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Casting raw and auxiliary materials

  Raw sand

  Foundry sand is original shape (core) with a basic material, which is the most widely known as silica sand quartz sand, quartz sand than the original sand known as special sand, including: zircon sand, sintered magnesite, chromite sand, magnesium olivine sand, kyanite sand, limestone sand, graphite sand, artificial Baozhu sand.

  {Size, clay content, moisture content, containing powder amount} (the original sand bags to the second floor, plastic film, outer braid, with warranty book, pay attention to moisture during storage, debris can not be mixed (indoor).)

  Reclaimed sand

  Foundry treated largely restored performance can reuse old sand. {Burning reduction, including the amount of fines, sand temperature, strength, size average fineness} (reclaimed sand can not be mixed with other debris, waste, etc., should pay attention to water)


  Tensile strength (MPa), viscosity (MPa.S, nitrogen content, free formaldehyde, PH value, color and purity, moisture)


  Total acidity, viscosity, color and purity, strength, free sulfuric acid

  Resin sand Crystrip plastic pellets are made of a thermoplastic acrylic or polymeric particles made of thermosetting amines, particulate design corner for most of the dry strip surface coating, provides effective treatment methods. Crystrip plastic is chemically inert, through proper use and recycling, this dry-strip way to reduce harmful waste, reduce environmental pollution.

  Organic solvent coatings

  Viscosity, suspension rate, coating abrasion, brushing performance, paint is dry, the fire resistance

  Ferrosilicon is used as inoculant and nodulizer in the iron industry. Cast iron is an important modern industrial metal material, it is cheaper than steel, easy to melt smelting, casting with excellent performance and better than steel seismic capacity.

  In particular ductile iron, its mechanical properties at or near the mechanical properties of the steel. Adding a certain amount of ferrosilicon in cast iron can prevent the formation of iron carbide and promote the precipitation of graphite and the ball, and thus in the production of ductile iron, ferrosilicon is an important inoculant (help precipitate graphite) and Nodulizer .

  Iron boron added steel 0.07% B can significantly improve the steel hardenability. Boron is added 18% Cr, 8% Ni stainless steels can be treated precipitation hardening, improving high-temperature strength and hardness. In cast iron boron can affect graphitization, thus increasing the depth of it chilled white wear. Join 0.001% to 0.005% of boron in malleable iron, ductile advantageous form and improving their distribution. Current low aluminum, low carbon boron iron is the main raw material of amorphous alloys. According to GB5682-87 standards, China boron iron into two types of low-carbon and carbon eight grades.

  According to carbon content, iron boron (boron content: 5-25%) can be divided into low-carbon (C≤0.05% ~ 0.1%, 9% ~ 25% B) and carbon (C≤2.5%, 4% ~ 19 % B) two kinds.

  Iron boron steel production is strong deoxidizing agents boron added agent. The maximum effect of boron in steel is only a very small amount can significantly improve the hardenability and replace a large number of alloying elements, the other can improve the mechanical properties, cold deformation properties, weldability and high temperature properties.

  Boron cast iron can improve toughness, wear resistance, there are widely used in automobiles, tractors, machine tools and other manufacturing.

  Ferromolybdenum: consisting of molybdenum and iron alloy, molybdenum alloying additives generally 50 to 60 percent, used steel-making. Molybdenum iron molybdenum and iron alloys. Its main use is in steelmaking as molybdenum added agent. Steel added molybdenum steel can have a uniform fine grain structure, and improve the steel hardenability, helping to eliminate temper brittleness. High-speed steel, molybdenum can replace a portion of tungsten. Molybdenum alloying elements fit together with other widely used in the production of stainless steel, heat-resistant steel, acid-resistant steel and tool steels, and alloys with special physical properties. Plus molybdenum to increase its strength and wear resistance in cast iron inside.

  Refractory mud: the refractory powder, binders and additives composition. Almost all are made of refractory materials used to formulate refractory clay powder used. To add the amount of plastic powder clinker refractory clay as binder and plasticizer made of said common refractory clay, its low temperature strength, high temperature ceramic bond is formed that has the higher strength. With hydraulic, gas or thermosetting rigid bonding material as a binding agent, said chemical binding refractory clay, which produce a certain chemical reaction before the formation of the ceramic bonding temperature lower than hardened. Refractory clay particle size varies according to application requirements, the ultimate particle size generally less than 1mm, some less than 0.5mm or finer. Refractory mortar material selection should be considered consistent with the refractory products masonry material. Clay refractory material except for masonry joints, but also can be used smear method or spraying method is used as a protective coating lining body.

  Refractory mud characteristics and applications: 1) plasticity, easy construction; 2) large bond strength, high corrosion resistance; 3) relatively high refractoriness up to 1650 ℃ ± 50 ℃; 4) Slag Corrosion resistance; 5 ) and good thermal spalling. Refractory clay is mainly used in coke ovens, glass furnaces, hot blast furnace.

  Firebrick: Refractory materials are generally divided into two types, namely, unshaped refractories and stereotypes refractories. Unshaped refractory castable is also called, is a mixture of powdered material from a variety of aggregate particles or aggregates and one or more sticky and agent consisting of one or more liquid must be stirred evenly when used with having strong liquidity. Unshaped refractory bricks generally refers to its shape standard rules to be processed in accordance with the time required to build temporary cut.

  Firebrick referred brick. Refractory clay or other refractory materials refractory fired into

  Pottery clay

  Refers to the clay contains iron and with brown, gray, red purple hue, with good plasticity.

  Hong Coal

  Is the project company for the casting green sand casting production of products, the choice of coking coal and fat coal washed off as raw materials to produce pulverized coal.


