Advance (Alloy Steel) International Trading Co., Ltd, as one of the most professional global distributors of ASTM / ASME / DIN code steel products in USA and China to meet all kinds of requests from oil, petrochemical, power, boiler, mechanical, desulphurization and other fields, our mission is to be our customers' priority choice whenever, wherever and whatever in need. AAS is the proud holder of ISO9000 / ASME quality system certificate, We are dedicated to being leaders in products, technology, service and quality, Our vast inventory is available after hours, weekends, during holidays-anytime, 365 days a year to fulfill our customers' emergency requirements, Our people in Houston, Hong Kong and Chinese Mainland are ready to provide you professional service anytime and anywhere.