Low Carbon and High Boron Cast Superalloy K491 / B1914 /

• Application: Industrial
• Standard: GB, ASTM
• Purity: >99.5%
• Alloy: Alloy
• Powder: Not Powder
• Transport Package: Wooden
• Model NO.: XD-34
• Origin: Jiangsu Baoying
• HS Code: 7505120000
• Production Capacity: 500ton/Year

Product Description

K491 alloy is a low-carbon and high-boron casting superalloy developed on the basis of American B1914 alloy and using special low-segregation technology. It has good microstructure stability and good casting process performance. It is suitable for making turbochargers below 850 °C Blades and other high temperature parts.

Chemical composition:
     C          Cr             Ni            Co            Mo               Al              Ti            Fe           B            Zr        Mn       Si         S          P          Pb            Bi           Ag         Mg
 ≤0.02  9.5~10.5   Balance   9.5~10.5  2.75~3.25   5.25~5.75   5.0~5.5     ≤0.5   0.08~0.12   ≤0.04   ≤0.10   ≤0.10   ≤0.01  ≤0.01  ≤0.0005   ≤0.0005  ≤0.0005   ≤0.005

K491 Heat Treatment System

Slowly heat to 1080°C, hold for 4h, cool in air +900°C, hold for 10h, and cool in air.

K491 Variety Specifications and Supply Status

Round bar ingots with a diameter of 70-90mm are supplied as-cast.

K491 Melting and Casting Process

The master alloy is smelted in an air induction furnace, and the investment casting parts and samples are remelted and poured in a vacuum induction furnace.

K491 application overview and special requirements

The alloy is used as turbocharger blades, hundreds of thousands of pieces have been produced, and thousands of superchargers are installed.

K491 process performance and requirements

(1) Formability

The casting performance is good, the loose tendency is small, and the casting shrinkage rate is 2%. The precision casting method can cast parts with complex shapes, such as turbine blades and integral castings.

(2) Heat treatment process of parts

The parts are used after heat treatment, and the treatment specification is the same as that of the alloy heat treatment.

K491 (K91) C74910 cast superalloy

chemical composition(%) :

Carbon C (%): 0.020

Chromium Cr(%): 9.510.5

Molybdenum Mo(%): 2.753.25

Nickel Ni(%): Allowance

Cobalt Co(%): 9.5010.50

Aluminum AI (%): 5.255.75

Titanium Ti(%): 5.005.50

Iron Fe(%): 0.50

Silicon Si(%): 0.10

Manganese Mn(%): 0.10

Phosphorus P(%): 0.010

Sulfur S(%): 0.010

Boron B (%): 0.080.12

Zirconium Zr (%): 0.040

Magnesium Mg(%): 0.005

The superalloy material for the direct preparation of parts by the casting method. According to the alloy matrix composition, it can be divided into three types: iron-based casting superalloy, nickel-based casting superalloy and cobalt-based casting superalloy

Cast superalloys have the following characteristics:

(1) The degree of alloying is high. The γ' strengthening phase (see the intermetallic compound phase of the superalloy material) forms the elements aluminum, titanium, niobium, tantalum, etc. up to 16%, and also adds a certain amount of solid solution strengthening elements tungsten and molybdenum.

(2) The chromium content is relatively low, most of which are below 10%.

(3) The grain boundary strengthening element boron content is all O. 01% or more.

(4) Most of the carbon content exceeds o. 1%, and the carbon content of cobalt-based cast superalloys is as high as 1%. (5) Some cast superalloys add 1% to 2% hafnium to improve medium temperature plasticity and increase creep strength.
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