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1.1 This specification covers several grades of carbon and low-alloy steel forged or ring-rolled flanges, forged fittings and valves intended primarily for low-temperature service and requiring notch toughness testing. They are made to specified dimensions, or to dimensional standards, such as the ASME and API Specifications referenced in Section 2. Although this specification covers some piping components machined from rolled bar and seamless tubular materials (see 5.3.3), it does not cover raw material produced in these product forms.
1.2 No limitation on size is intended beyond the ability of the manufacturer to obtain the specified requirements. However, Class 3 of Grade LF787 is only available in the quenched-and-precipitation heat treated condition.
1.3 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified by the purchaser in the order.
1.4 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.
1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact quivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A788/A788M Specification for Steel Forgings, General Requirements
A961/A961M Specification for Common Requirements for Steel Flanges, Forged Fittings, Valves, and Parts for Piping Applications
ASME StandardsB 16.10 Face-to-Face and End-to-End Dimensions of Ferrous Valves B 16.11 Forged Steel Fittings, Socket-Welding and Threaded B 16.30 Unfired Pressure Vessel Flange Dimensions B 16.34 Valves-Flanged, Threaded, and Welding End B 16.47 Large Diameter Steel Flanges B 16.5 Steel Pipe Flanges and Flanged Fittings Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Two Park Ave., New York, NY 10016-5990, http://www.asme.org. B 16.9 Factory-Made Wrought Steel Butt-Welding Fittings
ASME Boiler and Pressure Vessel CodeSection IX
AWS StandardsA 5.1 Mild Steel Covered Arc-Welding Electrodes Available from American Welding Society (AWS), 550 NW LeJeune Rd., Miami, FL 33126, http://www.aws.org. A 5.5 Low-Alloy Steel Covered Arc-Welding Electrodes
API Standards600 Steel Gate Valves with Flanged or Butt-Welding Ends 602 Compact Design Carbon Steel Gate Valves for Refinery Use 605 Large Diameter Carbon Steel Flanges
ICS Number Code 23.040.40 (Metal fittings)
UNSPSC Code 31132100(Steel forgings)
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ASTM A350 / A350M-11, Standard Specification for Carbon and Low-Alloy Steel Forgings, Requiring Notch Toughness Testing for Piping Components, ASTM International, West Conshohocken, PA, 2011, www.astm.orgBack to Top