1、Designation: A 950/A 950M 99 (Reapproved 2007)Standard Specification forFusion-Bonded Epoxy-Coated Structural Steel H-Piles andSheet Piling1This standard is issued under the fixed designationA 950/A 950M; the number immediately following the designation indicates the yearof original adoption or, in
2、the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers structural steel H-piles andsheet piling with protective
3、fusion-bonded epoxy coatingapplied by the electrostatic spray, flocking, or fluidized bedprocess.NOTE 1The coating applicator is identified throughout this specifica-tion as the manufacturer.1.2 Requirements for coatings are contained in Annex A1.1.3 This specification is applicable for orders in ei
4、therinch-pound units (as Specification A 950) or SI units (asSpecification A 950M). The values stated in either inch-poundor SI units are to be regarded separately as standard. Within thetext, the SI units are shown in brackets.1.4 This standard does not purport to address any of thesafety concerns,
5、 if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A 6/A 6M Specification for General Requireme
6、nts forRolled Structural Steel Bars, Plates, Shapes, and SheetPilingA 36/A 36M Specification for Carbon Structural SteelA 328/A 328M Specification for Steel Sheet PilingA 572/A 572M Specification for High-Strength Low-AlloyColumbium-Vanadium Structural SteelA 588/A 588M Specification for High-Streng
7、th Low-AlloyStructural Steel, up to 50 ksi 345 MPa Minimum YieldPoint, with Atmospheric Corrosion ResistanceA 690/A 690M Specification for High-Strength Low-AlloyNickel, Copper, Phosphorus Steel H-Piles and Sheet Pilingwith Atmospheric Corrosion Resistance for Use in MarineEnvironmentsA 857/A 857M S
8、pecification for Steel Sheet Piling, ColdFormed, Light GageB 117 Practice for Operating Salt Spray (Fog) ApparatusD 2200 Standard Pictorial Surface Preparation Standardsfor Painting Steel SurfacesD 3451 Guide for Testing Coating Powders and PowderCoatingsG 8 Test Methods for Cathodic Disbonding of P
9、ipelineCoatingsG12 Test Method for Nondestructive Measurement of FilmThickness of Pipeline Coatings on SteelG14 Test Method for Impact Resistance of Pipeline Coat-ings (Falling Weight Test)G20 Test Method for Chemical Resistance of PipelineCoatings2.2 American Petroleum Institute Specification:API R
10、P 5L7 Recommended Practice for Internal FusionBonded Epoxy Coating of Line Pipe32.3 National Association of Corrosion Engineers Standard:TM0175 Visual Standard for Surfaces of New Steel Cen-trifugally Blast Cleaned with Steel Shot or Steel Grit(Nace No. 2)42.4 Steel Structures Painting Council Stand
11、ards:SSPC VIS 1 Visual Standards5SSPC-SP 1 Surface Preparation Specification No. 1: Sol-vent Cleaning5SSPC-SP 10 Near-White Blast Cleaning53. Ordering Information3.1 Information items to be considered, if appropriate, forinclusion in purchase orders are as follows:3.1.1 Specification designation and
12、 year of issue for H-pileor sheet piling,3.1.2 Section,1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is under the direct responsibility ofSubcommittee A01.02 on Structural Steel for Bridges, Buildings, Rolling Stock andShips.Curre
13、nt edition approved Sept. 1, 2007. Published September 2007. Originallyapproved in 1995. Last previous edition approved in 2003 as A 950/A 950M 99(2003).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMSt
14、andards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from the American Petroleum Institute, 1220 L St., Washington, DC20005.4Available from the National Institute of Corrosion Engineers, 1440 SouthCreek, Houston, TX 77084.5Available from the Steel St
15、ructures Painting Council, 40 24th St., Pittsburgh,PA 15213.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.3 Quantity,3.1.4 Length,3.1.5 Portions to be coated (full length or distance from endto remain bare),3.1.6 Requirements f
16、or certifications (see 13.1),3.1.7 Requirements for material samples (see 4.3),3.1.8 Requirements for patching material sample (see 4.5),3.1.9 Requirements for visual standard of comparison forsurface cleaning (see 5.1),3.1.10 Requirements for number and frequency of tests (see8.1), and3.1.11 Requir
17、ements for inspection at the manufacturingplant (see 11.1).NOTE 2An example of an ordering description is as follows: Struc-tural steel sheet piling, Grade 60, Type 1, to ASTM 572 ; section PZ35,20 000 ft, 40 ft, 0 in. long in secured lifts, epoxy-coated toASTMA 950 ,including certification for coat
18、ed sheet piling, sample of coating material,2 gal of patching material, and surface cleaning comparison withSSPC-VIS 1.Structural steel sheet piling, Grade 400, Type 1, to ASTM 572M ;section PZ35, 6000 m, 12 m long in secured lifts, epoxy-coated to ASTMA 950M , including certification for coated she
