GB standard steel profiles are commonly used in several countries. China is the primary user, with domestic construction, manufacturing, and infrastructure projects relying heavily on these profiles due to local production, compliance with national standards, and cost - effectiveness. In Southeast Asian countries like Vietnam, Thailand, and Indonesia, GB profiles are widely adopted, especially in infrastructure projects under the Belt and Road Initiative. Chinese contractors often introduce GB standards, and the affordability and availability of these profiles support rapid development in the region. African countries also increasingly use GB steel profiles in public works, housing construction, and energy projects. The combination of reasonable prices, reliable quality, and the ability to meet local project requirements makes them a preferred choice. Additionally, some Middle Eastern countries use GB profiles in large - scale construction projects, such as skyscrapers and industrial facilities, valuing their cost - performance ratio and the technical support provided by Chinese suppliers.