Two basic specialties of stainless steel casting process

Because the shortening of fine casting of stainless steel is much greater than that of cast iron, in order to avoid the defects of shrinkage and porosity, riser, chill and subsidy are mostly used in casting technology to complete sequential condensation. In order to avoid shrinkage, porosity, porosity and cracks in stainless steel casting, uniform wall thickness, sharp and right angle structure,lujianshi.75ix.com liujiaomoju.75ix.comhuafenchim.75ix.com gelidun.75ix.com yadingmoju.75ix.cn liushui.75ix.cn sawdust addition in moulding sand, coke addition in moulding core, and hollow core and oil sand core selection should be made to improve the concession and permeability of sand moulds or cores. Due to the poor fluidity of molten steel, in order to avoid cold insulation and lack of pouring, the wall thickness of steel castings should not be less than 8 mm; dry or hot casting models should be selected; proper pouring temperature should be improved, generally from 1520 to 1600 C. Due to the high pouring temperature, the superheat of molten steel is high, and the time to keep liquid is long, so the fluidity can be improved. However, too high pouring temperature can cause coarse grain, hot cracking, porosity and sand sticking. Therefore, the pouring temperature of fine castings with small size, thin wall and disorderly shape is about steel melting point temperature + 150 C; the structure of the pouring system is simple and the cross-section size is larger than that of cast iron; and the pouring temperature of large and thick-wall castings is about 100 C higher than that of cast iron.

评论

发表评论

此博客中的热门博文

Artificial aggregate production process and advantages and disadvantages

Wool sand making machine by crushing, screening, grinding, washing the resulting sand and gravel. In the absence of natural sand areas, often using artificial aggregate pouring concrete. Artificial aggregate production process are: wool mining, processing coarse aggregate, fine aggregate processing, screening, after washing reserves and transportation. Advantages of artificial aggregate are: ① wool stope nearest arrangements, reduce storage, loading and transport links, saving investment; ② to adjust production mix than the aggregate of all levels make full use of wool, save mining cost; ③ artificial aggregate particle size distribution is good, save cement, fresh surface roughness to increase bond strength, good mechanical properties. The disadvantage is the need to increase drilling blasting, crushing, sieving, washing, sand and other processes, the process is cumbersome, install more equipment and a greater direct costs of the system. Wool sand by crushing, screening, grinding, wa...
阅读全文

Raymond Mill grinding system new advantages

Raymond Mill is a kind of grinding equipment that we commonly use in industrial ultrafine mill . It is suitable for limestone, calcite, marble, talc, gypsum, barite, fluorite, zeolite, manganese ore, ilmenite, phosphorus Minerals, bentonite, starch, kaolin and other stones with a hardness of less than Mohs 7 are ground and used in a wide range of applications, all of which are inextricably linked to its new grinding system. So what technology is applied to the grinding system used by Raymond Mill? 1. The new technology adopts a new vertical roll device. The grinding roller and the grinding ring are always in balance during the grinding process to form a uniform line contact grinding zone. The height of the grinding roller and grinding ring is increased from the original 160 mm to 200 mm, which increases the grinding contact area to a greater extent. 2. The classifier adopts a forced turbine classifier to extend the granularity of the finished product from the original 80-325 mesh range...
阅读全文

New sand maker consolidates infrastructure construction

Since the 18th National Party Congress, our country has been inclined tocontinue to invest heavily in infrastructure to promote economicbooming, which will further expand the market demand for vsi sand making machine and gravelaggregate. In the face of the huge gravel aggregate demand, it isnecessary for gravel equipment R D manufacturer to activelyprepare for high-tech sand making machine to help the rapid development of economy. Sand making equipment is the key to the production of high-quality sandand gravel aggregate, the quality of sand and gravel aggregates directlyaffects the quality of infrastructure works. For a long time, theoverall technical level of sand making is low; facing increasinglystringent technical and quality requirements in the market, China sandmaking machine manufactures require to take active innovation, furtherincrease R D investment on technological application to meet thehigh standards and high demand of the market. Hongxing machine deeply understands...
阅读全文