  1) In the high temperature molten iron pulverized produce large amounts of reducing gas to prevent oxidation of molten iron, and iron oxide surface reduction, reduction of metal oxides and sand possibility of chemical reaction. Cavity reducing gas mainly from pulverized coal pyrolysis of volatiles, including carbon and water at a high temperature water gas reaction of hydrogen.

  2) pulverized coal heating begins to soften, with plasticity. Reducing casting defects due to thermal expansion of the sand produced.

  3) produce gas, liquid after pulverized coal is heated, the solid-phase of gelatinous body, gelatinous body volume expansion partially clogged pores between sand grains, so iron is not easy to penetrate.

  4) Volatile hydrocarbons casting machine generated when heated pulverized coal (mainly aromatic hydrocarbons) is divided at 650 ℃ -1000 ℃ high temperature, gas pyrolysis occurs in a reducing atmosphere in the molten metal and mold interface the precipitation of fine crystalline carbon layer with a shiny, called lustrous carbon. This layer of sand is not so lustrous carbon molten iron to sand wet and difficult to penetrate the pores, resulting in smooth surface of the casting.

  Uses: For casting machine enterprises to adopt the technology of wet-type casting of cast iron, can prevent type chemical sticky sand, improve the surface quality of the casting.

  Cupola melting: the cupola for the Company ordinary gray cast iron, cast iron and ductile iron smelting breeding

  Pig iron is a carbon content greater than 2% of the iron-carbon alloys, the carbon content of pig iron industry is generally 2.11% - 4.3%, and containing C, SI, Mn, S, P and other elements, with iron ore by blast furnace product. According to the different forms of pig iron in the presence of carbon, can be divided into steel-making pig iron, cast iron and ductile iron and so are several. Pig performance is hard, wear-resistant, casting is good, but the iron brittle, not forging.

  Nodulizer: make spherical graphite cast iron precipitated iron additive.


  1) Magnesium nodulizer. Magnesium-ball elements, such as pure magnesium metal, nickel alloys, copper and magnesium alloy.

  2) Rare earth nodulizer. Si-Mg alloy containing rare earth elements, is divided into common and rare nodulizer ytirium Nodulizer. Ingredients: magnesium, rare earths, silicon, calcium, barium, iron and so on.

  Magnesium content of 4%, 5%, 5.5% belong to low magnesium ball agent, RE between 1% -2%, and more for intermediate frequency smelting furnace, sulfur liquid iron ball handling. It has the advantages of mild reaction ball, ball elements easy to fully absorb. Magnesium content of 6% and 7% are in magnesium Series ball agent, used for cupola, electric furnace duplex melting, or intermediate frequency furnace melting pearlite cast ductile iron castings. According to the original hot metal casting wall thickness and sulfur content, to determine the appropriate amount of ball agent for a wide range, the ball wide of the treatment process. High magnesium series nodulizer for cupola melting, the sulfur content of 0.06% -0.09% iron was added in an amount between 1.6% -2.0%. Nodulizer low aluminum used in the prone pinhole defect castings and aluminum content of liquid iron castings required. After the pure Ce, La pure production nodulizer, ball handling liquid iron inclusions less pure graphite ball round. Ytirium production Nodulizer suitable for large cross section castings, slow ball recession, prevent massive graphite. Sb containing nodulizer for pearlite ductile iron. Low silicon nodulizer apply to use a lot of back charge of foundries; nickel-magnesium ball agent is used in high nickel austenitic ductile iron.

  Inoculant: inoculant is a kind of promotion of graphite, and reduce the chilling tendency, improving graphite morphology and distribution, increasing the number of eutectic, fine matrix structure, which in a short time after inoculation (about 5-8 min) with good results. Mainly applicable to all kinds of situations are generally natural elements or late instantaneous bred.


  1) Daobao bred: the inoculant added to the package, then into the molten iron, so that a homogeneous melt, you can cast.

  2) adding an amount of about 0.1% by weight of the liquid iron.

  Scrap: steel mill production process does not become a product of the iron and steel scrap (such as trimming, cutting class) and equipment scrapped after use, members of steel materials, components of steel called scrap; component is called pig iron scrap, collectively scrap. Currently the world's total scrap produced annually by 3 to 400 million tons, accounting for about 45 to 50 percent of steel production, of which 85 to 90% for steel-making raw materials, 10 to 15% for casting, iron and recycled steel

  Ferrite: the α-Fe and using it as the basis of a solid solution, having a body-centered cubic lattice

  Austenite: dissolving an interstitial solid solution of carbon in γ iron formation, it was a face-centered cubic structure, non-magnetic. Austenitic steels at elevated temperatures are generally organizations which there is a certain range of temperature and composition

  Cementite: C in the iron precipitation and solid solution saturated with iron formation.

  Pearlite: Is eutectoid ferrite and cementite austenite (carbon dissolved in austenite γ-Fe in interstitial solid solution) occurs eutectoid transformation formed. Named after its pearls (pearl-like) luster. Its shape ferrite thin and cementite alternately stacked thin layered composite material, also known as lamellar pearlite. Represented by the symbol P, the carbon content of ωc = 0.77%

  Ledeburite: cementite and austenite mechanical mixture (carbon 4.3%).

  Ferritic, austenitic have good ductility, toughness, pearlite has high mechanical properties; ledeburite is brittle, high hardness, good wear resistance. The steel in the solid state in a certain way for heating, insulation, cooling and then take appropriate way, organizational structure and properties of the process can be obtained needs.

  Ledeburite \ cementite are brittle, high hardness, good wear resistance; pearlite sorbite relatively higher mechanical properties; martensite divided into two kinds: low carbon M has a high strength and toughness , high carbon M has a higher wear resistance; troostite smaller than the lamellar spacing sorbite and higher yield strength, better flexibility.

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