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SME MF920139
- New Steel For Lighter, Liability-Free Components
- standard by Society of Manufacturing Engineers, 06/01/1992
- Publisher: SME
$9.00$18.00
A NEW MICROALLOYED, MULTIPHASE, LOW-CARBON STEEL HAS BEEN DEVELOPED AS AN ALTERNATIVE TO THE QT STEELS TRADITIONALLY USED IN THE FABRICATION OF HIGH-STRENGTH COLD- FORGED PRODUCTS. THE BENEFITS OF THIS NEW STEEL INCLUDE: (1) THE ELIMINATION OF SPHEROIDIZE ANNEALING PRIOR TO COLD FORMING; (2) THE ELIMINATION OF THE QT HEAT TREATMENT AFTER THE DEFORMATION, AND (3) THE ABILITY TO ACHIEVE IN THE FINAL COMPONENT YIELD STRENGTHS OF DESIRED LEVELS, HIGH-FATIGUE RESISTANCE AND VERY HIGH-NOTCH TOUGHNESS. THE EXCELLENT PROPERTIES EXHIBITED BY THIS STEEL ARE A DIRECT RESULT OF THE ADVANCED THERMOMECHANICAL OR CONTROLLED PROCESSING OF THE AUSTENITE DURING BAR AND/OR ROD ROLLING. THIS PAPER WILL FIRST BRIEFLY REVIEW THE PHYSICAL METALLURGY OF THIS STEEL AS IT PERTAINS TO COLD FORMING. THIS WILL BE FOLLOWED BY A REVIEW OF INDUSTRIAL TRIALS WHERE VARIOUS COMPONENTS HAVE BEEN COLD FORGED FROM THIS STEE