The machine vision technology can realize the inspections of hot rolled sheet product such as flatness, head shape, oxide skin thickness, billet convexity after rough rolling, billet size, billet deflection, product shape between finishing stands, in-line finishing roll roughness, and flat shape, whole inspection efficiency and data consistency can be greatly improved. In cold…
Longitudinal cracks on the surface of the continuous casting billet are due to the unevenness of the thickness of the primary billet shell on the bending moon surface of mould, which acts on the tensile stress of the billet shell exceeding the allowable strength of the steel, leading to fracture at…
In the drawing process of steel wire, the iron oxide (scale) on the wire surface must be removed thoroughly to have good surface finish of the wire product, that can reduce the loss of drawing die loss. The scaling of metal wire is done by chemical, mechanical and photoelectric methods.…
Phosphorus and sulfur content have both favorable and adverse effects on the properties of steel. Phosphorus is a highly efficient solution-strengthening element that has little effect on the formability of cold-rolled steel plates. In continuous casting and heat treatment, phosphorus and sulfur are easily segregated and lead to embrittlement, which the…
Oxygen gun technology can improve the dynamic conditions of slag-steel and dephosphorize fast. Meanwhile the use of oxygen gun can shield the radiation of arc light on furnace lining, that is beneficial to increase the electric heating efficiency and shorten the smelting time. There are coherentjet oxygen gun or EBT oxygen gun frequently used in EAF steelmaking process.…
In 1950, China’s steel production was only 610,000 tons. In 1960, China’s steel production reached 18.66 million tons In 1980, the national steel production reached 37.12 million tons. In 1991 steel output came up to the 70 million ton. In 1996, China’s steel production exceeded 100 million tons. Since then,…
Stainless steel is divided into: ferritic stainless steel, austenitic stainless steel, martensitic stainless steel, austenitic-ferritic duplex stainless steel, precipitation hardening stainless steel (PH) according to the organizational structure characteristics. 300 series stainless steel are chromium-nickel austenitic. 301 SS is good ductility, good weldability, better wear resistance and fatigue strength than…
Scientists have never stopped researching and exploring better metal forming processes, which can be easily applied, simple and efficient, and can ensure the performance requirements. As far as now, there are eight kinds of metal forming processes being commonly used for various purposes. 1.Casting Liquid metal is poured into the…
Amorphous alloys are new metallic materials that combine the properties of glass, metal, solid and liquid substances. The structure of amorphous alloys is characterized by long-range disorder, short-range order, macroscopic homogeneity and isotropy, and short-range inhomogeneity. Currently common methods for determining the amorphous structure such as X-ray diffraction, neutron diffraction,…
Presently in steel sector, there are a batch of crucial technologies of green production under developing, mahufacturing process of steel plants shall be more green and low emission, that greatly surroundings and society. 1. High proportion of rich hydrogen sintering technology 2. Low carbon iron ore sintering technology 3. High proportion of pellets…
