What is a SPA-H

Weather plate is also called Corton steel, container, power plant, chimney, railway engineering and other outdoor steel such as large outdoor sculpture with steel, weather plate (namely atmospheric corrosion resistance steel) is between ordinary steel and stainless steel low alloy series of inexpensive and good quality. Compared with ordinary carbon steel, weathering plate has better corrosion resistance in the atmosphere. General carbon steel late maintenance costs are 1.5-2 times of weathering steel, weathering steel can reduce environmental pollution. Weathering steel products are used to manufacture containers, railway vehicles, oil derricks, port buildings, oil production platforms and containers containing hydrogen sulfide corrosive media in chemical and petroleum equipment.

• High weathering steel, weathering steel is a small amount of copper in steels, phosphorus, chromium, nickel element, in the protective layer is formed on the metal surface of the collective, can also add a small amount of molybdenum, niobium, vanadium, titanium, zirconium, such as elements, with fine grains, increase mechanical properties of the steel, improving steel strong toughness, reduce the brittle transition temperature, has the better performance of resistance to brittle fracture.

• Weather-resistant steel for welding structure, the element added to the steel grade, except for phosphorus, is basically the same as high weather-resistant structural steel, its role is also the same, and improve the welding performance.

The use of high weatherability structural steel because of its atmospheric corrosion resistance is better than welding structure weatherability steel, mainly used in vehicles, containers, buildings, towers and other structures with the bolted, riveted and welded structural parts. When welding structural parts, the thickness of steel should not be greater than 16mm. The welding performance of weathering steel for welding structure is better than that of high weathering structural steel, and it is mainly used for welding structural parts of Bridges, buildings and other structures.

Working principle of weathering steel

For weathering steels, the rusting process produces a stable rust layer of specific alloying elements that is attached to the base metal and has far fewer pores. This rusting "copper rust" forms under alternating wetting and drying conditions, forming a protective barrier that prevents oxygen, moisture and contaminants from further entering at a much lower corrosion rate than normal structural steel. In the right conditions, weathering steel will form an attached protective rust "copper rust" that inhibits further corrosion. Bridges manufactured from painted weathering steel can reach a design life of 120 years, providing an attractive economic solution with very low maintenance costs.

Weathering steel manufacturing process

Weathering steel generally adopts the process routes of concentrate feeding - smelting (converter, electric furnace - microalloying treatment - argon blowing -LF refining - low superheat continuous casting (feeding rare earth wire)- controlled rolling and controlled cooling. In smelting, scrap steel along with the charge into the furnace, according to the conventional process smelting, steel after adding deoxidizer and alloy, molten steel after blowing argon treatment, then casting, blowing argon temperature after the molten steel cast slab by continuous casting machine. With the addition of rare earth elements, the weathering steel is purified and the inclusion content is greatly reduced.

Weathering steel application

• Art and Sculpture: It became a popular material for outdoor art projects and is now commonly used in outdoor sculpture.

• In the garden: especially in the home garden as an alternative to concrete walls.

• Visual screen: used as cladding material for structures and fences.

• Exterior siding: When air gaps are allowed, air can flow between the exterior siding and the structure, protecting it from rain and subsequent water damage while remaining separate from the building structure.

General requirements for acceptance

• Each batch of steel plate delivered must have a quality assurance document, the type of inspection document should be in accordance with ASTM A6M and other provisions, clear handwriting without alteration marks.

• Deviation of size, thickness and length of steel plate within allowable deviation

• Also pay attention to plate surface flatness, plate waviness, appearance and corrosion grade

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• Timely delivery, abundant spot inventory, 100 distribution personnel for your service.

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