发明名称 |
Depression-provided steel pipe and composite pile |
摘要 |
This depression-provided steel pipe has plural depressions on an outer peripheral surface, the depressions being formed so as to form a line along an axial direction of the steel pipe, in which each of the depressed portions has, inside thereof, a columnar groove portion extending along the axial direction of the steel pipe and depressed deeper than a bottom surface of these depressed portions; 0.95≦HA/HB≦1.05 is satisfied, where HA is an average Vickers hardness in each of the depressed portions, and HB is a Vickers hardness at a portion between the depressed portions adjacent to each other in the axial direction of the steel pipe; and the outer peripheral surface is covered with a mill scale. |
申请公布号 |
US9062432(B2) |
申请公布日期 |
2015.06.23 |
申请号 |
US201213981415 |
申请日期 |
2012.02.22 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
Takagi Masahide;Taenaka Shinji;Satoh Tetsu;Motegi Yuki;Oosawa Takashi |
分类号 |
E02D5/28;B21C37/15;B21D15/00;B21D17/02 |
主分类号 |
E02D5/28 |
代理机构 |
Kenyon & Kenyon LLP |
代理人 |
Kenyon & Kenyon LLP |
主权项 |
1. A depression-provided steel pipe having plural depressions on an outer peripheral surface , the depressions being formed so as to form a line along an axial direction of the steel pipe, wherein each of the depressed portions has, inside thereof, a columnar groove portion extending along the axial direction of the steel pipe and depressed deeper than a bottom surface of these depressed portions; 0.95 <HA/HB <1.05 is satisfied, where HA is an average Vickers hardness in each of the depressed portions, and HB is a Vickers hardness at a portion between the depressed portions adjacent to each other in the axial direction of the steel pipe; and the outer peripheral surface is covered with a mill scale. |
地址 |
Tokyo JP |