Events Reasons Solutions 1 Rolled parts not bitten into the rolls and steels stacked The end part of a billet is forked To pick out unqualified billet The guide isn’t installed properly To Reinstall the guide The rolling piece in the guide orgroove is blocked To remove away obstructive Not polish new groove after replacenew groove. To polish new groove andregulate the rolling speed 2 Steels piled after the rolling piece have been bitten into the rolls The speed of rolling piece isn’t right. Correctly setting the speed Roll diameter input error To input the correct rolldiameter Tension setting is too small afterchanging rolls and grooves Increase the tension settingappropriately Incomplete grinding after changingnew groove Further grinding of the rolls 3 Steel stackeddue to steel jamming between rolls Motor overload,overspeed,and dropout Check steel temperature,roll size,rolling speed and electrical faults 4 Flying shear 1#,2#steel stacking Flying shear overrun speed is toolow Increase the overrun speedof flying shear Flying shear does not cut the head Check power supply,hotmetal detector Shear blade aging or poor overlap Replace shear blade,adjustoverlap Interrupt flying shear action Checking hot metaldetectors…
The rolling line of each stand should align in the same straight line so that is the production can normally work. If there is light offset of stand rolling line, the guide could be damage caused by uneven wear of the hole pattern; serious offset can directly cause the accident of steel stacking. The meaning…
Traditional top charging electric furnace, simple equipment, less investment in land area, flexible and simple operation, but its production process is not continuous, heat loss is large, the impact on the environment is large. Theoretically, the single furnace smelting cycle is 60min, electricity consumption is 400kWh/t, and electrode consumption is…
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…
