Steel Sheet, Metallic-Coated by the Hot-Dip Process for Corrugated Steel Pipe

A929/A929M: Standard Specification for Steel Sheet, Metallic-Coated by the Hot-Dip Process for Corrugated Steel Pipe

For professionals involved in civil engineering, infrastructure development, and construction, specifying the right materials is paramount for the longevity and performance of critical drainage systems. ASTM A929/A929M provides the authoritative benchmark for metallic-coated steel sheet, ensuring the robust construction of corrugated steel pipes used in storm sewers, culverts, and drainage applications. Understanding this essential standard is key to selecting materials that meet stringent performance requirements and offer proven durability.

What is A929/A929M?

ASTM A929/A929M is a comprehensive industry standard that governs the properties and performance of steel sheet intended for the fabrication of corrugated steel pipes. Originating from ASTM International, this specification ensures that the metallic coating applied via the hot-dip process provides the necessary corrosion resistance and mechanical integrity for demanding underground applications. Its primary purpose is to establish a clear set of requirements for manufacturers and users of this specialized steel product.

Scope & Purpose

This industry-leading standard details the requirements for various metallic coatings applied to steel sheet, including zinc, zinc-5% aluminum-Mischmetal (Zn-5Al-MM), 55% aluminum-zinc (55Al-Zn), and two types of aluminum coatings (Type 1 and Type 2). It covers the base metal composition, mechanical properties, coating weights, adhesion, and dimensional tolerances for steel sheet supplied in coils, flat cut lengths, and corrugated cut lengths. The standard is specifically for steel sheet used in the manufacture of corrugated steel pipe for storm sewers, culverts, and drains, and does not cover other steel sheet applications.

Who Must Comply?

• • Primary audience: Materials Engineers, Quality Control Inspectors, Design Engineers, Procurement Specialists, and Fabricators involved in the production and specification of corrugated steel pipes.
• • Industries affected: Construction, Civil Engineering, Manufacturing, Transportation Infrastructure, and Public Works.
• • Compliance nature: Primarily voluntary, but often mandated by project specifications, contract documents, and municipal or governmental regulations for public infrastructure projects.
• • Enforcement: Compliance is typically verified through material certifications, third-party inspections, and laboratory testing by project owners, engineers, or designated authorities.

Key Requirements Overview

Professionals must ensure that the steel sheet procured adheres to the following core provisions:

• • The standard requires specific chemical composition limits for the base steel to ensure weldability and mechanical properties.
• • Key provisions include detailed requirements for the weight and adhesion of the metallic coating, ensuring it withstands the corrugation and forming process without delamination.
• • The specification mandates specific mechanical properties, such as tensile strength and elongation, for the base metal prior to fabrication.
• • Users must select from a defined range of metallic coating types and, where applicable, coating weights or classes, as detailed in the standard.
• • Dimensional tolerances for thickness, width, and length are stipulated to ensure consistent product manufacturing.

Related Standards & References

ASTM A929/A929M is often utilized in conjunction with other ASTM standards to provide a comprehensive material specification. Complementary standards include:

• • **ASTM A924/A924M