19.自行車用熱軋鋼帶(YB/T5068-1993)
(1)尺寸規(guī)格見表5-268。
表5-268自行車用熱軋鋼帶的尺寸規(guī)格
| 寬度/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 | - | - | - | - | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | × | - | - | - |
| 18l~190 | - | - | - | - | × | × | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - |
| 191~200 | - | - | - | - | × | × | × | × | × | × | × | × | × | × | × | × | × | - | - | - | - | - | - |
| 201~250 | - | - | - | - | × | × | × | × | × | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
(2)允許偏差見表5-269、表5-270。
表5-269自行車用熱軋鋼帶的厚度允許偏差(mm)
| 厚度 | 允許偏差 | |
| 普通精度 | 較高精度 | |
| ≤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自行車用熱軋鋼帶的寬度允許偏差(mm)
| 寬度 | 允許偏差 | |||
| 條狀鋼帶 | 卷狀鋼帶 | |||
| 普通精度 | 較高精度 | 普通精度 | 較高精度 | |
| ≤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)牌號和化學成分見表5-271。
表5-271自行車用熱軋鋼帶的牌號和化學成分
| 牌號 | 化學成分(質量分數)(%) | ||||
| C | Mn | Si | - | - | |
| ≤ | |||||
| 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 |
| 碳素鋼 | 符合GB/T3645的規(guī)定 | ||||
(4)力學和工藝性能見表5-272。
表5-272自行車用熱軋鋼帶的力學和工藝性能
| 牌號 | 厚度/mm | 屈服點ós | 抗拉強度ób | 伸長率δ(%) | 180°冷彎d-彎芯直徑a-厚度 |
| MPa | |||||
| 16Mn | 2~8 | ≥345 | 510~660 | ≥122 | d=2a |
| 19Mn | 2~8 | ≥295 | 460 | ≥22 | d=2a |
| 碳素鋼 | 符合GB/T3645的規(guī)定 | ||||
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