1、Designation: A950/A950M 11 (Reapproved 2015)Standard Specification forFusion-Bonded Epoxy-Coated Structural Steel H-Piles andSheet Piling1This standard is issued under the fixed designation A950/A950M; the number immediately following the designation indicates the yearof original adoption or, in the
2、 case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers structural steel H-piles andsheet piling with protective fusi
3、on-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 either
4、inch-pound units (as Specification A950) or SI units (asSpecification A950M). 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, if an
5、y, 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:2A6/A6M Specification for General Requirements for
6、RolledStructural Steel Bars, Plates, Shapes, and Sheet PilingA36/A36M Specification for Carbon Structural SteelA328/A328M Specification for Steel Sheet PilingA572/A572M Specification for High-Strength Low-AlloyColumbium-Vanadium Structural SteelA588/A588M Specification for High-Strength Low-AlloyStr
7、uctural Steel, up to 50 ksi 345 MPa Minimum YieldPoint, with Atmospheric Corrosion ResistanceA690/A690M Specification for High-Strength Low-AlloyNickel, Copper, Phosphorus Steel H-Piles and SheetPiling with Atmospheric Corrosion Resistance for Use inMarine EnvironmentsA857/A857M Specification for St
8、eel Sheet Piling, ColdFormed, Light GageB117 Practice for Operating Salt Spray (Fog) ApparatusG8 Test Methods for Cathodic Disbonding of Pipeline Coat-ingsG12 Test Method for Nondestructive Measurement of FilmThickness of Pipeline Coatings on Steel (Withdrawn2013)3G14 Test Method for Impact Resistan
9、ce of Pipeline Coatings(Falling Weight Test)G20 Test Method for Chemical Resistance of Pipeline Coat-ings2.2 American Petroleum Institute Specification:4API RP 5L7 Recommended Practice for Internal FusionBonded Epoxy Coating of Line Pipe2.3 National Association of Corrosion Engineers Standard:5TM017
10、5 Visual Standard for Surfaces of New Steel Cen-trifugally Blast Cleaned with Steel Shot or Steel Grit(Nace No. 2)2.4 Steel Structures Painting Council Standards:6SSPC-SP 1 Surface Preparation Specification No. 1: SolventCleaningSSPC-SP 10 Near-White Blast CleaningSSPC-VIS 1 Visual Standards3. Gener
11、al Requirements for Delivery3.1 Structural products furnished under this specificationshall conform to the requirements of Specification A6/A6M,for the specific structural product order, unless a conflict existsin which case this specification shall prevail.1This specification is under the jurisdict
12、ion 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.Current edition approved Sept. 1, 2015. Published September 2015. Originallyapproved in 1995. Last pre
13、vious edition approved in 2011 as A950/A950M 11.DOI: 10.1520/A0950_A0950M-11R15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page
14、onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American Petroleum Institute (API), 1220 L. St., NW,Washington, DC 20005-4070, http:/www.api.org.5Available from National Institute of Corrosion Engineers (NACE International(NACE),
15、 1440 South Creek Dr., Houston, TX 77084-4906, http:/www.nace.org.6Available from the Steel Structures Painting Council (SSPC), 40 24th St. #600,Pittsburgh, PA 15222, http:/www.sspc.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1
16、4. Ordering Information4.1 Information items to be considered, if appropriate, forinclusion in purchase orders are as follows:4.1.1 Specification designation and year of issue for H-pileor sheet piling,4.1.2 Section,4.1.3 Quantity,4.1.4 Length,4.1.5 Portions to be coated (full length or distance fro
17、m endto remain bare),4.1.6 Requirements for certifications (see 14.1),4.1.7 Requirements for material samples (see 5.3),4.1.8 Requirements for patching material sample (see 5.5),4.1.9 Requirements for visual standard of comparison forsurface cleaning (see 6.1),4.1.10 Requirements for number and freq
18、uency of tests (see9.1), and4.1.11 Requirements for inspection at the manufacturingplant (see 12.1).NOTE 2An example of an ordering description is as follows: Struc-tural steel sheet piling, Grade 60, Type 1, toASTM A572 ; section PZ35,20 000 ft, 40 ft, 0 in. long in secured lifts, epoxy-coated toAS
19、TM A950 ,including certification for coated 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 A572M ;section PZ35, 6000 m, 12 m long in secured lifts, epoxy-coated to ASTMA950M
20、 , including certification for coated sheet piling, sample ofcoating material, 8 L of patching material, and surface cleaning compari-son with SSPC-VIS 1.5. Materials5.1 Steel H-piles to be coated shall meet the requirements ofSpecifications A36/A36M, A572/A572M, A588/A588M,orA690/A690M, whichever i
21、s specified in the order. Steel sheetpiling to be coated shall meet the requirements of Specifica-tions A328/A328M, A572/A572M, A690/A690M,orA857/A857M, whichever is specified in the order.NOTE 3Surface conditions such as slivers, gouges, laminations, pits,and sharp edges can cause coating applicati
22、on difficulties and effort shouldbe made to hold these conditions to a minimum.5.2 The coating material shall meet the requirements listedin Annex A1 and shall be approved by the purchaser.5.2.1 A written certification shall be furnished to the pur-chaser that properly identifies the batch designati
23、on of thepowder coating used in the order, material, quantityrepresented, date of manufacture, name and address ofmanufacturer, and a statement that the supplied powder coatingis the same composition as that prequalifed to AnnexA1 of thisspecification. The powder coating shall be used within themanu
