1、Designation: A 787 05Standard Specification forElectric-Resistance-Welded Metallic-Coated Carbon SteelMechanical Tubing1This standard is issued under the fixed designation A 787; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers round, square, rectangular, andspecial shape, electric-resistance-welded mechanica
3、l tubing,either zinc-coated (galvanized) after welding or produced fromaluminum-coated, zinc-coated (galvanized), zinc-iron alloy-coated (galvannealed), or 55 % aluminum-zinc alloy-coatedsteel sheet. Tubing for use as electrical conduit (EMT) orintermediate metallic conduit (IMC) is not covered by t
4、hisspecification.1.2 This specification covers mechanical tubing with out-side diameters or maximum outside dimensions ranging from12 to 8 in. (12.7 to 203.2 mm) and wall thickness from 0.028to 0.134 in. (0.71 to 3.40 mm).1.3 Sizes outside the ranges listed above may be orderedprovided all other req
5、uirements of the specification are met.1.4 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.2. Referenced Documents2.1 ASTM Standards:2A 463/A 463M Specification for Steel Sheet, Aluminum-Coated by the Hot-Dip ProcessA 6
6、53/A 653M Specification for Steel Sheet, Zinc-Coated(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)by the Hot-Dip ProcessA 792/A 792M Specification for Steel Sheet, 55 %Aluminum-Zinc Alloy-Coated by the Hot-Dip ProcessA 924/A 924M Specification for General Requirements forSteel Sheet, Metallic
7、-Coated by the Hot-Dip ProcessB6 Specification for Zinc3. Classification3.1 The types of tubing covered by this specification are:TypeNumberCodeLettersDescription1 AWAC electric-resistance-welded aluminum-coated carbon steel mechanical tubing2 AWG electric-resistance-welded galvanized car-bon steel
8、mechanical tubing3 AWPG electric-resistance-welded carbon steelmechanical tubing, post-hot dipped gal-vanized4 AWGA electric-resistance-welded carbon steelmechanical tubing, zinc-iron alloy-coated (galvannealed)5 AWGZ electric-resistance-welded carbon steelmechanical tubing, 55 % aluminum-zincalloy-
9、coated4. Ordering Information4.1 The ordered wall thickness of the tubing shall be thetotal of the base metal and the metallic coating.4.2 Orders for material under this specification shall in-clude the following:4.2.1 Quantity (feet, metres, or number of lengths),4.2.2 Type, code letters, and descr
10、iption (Sections 1 and 3),4.2.3 Applicable ASTM designation number(s),4.2.4 Coating designation and type of coating,4.2.5 Chemically treated or not chemically treated rawmaterial,4.2.6 Oiled or dry (Section 16),4.2.7 Extra smooth coating (if required),4.2.8 Customer application, including fabricatio
11、n,4.2.9 Flash condition (7.1),4.2.10 Steel grade designation (Sections 5 and 9),4.2.11 Report of chemical analysis if required (Sections 10and 11),4.2.12 Shape (round, square, rectangular, or special),4.2.12.1 Dimensions: roundany two of the following:inside diameter, outside diameter, or wall thick
12、ness; square orrectangularoutside dimension, wall thickness, and cornerradii, if required. (See 12.1 and 13.1 and 13.2.)1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel, and Related Alloys and is the direct responsibility of SubcommitteeA01.09 on Carbon St
13、eel Tubular Products.Current edition approved March 1, 2005. Published March 2005. Originallyapproved in 1981. Last previous edition approved in 2001 as A 787 01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book
14、of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2.13 Length: rou
15、nd tubingmill lengths or definite cutlengths (see 12.2); square and rectangular tubingmill cutlengths and specified length (see 13.4).4.2.14 Squareness of cut: round tubing, if required (see12.3); square and rectangular tubing, if required (see 13.7),4.2.15 Burrs removed, if required (see 15.2),4.2.
