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板材最小弯曲半径 mm |
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标准JB/T 5000.3—1998规定：对于低合金钢 r≥25δ；对于低碳钢 r≥20δ |
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材 料 |
回 火 或 正 火 |
淬 火 |
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弯 曲 半 径 r |
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垂直于轧制纹路 |
平行于轧制纹路 |
垂直于轧制纹路 |
平行于轧制纹路 |
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工业纯铁 |
0 |
0.2δ |
0.2δ |
0.5δ |
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铝 |
0.3δ |
0.8δ |
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黄铜 |
0.4δ |
0.8δ |
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铜 |
1.0δ |
2.0δ |
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10，Q195，Q215， |
0 |
0.4δ |
0.4δ |
0.8δ |
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15，20，Q235， |
0.1δ |
0.5δ |
0.5δ |
1.0δ |
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25，30，Q255， |
0.2δ |
0.6δ |
0.6δ |
1.2δ |
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35，40，Q275， |
0.3δ |
0.8δ |
0.8δ |
1.5δ |
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45，50， |
0.5δ |
1.0δ |
1.0δ |
1.7δ |
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55，60， |
0.7δ |
1.3δ |
1.3δ |
2.0δ |
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硬铝 |
1.0δ |
1.5δ |
1.5δ |
2.5δ |
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超硬铝 |
2.0δ |
3.0δ |
3.0δ |
4.0δ |
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δ |
1 |
1.5 |
2 |
3 |
4 |
5 |
6 |
8 |
10 |
|
r |
K |
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1 |
0.350 |
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2 |
0.375 |
0.357 |
0.350 |
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3 |
0.398 |
0.375 |
0.362 |
0.350 |
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4 |
0.415 |
0.391 |
0.374 |
0.360 |
0.350 |
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5 |
0.428 |
0.404 |
0.386 |
0.367 |
0.357 |
0.350 |
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6 |
0.440 |
0.415 |
0.398 |
0.375 |
0.363 |
0.355 |
0.350 |
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7 |
0.450 |
0.425 |
0.407 |
0.383 |
0.369 |
0.360 |
0.354 |
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|
8 |
0.459 |
0.433 |
0.415 |
0.391 |
0.375 |
0.365 |
0.356 |
0.350 |
|
|
9 |
0.465 |
0.440 |
0.423 |
0.398 |
0.381 |
0.370 |
0.362 |
0.353 |
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10 |
0.470 |
0.447 |
0.429 |
0.405 |
0.387 |
0.375 |
0.366 |
0.356 |
0.350 |
|
12 |
0.480 |
0.459 |
0.440 |
0.416 |
0.399 |
0.385 |
0.375 |
0.362 |
0.355 |
|
14 |
|
0.467 |
0.450 |
0.425 |
0.408 |
0.395 |
0.385 |
0.369 |
0.360 |
|
16 |
|
0.473 |
0.459 |
0.433 |
0.416 |
0.403 |
0.392 |
0.375 |
0.365 |
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18 |
|
0.479 |
0.465 |
0.440 |
0.423 |
0.409 |
0.400 |
0.382 |
0.370 |
|
20 |
0.50 |
|
0.470 |
0.447 |
0.430 |
0.415 |
0.405 |
0.388 |
0.375 |
|
22 |
|
|
0.475 |
0.453 |
0.435 |
0.421 |
0.410 |
0.394 |
0.380 |
|
25 |
|
0.5 |
|
0.460 |
0.443 |
0.430 |
0.417 |
0.402 |
0.387 |
|
28 |
|
|
0.5 |
0.466 |
0.450 |
0.436 |
0.425 |
0.408 |
0.395 |
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30 |
|
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|
0.470 |
0.455 |
0.440 |
0.430 |
0.412 |
0.400 |
