ASTM A1090/A1090M-19(2024) PDF

Overview

ASTM A1090/A1090M-19(2024) is a standard specification developed by ASTM International that covers high-strength, low-alloy steel forged rings and hollows. These products are primarily intended for use as base plates in welded tubular structures for power transmission applications. Notably, the steels specified offer outstanding atmospheric corrosion resistance, making them suitable for use in exposed conditions without the need for protective coatings. The specification outlines important requirements for ordering, material composition, manufacturing processes, mechanical properties, heat treatment, and testing.

Key Topics

• Scope and Range

  • Applies to forged rings and hollows used mainly as base plates in structures supporting power transmission lines.
  • The specification is not limited to this application and may be used wherever similar mechanical and environmental performance is required.

• Atmospheric Corrosion Resistance

  • Grades A, B, and C provide significantly enhanced durability compared to ordinary carbon structural steels, with or without copper addition.
  • These materials are suitable for outdoor, unpainted service in most environments.

• Material Thickness and Strength

  • Typically covers thicknesses from 2 in. to 6 in. [51 mm to 152 mm], but actual application is only limited by the steel’s capacity to meet mechanical property requirements.
  • Heat treatment classes: Class 1 (liquid quenched and tempered), Class 2 (normalized or normalized and tempered).

• Chemical and Mechanical Requirements

  • Specifies maximum and minimum elements for each grade to ensure corrosion resistance and mechanical performance.
  • Requires minimum yield and tensile strengths, elongation, and impact resistance validated by testing.

• Test Methods and Quality Assurance

  • Specifies test frequencies and locations for Charpy V-notch and tensile properties.
  • Non-destructive evaluation and additional purchaser-specified requirements are permitted.

Applications

ASTM A1090/A1090M-19(2024) provides practical, reliable guidance for the manufacture and safe use of forged steel components in power transmission infrastructure. Key application areas include:

• Power Transmission Structures
  • Base plates for welded tubular columns and support structures used to carry electrical or communications lines.
• Outdoor Structural Components
  • Suitable for use as uncoated, exposed steel in bridges, buildings, and heavy-duty industrial assemblies where long-term corrosion resistance is critical.
• Construction Sectors
  • Used in bolted, riveted, or welded constructions requiring high strength and enhanced environmental durability.

By supporting both inch-pound and SI units, this standard facilitates adoption by global users and manufacturers.

Related Standards

• ASTM A6/A6M - General requirements for rolled structural steel bars, plates, shapes, and sheet piling.
• ASTM A370 & A1058 - Mechanical testing methods for steel products.
• ASTM A788/A788M - General requirements for steel forgings.
• ASTM E112 - Test methods for determining the average grain size.
• ASTM G101 - Guide for estimating atmospheric corrosion resistance of low-alloy steels.

These referenced ASTM standards provide further requirements on mechanical testing, general manufacturing practices, and evaluation methods, ensuring comprehensive quality control and performance verification for forged rings and hollows used as base plates.

Keywords: ASTM A1090, forged rings, hollow forgings, base plates, power transmission structures, high-strength low-alloy steel, corrosion resistance, structural steel, mechanical requirements, outdoor structures, welding, standard specification.