收藏词条 编辑词条 自行车用热轧钢带(YB/T5068-11993)
(1)尺寸规格见表5-268。
表5-268自行车用热轧钢带的尺寸规格
宽度/mm |
厚度/mm |
||||||||||||||||||||||
2 |
2.25 |
2.5 |
2.75 |
3 |
3.25 |
3.5 |
3.75 |
4 |
4.25 |
4.5 |
4.75 |
5 |
5.75 |
6.00 |
6.25 |
6.5 |
6.75 |
7 |
7.25 |
7.5 |
7.75 |
8 |
|
60~70 |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
71~80 |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
81~90 |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
91~100 |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
101~110 |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
111~120 |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
121~130 |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
131~140 |
|
|
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
141~150 |
|
|
|
|
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
151~160 |
|
|
|
|
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
|
161~170 |
|
|
|
|
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
|
|
|
171~180 |
|
|
|
|
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
|
|
|
|
|
|
|
|
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
|
|
|
|
|
|
191~200 |
|
|
|
|
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
× |
|
|
|
|
|
|
201~250 |
|
|
|
|
× |
× |
× |
× |
× |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(2)允许偏差见表5-269、表5-270。
表5-269自行车用热轧钢带的厚度允许偏差(mm)
厚度 |
允许偏差 |
|
普通精度 |
较高精度 |
|
≤2.5 |
±O.17 |
±0.15 |
>2.5~3.0 |
±0.19 |
±O.17 |
>3.0~4.0 |
±O.22 |
±O.20 |
>4.O |
±O.25 |
±O.22 |
表5-270自行车用热轧钢带的宽度允许偏差(mm)
宽度 |
允许偏差 |
|||
条状钢带 |
卷状钢带 |
|||
普通精度 |
较高精度 |
普通精度 |
较高精度 |
|
≤100 |
±1.0 |
+1.O -0.8 |
±2.O |
士1.5 |
>100~150 |
±1.2 |
+1.2 -1.O |
||
>150~250 |
±1.5 |
+1.5 -1.3 |
(3)牌号和化学成分见表5-271。
表5-271自行车用热轧钢带的牌号和化学成分
牌号 |
化学成分(质量分数)(%) |
||||
C |
Mn |
Si |
S |
P |
|
≤ |
|||||
16Mn |
O.12~0.20 |
1.20~1.60 |
0.20~0.60 |
0.040 |
0.040 |
19Mn |
O.16~0.22 |
0.70~1.00 |
0.20~0.40 |
0.040 |
0.040 |
碳素钢 |
符合GB/T3645的规定 |
(4)力学和工艺性能见表5-272。
表5-272自行车用热轧钢带的力学和工艺性能
牌号 |
厚度 /mm |
屈服点ós |
抗拉强度ób |
伸长率δ (%) |
180°冷弯 d-弯芯直径 a-厚度 |
MPa |
|||||
16Mn |
2~8 |
≥345 |
510~660 |
≥122 |
d= |
19Mn |
2~8 |
≥295 |
460 |
≥22 |
d= |
碳素钢 |
符合GB/T3645的规定 |