What is the process of bimetallic wear-resistant elbow and bimetallic wear-resistant steel pipe
KMTBCr28 lined with high chromium bimetallic wear-resistant pipe, bimetallic wear-resistant pipe fittings product introduction: KMTBCr28 inner High chromium lined bimetal wear-resistant pipes, bimetal wear-resistant elbows, bimetal wear-resistant tees, and bimetal wear-resistant reducers are made of high-chromium alloy materials and cast in one go through a special process. They are wear-resistant, corrosion-resistant, It has the characteristics of high temperature resistance and excellent thermal conductivity. It is an ideal pipe and fitting working under conditions of corrosion, erosion and high temperature. It can be used for a long time within 1100℃, the maximum working temperature is 1200℃, and its performance is stable.
Steel-high chromium nickel molybdenum rare earth alloy bimetal wear-resistant pipe product is a new type of wear-resistant pipe with domestic advanced level. It uses steel pipe as the base and is lined with super wear-resistant alloy materials. The wear-resistant lining layer is a highly wear-resistant alloy material melted by an intermediate frequency electric furnace. It is evenly compounded on the inner surface of the steel pipe through centrifugal casting to form a strong metallurgical combination. The elbow adopts vacuum lost foam casting process.
Steel-high chromium nickel molybdenum rare earth alloy bimetallic wear-resistant pipe products have extremely high mechanical strength and impact resistance; the inner lining wear-resistant layer uses the anti-wear alloy steel series independently developed by our company, which is mainly Adding Cr-Ni-Mo-Cu-RE and other alloys, through a special proportion of formula, and a quenching and tempering heat treatment process, the alloy steel has strong wear resistance and corrosion resistance, as well as high mechanical strength and resistance. Impact performance. Our company's complete set of processes is the first of its kind in China, filling the gap in my country's anti-corrosion and wear-resistant industrial transmission pipelines, and has reached the international advanced level. It has been widely used in mining, metallurgy, coal, electric power and other industries. It is an ideal wear-resistant pipeline. .
Characteristics of centrifugal casting of bimetal wear-resistant elbows:
(1) The centrifugal casting process is to solidify the molten steel under gravity conditions that are dozens of times higher than conventional casting. , which effectively solves the problem of looseness inside the as-cast tube blank, has high metal density, and has good slag removal and exhaust effects.
(2) The centrifugal cast pipe has high dimensional accuracy and uniform wall thickness, which provides a favorable guarantee for the dimensional accuracy of subsequent processed products.
(3) The centrifugal casting process has high flexibility for the production of steel pipes in small batches, multiple varieties and specifications, high quality, and high value-added steel.
Wear-resistant and heat-resistant alloy steel products not only have excellent wear resistance, high temperature resistance and impact resistance, but also have good toughness, excellent mechanical and thermal shock resistance, and good weldability. Easy to install. Especially suitable for wear and impact in high cold and high temperature environments. Such as material transportation in electric power, metallurgy, coal, mining, cement and other industries. Compared with other wear-resistant pipes, this product has a long service life and economical investment cost.
1. Good comprehensive performance
Wear-resistant and heat-resistant alloy steel products are made using special casting processes. Their metal structures are dense and uniform, without casting defects such as slag inclusions and shrinkage cavities. It not only has the wear resistance and corrosion resistance of high alloys, but also has high mechanical strength, impact resistance and fatigue resistance, as well as good weldability. The outer wall of the composite pipe is made of steel pipe, and the inner lining is made of high-chromium wear-resistant alloy materials (16Mn, 40Cr, high-chromium cast iron Cr and Cr28 series). The two form a good metallurgical combination, and have the wear-resistant properties of high-alloy materials. , corrosion resistance, high mechanical strength and high impact resistance, which solves the contradiction between weldability and wear resistance that is difficult to reconcile with a single material, maximizes the material performance advantages, and is safe and reliable to use. .
2. Good wear resistance
Wear-resistant and heat-resistant alloy steel products are cast from super wear-resistant alloys. Due to the composition and structural characteristics of Rα carbide, And the matrix with solid solution content of Cr has strong heat resistance and corrosion resistance. Adding Mo makes it show good corrosion resistance and wear resistance in high temperature or corrosive environment. Adding a certain amount of rare earth makes the interior of the alloy The structure is denser and a protective film is formed on the surface to prevent carbon from seeping out. Increased wear resistance and corrosion resistance; containing a certain amount of boron makes the alloy hardness change to a hardness that cannot be achieved by adding carburization; at the same time, containing a certain amount of Mn increases the impact fatigue resistance of the alloy, making the alloy more durable. The wearability is better than that of high chromium alloys and rare earth alloys.
Has excellent toughness. Compared with ordinary steel pipes, this product has a service life of 20 to 25 times, and compared with other wear-resistant pipes, it has a service life of 3 times, reducing economic costs.
3. The composite technology is advanced and stable
The wear-resistant pipe and elbow are manufactured by the lost foam vacuum suction casting composite process, that is, the F method casting. The composite resistant pipe and elbow manufactured by this process are Grinding pipes have the following characteristics:
The process is simple, easy to operate and the production yield is high;
Due to the characteristics of this process, the dimensional accuracy of the molding is high, and the pipe is lined with a solid shape. The tube is suction-cast by high negative pressure, so the product has precise dimensions and good density.
The F-method vacuum suction casting process is used to mass-produce bimetallic wear-resistant composite pipes and elbows, with uniform structure and stable performance. There will be no cracks, pores, etc.
Good thermal shock resistance. Since the thermal expansion coefficients of the inner and outer layers of the composite wear-resistant pipe are equivalent, there will be no cracking of the inner layer or early failure in working conditions with rapid and frequent changes in height. Phenomenon.
4. Bimetallic composite elbow has high pressure resistance
All castings have certain defects, and the operating pressure does not exceed 6kg/cm2 under certain pressure conditions, but Bimetal has the advantage of high pressure resistance. Because the exterior is made of high-quality steel pipes or high-quality steel plates, which are hot-pressed and well welded, the elbow can maintain a pressure of more than 10Kg/cm2 without any problems and there will be no local air leakage. The resulting material diversion phenomenon.
5. High temperature resistance and strong corrosion resistance
A certain content of Ni, Cr, rare earth materials, etc. in the alloy not only improves the temperature resistance and corrosion resistance of wear-resistant alloy steel , and its wear resistance is enhanced, and it can operate safely and normally in the range of -40 ~ 1200℃.
6. Easy to transport, install and use
It can be installed by welding, fastener fixation, etc., and it is very convenient to cut, remove, replace, install and repair. Bimetallic composite pipes and elbows can be installed directly by welding. Due to the high resistance performance of composite pipes, when local blockage occurs in pipeline diversion, they can be knocked at will, cut at will, removed, replaced, installed, and repaired, which is very convenient.