东莞市长安博扬金属材料有限公司

[Sales hotline: Li Ting
][
][
]
Dongguan ductile iron rod supplier, ductile iron material, ductile iron plate, ductile iron rod, Cast iron profiles, ductile iron prices, ductile iron manufacturers, ductile iron density, ductile iron hardness, how much does ductile iron cost per ton, ductile iron properties, gray cast iron, cast iron rods, gray cast iron plates, gray cast iron rods, chemical composition of gray cast iron, gray Cast iron density, gray cast iron material, how much is a ton of gray cast iron, high-precision ductile iron rods, high-density ductile iron rods, heat-resistant ductile iron rods, ductile iron plates. High temperature resistant ductile iron rods, alloy ductile iron rods, high toughness ductile iron rods, cast iron profiles. High strength ductile iron rod, high precision ductile iron rod, high toughness cast iron rod, high hardness ductile iron rod, cast ductile iron, heat-resistant ductile iron, high silicon heat-resistant ductile iron, medium silicon heat-resistant ductile iron. Ductile iron quotation, ductile iron market, ductile iron heat treatment hardness. Ductile iron tensile strength, ductile iron mechanical properties, ductile iron mechanical properties.
Ductile Iron
A general term for alloys mainly composed of iron, carbon and silicon. In these alloys, the carbon content exceeds the amount that can be retained in the austenite solid solution at the eutectic temperature. Cast iron is a general term for alloys mainly composed of iron, carbon and silicon. In these alloys, the carbon content exceeds the amount that can be retained in the austenite solid solution at the eutectic temperature.
Iron-carbon alloys with carbon content above. Industrial cast iron generally has a carbon content of ~. Carbon mostly exists in the form of graphite in cast iron, and sometimes in the form of cementite. In addition to carbon, cast iron also contains ~3% of silicon, as well as elements such as manganese, phosphorus, and sulfur. Alloy cast iron also contains elements such as nickel, chromium, molybdenum, aluminum, copper, boron, and vanadium. Carbon and silicon are the main elements that affect the microstructure and properties of cast iron.
Cast iron can be divided into
① Gray cast iron. The carbon content is high (.~.), the carbon mainly exists in the form of flake graphite, and the fracture surface is gray, referred to as gray iron. It has a low melting point (~℃), small shrinkage during solidification, compressive strength and hardness close to carbon steel, and good shock absorption. Used to manufacture machine tool beds, cylinders, boxes and other structural parts.
②White cast iron. The carbon and silicon content are low, carbon mainly exists in the form of cementite, and the fracture surface is silvery white. It shrinks greatly during solidification and is prone to shrinkage holes and cracks. It has high hardness and brittleness and cannot withstand impact loads. It is mostly used as a blank for malleable iron and to make wear-resistant parts.
③ Malleable cast iron. It is obtained after annealing treatment of white cast iron. The graphite is distributed in a floc-like form, referred to as tough iron. Its structural properties are uniform, wear-resistant, and has good plasticity and toughness. Used to manufacture parts with complex shapes that can withstand strong dynamic loads.
④ Ductile iron. Gray cast iron is obtained after spheroidizing the molten iron. The precipitated graphite is in the shape of spheroids, which is referred to as ductile iron. It has higher strength, better toughness and plasticity than ordinary gray cast iron. Used in the manufacture of internal combustion engines, auto parts, agricultural machinery, etc.
⑤Vermicular graphite cast iron. Gray cast iron is obtained after vermiformation treatment of molten iron, and the precipitated graphite is in the shape of worms. The mechanical properties are similar to ductile iron, and the casting performance is between gray cast iron and ductile iron. Parts used in manufacturing automobiles.
⑥Alloy cast iron. Ordinary cast iron is obtained by adding appropriate amounts of alloying elements (such as silicon, manganese, phosphorus, nickel, chromium, molybdenum, copper, aluminum, boron, vanadium, tin, etc.). Alloying elements change the matrix structure of cast iron, giving it corresponding properties such as heat resistance, wear resistance, corrosion resistance, low temperature resistance or non-magnetic properties. Used to manufacture parts for mining, chemical machinery, instruments, meters, etc.
