse pearlite structure for optimum machinability.
Normalizing: At 1600ºF (870ºC) followed by air cool.
Hardening: from 1525-1575ºF (830-860ºC) and oil quench for thin, intricate shapes, water quench for large, simple shapes.
Tempering: from 1000-1250ºF(540-680ºC) as per required properties.
Machinability: this alloy may be readily machined, preferably from a coarse pearlitic structure.
Weldability: pre-heat and post-weld stress relief are recommended for welding of this alloy. Welding should not be carried out in the hardened and tempered condition.
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