Weathering-grade steels are currently supplied under AASHTO Specification M270, ASTM A709 Grade 50W, and in high-performance steel grades HPS 50W, 70W, and 100W. When used in the right environment, these steels are very cost-effective in both the short and long term as they eliminate the need for shop and field painting.
ASTM-A709, 2009 - MADCADNeed help? Chat now. Live Chat - Free Trial - Webinar - Feedback Cart (0)
ASTM's steel standards are instrumental in classifying, evaluating, and specifying the material, chemical, mechanical, and metallurgical properties of the different types of steels, which are primarily used in the production of mechanical components, industrial parts, and construction elements, as well as other accessories related to them.
Weathering steel in architectural applications.50W and HPS 50W are available in rolled shapes. Other grades such as HPS 70W, cover plates of various thick-Chicagos richard J. Daley Center, as well as its iconic Pablo Picasso sculpture, was the first building to be entirely built with exposed weathering steel. Photos by Keith Grubb
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SpecificationsPurposeAvailabilityExamplesQualificationInternational1.1 This specification covers carbon and high-strength low-alloy steel structural shapes, plates, and bars, quenched and tempered alloy steel, and stainless steel for structural plates intended for use in bridges. Twelve grades are available in five yield strength levels as follows:1.2 Grade HPS 70W [HPS 485W] or HPS 100W [HPS 690W] shall not be substituted for Grades 36 , 50 , 50S [345S], 50W [345W], or HPS 50W [HPS 345W]. Grade 50W [345W], or HPS 50W [HPS 345W] shall not be substituted for GrGIRDER - Virginia Department of TransportationASTM A709 Grade HPS 50W (except for fracture critical members) and HPS 70W shall not be used without a design waiver. Thus, use of a hybrid girder requires an approved design waiver. Painted or galvanized ASTM A709 Grade 50 shall be used for trusses. Structural pipe and tubing shall be galvanized inside and outside.