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发明授权
CN107709594B 螺栓 有权

螺栓
摘要：
提供具有高强度，并且具有优异的耐氢脆化特性的螺栓。本发明的实施方式的螺栓具有如下的化学组成：以质量％计，含有C：0.32～0.39％、Si：0.15％以下、Mn：0.40～0.65％、P：0.020％以下、S：0.020％以下、Cr：0.85～1.25％、Al：0.005～0.060％、Ti：0.010～0.050％、B：0.0010～0.0030％、N：0.0015～0.0080％、O：0.0015％以下、Mo：0～0.05％、V：0～0.05％、和Cu：0～0.50％、Ni：0～0.30％、以及Nb：0～0.05％，余量由Fe和杂质组成，满足式(1)和式(2)；所述螺栓具有1000～1300MPa的拉伸强度，且满足式(3)。4.9≤10C+Si+2Mn+Cr+4Mo+5V≤6.1 (1) Mn/Cr≤0.55 (2) [固溶Cr]/Cr≥0.70 (3)
摘要（英）：

A bolt is provided that has high strength and excellent hydrogen embrittlement resistance characteristics. A bolt according to an embodiment of the present invention consists of, in mass%, C: 0.32 to 0.39%, Si: 0.15% or less, Mn: 0.40 to 0.65%, P: 0.020% or less, S: 0.020% or less, Cr: 0.85 to 1.25%, Al: 0.005 to 0.060%, Ti: 0.010 to 0.050%, B: 0.0010 to 0.0030%, N: 0.0015 to 0.0080%, O: 0.0015% or less, Mo: 0 to 0.05%, V: 0 to 0.05%, Cu: 0 to 0.50%, Ni: 0 to 0.30%, and Nb: 0 to 0.05%, with the balance being Fe and impurities. The bolt satisfies Formula (1) and Formula (2), and has a tensile strength of 1000 to 1300 MPa and satisfies Formula (3). 4.9 ‰¤ 10 C + Si + 2 Mn + Cr + 4 Mo + 5 V ‰¤ 6.1 Mn / Cr ‰¤ 0.55 dissolved Cr / Cr ‰¥ 0.70

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