1. Technical Difficulties
(l) Oxidation of molten iron, which chemically reacts with oxygen in the air to form a stable oxide during melting, which will seriously jeopardize the quality of the molten iron, including element burning, pore slag, and white mouth tendency.
(2) Because the cast iron scraps are in the form of broken ends, the outer surface contains a thin layer of iron oxide, the bulk density meter is 2g/cm3, the content of iron oxide is high, and the erosion of the acid lining is easy to be accelerated, the thickness of the lining cannot be displayed, and the lining is too thin and easy to produce. Leakage accidents and safety monitoring techniques during the melting process are particularly critical.
(3) All grades of cast iron parts require precise pre-furnace batching to ensure that the proportion of each component of the charge is reasonable.
2. Key technology
(l) Develop a special chip cake machine to compress low-density cast iron chips into cakes to improve the melting efficiency, that is, reduce the oxidation area and improve the magnetic permeability in the furnace.
(2) Since the melting temperature of cast iron chips is about 100 °C higher than that of ordinary bread iron, in order to ensure safe melting, the relative change relationship between the current frequency and voltage of the electric furnace is used, and the thickness of the lining is calculated by computer technology to prevent the furnace lining from being thin and leaking. accident.
(3) Optimize the design of the power supply configuration and the furnace structure, improve the power utilization rate, improve the melting efficiency and quality, and supply the molten iron rhythmically according to the requirements of the casting line.
(4) In order to improve the oxidation resistance of cast iron scraps and scrap scraps, the protection methods and control methods of electric furnace smelting gas are studied.
Stainless Steel Flange
A flange can also be a plate or ring to form a rim at the end of a pipe when fastened to the pipe. A blind flange is a plate for covering or closing the end of a pipe. A flange joint is a connection of pipes, where the connecting pieces have flanges by which the parts are bolted together.
Although the word flange generally refers to the actual raised rim or lip of a fitting, many flanged plumbing fittings are themselves known as 'flanges':
There are many different flange standards to be found worldwide. To allow easy functionality and interchangeability, these are designed to have standardised dimensions. Common world standards include ASA/ASME (USA), PN/DIN (European), BS10 (British/Australian), and JIS/KS (Japanese/Korean). In the USA, ANSI stopped publishing B16.5 in 1996, and the standard is ASME B16.5
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