国外阀门材料常用技术标准 镍合金棒材和线材热轧或冷精轧棒材的长度允许偏差
圆形、方形、六角形及八角形的规 定尺寸与扁条宽度Ain.(mm) |
长度允许偏差,in.(mm) | |||
长度≤12 ft(3658mm) | 长度>12(3658mm)~≤25 ft(7620mm) | |||
上偏差(+) | 下偏差(-) | 上偏差(+) | 下偏差(-) | |
≤2(50.80) | 1/2(12.70) | 0 | 3/4(19.05) | 0 |
>2(50.80)~≤4(101.60) | 3/4(19.05) | 0 | 1(25.40) | 0 |
>4(101.60)~≤6(152.40) | ||||
>6(152.40)~≤9(228.60) | 1(25.40) | 0 | 11/4(31.75) | 0 |
>9(228.60)~≤12(304.80) | 11/4(31.75) | 0 | 11/2(38.10) | 0 |
11/2(38.10) | 0 | 2(50.80) | 0 |
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