19、et piling, sample ofcoating material, 8 L of patching material, and surface cleaning compari-son with SSPC-VIS 1.4. Materials4.1 Steel H-piles to be coated shall meet the requirements ofSpecifications A 36/A 36M, A 572/A 572M, A 588/A 588M, orA 690/A 690M, whichever is specified in the order. Steel
20、sheetpiling to be coated shall meet the requirements of Specifica-tions A 328/A 328M, A 572/A 572M, A 690/A 690M, orA 857/A 857M, whichever is specified in the order.NOTE 3Surface conditions such as slivers, gouges, laminations, pits,and sharp edges can cause coating application difficulties and eff
21、ort shouldbe made to hold these conditions to a minimum.4.2 The coating material shall meet the requirements listedin Annex A1 and shall be approved by the purchaser.4.2.1 A written certification shall be furnished to the pur-chaser that properly identifies the batch designation of thepowder coating
22、 used in the order, material, quantity repre-sented, date of manufacture, name and address of manufac-turer, and a statement that the supplied powder coating is thesame composition as that prequalifed to Annex A1 of thisspecification. The powder coating shall be used within themanufacturers written
23、recommended shelf life.4.3 If specified in the order, a representative 8-oz. 0.2-kgsample from each batch of the powder coating shall be suppliedto the purchaser. The sample shall be packaged in an airtightcontainer and identified by the batch designation.4.4 The powder coating shall be maintained i
24、n atemperature-controlled environment following the written rec-ommendations of the powder coating manufacturer until readyfor use, at which point the powder coating will be givensufficient time to reach approximate plant ambient temperature.4.5 The patching material shall be as recommended by thepo
25、wder coating manufacturer and shall be compatible with thecoating. If specified in the order, a sample of the patchingmaterial shall be supplied to the purchaser.5. Surface Preparation5.1 Prior to blast cleaning, the surfaces of steel H-piles andsheet piling to be coated shall be precleaned, as requ
26、ired, inaccordance with SSPC-SP1. Steel surfaces shall be cleaned byabrasive blast cleaning to near-white metal in accordance withSSPC-SP10. The cleaning media used shall produce an anchorpattern profile of 1.5 mils to 4.0 mils 40 to 100 m. The visualstandard of comparison used to define the final s
27、urface condi-tion shall be SSPC-VIS1 or TM0175. Expended blasting mediadebris and dust shall be removed from blasted surfaces prior toapplying coating.5.2 Prior to application of the fusion-bonded epoxy coating,raised slivers, scabs, laps, sharp edges, or seams shall beremoved using abrasive grinder
28、s. No individual area of grind-ing shall exceed 36 in.2230 cm2. Total area of grinding shallnot exceed 1 % of total surface area.5.3 Slivers raised during the cleaning or coating applicationprocess shall be treated as permissible coating damage andrepaired per Section 10.5.4 It shall be permissible
29、for a chemical wash and/orconversion of the steel H-piles or sheet piling surface to beused. This pretreatment shall be applied after abrasive blastcleaning and before coating, in accordance with the writtenapplication instructions specified by the pretreatment manufac-turer.6. Application of Coatin
30、g6.1 The powder coating shall be applied to the cleaned andpretreated (if applicable) surface as soon as possible and beforevisible oxidation of the surface occurs, as discernible to aperson with normal or corrected vision. In no case shallapplication of the coating be delayed more than 3 h aftercle
31、aning.6.2 To achieve the required coating thickness (see 7.1), thesteel shall be preheated prior to applying the powder coating inaccordance with the manufacturers written recommendations.The heat source shall not leave a residue or contaminant on thesteel surfaces. If oxidation occurs, the steel sh
32、all be cooled toambient temperature and recleaned before applying the powdercoating.6.3 The powder coating shall be applied and cured inaccordance with the powder coating manufacturers writtenrecommendations.6.4 Areas of steel sections not requiring coating to allowwelding or for other purposes shal
33、l be specified by thepurchaser and shall be blocked-out during the coating applica-tion.7. Requirements for Coated H-Piles and Sheet Piling7.1 Thickness of Coating:7.1.1 The minimum thickness of coating after curing on flatsurfaces of H-piles and sheet piling shall be 12 mils 300 m.The minimum thick
34、ness of coating after curing on edges andcorners of sections, as measured on flat surfaces12 in. 13 mmfrom these edges and corners of sections, shall be a minimumof 7 mils 175 m. It shall be permissible for the coatingthickness to be reduced on the ball and socket of sheet piling.7.1.2 Measurements
