Botou Junteng Casting Co.,Ltd

Park seats are being placed in more and more public places for people to relax and entertain. So, how many types of park seats are there? Xiaobian will take everyone to understand, park seats are divided into several categories: First, the legs of the park seat: 1. Steel feet are made of steel plates or steel pipes by stamping and welding. These types of chairs have high strength, simple and modern shapes, and the surface of the steel structure has been improved by pickling, phosphating, and plastic spraying. But the useful life is shorter. 2. Cast iron feet are mostly made of gray cast iron. There are also some  ductile iron bench leg s. After processing, the surface is a bit rough and the surface coating technology is slightly poor. Usually five to ten years. 3. Cast aluminum feet, due to the injection molding process, the product surface is relatively delicate, lightweight, assembly accuracy is higher than cast iron feet, anti-corrosion and rust, is a high-end product...

Ductile iron manhole covers are mainly made of spheroidal graphite cast iron. The quality of such manhole covers is related to the problem of nodularity. The commonly used coating for processing castings is rust-proof asphalt paint. Of course, the surface of nodular cast iron manhole covers is also spray-treated with rust-proof asphalt paint. The nodular cast iron manhole cover has an advantage, because the nodular cast iron manhole cover has a high strength and good toughness, which makes the nodular cast manhole cover 30% lighter than the same type of gray cast iron manhole cover. Features of  Ductile Iron Manhole Covers : Good toughness. The impact value is similar to that of medium carbon steel, and is more than 10 times that of gray iron material. Strong corrosion resistance. In the water spray corrosion test, the corrosion amount in the 90-day period is only 1/40 of the steel pipe, which is 1/10 of the gray iron pipe. The service life is 2 times that of gray iron pipes...

Local pitting defects of nodular cast iron parts generally appear at the concave corners of the upper surface of the casting and consist of many pits. The shape of the pit is a circular or irregular polygon, and its diameter is mostly between 1 and 3 mm. Gray oxides remain in many places on the pit wall, and graphite is not in the form of spheres but in the form of fine flakes or dots near the pits. Cause analysis (1) Molding sand There are three types of molding sand used in the  custom cast iron bench leg factory 's production, namely wet molding sand for small molding machine molding, wet molding sand for semi-automatic molding line (FBM) and self-hardening resin sand for resin sand production line. After analysis, it is found that local pitting defects mostly occur on castings produced by FBM production lines, and castings produced by small machine modeling rarely show such defects, even if they are relatively light, and such defects are found on resin sand castings. Nev...