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STEEL FOR HIGH-STRENGTH BOLTS WHICH HAS EXCELLENT DELAYED FRACTURE RESISTANCE AND BOLT FORMABILITY, AND BOLT
STEEL FOR HIGH-STRENGTH BOLTS WHICH HAS EXCELLENT DELAYED FRACTURE RESISTANCE AND BOLT FORMABILITY, AND BOLT
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机译:具有出色的延迟断裂抗性和螺栓成形性的高强度螺栓用钢,以及螺栓
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摘要
To provide a steel for high-strength bolts, which can exhibit the sufficient delayed fracture resistance under the severe environment, and also has excellent bolt formability. The steel for high-strength bolts of the present invention includes C: 0.10 to 0.30%; and Ni: 0.4 to 0.7%, with the chemical composition being appropriately adjust, and satisfies the following formulas (1) and (2):; 0.85≦[C]+[Si]/7+[Mn]/5+[Ni]/20+[Cr]/9+[Mo]/2≦1.3 (1); [C]−(0.07×[Mo]+0.20×[V])≦0.20 (2)
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