249M-02 锅炉、过热器、热交换器及冷凝器管用奥氏体焊接钢管标准
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壁厚 Thickness 外径 mm |
0.51 |
0.64 |
0.81 |
0.89 |
1.24 |
1.65 |
2.11 |
2.77 |
3.40 |
3.78 |
4.19 |
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19.1 |
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25.4 |
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31.8 |
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38.1 |
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50.8 |
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63.5 |
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76.2 |
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88.9 |
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101.6 |
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114.3 |
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ASTM A249标准规定的外径偏差 THE TOLERANCE OF ASTM A249 STANDARO OUTER DIAMETER |
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外径 O.D |
允许偏差 Tolerance Allowed |
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＜25, |
+0.10，-0.11 |
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≥25.4, ≤40 |
+0.15 |
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＞40，＜50 |
+0.20 |
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＞50，＜65 |
+0.25 |
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＞65，＜75 |
+0.30 |
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＞75，≤100 |
+0.38 |
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＞100，≤200 |
+0.38，-0.64 |
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ASTM A249标准规定的厚壁偏差为+10%壁厚 ASTM A249 STANDARO WALL THICKNESS TOLERANCE IS +10% |
