1、Standard Specification for Steel Sheet, Zinc-Coated (Galvanized), for Corrugated Steel Pipe AASHTO Designation: M 218-03 (2016) Release: Group 2 (June 2016) American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001TS-4b M 218-1
2、 AASHTO Standard Specification for Steel Sheet, Zinc-Coated (Galvanized), for Corrugated Steel Pipe AASHTO Designation: M 218-03 (2016) Release: Group 2 (June 2016) 1. SCOPE 1.1. This specification covers steel sheet used in the manufacture of corrugated steel pipe (CSP) for storm sewers, culverts,
3、drains, and similar uses. The sheet is zinc-coated (galvanized) by the hot-dip process, and is produced in two coating weights, 610 g/m2and 1220 g/m2. Material for this use is furnished in coils, flat in cut lengths, and corrugated in cut lengths. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standard: T 65M/
4、T 65, Mass Weight of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings 2.2. ASTM Standards: A754/A754M, Standard Test Method for Coating Weight (Mass) of Metallic Coatings on Steel by X-Ray Fluorescence A902, Standard Terminology Relating to Metallic Coated Steel Products A924/A924
5、M, Standard Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process B6, Standard Specification for Zinc E29, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications E376, Standard Practice for Measuring Coating T
6、hickness by Magnetic-Field or Eddy-Current (Electromagnetic) Testing Methods 3. TERMINOLOGY 3.1. DefinitionsFor definitions of terms used in this standard, refer to ASTM A902. The following definitions are as stated in that standard. 3.1.1. fabricator(1) the organization that produces the finished p
7、ipe, or (2) for structural plate pipe, the organization that processes flat sheets and other items needed for the field assembly of the finished products. 3.1.2. manufacturerthe organization that produces the metal sheet from which pipe is made. 3.1.3. purchaserthe person or agency that purchases th
8、e finished pipe. 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4b M 218-2 AASHTO Note 1With regard to this specification for sheet for corrugated steel pipe, the fabricator may also be considered a
9、s the “purchaser” of the sheet, where that term is used in this specification. Such interpretation would not restrict the purchaser of the finished pipe from enforcing any provisions of this specification. 4. ORDERING INFORMATION 4.1. All sheet, both flat and formed, covered by this specification sh
10、all be ordered only to the specified thicknesses listed in Table 4. 4.2. Unless otherwise specified in the purchase order, all material furnished to this specification shall be chemically treated. 4.3. Orders for material to this specification shall include the following information, as necessary, t
11、o adequately describe the desired product: 4.3.1. Name of material (galvanized steel sheet for CSP); 4.3.2. AASHTO designation and year of issue as M 218-_; 4.3.3. Coating thickness (610 g/m2or 1220 g/m2). A coating weight of 610 g/m2will be supplied as a default if no coating weight is specified; 4
12、.3.4. Quantity and Dimensions: 4.3.4.1. Cut Lengthsshow number of sheets; thickness; width; either flat or overall corrugated; length; pitch and depth of corrugations, if corrugated; 4.3.4.2. Coiled Sheetshow total mass; thickness; width; coil requirements (maximum outside diameter, acceptable insid
13、e diameter, and maximum mass of individual coils); 4.3.5. Certification, if required (Section 11.1); and 4.3.6. Special requirements. Note 2A typical ordering description is as follows: Galvanized steel sheet for CSP in accordance with M 218-_, 610 g/m2, 45 000 kg, 2.77 by 700 mm by coil, 1500 mm ma
14、x OD, 600 mm ID, 7000 kg max, certified. 5. CHEMICAL COMPOSITION 5.1. Base Metal AnalysisThe base metal cast or product analyses shall conform to the chemical requirements of Table 1. Table 1Chemical Composition Cast Analysis Product Analysis Sulfur, max, % 0.05 0.06 Sum of carbon, manganese, phosph
15、orus, silicon, and sulfur, max, % 0.70 0.74 5.2. Coating Bath Composition (Zinc Coating)the coating bath metal shall contain not less than 99 percent zinc. 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable la
