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Steel for high strength bolt excellent in delayed fracture resistance and bolt formability and method for manufacturing bolt
Steel for high strength bolt excellent in delayed fracture resistance and bolt formability and method for manufacturing bolt
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机译：耐延迟断裂性和螺栓成形性优异的高强度螺栓用钢及其制造方法
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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 C ˆ’ 0.07 × Mo + 0.20 × V ‰¤ 0.20
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机译：提供一种用于高强度螺栓的钢，该钢在恶劣的环境下可以表现出足够的耐延迟断裂性，并且还具有优异的螺栓成形性。本发明的高强度螺栓用钢的C：0.10〜0.30％，C：0.10〜0.30％。 Ni：0.4〜0.7％，化学成分适当调整，满足下式（1）和（2）：0.85‰C + Si / 7 + Mn / 5 + Ni / 20 + Cr / 9 + Mo / 2‰1.3 C≤0.07×Mo + 0.20×V‰0.20
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