Iron-Nickel-Chromium-Based Cast Superalloy / High Temperature Heat Resistant Steel K213 / K13 /

• Application: Industrial
• Standard: GB, ASTM
• Purity: >99.5%
• Alloy: Alloy
• Powder: Not Powder
• Transport Package: Wooden
• Model NO.: XD-32
• Origin: Jiangsu Baoying
• HS Code: 7505120000
• Production Capacity: 500ton/Year

Product Description

Introduction of K213 alloy

K213 alloy is a cast superalloy which takes iron-nickel-chromium austenite as matrix and adds more tungsten, titanium, molybdenum and boron elements to further strengthen and improve process performance. K213 alloy not only has excellent casting process performance, but also has a relatively high level of mechanical properties, and has good coordination at temperatures below 750 ° C. It is an ideal material for making supercharged turbines in my country and saving nickel raw materials. In recent years, it has begun to be used to manufacture gas turbine and flue gas turbine blades. As a supercharger turbine and gas and flue gas turbine blade material that operates at high temperature for a long time, its long-term tissue stability at operating temperature and its impact on performance are very important.

Chemical composition:
        C            Cr              Ni              W             Al            Ti             Fe               B              Mn      Si          P           S         
     <1.0   14.0~16.0   34.0~38.0   4.0~7.0    1.5~2.0   3.0~4.0    Balance    0.05~0.10      ≤0.5    ≤0.5   ≤0.015   ≤0.015  

K213 alloy use
Application overview and special requirements It is used for radial turbocharger, axial turbocharger turbine blades, gas turbine and flue gas turbine motors and stator blades for long-term use below 750 °C. From 1965 to 1998, it produced nearly 100,000 sets of various oil tanks and radial turbochargers for automobile diesel engines, and more than 200,000 sets of axial turbochargers for diesel locomotives. Tens of thousands of rotor blades and stationary blades for various types of flue gas wheels made of this alloy are also produced.

K213 Process performance and requirements
(1) Formability The casting performance is good, and the investment casting method can be used to cast thin-walled castings and integral turbines with complex shapes. The casting shrinkage of the alloy has an average linear shrinkage of 1.44% and an average bulk consolidation rate of 3.81%.

(2) Welding performance The alloy can be friction welded with 40Cr18CrNiWA and other materials. Surface defects of precision castings for static use are permitted to be repaired with GH130 alloy wire.

(3) Parts heat treatment process 1100C, 4h, air cooling.

K213 alloy electroplating characteristics
(1) K213 alloy contains 34%-36% nickel, 14%-18% chromium, and high chromium-nickel content, so it is easy to passivate, and the bonding force with the coating is poor if it is not handled properly. The hydrogen overpotential on nickel is relatively low. During the electroplating process, hydrogen is easily precipitated on the cathode, resulting in hydrogen permeation to the workpiece.

(2) K213 alloy is a precision casting alloy, and it is difficult to avoid the existence of pores. When there is hydrogen permeation and hydrogen evolution in the process, it will lead to coating defects.

(3) Nickel electroplating of K213 alloy is used as the first process to obtain the nickel-chromium or nickel-chromium-aluminum protective layer of K213 alloy. Because chromizing or chromium-aluminum co-infiltration is carried out under the condition of 1100 ºC, if If hydrogen gas is stored or evolved in the pores between the substrate and the coating or on the surface of the substrate, it will swell to form a high pressure during the heating process, which will inevitably cause the coating to bulge or even completely destroy it, so how to prevent it? The pretreatment of the alloy before electroplating and the hydrogen permeation during the nickel electroplating process are one of the keys to ensure a good permeation layer.

Physical properties:

Density: 8.14g/cm3 Melting Point: 1324-1361ºC

Elastic modulus: 125-178GPa Thermal conductivity: 10.89 W/(m•ºC)

Hardness (HBS): 325 Thermal expansion coefficient (20-100ºC): 12.36×10-6/ºC

2. Main features: K213 alloy has good casting process performance, and has good comprehensive performance and microstructure stability below 750°C.

3. Application example: used for long-term use of radial turbocharged turbines, axial turbocharged turbine blades, gas turbines and flue gas turbine motorized, static blades.

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