GB/T 24186 - 2022 High Strength Abrasion Resistant Steel Plate, Sheet and Strip for Construction Machine
A national recommended standard released and implemented in 2022, superseding the 2009 version. It specifies technical requirements for high-strength wear-resistant steel plates used in critical components of construction machinery such as excavators, loaders, and dump trucks.
GB is the abbreviation for China's national standards, derived from the pinyin initials of the Chinese characters "国标" (Guóbiāo). GB standards are mandatory, while GB/T standards are recommended.
GB/T 24186-2022 "High Strength Abrasion Resistant Steel Plate, Sheet and Strip for Construction Machine" is a national recommended standard released and implemented in 2022, superseding the 2009 version. It specifies technical requirements for high-strength wear-resistant steel plates used in critical components of construction machinery such as excavators, loaders, and dump trucks. The standard defines grade designations, chemical composition, mechanical properties, technological performance, surface quality, and testing methods.
Grades typically start with "NM," followed by numbers indicating the minimum Brinell hardness (HBW), such as NM400 and NM500. Some grades further classify impact energy levels (e.g., NM400A, NM400B). The key feature lies in achieving a balanced combination of high hardness (for excellent wear resistance), good toughness, weldability, and cold formability through alloying elements like Cr, Mo, Ni, B, and quenching (sometimes plus tempering) heat treatment. High hardness effectively resists abrasive wear, while sufficient toughness and ductility prevent brittle fracture under complex operating conditions.
The implementation of GB/T 24186-2022 provides a unified basis for material selection in the construction machinery industry, helps improve service life and reliability of equipment components, promotes advancements in domestic wear-resistant steel production technology, and supports the high-quality development of the construction machinery sector.
