When the S-bend is pure bending, the tensile stress of the outer arm wall of the middle layer is reduced by the action of the external force distance m, and the internal compressive stress. The resultant force N1 and N2 make the cross section of the pipe change. Based on this factor, RX and SX are the main reasons for the decline of bend quality. Therefore, in gbj235-82, the RX value under various pressure levels and the thinning amount on the outside are clearly specified in order to control the RX and SX values and ensure the quality.
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