35、shall be made in accordance with TestMethod G12following the instructions for calibration and useA 950/A 950M 99 (2007)2recommended by the thickness gage manufacturer. Gages shallbe of the pull-off or fixed probe type, except that “pencil-type”pull-off gages, which require the operator to observe th
36、ereadings at the instant the magnet is pulled from the surface,shall not be used.7.1.3 Thickness measurements on test sheet piling sectionsshall be taken on flat surfaces and corners of each side and edgeat 2 ft 0.6 m intervals along piling sections. Thicknessmeasurements on test H-piles shall be ta
37、ken alternately on theedges of flanges, outside and inside of flat surfaces of flanges,intersection of flanges and web, and on each side of the web at2 ft intervals along H-pile sections.NOTE 4Powder coating overspray at interlock segments of sheetpiling is inherent to the coating process and should
38、 be considered to beacceptable. A heavier coating thickness in these areas may result in theinability to join pieces.7.2 Continuity of Coating:7.2.1 Damaged or deficiently coated areas, as discernible toa person with normal or corrected vision, shall be patched inaccordance with the patching manufac
39、turers written recom-mendations.7.2.2 The applied coating after curing shall not have morethan an average of two holidays (pinholes not discernible to aperson with normal or corrected vision) per square foot 21holidays per square metre of the coated section,as determinedby dividing the total number
40、of holidays for the individualsection checked by its total outside surface area.7.2.3 Holiday checks to determine acceptability shall bemade only at the manufacturers plant with a 67.5-V directcurrent, 80 000V wet sponge holiday detector.7.2.4 Holiday checks on test sheet piling sections shall bemad
41、e on flat surfaces and corners of each side and edge at 2 ft0.6 m intervals along piling sections. Holiday checks on testH-piles shall be taken alternately on the edges of flanges,outside and inside of flat surfaces of flanges, intersection offlanges and web, and on each side of the web at 2 ft inte
42、rvalsalong pile sections.7.3 Flexibility of the Coating:7.3.1 Flexibility of the coating shall be checked by bendingcoated test panels. Test panels shall be of the same thickness asthe respective sheet piling sections or H-pile flange and shall becoated along with these sections using the same appli
43、cationequipment and procedures.NOTE 5Bend tests to determine coating flexibility acceptance areintened to be performed at the manufacturers plant.7.3.1.1 Test panels shall be bent around a mandrel to aminimum of 1.5 total deflection (after rebound) at ambienttemperature in accordance with 5.3.3.1 of
44、 API RP 5L7. Theradius of the mandrel shall be calculated using the followingequation:R 5 37.7twhere:R = mandrel radius andt = panel thickness including coating.When no mandrel of the calculated size is available, it shallbe permissible that a smaller radius mandrel be substituted.7.3.2 No cracking
45、or disbonding of the coating on theoutside radius of the test panels shall be discernible to a personwith normal or corrected vision. Except as specified in Section9, cracking or disbonding of the coating shall be cause forrejection of the coated H-piles or sheet piling represented bythe bend test p
46、anels.7.3.3 Fracture or failure of the steel in the bend test shall notbe considered a failure of the coating. Another test panel fromthe same production lot shall be substituted for repeat testing.7.4 All requirements for coated H-piles and sheet pilingshall be met at the manufacturers plant prior
47、to shipment.8. Number of Tests8.1 Unless a higher number or higher frequency, or both, isspecified in the order, one test for coating thickness, continuity,and flexibility shall be made once every 4 h.9. Retests9.1 If any test specimen for coating thickness, continuity, orflexibility fails to meet t
48、he specified requirements, two furthercoated specimens from the same lot shall be subjected to thetest or tests in which the original sample failed. If bothadditional coated test specimens pass the retest, the lot fromwhich they were taken shall be deemed to meet the require-ments of this specificat
49、ion. If either of them fails, the lot shallbe deemed not to comply with this specification.9.2 If the lot does not comply with this specification, the lotimmediately preceding and immediately following the non-compliant lot shall have two test pilings selected from themwhich shall be subjected to the test or tests in which theoriginal pilings failed. If all test pilings pass the retests, the lotsshall be deemed in compliance with this specification.9.3 In the case of a second non-compliant lot, the untestedlot immediately next to it, which
