Active Standard ASTM A742 / A742M | Developed by Subcommittee: A05.17
Book of Standards Volume: 01.06
Historical (view previous versions of standard)
This specification covers polymer precoated steel sheet for corrugated steel pipe (CSP) which is coated after metallic coating on continuous lines by coil coating (roller coating or laminating) processes. The metallic coating shall either be zinc, aluminum-zinc alloy, or zinc-aluminum-mischmetal alloy. Sheet for this purpose shall be furnished flat in coils, flat in cut lengths, or corrugated in cut lengths, all being protected by a mill-applied polymer coating on both sides. The polymer coating shall be classified by grade corresponding to the thickness on each side. Requirements for the cleaning process of the steel sheet and for the polymer coating are given. The test methods for the following polymer coating properties are detailed: adhesion, impact, thickness, holidays, abrasion resistance, imperviousness, freeze-thaw resistance, weatherability, and resistance to microbial attack.
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1.1 This specification covers polymer precoated steel sheet for corrugated steel pipe (CSP) which is coated after metallic coating on continuous lines by coil coating (roller coating or laminating) processes. The metallic coating is either zinc, 55 % aluminum-zinc alloy, or zinc-5 % aluminum-mischmetal alloy. Sheet for this purpose is furnished flat in coils, flat in cut lengths, or corrugated in cut lengths, all being protected by a mill-applied polymer coating on both sides.
1.2 The values stated in either inch-pound units or SI units are to be regarded separately as the standard. Within the text, the SI units are shown in brackets. The values stated in each system are not equivalents; therefore, each system must be used independently of the other.
1.3 The following precautionary caveat refers only to the test method portion, Section 9, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A929/A929M Specification for Steel Sheet, Metallic-Coated by the Hot-Dip Process for Corrugated Steel Pipe
D543 Practices for Evaluating the Resistance of Plastics to Chemical Reagents
D658 Test Method for Abrasion Resistance of Organic Coatings by Air Blast Abrasive
D1005 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
D2794 Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)
G22 Practice for Determining Resistance of Plastics to Bacteria
G23 Practice for Operating Light-Exposure Apparatus (Carbon-Arc Type) With and Without Water for Exposure of Nonmetallic Materials (Discontinued 2001)
G62 Test Methods for Holiday Detection in Pipeline Coatings
ICS Number Code 77.140.50 (Flat steel products and semi-products)