Classification of cast iron
Classification method Classification name description
.Classified by fracture color
Gray cast iron Most or all of the carbon in this type of cast iron is in the form of free state flake graphite. , its fracture surface is dark gray, has certain mechanical properties and good cutting performance, and is widely used in industry
White cast iron White cast iron is an iron-carbon alloy with no or almost no graphite in the structure , its fracture surface is white and bright, hard and brittle, and cannot be cut. It is rarely used directly in industry to make mechanical parts. Because of its high surface hardness and wear resistance, it is also called chilled cast iron or chilled cast iron
Tackled cast iron Tackled cast iron is a kind of cast iron between white cast iron and gray cast iron. It is gray and white pitted, has poor performance and is rarely used
. According to chemical composition
Ordinary cast iron refers to cast iron that does not contain any alloying elements, such as gray cast iron, malleable cast iron, ductile cast iron, etc.< br/>Alloy cast iron is a high-grade cast iron prepared by adding some alloying elements to ordinary cast iron to improve certain special properties. Such as various corrosion-resistant, heat-resistant, wear-resistant cast irons with special properties
3. According to production methods and organizational properties
Ordinary gray cast iron, see gray cast iron
Breeding cast iron This is based on gray cast iron It is made of metamorphic treatment, also known as metamorphic cast iron. Its strength, plasticity and toughness are much better than ordinary gray cast iron, and its structure is also more uniform. Mainly used to manufacture large castings that require high mechanical properties and large changes in cross-sectional dimensions
Malleable cast iron Malleable cast iron is made of white cast iron with a certain composition and graphitized annealing. It has higher toughness than gray cast iron and is Called ductile cast iron. It cannot be forged and is often used to make castings that can withstand impact loads
Ductile iron is referred to as ductile iron. It is obtained by adding a certain amount of nodularizing agent and inking agent to the molten iron before casting to promote the crystallization of spheroidal graphite. Compared with steel, except for slightly lower plasticity and toughness, its other properties are similar. It is an excellent material that combines the advantages of steel and cast iron. It is widely used in mechanical engineering
Special performance cast iron This is a kind of cast iron with certain Characteristics of cast iron, according to different uses, can be divided into wear-resistant cast iron, heat-resistant cast iron, corrosion-resistant cast iron, etc. Most of them belong to alloy cast iron and are widely used in machinery manufacturing
Cast iron - heat treatment process
Stress relief annealing Due to the uneven wall thickness of the casting, effective stress and Tissue stress. In addition, large parts are prone to residual stress after machining, and all these internal stresses must be eliminated. The usual heating temperature for stress relief annealing is ~°C and the holding time is ~~ and then furnace cooling (gray iron) or air cooling (ductile iron). Using this process can eliminate the internal stress of the casting, but the cast iron structure will not change. If the temperature exceeds ℃ or the holding time is too long, it will cause graphitization and reduce the strength and hardness of the casting.
.High-temperature graphitization annealing to eliminate cast iron white spots
When castings are cooled, white spots often occur on the surface layer and thin sections. The white structure is hard and brittle, has poor processing performance and is easy to peel off. Therefore, annealing (or normalizing) must be used to eliminate the white structure. The annealing process is: heating to -℃, keeping warm, then cooling the furnace to -℃ and then leaving the furnace for air cooling. During the high-temperature insulation period, free cementite and eutectic cementite decompose into graphite and graphite. During the subsequent cooling process, secondary cementite and eutectoid cementite also decompose, and the graphitization process occurs. Due to the decomposition of cementite, the hardness decreases, thereby improving the machinability.
3. Normalizing ductile iron
The purpose of normalizing ductile iron is to obtain the pearlite matrix structure, refine the grains, and uniform the structure to improve the mechanical properties of the casting. Sometimes normalizing is also the structural preparation for surface quenching of ductile iron. Normalizing is divided into high-temperature normalizing and low-temperature normalizing. The high-temperature normalizing temperature generally does not exceed ~℃, and the low-temperature normalizing temperature is generally heated to the refractory temperature range ~℃. After normalizing, four people are generally required to handle it to eliminate the internal stress generated during normalizing.
.Quenching and tempering of ductile iron
In order to improve the mechanical properties of ductile iron, castings are generally heated to above 3~°C (representing the final temperature formed during heating), and then quenched into oil after heat preservation to obtain cast iron. body structure. In order to appropriately reduce the residual stress after quenching, tempering should generally be performed after quenching. The low-temperature tempering structure is tempered martensite plus residual bainite plus spherical graphite. This structure has good wear resistance and is used for parts requiring high wear resistance and high strength. The medium temperature tempering temperature is 3-℃. The structure after tempering is tempered troostite plus spherical graphite. It is suitable for thick parts that require good wear resistance, certain effectiveness stability and elasticity. Boyang Company-Relevant talents are mostly concentrated in the Steel Talent Network. The high temperature tempering temperature is ℃. The structure after tempering is tempered Soxhlet plus spherical graphite, which has a good combination of toughness and strength. The structure after tempering is tempered Soxhlet plus spherical graphite, which has a combination of toughness and strength. Good comprehensive performance, so it is widely used in production.
.Multi-temperature quenching of ductile iron
After isothermal quenching, ductile iron can obtain high strength and at the same time have good plasticity and toughness. The main consideration in selecting the heating temperature for multi-temperature quenching is to ensure that the original structure is completely intact and does not remain, and at the same time to avoid grain growth. The heating temperature is generally 3°C above, and the isothermal treatment temperature is 3°C to ensure that a lower bainite structure with comprehensive mechanical properties is obtained. After isothermal quenching of rare earth magnesium aluminum ductile iron b~,~3./,~. However, it should be noted that a tempering process is added after isothermal quenching.
