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GB/T 1591-1994 Low-Alloy High-Strength Structural Steel Technical Requirements
GB/T 1591-1994, “Low-Alloy High-Strength Structural Steel” (hereinafter referred to as the “Technical Specifications”), was enacted on December 5, 1994, and implemented on March 5, 1995. This Standard was the basis for the classification, quality index, technical requirements, inspection rules and inspection methods, packaging, marking and quality certificates for low-alloy high-strength structural steels.
The low-alloy high-strength structural steel used in the Technical Specifications refers to ordinary low-alloy high-strength structural steels that can be quenched and tempered, with a carbon content of not more than 0.21%, and an appropriate amount of one or more elements of niobium, titanium, vanadium, zirconium, boron, and rare earth added as solid solution strengthening. The microstructure of the steel produced is mainly tempered martensite or tempered bainite.
The Technical Specifications consists of 14 Chapters and 6 Appendices. The Chapters are entitled: Terms and Definitions, Information to be provided by the party ordering, Steel grades, Chemical composition, Technical requirements, Inspection rules and inspection methods, Packaging, mark, certification and quality certificate. Each Chapter has a set of requirements which must be adhered to.
The Technical Specifications set out the quality index and technical requirements of the low-alloy high-strength structural steels. The quality index mainly includes the following items: chemical composition requirement, mechanical performance requirement, impact energy test, tempering treatment index, etc. In addition, the product should also be subject to ultrasonic inspection and magnetic testing.
Inspection rules and inspection methods for low-alloy high-strength structural steels are also stipulated. According to the product types, three groups of inspection items are listed: type I, II and III, of which the inspection items include dimensions and surface quality, mechanical properties and impact properties, results of ultrasonic inspection and magnetic testing.
The Technical Specifications further regulates the requirements of packaging, mark, certification and quality certificate. The materials must be packed firmly, and the product shall be clearly marked with the batch number and other necessary information. The quality certificate is also required.
The Technical Specifications provides a basis for product quality evaluation and can serve as reference for research and application of low-alloy high-strength structural steels. The requirements for low-alloy high-strength structural steels in the Technical Specifications shall be implemented when the product is used for structure, bridge and engineering construction.
