Bearing Steel Grit &Cr Alloy Steel Shot

Overview

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

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

Certification

ISO9001 Qualification

Technical Innovation Enterprise Knowledge & Technology-Intensive Enterprise

Intellectual Property-11 National Patents

R&D and Patents

Advanced Production

• Unique equipments in the world • Eco-friendly manufacturing • Automatic production systems •Complete Laboratories

Steel Shot & Steel Grit Production

Centrifugation Method Unique Size Screening Eco-friendly Manufacturing

Automatic Packing Complete Laboratories

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.

2. Bearing Angular Steel Grit

Production Process for Bearing Steel Grit

7, Test the ervin life

8,Pack the qualified cargo

1,Analyse the chemical component & size for raw bearing steel materials

2, Heat treating

①.Controlling the heat treating tempreture

② Controlling the heat treating time

3,Crushing 4,Screening for different size

5,Heat treating 6, Test the hardness

Features of Bearing Angular Steel Grit

Features: Fully Angular High density Nice Microstructure Chromium Included High wearing resistance 30% Less consumption Homogeneous Hardness Well Resistance

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.

Chemical Composition

The chemical composition for our bearing steel grit confirms to the following elements:

Chemical

Composition

C 0.70-1.20%

Si 0.15-1.20%

Mn 0.20-1.20%

Cr 0.60-1.20%

S ≤0.05%

P ≤0.05%

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.

2. Bearing Angular Steel Grit (SAE Standard)

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.

Bearing Steel Grit- Physical Properties Items Bearing Angular Steel Grit

Shape Fully Angular

Hardness

GH GL GP

>60HRC(>710HV) 53-60HRC(510-

710HV)

40-50HRC(377-

540HV)

Microstructure

Fine &

Homogeneous

Tempered

Martensite

Fine &

Homogeneous

Tempered

Martensite

Fine &

Homogeneous

Tempered Troosite

C Level<2

Density(g/cm3) ≥7.40

Advantages of Bearing Steel Grit

Item Bearing Angular Steel Grit Normal Steel Grit

Material Bearing Steel Cut Off Steel Scrap

State Forged Melt-Casted

Appearance Fully Angular Arc

Technique Directly Crushed,no melting, twice

quenching

Crushed by melt-casted

steel shot, once

quenching

Density ≥7.4g/cm3 ≥7.2g/cm3

Bearing Angular Steel Grit Tempered Martensit and fine carbide

Arc-Steel Grit from shot Tempered Martensite and coarse & netty carbide

Microstructure Comparison for Steel Grit

3. 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.

7, Test the Ervin life & Hardness

8,Pack the qualified cargo

6, Heat Treating

2, Melting 3,Centrifugation Method for Steel Shot 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

Features: Homogeneous Size Low Hollow Ratio Good Roundness Homogeneous Hardness High Density Nice Microstructure Less Consumption Well Resistance Chromium Included

Features of Cr Alloy Steel Shot

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.

Chemical

Composition

C 0.70-1.20%

Si 0.40-1.20%

Mn 0.35-1.20%

Cr 0.35-1.00%

S ≤0.05%

P ≤0.05%

SAE Size Standard Alloy Steel Shot (SAE Standard)

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

Cr Alloy Steel Shot- Physical Properties

Item Cr Steel Shot

Shape Spherical

Hardness Standard Special（reinforced）

40-50HRC（377-509HV） >52HRC（>540HV）

Microstructure

Fine and homogeneous Tempered Martensite

Fine and Homogeneous Tempered Troostite

C Level<2

Density ( g/cm3) ≥7.2

Microstructure Comparison for Steel Shot

Cr Steel Shot High Carbon 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.

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

.

4. Quality Control

Chemical Composition

1.Crush shot /grit samples 2 Weighing 3,Melt the samples 4,Analysis of Composition 5, Result Analysis

1.Crush shot /grit samples 2,put them together 3,Grinding for smooth surface 4, Mirco-glass analysis 5, Result Analysis

Hardness

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

5. Application Industry

6. Customer reference

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!

1,Nowadays we are exporting large quantity of our steel shot & steel grit into over 50 countries including Germany, Japan, America, Canada, Australia,, ...

2,Our bearing angular steel grit has taken up over 90% of domestic granite market.

Mob: 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

7,Contact Information