16、w.TS-4b M 218-3 AASHTO 6. MECHANICAL PROPERTIES 6.1. The galvanized steel sheet shall conform to the mechanical requirements in Table 2. Table 2Mechanical Requirements (Properties of Flat Sheet Prior to Fabrication)a Tensile strength, min,bMPa 310 Yield point, min,bMPa 230 Elongation in 50 mm,cmin,
17、% 20 aTo determine conformance with this specification, round each value for tensile strength and for yield strength to the nearest 1 MPa and each value for elongation to the nearest 1 percent, both in accordance with the rounding method of ASTM E29. bYield point and tensile strength are based on th
18、ickness of the base metal. If tests are made after coating, determine the base metal thickness after stripping the coating from the ends of the specimen contacting the grips of the tension-testing machine prior to tensile testing. cElongation requirement does not apply to material tested after corru
19、gating. 6.2. Two tension tests shall be made on random samples of finished material from each cast or heat. When the finished material from said cast or heat is less than 45 Mg, one test is sufficient. When material rolled from one cast or heat differs 1.25 mm or more in thickness, one tension test
20、shall be made from both the thickest and thinnest material rolled regardless of the mass represented. The samples shall be prepared and tested in accordance with the method specified in ASTM A924/A924M. 7. COATING REQUIREMENTS 7.1. The mass of zinc coating shall conform to the requirements in Table
21、3. The mass of coating is the total amount on both surfaces of the sheet expressed in g/m2of sheet. Table 3Coating Mass Requirements Coating Mass, Total Both Sides Equivalent Coating Thickness, Total Both SidesaTriple Spot Average, Min, g/m2Single Spot, Min, g/m2Triple Spot Average, Min, m Single Sp
22、ot, Min, m 610 550 86 78 1220 1100 172 156 a Coating thicknesses are approximate, for information only. (See Section 9.5.1.) Conversion is based on the following relationship: 1 g/m2= 0.1415 m. 7.2. Adhesion of the coating shall be such that no peeling or flaking occurs while the coated sheet is bei
23、ng corrugated and formed into pipe. 8. DIMENSIONS AND TOLERANCES 8.1. ThicknessSheet thickness shall conform to dimensions prescribed in Table 4. The thickness of the sheet includes both the base steel and the zinc coating. 2016 by the American Association of State Highway and Transportation Officia
24、ls. All rights reserved. Duplication is a violation of applicable law.TS-4b M 218-4 AASHTO Table 4Coated Steel Sheet Thickness Requirements Specified Thickness, mm Minimum Thickness, mm 1.02 0.91 1.32 1.17 1.63 1.45 2.01 1.83 2.77 2.57 3.51 3.28 4.27 4.04 Note: Thickness is measured not less than 10
25、 mm from an edge. On corrugated sheet, thickness is measured on the tangents of corrugations. For 1220 g/m2coating, the specified thickness and the minimum thickness shall be increased by 0.076 mm to account for the greater thickness as compared with the 610 g/m2. 8.2. LengthPermissible variations i
26、n length of cut-length sheets, both flat and corrugated, shall be in accordance with ASTM A924/A924M. 8.3. Flat SheetPermissible variations in width and camber of flat materials shall be in accordance with ASTM A924/A924M. Flatness tolerances are shown in Table 5. Table 5Flatness Tolerances (Cut Len
27、gths Only) Specified Thickness, mm Specified Width, mm Flatness Tolerance (Maximum Deviation from a Horizontal Flat Surface), mm 1.63 and thicker To 1500, incl 13 1.32 and thinner To 900, incl 13 Over 900 to 1500, incl 19 Note: This table also applies to sheets cut to length from coils by the fabric
28、ator when adequate flattening measures are performed. 8.4. Corrugated Sheet: 8.4.1. CorrugationsCorrugations shall form smooth continuous curves and tangents. The dimensions of the corrugations shall be in accordance with Table 6. Table 6Corrugation Size Radius of Curvature, mm Nominal Size, mm Max
29、Pitch,amm Min Depth,bmm Nominal Min 68 by 13 73 12 17 12 75 by 25 83 24 14 12 125 by 25 135 24 40 36 aPitch is measured from crest to crest of corrugations, at 90 degrees to the direction of the corrugations. bDepth is measured as the vertical distance from a straightedge resting on the corrugation
