Heavy Duty Forged Steel Balls for Large-Scale Autogenous (AG) Grinding Mills

Product Description

Factory Direct Sales CE Certificate Forging Ball Grinding Steel Ball D20 to D150 B2 B3 Grinding Media Steel Ball for Mining Industries
Update:May 22th, 2026

Product Description

Size: Dia20- 150mm
Material: C45, 60Mn, 65Mn, 40Cr 42 Crmo,B2,B3, B6
Hardness: C45:48-55HRC, 60Mn:57-61HRC,
                  B2:60-64HRC, B3:62-65HRC, B6:62-65HRC

The manufacturing process of steel balls
JUNDA company produces φ20 to φ 150 forged steel balls ,select high quality round steel,low-carbon alloy ,high manganese steel,high carbon and high manganese alloy steel as raw material produced by air hammer forging process.
We select high-quality round steel as raw materials, and adopts advanced equipment, unique heat treatment process and strict quality control system to make our forged steel balls have a better performance in the overall hardness, surface hardness up to 58-65HRC, volume hardness up to 56-64HRC.
The hardness distribution is uniform, the impact toughness value is 12J/cm2,and the crushing rate is far less than 1%. Forged steel ball chemical composition: carbon content in 0.4-0.85, manganese content in 0.5-1.2, chromium content in 0.05-1 2.
We can product different size according to customer's request.

 

Product features

Product Parameters

TECHNICAL PARAMETERS OF FORGING STEEL BALL

Technical parameters of forging steel ball

Inch

Size

T weight

Tolerance(mm)

Material

Surface hardness(HRC)

Volume hardness(HRC)

3/4"

D20mm

0.037+/-0.005

2+/-1

B2

63-66

63-66

1"

D25mm

0.072+/-0.01

2+/-1

B2

63-66

63-66

11/4"

D30mm

0.13+/-0.02

2+/-1

B2

63-66

63-66

11/2"

D40mm

0.30+/-0.04

2+/-1

B2

62-66

62-66

2"

D50mm

0.6+/-0.05

2+/-1

B2

62-65

61-64

21/2"

D60mm

1.0+/-0.05

2+/-1.5

B2

62-65

60-62

21/2"

D65mm

1.3+/-0.05

2+/-1.5

B2

61-64

60-62

21/2"

D65mm

1.3+/-0.05

2+/-1.5

B3

61-63

60-62

3"

D75mm

2.0+/-0.06

3+/-2

B3

61-63

60-62

3"(Hot rolled)

D80mm

2.0+/-0.06

3+/-2

B3

60-63

60-62

3"(Forged)

D80mm

2.1+/-0.06

3+/-2

B3

60-62

53-57

31/2"

D90mm

3.0+/-0.07

3+/-2

B3

60-63

59-62

4"

D100mm

4.1+/-0.15

3+/-2

B3

60-63

59-62

4.5"

D115mm

6.3+/-0.15

3+/-2

B3

60-63

57-60

5"

D125mm

8.1+/-0.3

3+/-2

B3

59-62

55-60

Chemical composition

C%

Si%

Mn%

Cr%

P%

S%

Ni%

B2

0.72-1.03

0.15-0.35

0.3-1.2

0.2-0.6

≤0.035

≤0.035

i≤0.25

B3

0.53-0.88

1.2-2.00

0.50-1.20

0.7-1.20

≤0.035

≤0.035

i≤0.25

Warm prompt:
 If you need to customize, or other parameters of the product,You can contact us at any time by clicking the link below: https://chinagarnetsand.en.made-in-china.com/contact-info.html
D65mm forging steel ball  D75mm forging steel ball  D80mm forging steel ball D90mm forging steel ball  D100mm forging ste


 

Quality inspection

Company Profile

What does Jinan Junda Industrial Technology Co., Ltd. do?
Jinan Junda Industrial Technology Co., Ltd. is a manufacturer and supplier specializing in sandblasting abrasives and equipment, as well as surface treatment solutions. Established in 2005, the company produces a range of products including Steel Shot, Steel Grit, Garnet Sand,Glass Beads,Copper Slag,Brown Fused Alumina, White Fused Alumina,Black Silicon carbide powder,Forged Steel Ball,Cast Steel Ball,Chrome Steel Ball,Carbon Steel Ball,Stainless Steel Ball,Paint Sprayer Machine,Air Compressor,Air Storage Tank,Sandblasting machines, and related spare parts. It also offers customized engineering support, OEM/ODM services, and holds international certifications such as ISO 9001 and CE. Serving clients worldwide across industries like surface preparation and corrosion control, Jinan Junda is recognized for its quality products, professional service, and competitive pricing.

