1. what is malleable iron pipe fittings
Malleable iron is cast as white iron, the structure being a metastable carbide in a pearlitic matrix. Through an annealing heat treatment, the brittle structure as first cast is transformed into the malleable form. Carbon agglomerates into small roughly spherical aggregates of graphite, leaving a matrix of ferrite or pearlite according to the exact heat treatment used. Three basic types of malleable iron are recognized within the casting industry: blackheart malleable iron, whiteheart malleable iron and pearlitic malleable iron. learn more
Malleable iron pipe fittings are made of malleable cast iron. In simple terms, the production process is to first cast white iron into white cast iron castings, and then obtain malleable iron pipe fittings through a malleable annealing process.
What are malleable iron pipe fittings used for? Malleable iron pipe fittings widely exists in our daily life, it is suitable for petroleum, chemical, electric power, construction, water treatment and other fields.
2. malleable iron pipe fittings specification
malleable iron chemical composition
wC=2.2%～2.8%,wSi=1.0%～1.8%,wMn=0.3%～0.8%,wS≤0.2%,wP≤0.1%
pressure rating of malleable iron pipe fittings
PN16/1.6MPA, PN20/ 2.0MPA
malleable iron pipe fittings standard
ASTM A 197, A 197M-2000, ANSI/ ASME 16.3-92/B1.20.1-83, EN1562:1997/ EN10242:2003, DIN2950/1692/2999, ISO5922/ISO49/ISO7-1/ISO228, Q/ JZ 01-2015(based on JIS B2301), GB/T3287-2011 ISO5922
malleable iron mechanical properties
tensile strength>=330MPa, elongation rate>=8%, hardness<=HB150hardness<=HB150
malleable iron pipe fittings dimensions
1/8″-8″, DN6-DN200
3. galvanized malleable iron pipe fittings vs black malleable iron pipe fittings
Due to its iron material, malleable steel pipe fittings are prone to rust when exposed to air. In particular, our malleable steel pipe fittings are mainly used in fire protection and water supply projects, and the pipe fittings are more likely to corrode when exposed to a humid environment for a long time. Therefore, the malleable steel pipe fittings need anti-rust treatment on the surface. The surface anti-rust treatment of malleable steel pipe fittings is generally divided into two types: hot-dip galvanizing and cold-dip galvanizing. Hot-dip galvanizing refers to a galvanizing treatment method in which the pipe fittings are immersed in a molten zinc solution at a high temperature of 700-800 degrees, so that the surface of the pipe fittings is covered with a layer of zinc. The principle of cold galvanizing is to rely on electrophoresis to transfer the zinc hanging on the anode to the surface of the pipe hanging on the cathode, thereby forming a thin and uniform layer of zinc.
The cost of hot-dip galvanizing is higher than that of cold-dip galvanizing, but hot-dip galvanizing has a thicker galvanized layer, and the surface zinc layer reacts with the iron matrix at high temperature, resulting in a mutual penetration between the zinc layer and the iron matrix. It is a transition layer, so the zinc layer is particularly firmly combined with the base of the pipe fitting, and it is not easy to fall off. Although the cost of cold galvanized layer is relatively low, the zinc layer is uniform and beautiful, but because electroplating only covers a layer of zinc metal film on the surface of the pipe base, the galvanized layer is thin and easy to fall off.
Black malleable iron pipe fittings are generally used in the environment of handicrafts and retro decoration.
4. malleable iron pipe fittings types and photos
4. hs code for malleable iron pipe fittings
HS code 8 digit of malleable iron pipe fititngs: 73079900
Click and view China Customs import and export policy for malleable iron pipe fittings.
5. malleable iron pipe fittings factory and manufacturers in china
The production bases of malleable iron pipe fittings in China are mainly concentrated in Shandong, Hebei and Shanxi provinces.