.Surface quenching
In order to improve the surface hardness, wear resistance and fatigue strength of some castings, surface quenching can be used. Both gray cast iron and ductile iron castings can be surface quenched. Generally, high (medium) frequency induction heating surface quenching and electrical contact surface quenching are used.
.Chemical heat treatment
For castings that require surface wear resistance, oxidation resistance, and corrosion resistance, chemical heat treatment processes similar to steel can be used, such as gas soft chlorination, chlorination, boronization, sulfurization, etc. deal with.
Gray cast iron
BChina
Japan 3
South Korea 3
United States...3.3
.
United States
Ductile iron
br/> BChina
-
-
Japan
3----
-
South Korea 3
United States
United States
Application fields of cast iron profiles
Hydraulic
●Valves: stacked valves, combination valves, pressure reducing valves, relief valves, solenoid valves, base plates, hydraulic manifolds, etc.
●Cylinder: piston, top cover, hydraulic cylinder end cover, guide sleeve, etc.
Machine tools and general machinery
●Machine tools: side plates, rear plates, sleeves, pistons, cylinder end covers, pins, spring ferrules, jacket chucks, center points
Gears, bushings , flange, coupling, rack, chuck, dial seat, clutch, guide rail, etc.
●Injection molding machine: valve, manifold, cylinder, fixed side plate, movable side plate, injection molding plate, etc.
●Printing machinery: mixing ink roller, ink rail, guide plate, gear, etc.
●Civil machinery: valves, cylinder pistons, integrated blocks, etc.
●Textile machinery: gears, bearing housings, balance weights, conduits, bearings, cross slides, bearing bushes, cams, etc.
●Agricultural machinery: cultivator pulleys, pistons, top covers, bearings, combine harvester pulleys, etc.
Power equipment
●Automobile: shock absorbers, valves, ducts, mechanical seals, bushings, liners, balance weights, bearing bushes, etc.
●Shipbuilding: oil separators, cylinders, pistons, valve guides, engine valve stem sleeves, cylinder block components, etc.
●Overweight machine: pulleys, bushings, bearings, etc.
Electrical equipment:
Rotary air conditioning compressor roller bushings, bases, motor gears, refrigerator rotors, generator discs, etc.
Metal molds: glass, aluminum alloy, plastic, grinding wheels, pen tips, pressure casting, grinding lenses, cold core boxes, housings for analysis components, etc.
Pumps:
Gear pump gears, screw pump rotors, chemical pump shafts, seals, rotors, flanges, liquid flow controls, one-way valves, yoke sleeves, valve guides, etc.
General common parts:
Gears, pulleys, pulleys, bearings, shafts, bearing bushes, bushings, cams, couplings, flanges, balance weights, boxes, boxes, cover tips, seals , rollers, bases, ring nuts, flat plates, pins, squares, work card mold tips, etc.
Others:
Balance weight, stamping materials, oil seals, thermocouple protection tubes, feed rollers, rollers, spray gun internal gears, piston pins, grinding materials, roller covers, sampling boxes, guide rollers, connecting Casting machine rollers, cylinder barrels, cold iron, bottom plates, automatic valves, lock blanks, etc.
Features: Complete product specifications, favorable prices, intact packaging, pure copper, good straightness, large inventory, and material certification and reports can be provided.
Specifications can be customized. Boyang Company welcomes your calls and we will sincerely serve you.
Company-Boyang adheres to the enterprise spirit of sincere service and joint creation of the future, adheres to the business philosophy of people-oriented, science and technology to run factories, and has formed its own strong technical strength and advanced production technology. Continuing to focus on the eternal theme of first-class corporate services and superior product quality, we represent the brand of German SGL graphite products with a wide range of products. Our products are sold to major cities at home and abroad, and we enjoy a reputation among customers for our excellent service and superior quality. .
We also specialize in the distribution of mold steel, white steel products, tungsten steel, copper alloy, aluminum alloy and other non-ferrous metals imported from various countries.
We promise: Our previous exchanges and cooperation will provide you with more satisfactory and better products and services.
Our company Boyang seeks advantages with materials and supplies the market with scale. Sincerity, efficiency, positivity, and responsibility are our attitudes. The guarantee of materials, efficiency of supply, and customer trust are the foundation for us to establish a foothold in the market and create a new market. , our company guarantees the authenticity of the materials provided and comes with the goods with original material certificates and reports and other relevant information. We hope and strive to provide customers with long-term and timely supply resources, and strive to form stable friendship and cooperation with our customers to achieve a win-win effect.