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Poor hardness of the expansion jointed heat exchange tubes

2019-08-20View Original

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6.6.1.3 of 151 states that \"the hardness of the heat exchange tube material should be lower than that of the tube sheet.\" ”But it does not specify by how much the hardness should differ. The engineer from the Quality Supervision Bureau said that it is generally believed in the industry that it should be HB30, but we only produced products with a hardness of 20. Does anyone know if there are any standards that specify requirements regarding such differences in hardness?

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