In addition, we have obtained lS0 901 certification, CE certification, and KOC certification. Selling well in all cities and provinces around China,our products are also exported to clients in more than 100 countries and regions as the USA,Canada, Chile, Peru, Argentina, Australia, Germany, UK, Denmark, Norway,Russia,Saudi Arabia,Japan, Malaysia and South Africa. We also welcome OEM and ODM orders. Whether selecting acurrent product from our catalog or seeking engineering assistance for your application, you cantalk to our customer service center about your sourcing requirements.

What is the quality of service and support provided by Jinan Junda Industrial Technology Co., Ltd.?
We are located in Jinan with convenient transportation access.Dedicated to strict quality control and thoughtful customer service, our experienced staff members are always available to discuss your requirements to ensure full customer satisfaction in many different Sand Blasting,Surface Preparation, and Corrosion Control industries.

Adhering to the business principle of mutual benefits, we have a reliable reputation among ourcustomers because of our professional services, quality products and competitive prices. We warmly welcome customers from at home and abroad to cooperate with us for common success.

Customers visit

Certifications

Which certifications has our company obtained?
Our operations and products are backed by key international certifications, including ISO 9001 for quality management, CE for the European market, and KOC for South Korea. These credentials are not just badges of compliance but essential enablers of our global reach, supporting our exports to a network of over 100 countries and reinforcing our clients' trust in our professional standards.

FAQ

Q1: What is the advantage of your company?
A: At Shandong Junda experience meets expertise. With 20+ years devoted to the artof crafting premium steel balls, we stand at the forefront of the industry, deliveringunmatched quality and innovation.
Q2. In which countries are your products sold?
A: Our global footprint spans continents! From the Americas to Africa and beyond,our products reach Mexico, Canada, Brazil, and nations across Africa like Tanzaniaand Ghana, extending to the dynamic markets of Asia and Australia.
Q3: Are you trading company or manufacturer?
A: Proudly, we are a factory, where superior craftsmanship meets industrial prowess,giving birth to productsthat set benchmarks.
Q4: How long is your delivery time?
A: Typically, our efficient processes ensure a delivery window of 10-15 days, thoughthis can vary with order volumes to better suit your needs.
Q5: Do you provide samples? Is it free or extra?
A: Absolutely! We are pleased to offer samples at no charge, although we requestthat you handle the freight cost.
Q6: What is your terms of payment?
A:We offer convenient T/T payment options: 30% upfront and 70% upon the copy of B/L.Alternatively, we accept L/C: a 100% Irrevocable letter of credit at sight, combiningflexibility with security in transactions.
Q7: What materials are your company's wear-resistant steel balls made of, andwhich international standards do they comply with?
A: Junda Heavy Industry mainly deals in high-chromium cast balls(Cr15/Cr20/Cr26), low-chromium cast balls, and forged/rolled steel balls. The rawmaterials are sourced from well-known domestic steel mills, with strict control overthe composition of C, Cr, Mn, Si, S/P s 0.1%. The products comply with internationalstandards such as ISO, ASTM, and GB/T 17445, and third-party material certificatescan be provided.
Q8: What is the hardness index of Junda Steel Balls and how is the uniformity ofhardness guaranteed?
A:Our company's high-chromium balls have a hardness of HRC58-65, and theforged balls have a hardness of HRC55-62. We adopt a dedicated heat treatmentprocess, ensuring that the hardness difference within the same batch is s 2HRC andthe hardness difference between the surface and core is s 3HRC, guaranteeingconsistent wear resistance and no uneven wear throughout the process.
Q9: Can the size specifications and tolerances of the steel balls meet the overseasrequirements?
A: Junda can produce full specifications of wear-resistant steel balls ranging fromo20mm to o150mm. The dimensional tolerance is controlled within +0.3mm to+1mm, and the sphericity/ellipticity is s0.2mm. The fully automatic production lineensures precise dimensions, making them suitable for various imported grindingmills.
Q10: How are export packaging and ocean freight logistics arranged?
A: Standardized packaging is adopted, including ton bags, iron drums, andmoisture-proof woven bags. The material, specification, net weight, and furnacebatch number are clearly marked. Anti-rust and moisture-proof treatment is carriedout throughout the process. We support full container load (FCL) or less thancontainer load (LCL) shipment and comply with global marine logistics standards.
Q11: What qualification documents are required for overseas procurement? Canyour company provide them?
A:Junda has passed the ISO9001 quality system certification and canprovide a full set of export documents such as CE and SGS test reports, factorycertificates of conformity, batch traceability reports, and customs declaration materials. We support third-party re-inspection by customers.

 

If any need, please contact us any time!!!
We are well aware that a satisfactory shopping experience is not only dependent on excellent product quality, but also requires thoughtful and reliable after-sales service.
From the moment you chose us, we have embarked on a long-term commitment and protection.No matter what problems you encounter, our after-sales team will provide you with efficient and prompt solutions with a warm and patient attitude. Your satisfaction is our eternal pursuit.

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