Chrome Parts
High chrome alloy mainly include A05, A07, A49, A33, A51, A61....etc. High-chromium wear-resistant cast iron A05 (KmTBCr27, High Chrome 27% ) has high hardness and heat treatment hardness of HRC58~62. It has good abrasion resistance. As for alkaline mixed liquid, it has good corrosion resistance and can be used in strong abrasion conditions.
Product Description
High chrome alloy mainly include A05, A07, A49, A33, A51, A61....etc.
1. High-chromium wear-resistant cast iron A05 (KmTBCr27, High Chrome 27% ) has high hardness and heat treatment hardness of HRC58~62. It has good abrasion resistance. As for alkaline mixed liquid, it has good corrosion resistance and can be used in strong abrasion conditions. The casting process of high chromium cast iron is difficult and difficult to process. However, it has a long service life and moderate price, and is the most common material used for slurry pump.
This alloy provides a great balance of hardness and toughness, making it effective to pump high abrasion and corrosive liquid.
It provides modest corrosion resistance pump components such as the impellers, casings, volute liners and throatbushes.
Material Type: Erosion resistant white iron.
General Description
High Chrome 27% is a wear resistant white iron that offers excellent performance under erosive conditions. The alloy can be effectively used in a wide range of slurry types, like mine slurry, power plant, industry waste and etc
As slurry pump material, the high wear resistance of High Chrome 27% is provided by the presence of hard carbides within its microstructure. High Chrome 27% is particularly suited to applications where mild corrosion resistance, as well as erosion resistance is required.
Physical Properties
|
Density (kg/m3) |
7500 |
|
Hardness (HBW 10/3000) |
650 |
|
Tensile strength (MPa) |
780 |
|
Young¡fls modulus (GPa) |
220 |
|
Elongation at break (%) |
0.4 |
|
Toughness (J) |
190 |
Chemical Resistance
High Chrome 27% is generally not suitable for highly corrosive duties. The alloy can be used in mild corrosive duties, within a pH range of 5 to 12, for silphuric and nitric acids, or sodium hydroxide applications.
High Chrome 27% Parts Availability
Most wet-end slurry pump wear parts can be produced in High Chrome 27%. The most common parts are as follows: Slurry Pump Impellers, Throatbush, Volute liners, Frame plate liner insert, Casings.
Application Recommendations
High-Chrome 27% can be used for pumping a wide range of mild corrosive slurries. The alloy gives very excellent wear life for a wide variety of particle sizes and hardness. Usually, High-Chrome 27% is most cost effective for particles greater than 100um in size.
2. A07 (KmTBCr15Mo3) A07 is the wear-resistant king material developed on the basis of KmTBCr15Mo3. KmTBCr15Mo3 is the current wear-resistant material, which is generally used in the transportation of slurry with high concentration, high lift and strong abrasion, but its application is limited due to its high price.
(1). Heat treatment hardness: HRC58-70, with high hardness and strong wear resistance, known as the king of wear resistance.
(2). Brittle material: used for abrasive wear with medium impact load.
(3). Cr15Mo3 should be used when the median particle size of solid materials is coarse, and KmTBCr27 should be used when the median particle size is fine
3. A49 (duplex stainless white iron) This material not only has the wear resistance of high chromium alloy, but also has good corrosion resistance and strong acid resistance. It is especially suitable for the pump of flue gas desulfurization system. It is the metal material of flue gas desulfurization pump, with very good service effect and long service life.
(1). Heat treatment hardness: HRC44-50.
(2). Corrosion resistance: Austenite gives it corrosion resistance, which is resistant to sulfuric acid solution with PH of 4, sodium hydroxide solution with PH of 13, and CL with certain concentration.
(3). Abrasion resistance: Carbide gives alloy wear resistance, mainly resisting the abrasion of gypsum solid particles.
4. A33 (duplex stainless white iron)
(1) Heat treatment hardness HRC35-50II
(2) Corrosion resistance: Austenite gives it corrosion resistance and can withstand sulfuric acid solution with PH of 1.
(3) Abrasion resistance: carbide gives the alloy wear resistance, mainly resisting phosphogypsum, nitric acid, sulfuric acid and other media.
5. A61, contains 50% chromium carbide and achieves outstanding erosion resistance. This makes it ideal for conditions with a broad particle size distribution such as mill discharge slurries.
6. A68 alloy benefits from new metallurgical advances that combine the robust wear resistance of A61 with the anti-corrosive properties of A05 alloy. This makes it ideal for moderately corrosive environments that require a harder material than A05 alloy.
Main Material Code for High Chrome Wear Parts
|
Material Code |
Material # |
Hardness HRC |
Performence |
Applications |
|
A01 |
KmTBCr8 |
>55 |
Abrasion-resistant performance is about 10% less than A05. |
Mud & slag applications |
|
A03 |
KmTBNi4Cr2 |
>56 |
Abrasion-resistant performance is about 20% less than A05. |
Neutral water-sand slurry and applications with lower impact load. |
|
A05 |
KmTBCr26 |
>56 |
Ranks second only to A07 in abrasion-resistant performance; fair corrosion |
High impact load abrasion condition;PH rate ranging from 5 to 12. |
|
A07 |
KmTBCrl5Mo3 |
>59 |
resistant performance. Best abrasion-resistant performance; corrosion-resistant performance is inferior to A05. |
High impact load abrasion condition. |
|
All |
KmTBCrMnMo |
38-42 |
Mild corrosion-resistant; lower hardness; drilling andtapping operations are applicable. |
Fine particles with light abrasion. |
|
A33 |
|
>35 |
Abrasion-resistant performance is close to A03;fair corrosion-resistant performance. |
Oxide slurry with PH rate no less than 1, like phospho-gypsum in phosphate fertilizer plant, nitric acid, sulph-oacid and phosphoric acid, etc. |
|
A49 |
|
>43 |
Fair abrasion-resistant performance, close to A03; fair corrosion-resistant performance in media with lower PH rate. |
Corrosion conditions with low PH rate, especially for flue gas and FGD devices for media of Ph24; general suitable for lower acid condition. |
|
A12 |
|
>62 |
Higher abrasion-resistant performance than A05;fair corrosion-resistant performance; suitable for media with PH rate is 6 - 14, where A05 is not suitable. |
High abrasive slurry with fine particles. |
|
A61 |
|
63 〜68 |
Optimized abrasion-resistant performance than A12. |
High abrasive slurry with fine particles. |
|
A25 |
|
280-320HB |
Hardness is lower than the anti-wear ductile iron, tolerance of mild shock and mild abrasive wear. |
Suitable for conveying small gravel, generally not used for impeller and guard plate.suitable for the corrosive environment. |
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