16、16 Special packaging (Section 19),4.2.17 Customer specification number, if applicable,4.2.18 Special requirements,4.2.19 Special marking (Section 18), and4.2.20 Recoating of outside diameter weld and heat-affected area, on precoated steel, if required.5. Process5.1 The steel shall be made from any p
17、rocess.5.1.1 If a specific type of melting is required by thepurchaser, it shall be stated on the purchase order.5.1.2 The primary melting may incorporate separate degas-sing or refining and may be followed by secondary melting,using electroslag remelting or vacuum remelting. If secondarymelting is
18、employed, the heat shall be defined as all of theingots remelted from a single primary heat.5.1.3 Steel may be cast in ingots or may be strand cast.When steel of different grades is sequentially strand cast,identification of the resultant transition material is required.The producer shall remove the
19、 transition material by anestablished procedure that positively separates the grades.5.2 For tubing produced from precoated steel sheet, thecomposition of the coating shall comply with the applicablespecification.5.2.1 Specification A 463/A 463MCoating designation foraluminum coated-sheet.5.2.2 Spec
20、ification A 653/A 653MCoating designation forgalvanized and galvannealed steel sheet.5.2.3 Specification A 792/A 792MCoating designation for55 % aluminum-zinc alloy-coated steel sheet.5.2.4 Other grades of coated steel sheet, as listed in Table 1and Table 2, may be used as the precoated material for
21、 the steeltubing upon agreement between the manufacturer and thepurchaser. Such steel sheet shall meet the requirements ofSpecification A 463/A 463M, A 653/A 653M, A 792/A 792M,and A 924/A 924M, except for the chemical requirements.6. Manufacture6.1 Tubes shall be made by the electric-resistance wel
22、dingprocess and shall be made from hot or cold-rolled precoatedsteel.6.2 Special manufacturing practices allow for post-hotdipped galvanizing of welded tubing. If this product is desiredall sections of this specification will apply except Table 3. Wallthickness tolerances shall be determined by agre
23、ement betweenthe producer and purchaser.7. Flash Conditions7.1 The flash conditions under which tubing may befurnished are as follows: The flash shall be removed from theoutside diameter of tubing covered by this specification.Tubing furnished to this specification may have the followingconditions o
24、f welding flash on the inside diameter.7.1.1 Flash-In All tubing in which the inside diameterwelding flash does not exceed the wall thickness or332 in. (2.4mm), whichever is less.7.1.2 Flash Controlled to 0.010 in. (0.254 mm),Maximum Tubing in which the height of the remainingwelding flash is contro
25、lled so as not to exceed 0.010 in. Thiscondition is available in over 0.750 in. (19.05 mm) outsidediameter and gages consistent with Table 4.7.1.3 Flash Controlled to 0.005 in. (0.127 mm),MaximumWhen the inside diameter flash is controlled to0.005 in. (0.127 mm) maximum in tubing produced to outside
26、diameter and wall thickness, inside diameter and wall thick-ness, or outside diameter and inside diameter tolerances, theremaining inside diameter flash, if any, is part of the applicableinside diameter tolerance. This controlled flash is available in0.750 in. (19.05 mm) outside diameter or greater.
