COMBALLS CORP.Graphtech Materials Co.,Ltd

Specialist manufacturer for all kind of precision and grinding steel & ceramic balls .....Full rang of type and size to fit various industry......Sincerity / Smile / Smart / Speed / Study ......A excellent Comballs brand with its strict quality ,on time delivery, competativeprice ,best service and high customer satisfaction rate ......

Feature: Universal material for ball and roller bearing industry.Chrome steel balls contain chromium and due to through hardeninghas an excellent surface quality and high load bearing.Hardness: Modern heat treating facilities, complete with controlledatmosphere and temperature, to maintain excellent hardnesscontrol with a through hardness of HRC 60 to 67.Size Available: 0.5mm - 102mm (4")Grade Available: G5, G10 - G1000Application: Universal for many application. For example: balls &roller bearings, Linear montion, Balls lead screws, grinding media.

STEEL BALLS

Chrome stee balls

Carbon steel balls

Feature: High hardness with a soft core givingresistance to shock load & excellent resistanceto surface wear.Hardness: Hardness is HRC 60 min. Referencethe accompanying chart for minimum casedepth.Size Available: 2.0mm - 50mm (2")Grade Available: G40 -- G1000Application: Moderate loads and alow rotatingparts, for example: castors, conveyors, rollerskates, drawer slides, seat slides, bicycles,etc.

AISI52100

AISI1015

AISI 1086 Feature: Advantage of being through hardened. cheaper than high carbonchrome alloy steelHardness: HRc58-64 Size Available: 2.0mm - 25.4mm (1")Grade Available: G48 - G1000

440C Stainless Steel:A martenistictype stainless steelused extensively in bearingapplications thathardness,dimensional stability, corrosionresistance and toughness.balls are resistant to corrosionfresh water, steam, crude oil,gasoline,perspiration, alcohol, bloodand stuffs. 440 is also magnetic. Size Available: 0.5mm - 102mm (4")Grade Available: G10 - G1000

316 Stainless Steel:316 stainless steel balls provide resistancetosulfurous acid compounds and otherhighly corrosive environments, andis used in the presence of sulfuric,phosphoric and acetic acids. It is theleast magnetic of the 300 series. Size Available: 0.5mm - 102mm (4")Grade Available: G100 - G1000

304 Stainless Steel: 304 StainlessSteel is an austentistic, unhardenedstainless steel with excellentresistance to corrosion by oxidizingagents,most organic chemicals, foodand sterilizing solutions. It has acarbon content than 302 StainlessSteel and is slightly magnetic.Size Available: 0.5mm - 102mm (4")Grade Available: G100 - G1000

302 Stainless Steel:302 Stainless Steel is extremely tough and corrosion resistant to oxidizingsolutions andmany organic compounds in an unhardened state. In its annealed condition itwithstands attacks by food stuffs, dyes, sterilizing solutions and nitric acid. It isnot recommended for sulfuric or halogen applications, and is slightly magnetic.Size Available: 0.5mm - 102mm (4")Grade Available: G100 - G1000

Manufacturing Process ofSteel Balls• Material• Heading• Flashing• Heat treatment• Grinding• Lapping• Washing• Final Inspection

Qingdao ,266061, China

Tel:+86(0)532 8823 5086Fax:+86(0)532 83883615http://www.comballs.comemail:sales@comballs.com

Soft steel shota non-toxic - substituteball of hunting shots

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.220 .210 .200 .190 .180 .170 .160 .150 .140 .130 .120 .110 .100 .090 .080

Carbon 0.98 to 1.10%Chromium 1.30 to 1.60%Manganese 0.25 to 0.45%Silicon 0.15 to 0.35%Sulfur 0.025% maximumPhosphorous 0.025% maximum

Tensile strength 325,000 psiYield strength 295,000 psiElongation in Two Inches 5%Reduction in Area 8%Modulus of Elasticity 29,500,000 psiDensity 0.283 lbs/cubic inch

Carbon 0.10 to 0.20%Manganese 0.60 to 0.90%Silicon 0.10 to 0.20%Sulfur 0.50% maximumPhosphorus 0.040% maximum

Tensile strength 53,000 psiYield strength 44,000 psiElongation in two inches 26%Reduction in area 50%Modulus of elasticity 28 x 10^6 psiDensity 0.284 lbs/cubic inch

420 Stainless Steel Balls420 Stainless Steel balls offer goodhardness and surface finish. It isgenerally used for all applicationsrequiring resistance to corrosionfrom water, steam, air andgasoline. 420 is not recommendedfor applications requiringresistance to most chemicalsolutions. 420 is also magnetic.

Tolerances by Grade for Individual Balls

Grade VDws ΔRw Ra3 0.08 0.08 0.0125 0.13 0.13 0.00210 0.25 0.25 0.02516 0.4 0.4 0.02524 0.6 0.6 0.0548 1.2 1.2 0.08100 2.5 2.5 0.125200 5 5 0.2500 13 13 *1000 25 25 *

PROPERTIES 302 304 440C 316 Stainless steel stainless Steel Stainless Steel Stainless SteelTensile Strength 180,000 psi 150,000 psi 275,000 psi 45,000 psiElongation in Two Inches 60% 60% 2% 35%Reduction in Area 63% 65% 10% 60%Modulus of Elasticity 29 x 10^6 psi 29,500,000 psi 29,000,000 psi 28,000,000 psiRockwell Hardness Rc 25-29 Rc25-29 Rc58-65 Rc25-39

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