Duoleng abrasive media:bearing steel grit & Cr alloy steel shot features

1. Cr Alloy Steel Shot & Bearing Steel Grit

2. Overview
1. Company Information
2. Cr Alloy Steel Shot
3. Bearing Angular Steel Grit
4. Quality Control
5. Applications
6. Customer Reference
7. Contact Information

3. 1,Company Information
1. Founded in 1988
2. Location: Jiaomei Town, Fujian Province, China - 25 kms from Xiamen Airport.
3. We also opened an international sales office in Xiamen at the early of 2011.
4. We started a new factory in Dalian,which is called: Haixi(Dalian) New Material Co.,Ltd

4. Certification
ISO9001 Qualification

5. R&D and Patents
Technical Innovation Enterprise Knowledge & Technology-Intensive Enterprise
Intellectual Property-11 National Patents

6. Advanced Production
Centrifugation Method Unique Size Screening Eco-friendly Manufacturing
Steel Shot
& Steel Grit
Production
• Unique equipments in the world
• Eco-friendly manufacturing
• Automatic production systems
•Complete Laboratories
Automatic Packing Complete Laboratories

7. 2, Cr Steel Shot
This Cr steel shot is made from Cr alloy materials which are fast atomized
after melting.
• Cr steel shot gives a longer life and is more durable than traditional high
carbon steel shot because it is relatively crack free. With high carbon steel
material, the shotting operation produces surface cracks which are
extended in subsequent heat treatment. However,this does not occur in Cr
shot because of its different structure.
• It has been proved that our Cr steel shot is suitable for descalling, cleaning
and peening of oxygenated surface . so as to greatly improve the blasting
efficiency and coating quality, and to reduce kinetic energy of paint,
abrasive consumption and so on, as well as to prolong the life of wearing
parts.
• As Cr steel shot has a finer structure and does not have cracks. The
consumption has been reduced by more than 10-15 % in trials by our
customers factories compared with traditional high carbon steel shot.

8. 2, Melting 3,Centrifugation Method for Steel Shot
7, Test the Ervin life & Hardness
8,Pack the qualified cargo
6, Heat Treating
4, Drying
5,Screening for different sizes
1, Strick controlling for
the raw materials, adopt
the chrome alloyed
materials.
Production Process for Cr Steel Shot

9. Features of Cr Alloy Steel Shot
Features:
Homogeneous Size
Low Hollow Ratio
 Good Roundness
 Homogeneous Hardness
 High Density
Nice Microstructure
Less Consumption
Well Resistance
Chromium Included

10. Chemical Composition
The chemical composition for our alloy steel shot confirms to the following
elements:
Chromium(Cr) is used in constructional alloy steels primarily to increase hardenability, provide
improved abrasion-resistance and to promote carburization.
Characteristics: Hardenability, wear resistance and corrosion resistance.

11. SAE Size Standard
Alloy Steel Shot (SAE Standard)

12. Cr Alloy Steel Shot- Physical Properties
Item Cr Steel Shot
Shape Spherical
Standard Special（reinforced）
40-50HRC（377-509HV） >52HRC（>540HV）
Fine and Homogeneous
Tempered Troostite
C Level<2
Fine and homogeneous
Tempered Martensite
Hardness
Microstructure
Density ( g/cm3) ≥7.2
Standard Type：Applied for surface cleaning of casting parts, removing
corrosion surface of metal and stainless steel products cleaning
Special type: Applied for dispelling the stress of metal materials, especially for
aeronautic material and spring material

13. Microstructure Comparison for Steel Shot
The Cr steel shot is produced by melting Cr alloy Steel scrap with Centrifugation Method . The
microstructure after the Centrifugating process is a finer structure ,which is tough and durable.
However,the high carbon shot is produced by using all kinds of scrap. Therefore the shot particles
after atomizing into water are very hard with surface cracks. The shot has to be heat treated by
quenching and tempering to remove the very coarse martensitic structure. During this process the
surface cracks can be extended.
Cr Steel Shot High Carbon Steel Shot

14. Advantages of using Cr steel Shot:
1, >10% Less consumption than High Carbon Steel Shot
2,Suitable for oxygenated surface descaling, surface cleaning and surface
peening, so as to greatly improve the blasting efficiency and coating
quality, and to reduce kinetic energy of paint
3, Less dusty by using our Cr Steel Shot. It has been proofed that the
surface cleaning level can reach SSPC-SP5 after blasting with our Cr Shot
.

