subject: State Of Gray Cast Iron Pipe Fittings Weight [print this page] State of gray cast iron pipe fittings weight
--- Pipe cast iron pipe system using socket type or clamp-type centrifugal casting process using a flexible interface to the production of cast iron drainage pipe
1999 years ago, the State Department "article 72" was released, following everywhere: out of cast iron pipe (in some places also specify that include ductile iron pipe). For a time the site is no longer used cast iron pipes, pipe out not
The factory and sold it to the site of the iron pipe was returned. Cast iron pipes just so happens, on the one hand because some hand-shape production of cast iron pipe and pipe fittings roughness, people
Looked very uncomfortable. More importantly, some of the production process or the management behind the chaos of the manufacturers in order to obtain profits, the defective, waste "processing" after the sale as finished products, which greatly reduces the quality of the project.
Moreover, some factories cut corners to reduce costs, will become brittle within the organization, or a backward manual sand casting method, leading to uneven product thickness, or by simple casting obsolete equipment, process strictly
Lattice formation of casting defects, in transit or in whole or in part, thin-walled office, defects occurring at the fragmentation phenomenon. After the Chinese Society for Metals Cast Iron Pipe National Drainage efforts of the Committee. Introduced to promote the Ministry of Metallurgy for
Cast Iron Pipe "National Metallurgical Fake [1999] No. 128 document", document: Sub-regional cap out of rigid sand core casting of cast iron drainage pipe interface to promote the use of mechanism (centrifugal or continuous casting) Flexible Interface drainage cast iron
Pipe. Metallurgical Council of the views of four ministries and commissions of the Council later in document 295, cast iron drainage pipe formation of industrial policy played a very important role.
"Pai Authority" in the relevant sector support, through arduous efforts to catch the 295 before the introduction of a flexible interface to the preparation of publication of the relevant national standard cast iron pipes. And actively help the conditions of the manufacturers to step up
The product provincial technical appraisal. As the row of Authority to actively promote, in the subsequent meeting, organized by the Ministry of Construction in order to "cast iron drainage pipe" as the topic for discussion by experts at the National, formed a soft cast on the mechanism
Iron pipe very favorable public opinion, the experts agreed that: "cast iron drainage pipe flexible joint mechanism with the internationally advanced indoor water pipe, should be vigorously promoted green products." This
Meeting "minutes" became the basis for 295 one of the important document. Eventually by the Ministry of Construction, the State Economic and Trade Commission, Quality and Technical Supervision, Bureau of Building Material Bureau 295 four ministries document clearly states:
"Promote the use of line" with flexible cast iron drainage pipes and pipe fittings "(GB/T12772-1999) of the flexible joint mechanism for cast iron pipes."
Cast iron drainage pipe in China has made considerable progress: from the first generation of RK-type flexible joint drainage cast iron pipe developed. Across the country to the second generation A-born, to the formulation of a national standard GB/T12772-91
Version. Mechanisms in recent years in particular, W-type flexible flat nose drainage cast iron pipe and the successful development of mass production, and has been with international standards, reached world advanced level.
2, on the cast iron pipe
Press materials will be divided into the gray cast iron pipe cast iron pipe and ductile iron pipe, into a continuous casting process by casting and centrifugal casting of cast iron pipe cast iron pipe, material and casting process determines the performance of cast iron pipe.
Performance of centrifugal casting ductile iron pipe cast iron pipe over the fine-continuous casting, continuous casting ductile iron pipe performance than gray cast iron pipes have a breakthrough to improve. Centrifugal casting cast iron ductile iron pipes both good corrosion resistance and
Good mechanical properties of steel, the overall economic cost of less than steel pipe, steel pipe service life of 3 to 5 times. Compared with gray cast iron pipe, continuous casting thin wall ductile iron, weight increase% of
, While centrifugal casting ductile iron wall thinner, more than 35% weight. Centrifugal casting ductile iron pipe manufacturing process are water-cooled metal mold, heat and hot mold resin sand mold coating method. The former process generally
For the production of DN 100 -1000 diameter pipe, the latter two processes is mainly used for production of DN 1000 - 2600 diameter pipe.
by: sanzhuang
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