Weathering steel发表评论(0)编辑词条

Weathering steel, best-known under the trademark COR-TEN steel, is a group of steel alloys which were developed to obviate the need for painting, and form a stable rust-like appearance if exposed to the weather for several years.

United States Steel Corporation (USS) holds the registered trademark on the name COR-TEN.[1] Although USS sold its discrete plate business to International Steel Group (now Arcelor-Mittal) in 2003,[2] it still sells COR-TEN branded material in strip-mill plate and sheet forms.

In some areas it may be known without the hyphen as "Corten steel".

The original COR-TEN received the standard designation A242 ("COR-TEN A") from the ASTM International standards group. Newer ASTM grades are A588 ("COR-TEN B") and A606 for thin sheet. All alloys are in common production and use.

"Weathering" means that due to their chemical compositions, these steels exhibit increased resistance to atmospheric corrosion compared to unalloyed steels. This is because the steel forms a protective layer on its surface under the influence of the weather.

The corrosion-retarding effect of the protective layer is produced by the particular distribution and concentration of alloying elements in it. The layer protecting the surface develops and regenerates continuously when subjected to the influence of the weather.

The mechanical properties of weathering steels depend on which alloy and how thick the material is.
ASTM A242
The original A242 alloy has a yield strength of 50,000 pounds per square inch (340,000 kPa) and ultimate tensile strength of 70,000 psi (480,000 kPa) for light-medium rolled shapes and plates up to 0.75 inches (19 mm) thick. It has yield strength of 46,000 psi (320,000 kPa) and ultimate strength of 67,000 psi (460,000 kPa) for medium weight rolled shapes and plates from 0.75–1 inch (19–25 mm) thick. The thickest rolled sections and plates - from 1.5–4 in (38–100 mm) thick have yield strength of 42,000 psi (290,000 kPa) and ultimate strength of 63,000 psi (430,000 kPa).

ASTM A588
A588 has a yield strength of at least 50,000 psi (340,000 kPa), and ultimate tensile strength of 70,000 psi (480,000 kPa) for all rolled shapes and plate thicknesses up to 4 in (100 mm) thick. Plates from 4–5 in (100–130 mm) have yield strength at least 46,000 psi (320,000 kPa) and ultimate tensile strength at least 67,000 psi (460,000 kPa), and plates from 5–8 in (130–200 mm) thick have yield strength at least 42,000 psi (290,000 kPa) and ultimate tensile strength at least 63,000 psi (430,000 kPa).

Weathering steel is popularly used in outdoor sculptures, such as in the large Chicago Picasso sculpture, and as exterior facades, for its rustic antique appearance.

It has also been used in bridge and other large structural applications such as the New River Gorge Bridge, the newer span of the Newburgh-Beacon Bridge, and the creation of the Australian Centre for Contemporary Art (ACCA).

It is very widely used in marine transportation, in the construction of Intermodal containers.[6]

The first use of COR-TEN for architectural applications was the John Deere World Headquarters in Moline, Illinois. The building was designed by architect Eero Saarinen, and completed in 1964. In 1977, Robert Indiana created a Hebrew version of the Love sculpture using the four letter word ahava (אהבה "love" in Hebrew) made from COR-TEN, for the Israel Museum Art Garden in Jerusalem, Israel.

COR-TEN was used by St. Louis Car Company to build an order of electric railcars for Illinois Central Railroad in 1971. For uniformity, the next order was built to similar specs, including COR-TEN bodies, by Bombardier in 1979. The use of COR-TEN was seen as a cost-cutting move in comparison with the railcar standard of stainless steel. The durability of COR-TEN railcars did not live up to expectations, and rust holes are appearing in the Illinois Central railcars. Most of these railcars still operate out of Chicago. No other orders of railcars have been made of weathering steel. It's also worth noting that the IC painted their COR-TEN railcars, an unusual practice for a steel designed to remain exposed. See pictures in the "external links" section. Painted weathering steel is no more corrosion-resistant than painted conventional steel, because the protective patina will not form in time to prevent corrosion over a localized area of attack such as a small paint failure.

耐候钢，其特征在于：该耐候钢的合金成份及重量百分比含量为：C：0.12～0.21、Si：0.2～2.0、Mn：0.7～2.0、S≤0.036、P≤0.034、Cu：0.10～ 0.40、Al＜0.2，其余为Fe和微量杂质。 主要用于铁道、车辆、桥梁、塔架等长期暴露在大气中使用的钢结构。该耐候钢的合金成分及重量百分比含量为：C：0.12～0.21、Si：0.2～2.0、Mn：0.7～2.0、S ≤0.036、P≤0.034、Cu：0.10～0.40、Al＜0.2，其余为Fe和微量杂质。通过Cu、 Mn、Si、Al等合金化，并简单调整普通低碳钢(Q235钢)的部分元素含量，在不需改变Q235钢生产工艺条件下，就能生产出具有良好的耐大气腐蚀性能、综合机械性能的经济耐候钢。
　　耐候钢（即耐大气腐蚀钢）是介于普通钢和不锈钢之间的价廉物美的低合金钢系列，在融入现代冶金新机制、新技术和新工艺后得以可持续发展和创新，属世界超级钢技术前沿水平的系列钢种之一。耐候钢由普碳钢添加少量铜、镍等耐腐蚀元素而成，具有优质钢的强韧、塑延、成型、焊割、磨蚀、高温、疲劳等特性；耐候性为普碳钢的2~8倍，涂装性为普碳钢的1.5~10倍，能减薄使用、裸露使用或简化涂装使用。该钢种具有耐锈，使构件抗腐蚀延寿、减薄降耗，省工节能的特性，使构件制造者、使用者受益。产品供制造集装箱、铁道车辆、石油井架、海港建筑、采油平台及化工石油设备中含硫化氢腐蚀介质的容器等结构件。