24、facturers written recommended shelf life.5.3 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.5.4 The powder coating sha
25、ll be maintained in 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.5.5 The patching material shall be as re
26、commended by thepowder coating manufacturer and shall be compatible with thecoating. If specified in the order, a sample of the patchingmaterial shall be supplied to the purchaser.6. Surface Preparation6.1 Prior to blast cleaning, the surfaces of steel H-piles andsheet piling to be coated shall be p
27、recleaned, as required, inaccordance with SSPC-SP 1. Steel surfaces shall be cleaned byabrasive blast cleaning to near-white metal in accordance withSSPC-SP 10. 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 t
28、o define the final surface condi-tion shall be SSPC-VIS 1 or TM0175. Expended blastingmedia debris and dust shall be removed from blasted surfacesprior to applying coating.6.2 Prior to application of the fusion-bonded epoxy coating,raised slivers, scabs, laps, sharp edges, or seams shall beremoved u
29、sing abrasive grinders. No individual area of grind-ing shall exceed 36 in.2230 cm2. Total area of grinding shallnot exceed 1 % of total surface area.6.3 Slivers raised during the cleaning or coating applicationprocess shall be treated as permissible coating damage andrepaired in accordance with Sec
30、tion 11.6.4 It shall be permissible 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 ma
31、nufac-turer.7. Application of Coating7.1 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 coati
32、ng be delayed more than 3 h aftercleaning.7.2 To achieve the required coating thickness (see 8.1), 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 surface
33、s. If oxidation occurs, the steel shall be cooled toambient temperature and recleaned before applying the powdercoating.7.3 The powder coating shall be applied and cured inaccordance with the powder coating manufacturers writtenrecommendations.7.4 Areas of steel sections not requiring coating to all
34、owwelding or for other purposes shall be specified by thepurchaser and shall be blocked-out during the coating applica-tion.8. Requirements for Coated H-Piles and Sheet Piling8.1 Thickness of Coating:A950/A950M 11 (2015)28.1.1 The minimum thickness of coating after curing on flatsurfaces of H-piles
35、and sheet piling shall be 12 mils 300 m.The minimum thickness 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 o
36、n the ball and socket of sheet piling.8.1.2 Measurements shall be made in accordance with TestMethod G12 following the instructions for calibration and userecommended by the thickness gage manufacturer. Gages shallbe of the pull-off or fixed probe type, except that “pencil-type”pull-off gages, which
37、 require the operator to observe thereadings at the instant the magnet is pulled from the surface,shall not be used.8.1.3 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. Thicknessmeasu
38、rements on test H-piles shall be taken 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 inheren
39、t to the coating process and should be considered to beacceptable. A heavier coating thickness in these areas may result in theinability to join pieces.8.2 Continuity of Coating:8.2.1 Damaged or deficiently coated areas, as discernible toa person with normal or corrected vision, shall be patched ina
40、ccordance with the patching manufacturers written recom-mendations.8.2.2 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 dete
41、rminedby dividing the total number of holidays for the individualsection checked by its total outside surface area.8.2.3 Holiday checks to determine acceptability shall bemade only at the manufacturers plant with a 67.5-V directcurrent, 80 000 wet sponge holiday detector.8.2.4 Holiday checks on test
42、 sheet piling sections shall bemade 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
43、 each side of the web at 2 ft intervalsalong pile sections.8.3 Flexibility of the Coating:8.3.1 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 t
44、hese sections using the same applicationequipment and procedures.NOTE 5Bend tests to determine coating flexibility acceptance areintended to be performed at the manufacturers plant.8.3.1.1 Test panels shall be bent around a mandrel to aminimum of 1.5 total deflection (after rebound) at ambienttemper
45、ature in accordance with 5.3.3.1 of 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 mandr
46、el be substituted.8.3.2 No cracking 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 Section10, cracking or disbonding of the coating shall be cause forrejection of the coated H-piles or sheet
47、 piling represented bythe bend test panels.8.3.3 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.8.4 All requirements for coated H-piles and sheet pilingshall be
48、met at the manufacturers plant prior to shipment.9. Number of Tests9.1 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.10. Retests10.1 If any test specimen for coating thickness, co
49、ntinuity,or flexibility fails to meet the specified requirements, twofurther coated specimens from the same lot shall be subjectedto the test 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 specification. If either of them fails, the lot shallbe deemed not to comply with this specification.10.2 If the lot does not comply with this specification, thelot immediately preceding and immediately followi
