Corten steel difference

The main building surface of the Luxembourg National Pavilion of the World Expo is rust-colored and made of a special steel with atmospheric corrosion resistance. After adding phosphorus, copper, chromium, nickel and other trace elements into the steel, this material will be exposed to the air, and the surface will automatically form an amorphous spinel-type oxide anti-corrosion protective layer, without coating protection, and the service life of the material will be more than 80 years. In addition, the weathering steel used to build the entire Luxembourg Pavilion can be recycled 100% after the removal of the pavilion. Behind the rusty spots, it shows the concept of innovation and environmental protection of the Luxembourg Pavilion, showing a sense of history. In addition to the Luxembourg Pavilion, the exterior walls of the Australian Pavilion and the Chilean Pavilion are also partially made of atmospheric corrosion resistant steel (Cowton steel), commonly known as rust plate.

With the increasing demand of weathering steel plate in the field of modern architecture and sculpture, what has no difference in appearance before rust, and affects the cost and later use effect, how to identify the type of steel is particularly important, so how to identify weathering steel plate and ordinary carbon steel for remote sculpture?

1、 In the first stage of stainless steel plate, the weathering steel plate and ordinary carbon steel plate cannot be distinguished by the naked eye. It is necessary to refer to the warranty of the steel factory. The warranty requires the original of the dealer's red seal to avoid being replaced with inferior ones.

2、 In the second stage of steel plate long rust (1-3 months outdoors), the genuine weathering steel began to grow small rust spots, and the rust spots of ordinary steel plates were relatively scattered, and some of the rusty steel plates were poorly treated and even bulged;

3、 In the third stage of long rust of steel plate (4-8 months outdoor), the authentic weathering rust steel plate has less rust water, and the rust spots are small and thick; Ordinary steel plate has more rust water, and the rust spots are large and thin; Ordinary steel plate has more serious rust marks, and the workpiece has signs of blackening;

4、 In the fourth stage of steel plate long rust (more than 8 months outdoors), the authentic weathering steel has a clear and dense rust core sand layer, and the rust spots are closely adhered to form a protective layer, which can hardly be removed by hand wiping; Ordinary steel plate has a large amount of rust, even serious rust unevenness, peeling of the whole rust scale, and steel plate rust penetration. Genuine weathering steel is inclined to reddish brown, and ordinary steel plate is inclined to dark black.