30、crests to the bottom of the intervening valley. 8.4.2. Covering Width and Lip DimensionCovering width of corrugated sheet shall be in accordance with Table 7. Covering width is the distance between the crests of the extreme corrugations. The lip dimension of corrugated sheet shall be in accordance w
31、ith Table 8 and is measured along the radial curvature from the crest of the corrugation to the edge of the sheet. There is no established tolerance for overall width since the covering width and lip dimensions are the governing factors for the formed product. 2016 by the American Association of Sta
32、te Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS-4b M 218-5 AASHTO Table 7Covering Width Tolerance for Corrugated Sheet Covering Width, mm Tolerance Over and Under, mm To 600, incl 6 Over 600 to 900, incl 10 Over 900 to 1200, incl 13 Table
33、 8Corrugated Sheet Lip Dimensions Nominal Corrugation Size, mm For Riveted Pipe Construction,a mm For Spot-Welded Pipe Construction, Min, mm 68 by 13 19 11 75 by 25 22 13 125 by 25 22 13 a Tolerances, +5 mm, 0. 9. TESTING 9.1. The manufacturer shall make such tests and measurements as deemed necessa
34、ry to ensure that the coated sheet produced complies with this specification. 9.2. The purchaser may make tests and measurements as determined to be necessary to confirm conformance with this specification. 9.3. Chemical Analysis of SteelCast analysis (by the manufacturer) and product analysis (by t
35、he purchaser) shall be in accordance with ASTM A924/A924M. 9.4. Mechanical TestingMechanical property tests shall be conducted on the sheet prior to corrugating or other fabrication, when possible, and shall be in accordance with ASTM A924/A924M. If tests are made after corrugating, specimens shall
36、be taken on the tangents of corrugations and used for determination of tensile and yield strengths only. 9.5. Coating Mass: 9.5.1. Sampling for coating mass determinations shall be in accordance with ASTM A924/A924M. The mass of coating shall be determined according to T 65M/T 65. 9.5.2. The mass ma
37、y be converted from the sum of readings on both surfaces of the sheet by a magnetic thickness gauge suitably checked and demonstrated for accuracy (Note 3) 1 m = 7.1 g/m2each surface. When a magnetic thickness gauge is used and a dispute arises, the mass shall be determined by the stripping test in
38、T 65M/T 65. 9.5.3. The mass of coating may be determined from the coating thickness measured by the x-ray fluorescence method, according to ASTM A754/A754M. When this method is used and a dispute arises, the mass shall be determined by the stripping test in T 65M/T 65. Note 3Several magnetic and ele
39、ctromagnetic types of coating thickness gauges are commercially available and are a satisfactory basis for acceptance when properly calibrated just prior to inspection use (see ASTM E376). 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplicatio
40、n is a violation of applicable law.TS-4b M 218-6 AASHTO 10. REJECTION AND REHEARING 10.1. Material tested by the purchaser and found not conforming to this specification may be rejected subject to the rejection and rehearing provisions of ASTM A924/A924M. 11. CERTIFICATION 11.1. When specified in th
41、e purchase order or contract, a manufacturers certification shall be furnished to the purchaser. The certification shall be in accordance with the provisions of ASTM A924/A924M and shall include reference to this product specification designation. 11.2. Test results, including chemical composition,
42、mechanical properties, and mass of coating for each heat and coating lot, shall be maintained by the sheet manufacturer for 7 years and shall be made available to the fabricator and purchaser upon request. 12. PRODUCT MARKING 12.1. Each 0.5 to 1.5 m of sheet in coils or cut lengths shall be identifi
43、ed by showing the following: 12.1.1. Name of manufacturer; 12.1.2. Brand name; 12.1.3. Specified thickness; 12.1.4. Specified coating mass; 12.1.5. Identification symbols relating to a specific heat number and coating lot number; and 12.1.6. AASHTO designation number. 12.2. The brand shall be remove
44、d, obliterated, or rebranded “Non-Specification” on each 0.5 to 1.5 m of sheet in a coating lot or heat in which control tests show, as prescribed herein, nonconformance to this specification. 2016 by the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.