15. 3,Bearing Angular Steel Grit
This new steel grit is made from bearing off-cut steel which maintains
FORGING STATE, but not CASTING STATE.
• With the professional process of quenching, crushing, sieving and special
heat treatments, such a grit shows angular shape with features of abrasive
resistance and impact ductility.
• During the usage ,it is proved that the angular shape of the grit will
gradually becomes arc, which is suitable for oxygenated surface descaling,
surface cleaning and surface peening, so as to greatly improve the blasting
efficiency and coating quality, and to reduce kinetic energy of paint,
abrasive consumption and so on, as well as to prolong the life of wearing
parts.

16. Production Process for Bearing Steel Grit
7, Test the ervin life
1,Analyse the chemical
component & size for raw
bearing steel materials
8,Pack the qualified cargo
2, Heat treating
①.Controlling the heat treating
tempreture
② Controlling the heat treating time
3,Crushing 4,Screening for different size
6, Test the hardness 5,Heat treating

17. Features of Bearing Angular Steel Grit
Features:
 Fully Angular
 High density
 Nice Microstructure
 Chromium Included
 High wearing resistance
 Less consumption
Homogeneous Hardness
Well Resistance

18. Chemical Composition
Bearings are made of high carbon steels. One of the factors that determine
the life of bearing steel is the purity or cleanliness of steel. The impurities
are removed through process such a vacuum degassing and consumable
–electrode vacuum melting while manufacturing bearing steel.
The chemical composition for our bearing steel grit confirms to the following elements:

19. Chromium(Cr) is used in constructional alloy steels primarily to increase hardenability, provide
improved abrasion-resistance and to promote carburization. Of the common alloying elements
chromium is surpassed only by carbon, manganese and molybdenum in its effect on
hardenability. Chromium forms the most stable carbide of any of the more common alloying
elements, giving high-carbon chromium steels exceptional wear-resistance. Because its carbide
is relatively stable at elevated temperatures, chromium is frequently added to steel used for
high temperature applications.
Characteristics: hardenability, wear resistance and corrosion resistance.

20. 2,Bearing Angular Steel Grit (SAE Standard)

21. Bearing Steel Grit- Physical Properties
GH: Hardness>60 HRC
Applied for granite gangsaw cutting, surface treatment for cold roll
and pre-treatment of metal parts.
GL: Hardness 53~60 HRC
Applied for removing corrosion surface, descaling, increasing roughness to
get better surface preparation for coating.
GP: Hardness 40~50 HRC
Applied for cleaning metal surface, such as casting parts.

22. Advantages of Bearing Steel Grit
Items Bearing Angular Steel Grit Normal Steel Grit
Material Bearing steel cut-off
Different kinds of steel
scrap
State Forged Casted
Appearance Fully Angular Arc grit
Processing
No melting, energy-saving
and environment friendly
High energy consumption
& pollution
Density ≧7.4 g/cm3 ≧7.3 g/cm3

23. Microstructure Comparison for Steel Grit
Bearing Angular Steel Grit
Tempered Martensit and fine carbide
Arc-Steel Grit from shot Tempered
Martensite and coarse & netty carbide

24. 4, Quality Control
Chemical Composition
1.Crush shot /grit samples 2 Weighing 3,Melt the samples 4,Analysis of Composition 5, Result Analysis
Hardness
1.Crush shot /grit samples 2,put them together 3,Grinding for smooth surface 4, Mirco-glass analysis 5, Result Analysis
Size
1,Prepare for 1kg samples 2,Screen on 5 sievers 3,Weight the sampls left on each screen 4,Caculate the percentage
Ervin Life
1.Prepare for 500g samples 2,Put into Ervin life time test machine for test 3,Caculate the life time

25. 5,Application Industry

26. 6, Customer reference
1,Nowadays we are exporting large quantity of our steel shot & steel grit into over 50
countries including America, Canada, Japan, Australia, Germany, ...
2,Our bearing angular steel grit has taken up over 90% of domestic granite market.
3,Our steel shot & steel grit are widely used in China CNPC Pipeline coating & 26 Chinese
Shipyard companies, eg:
.COSCO Shipyard Group Co.,Ltd
.STX(DALIAN) Shipyard Building Co.,Ltd
.SAMSUNG Heavy Industries(Ninbo) Co.,Ltd
.Fujian Crown Ocean Shipbuilding Industry Co., Ltd
.Fujian Southeast Shipyard
.Xiamen Shipbuilding Industry Co., Ltd
.Chenxi Shipyard Co.,Ltd
.Guangzhou Wenchong Shipyard Co. Ld
...
We also hope that we could join together to create bright future!

27. 7,Contact Information
Cell: 0086 150 6074 8117
Tel: 0086-592-8268538 ext 617
Fax: 0086-592-8268556
Website: www.duoleng.com
E-mail: belen@duoleng.com
Skype:duoleng_belen
Mr. Belen ZHANG