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◆标准Standard:
DIN 17175 ---German Standard
ASME SA192,SA106,SA209,SA210,SA213,SA556---Standard of American Society of Mechanical Engineers
GB 5310,3087---Chinese National Standard
Q/BQB 201---Baosteel Corporation Standard
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◆用途Uses:
用于低中压、高压及其以上压力锅炉的水冷壁、省煤器、再热器、过滤器及蒸气管道的制造。
For manufacture of low/medium/high and higher pressure boilers,water cooling panels,coal-saving devices,reheaters,superheaters and steam pipelines
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◆尺寸公差Tolerances on Dimensions:
壁厚允许偏差Wall Thickness Tolerance:
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标准
Standard
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外径
Outside Diameter
da (mm)
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壁厚
Wall Thickness
S (mm)
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壁厚允许偏差
Tolerance
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DIN17175
Q/BQB201
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≤130
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S≤2·Sn
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+15%,-10%
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2·Sn
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+12.5%,-10%
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S>4·Sn
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±9%
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>130
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S≤0.05da
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+15%,-10%
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0.05da
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±12.5%
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S>0.11da
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±10%
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GB3087
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--
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3-20
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+12.5%,-15%
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>20
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±10%
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GB5310
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--
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<3.5
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+15% (最小为+0.48 mm)
-10% (最小为-0.32 mm)
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3.5-20
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+15%,-10%
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>20
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±10%
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ASME SA450
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--
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2.4-3.8
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+35%,-0%
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>3.8-4.6
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+35%,-0%
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>4.6
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+23%,-0%
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ASME SA530
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--
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--
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±12.5%
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