27、7.2 Tubes shall be furnished in the following shapes, asspecified by the purchaser: round, square, rectangular, orspecial shapes (as negotiated).7.3 Recoating of the outside diameter weld-heat-affectedarea on precoated steel tubing may be performed at themanufactures option, if not specifically requ
28、ested by thepurchaser.8. Surface Finish8.1 Special surface finishes as may be required for specificapplications shall be provided in the purchase order byagreement between the producer and purchaser.TABLE 1 Chemical Requirements for Low-Carbon SteelsA,BGradeDesignationCComposition, %Carbon Manganese
29、Phos-phorus,maxSulfur,maxMT1010 0.05 to 0.15 0.30 to 0.60 0.035 0.035MT1015 0.10 to 0.20 0.30 to 0.60 0.035 0.035MTX1015 0.10 to 0.20 0.60 to 0.90 0.035 0.035MT1020 0.15 to 0.25 0.30 to 0.60 0.035 0.035MTX1020 0.15 to 0.25 0.70 to 1.00 0.035 0.035ARimmed or capped steels that may be used for the abo
30、ve grades arecharacterized by a lack of uniformity in their chemical composition, and for thisreason product analysis is not technologically appropriate unless misapplication isclearly indicated.BChemistry represents heat analysis. Product analysis, except for rimmed orcapped steel, is to be in acco
31、rdance with usual practice as shown in Table 5.CThe letters MT indicate mechanical tubing.TABLE 2 Chemical Requirements for Other Carbon SteelsAGradeDesigna-tionComposition, %Carbon ManganesePhos-phorus,maxSulfur,max1008 0.10 max 0.50 0.035 0.0351010 0.08 to 0.13 0.30 to 0.60 0.035 0.0351015 0.12 to
32、 0.18 0.30 to 0.60 0.035 0.0351016 0.12 to 0.19 0.60 to 0.90 0.035 0.0351017 0.14 to 0.21 0.30 to 0.60 0.035 0.0351018 0.14 to 0.21 0.60 to 0.90 0.035 0.0351019 0.14 to 0.21 0.70 to 1.00 0.035 0.0351021 0.17 to 0.24 0.60 to 0.90 0.035 0.035AChemistry represents heat analysis. Product analysis, excep
33、t for rimmed orcapped steel, is to be in accordance with usual practice as shown in Table 5.A7870529. Base Metal Chemical Composition9.1 The chemical composition of the sheet steel base metalshall conform to the requirements of Table 1.9.2 Copper-bearing steel, with 0.20 % minimum copper,may be orde
34、red in any of the grades shown in Table 1 or Table2.TABLE 3 Wall Thickness Tolerance for Premetallic Coated As-Welded TubingAOutside Diameter, in.Wall Thickness12 to 1, inclOver 1 to11516 , inclOver 11516 to334 , inclOver 334 to412 , inclOver 412 to6, inclOver 6 to8, inclWall Thickness Tolerance, in
35、., Plus and MinusBWGBin.CPlus Minus Plus Minus Plus Minus Plus Minus Plus Minus Plus Minus22 0.028 0.002 0.006 0.002 0.00620 0.035 0.003 0.006 0.002 0.006 0.002 0.00618 0.049 0.004 0.007 0.003 0.008 0.003 0.00816 0.065 0.005 0.007 0.004 0.008 0.003 0.009 0.003 0.009 0.002 0.01014 0.083 0.006 0.008 0
36、.006 0.008 0.005 0.009 0.005 0.009 0.004 0.010 0.004 0.01013 0.095 0.008 0.010 0.008 0.010 0.007 0.011 0.007 0.011 0.006 0.012 0.006 0.01212 0.109 0.008 0.010 0.008 0.010 0.007 0.011 0.007 0.011 0.006 0.012 0.006 0.01211 0.120 0.009 0.011 0.009 0.011 0.008 0.012 0.008 0.012 0.007 0.013 0.007 0.01310
37、 0.134 0.009 0.011 0.009 0.011 0.008 0.012 0.008 0.012 0.007 0.013 0.007 0.013APost-hot dipped galvanized welded tubing wall thickness tolerances shall be determined by agreement between the producer and purchaser (6.2).BBirmingham Wire Gage.C1 in. = 25.4 mm.TABLE 4 Diameter Tolerances for Metallic-
38、CoatedRound TubingOutside DiameterRange, in.AWall ThicknessTubing withAny Inside FlashConditionFlash-Controlledto 0.005 in.Tubing OnlyBBWGCin.AOutsideD,EDiameter,Plus andMinusInside Diameter,Plus and MinusTolerances, in.F12 to 118 , incl 22 to 16 0.028/0.065 0.0035 0.019Over 118 to 2, incl 22 to 14
