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WIRE ROD FOR USE IN BOLTS THAT HAS EXCELLENT ACID PICKLING PROPERTIES AND RESISTANCE TO DELAYED FRACTURE AFTER QUENCHING AND TEMPERING, AND BOLT
WIRE ROD FOR USE IN BOLTS THAT HAS EXCELLENT ACID PICKLING PROPERTIES AND RESISTANCE TO DELAYED FRACTURE AFTER QUENCHING AND TEMPERING, AND BOLT
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机译:淬火和回火后具有出色的酸洗性和耐延迟断裂性的螺栓用电线杆
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摘要
To provide a wire rod for bolts that has excellent acid pickling properties and the resistance to delayed fracture after quenching and tempering, and a bolt using the same. Disclosed is a wire rod for bolts that has excellent acid pickling properties and resistance to delayed fracture, including, in percent by mass: C: 0.3 to 0.6%; Si: 1.0 to 3.0%; Mn: 0.1 to 1.5%; P: more than 0% and 0.020% or less; S: more than 0% and 0.020% or less; Cr: 0.3 to 1.5%; Al: 0.02 to 0.10%; and N: 0.001 to 0.020%, with the balance being iron and inevitable impurities, wherein in a d× 1/4 position of the wire rod, where d is a diameter of the wire rod, a ferrite area ratio is in a range of 10 to 40%, with the remaining microstructure being bainite, pearlite and an inevitably formed microstructure, and a C content in a position at a depth of 0.1 mm from a surface layer of the wire rod is in a range of 50 to 100% of a C content in a base material.
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