Welded Weathering Steel Q415NH

Product name: welded weathering steel
Mark: Q415NH
Specifications (mm) : Thickness : 10 -50; Width: 1800-2700; length L: 6000-12700
Executive Standard: GB/T 4171-2008
Product application scope:
Comprehensive performance, good weldability and low temperature impact toughness, suitable for architecture, artifacts such as weather resistance of weldments

Principle of weathering steel
Adding phosphorus, copper, chromium, nickel and other trace elements can form a density and adhesion strong protective film on the steel surface that can hinder the spread inside and development of corrosion, rust so that protect layer below the substrate, to slow down the corrosion rate.
The amorphous spinel and dense oxide layer formed between the layer and the substrate of about 50 microns to 100 microns thick is substrate metal stick fine. The oxide film layer prevents the oxygen in the atmosphere and water infiltration to the steel matrix, and slow down the corrosion to steel material depth development, greatly improve the atmospheric corrosion resisting capacity of steel materials.Weathering steel is used thinning, nudity or simplified coating so that can save work and make the products against corrosion prolong life, consumption and upgrading of the steel, is also a new mechanism can be integrated into the modern metallurgy, new technology, new technology and the sustainable development and innovation of steel.

Weathering steel manufacturing craft
Weathering steel manufacturing craft is as following:materials into the furnace - rolling melting (smelting converter, electric furnace - micro alloying - blowing argon - LF refining - low superheat casting (feeding rare earth wire) - controlled rolling controlled cooling technology, etc. In the smelting, steel scrap with charge to join in furnace, according to the conventional process of smelting, the steel after add deoxidizing agent and alloy, steel after argon blowing process, then to casting, after blowing argon temperature of the molten steel by continuous casting machine cast slab. Because of adding rare earth elements in steel purified weathering steel, inclusion content is greatly reduced.