PROBLEM TO BE SOLVED: To provide a hollow member having an increased fatigue life by imparting enough corrosion resistance to prevent corrosion pits at a bead cut part on the inner surface of a steel pipe.SOLUTION: A hollow member has a composition comprising, in mass%, C: 0.20%-0.40%, Si: 0.50%-1.5%, Mn: 0.3%-1.5%, Cr: 0.1%-1.6%, P: 0.020% or less, S: 0.010% or less, Cu: 0.1%-0.5%, Ni: 0.1%-0.5%, Nb: 0.02%-0.5%, Ca: 0.005% or less, B: 0.0005%-0.0050%, Al: 0.005%-0.1%, N: 0.010% or less, Ti: 0.02%-0.1% with the balance being Fe and inevitable impurities. Preferably, the hollow member further has at least one selected from V: more than 0 to 0.5% and Mo: more than 0 to 0.5%. The hollow member has a hardness of 450Hv or more. The hollow member is used as a hollow stabilizer.SELECTED DRAWING: None
【課題】鋼管内面のビードカット部の腐食ピットを抑制し得る耐食性を付与することにより、高疲労寿命化させた中空部材の提供。【解決手段】質量%で、C:0.20%〜0.40%、Si:0.50%〜1.5%、Mn:0.3%〜1.5%、Cr:0.1%〜1.6%、P:0.020%以下、S:0.010%以下、Cu:0.1%〜0.5%、Ni:0.1%〜0.5%、Nb:0.02%〜0.5%、Ca:0.005%以下、B:0.0005%〜0.0050%、Al:0.005%〜0.1%、N:0.010%以下、Ti:0.02%〜0.1%を含み、残部がFe及び不可避的不純物からなる組成を有する中空部材。更に、V:0超〜0.5%、Mo:0超〜0.5%から選択される1種以上を含有することが好ましい中空部材。硬さが450Hv以上である、中空部材。中空スタピライサーとして用いる中空部材。【選択図】なし
HOLLOW MEMBER AND METHOD FOR PRODUCING THE SAME
中空部材及びその製造方法
2018-06-21
Patent
Elektronische Ressource
Japanisch
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