39、0.028/0.083 0.005 0.021Over 118 to 2, incl 13 to 10 0.095/0.134 0.005 0.027Over 2 to 212 , inclOver 2 to 212 , incl20 to 1413 to 100.035/0.0830.095/0.1340.0060.0060.0230.029Over 212 to 3, inclOver 212 to 3, incl20 to 1413 to 100.035/0.0830.095/0.1340.0080.0080.0250.031Over 3 to 312 , inclOver 3 to 3
40、12 , incl20 to 1413 to 100.035/0.0830.095/0.1340.0090.0090.0260.032Over 312 to 4, inclOver 312 to 4, incl20 to 1413 to 100.035/0.0830.095/0.1340.0100.0100.0270.033Over 4 to 5, inclOver 4 to 5, incl16 to 1413 to 100.065/0.0830.095/0.1340.0200.0200.0370.043Over 5 to 6, inclOver 5 to 6, incl16 to 1413
41、to 100.065/0.0830.095/0.1340.0200.0200.0370.043Over 6 to 8, incl 14 to 10 0.083/0.134 0.025 0.048A1 in. = 25.4 mm.BFlash controlled to 0.005 in. maximum tubing is produced to outside diameter tolerances and wall thickness tolerances, inside diameter tolerances and wall thicknesstolerances, or outsid
42、e diameter tolerances and inside diameter tolerances, in which the height of the remaining inside welding flash is controlled not to exceed 0.005 in.Any remaining flash is considered to be part of the applicable inside diameter tolerances.CBirmingham Wire Gage.DFlash-in tubing is produced to outside
43、 diameter tolerances and wall thickness tolerances only, and the height of the inside welding flash does not exceed the wallthickness or332 in., whichever is less.EFlash controlled to 0.010 in maximum tubing consists of tubing over58 in. outside diameter which is commonly produced to outside diamete
44、r tolerances and wallthickness tolerances only, in which the height of the remaining inside welding flash is controlled not to exceed 0.010 in.FThe ovality shall be within the above tolerances except when the wall thickness is less than 3 % of the outside diameter, in which cases see 12.5.A7870539.3
45、 An analysis of each heat of steel shall be made by thebasic steel producer to determine the percentage of the ele-ments specified. The heat analysis, as supplied by the steelmelter, shall conform to the requirements of Table 1 or Table 2.9.4 When a grade is ordered under this specification,supplyin
46、g an alloy grade that specifically requires the additionof any element other than those listed for the ordered grade inTable 1 and Table 2 is not permitted.10. Coating Bath Chemical Composition10.1 When tubing is produced from precoated sheet steel,the tubing manufacturer shall furnish, upon request
47、, a reportstating that the tubing has been manufactured from precoatedsheet steel meeting one of the following specifications: A 463/A 463M, A 653/A 653M, A 792/A 792M, and A 924/A 924M.10.2 For post-coated tubing the zinc used for coating shallbe any grade of zinc conforming to Specification B6.11.
48、 Product Analysis11.1 When requested on the purchase order, a productanalysis shall be made by the supplier. The number and sourceof samples for a product analysis shall be based on theindividual heat or lot identity of one of the following forms:11.1.1 Heat Identity MaintainedOne product analysis p
49、erheat shall be made on either the flat-rolled stock or tube.11.1.2 Heat Identity Not MaintainedOne product analysisshall be made from each 2000 ft (610 m) or fraction thereof forsizes over 3 in. (76.2 mm) outside diameter, and from each5000 ft (1524 m) or fraction thereof for sizes 3 in. (76.2 mm)outside diameter and under.11.2 Samples for product spectrochemical analysis shall betaken in accordance with procedures established with the tubeproducer and the testing laboratory. The composition thusdetermined shall correspond to the requirements in T
