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ASTM A709-50W is a standard specification for structural steel primarily in the fabrication of steel bridges. ASTM A709-50W covers high strength, low allow steel structural shapes, plates and bars. The atmospheric corrosion resistance of this steel in most environments is substantially better than carbon steel with or without copper addition.
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often referred to by the genericized steel and sometimes written without the hyphen as corten steel, is a group of steel alloys which were developed to eliminate the need for painting, and form a stable rust-like appearance if exposed to the weather for several years.
The original COR-TEN received the standard designation A 242 (COR-TEN A) from the ASTM International standards group. Newer ASTM grades are A 588 (COR-TEN B) and A 606 for thin sheet. All alloys are in common production and use.
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ASTM A709 / A709M Standard Specification for Carbon and High-Strength Low-Alloy Structural Steel Shapes, Plates, and Bars and Quenched-and-Tempered Alloy Structural Steel Plates for Bridges Products and Services / Standards & Publications / Standards Products
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17-4 stainless has high tensile strength and hardness and excellent corrosion resistance up to high temperatures. It is typically used in gate valves, chemical processing equipment, pump shafts, gears, ball bearings, bushings, and fasteners.
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09CuCrNi-B steel major added metal elements are nickel, copper and others. These elements change the basic properties of the original carbon steel. Let carbon steel has a better mechanical properties.09CuCrNi-B steel for better corrosion resistance and can be used as processing materials aboard, the container, the train tracks.Compared to stainless steel, only trace amounts of alloying elements, alloys such as weathering resisting steel elements of total phosphorus, copper, chromium, nickel, molybdenum, niobium, vanadium, titanium, etc. is only a few percent.
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S355JO is a medium tensile, low carbon manganese steel which is readily weldable and possess good impact resistance. This material is commonly supplied in the untreated or normalized condition. Machinability of this material is similar to that of mild steel.
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