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发表于 2018-6-11 12:16:02
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本帖最后由 lyklzy 于 2018-6-11 12:20 编辑
1) ASME B16.5-2017 Pipe Flanges and Flanged Fittings NPS ½ Through NPS 24 Metric/Inch Standard
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5 MATERIALS
5.1 General
(a) Materials required for flanges and flanged fittings are listed in Table 1A with the following restrictions:
(1) Plate and flat bar materials may be used only for blind flanges and reducig flanges without hubs.
(2) Flanges and flanged fittings shall be manufactured as one piece in accordance with the applicable material specification. Assembly of multiple pieces into the
finished product by welding or other means is not permitted by this Standard.
(b) Each forged flange shall be finished from apart that is brought as nearly as practicable to the finished shape and size by a compressive plastic hot-working operation
that consolidates the material to produce an essentially wrought structure, and shall be so processed during the operation as to cause metal flow in the direction
most favorable for resisting the stress encountered in service.
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2) ASME B16.47-2017 Large Diameter Steel Flanges NPS 26 Through NPS 60 Metric/Inch Standard
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5 MATERIALS
5.1 General
(a) Materials required for flanges are listed in Table 1 with the restriction that plate materials shall be used only for blind flanges. Flanges shall be manufactured as one
piece in accordance with the applicable material specification. Assembly of multiple pieces into the finish product by welding or other means is not permitted by this Standard.
(b) Each forged flange shall be finished from a part that is brought as nearly as practicable to the finished shape and size by a compressive plastic hot working operation
that consolidates the material to produce an essentially wrought structure, and shall be so processed during the operation as to cause metal flow in the direction
most favorable for resisting the stresses encountered in service.
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