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BEARING STEEL EXHIBITING EXCELLENT MACHINABILITY AFTER SPHEROIDIZING ANNEALING AND EXCELLENT RESISTANCE TO HYDROGEN FATIGUE AFTER QUENCHING/TEMPERING
BEARING STEEL EXHIBITING EXCELLENT MACHINABILITY AFTER SPHEROIDIZING ANNEALING AND EXCELLENT RESISTANCE TO HYDROGEN FATIGUE AFTER QUENCHING/TEMPERING
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机译:淬火/回火后进行渗碳退火后表现出出色的可加工性以及出色的抗氢疲劳性
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摘要
Provided is a bearing steel that exhibits excellent machinability after spheroidizing annealing and excellent resistance to hydrogen fatigue after quenching/tempering. By using a steel composition containing by mass 0.85 1.10% carbon 0.30 0.80% silicon 0.90 2.00% manganese up to 0.025% phosphorus up to 0.02% sulfur up to 0.05% aluminum 1.8 2.5% chromium 0.15 0.4% molybdenum up to 0.0080% nitrogen and up to 0.0020% oxygen with the remainder comprising iron and unavoidable impurities the formation of WEA is effectively inhibited even in environments in which hydrogen penetrates and rolling fatigue life is thus improved. Machinability properties such as cutting and forging performance are also improved.
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