20-150mm Forged Steel Grinding Ball Grinding Media Grinding Ball Grinding Media Steel Ball for Copper Gold and Iron Ore Mining Ball Mills

Product Description

20-150mm Forged Steel Grinding Ball Grinding Media Grinding Ball Grinding Media Steel Ball for Copper Gold and Iron Ore Mining Ball Mills
Update:July 15th, 2026

Product Description

JUNDA Forged Steel Grinding Balls are high-performance grinding media specially designed for mining and mineral processing applications. Manufactured from premium alloy steel through advanced forging and heat treatment processes, JUNDA grinding balls provide excellent hardness, superior impact toughness and uniform hardness distribution.

With low breakage rate and outstanding wear resistance, JUNDA forged grinding balls are widely used in ball mills and SAG mills for copper, gold, iron ore and other mineral processing plants, helping customers reduce grinding media consumption and improve mill efficiency.

Materials: High-Carbon Alloy Steel (B2, B3, 60Mn, 65Mn, etc.)
Size Range: Ø20 mm - Ø150 mm (0.6" - 6")
Hardness: HRC 55 - 65 (Surface to Core Consistency)
Impact Toughness: ≥12 J/cm²: AK ≥ 12 J/cm²
Breakage Rate: ≤ 1% (Zero Fragmentation Goal)
Drop Test: ≥20,000 cycles at a drop height of 8 m.
 

Product Parameters

 

Forged (Rolled) Steel Ball Classification and Chemical Composition
Name	C	Mn	Si	S	P	Cr
45#	0.42-0.48	0.50-0.80	0.17-0.37	0.35max	0.35max	0.15max
50Mn	0.48-0.56	0.65-1.00	0.17-0.37	0.35max	0.35max	0.15max
60Mn	0.57-0.65	0.70-1.10	0.17-0.37	0.35max	0.35max	0.25max
65Mn	0.62-0.75	0.90-1.20	0.17-0.37	0.35max	0.35max	0.25max
GCr15 (Chrome)	0.95-1.05	0.25-0.45	0.15-0.35	0.020max	0.027max	1.40-1.65
B2	0.75-0.85	0.70-0.90	0.17-0.35	0.35max	0.35max	0.40-0.60
B3	0.50-0.65	0.40-1.00	1.35-1.85	0.35max	0.35max	0.80-1.20
B5	0.80-1.00	0.70-1.10	0.15-0.35	0.030max	0.030max	0.80-1.20
B6	0.95-1.15	0.60-1.00	0.15-0.35	0.030max	0.030max	1.20-1.80
BL	0.55-0.75	0.65-0.85	0.15-0.35	0.35max	0.35max	0.70-1.20
BG	0.90-1.05	0.35-0.95	0.15-0.35	0.35max	0.35max	1.0-1.70

 

Item	B2 Forged Steel Grinding Balls	B3 Forged Steel Grinding Balls
Ore Type	Copper Ore, Gold Ore, Iron Ore	Copper Ore, Gold Ore, Iron Ore
Grinding Stage	Primary & Secondary Grinding	Secondary & Fine Grinding
Mill Type	SAG Mills & Ball Mills	SAG Mills & Ball Mills
Typical Application	High-impact grinding environments	High-abrasion grinding environments
Key Advantage	Excellent balance of hardness, toughness and wear resistance	Higher wear resistance with good impact toughness

How to Choose Forged Steel Grinding Balls for Copper, Gold and Iron Ore Mining Ball Mills?

Mining Application

Ore Characteristics

Recommended Grinding Ball Material

Recommended Size

Key Performance Requirements

JUNDA Solution Advantages

Copper Ore Mining

Hard rock, high abrasion, continuous impact grinding

B2 / B3 / 40Cr

80-150mm for SAG Mill
50-100mm for Ball Mill

High impact toughness, wear resistance, low breakage rate

Optimized alloy composition provides excellent toughness and wear resistance, suitable for large copper concentrators

Gold Ore Mining

Hard ore, fine grinding requirement, high grinding efficiency demand

B2 / B3

40-100mm

Stable hardness, uniform wear, long service life

Uniform hardness distribution ensures consistent grinding performance and reduces media consumption

Iron Ore Processing

High hardness ore, large throughput, heavy-duty grinding

B3 / B4 / 40Cr

100-150mm for SAG Mill
60-120mm for Ball Mill

High impact resistance, strong deformation resistance, excellent wear performance

Dense internal structure and high toughness reduce breakage under heavy impact conditions

Large SAG Mill Application

High impact environment, large diameter mill

B3 / B6 / High Toughness Alloy Steel

100-150mm

Impact toughness is the most important factor

Forging process improves internal density and impact resistance, suitable for high-impact grinding

Large Ball Mill Application

Continuous grinding, high consumption of grinding media

B2 / B3

60-120mm

Balanced hardness and toughness

Good balance between wear resistance and impact resistance, helping reduce grinding costs

Secondary Grinding / Fine Grinding

Smaller particle size requirement

B2 / 60Mn / 40Cr

20-60mm

Good wear resistance and stable grinding efficiency

Flexible material selection according to ore hardness and mill conditions

 

 

Material	Hardness	Main Advantage
45# / 50Mn	52-62 HRC	Toughness & economy
60Mn / 65Mn	55-64 HRC	Hardness & wear resistance
GCr15	58-65 HRC	Excellent wear resistance
B2	60-66 HRC	Hardness & impact toughness
B3	60-65 HRC	Impact toughness & wear resistance
B5 / B6	60-65 HRC	High wear resistance
BL / BG	55-65 HRC	Balanced performance

 

 

 

Product features

Why Choose Us?

Large-scale reliability (100,000 tons capacity): We are not just suppliers; we are partners. With a production capacity of up to 100,000 tons, we are specifically designed to meet the large-scale demands of global top-level mining and cement enterprises, ensuring stable and uninterrupted supply.

Precision Engineering (Automation Excellence): Our advanced automated production lines eliminate human errors, ensuring consistent superior quality from the surface to the core. This enables your milling machines to operate at optimal efficiency and have predictable wear rates.

Agile Supply Chain (14-day Delivery): In the mineral processing industry, time is money. Our efficient fulfillment system can achieve a minimum delivery lead time of 14 days, helping you reduce inventory costs and respond quickly to operational needs.

Scientifically rigorous (independent laboratory testing): Each ball is a commitment. Our professional laboratory is equipped with the latest OES spectrometer and Rockwell HRC hardness tester, and conducts 100% inspection of every batch. You will receive complete traceable records and enjoy the guarantee of the highest quality standards.

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 ISO 9001 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, including 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 a current product from our catalog or seeking engineering assistance for your application, you can talk 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 across Sand Blasting, Surface Preparation, and Corrosion Control industries.

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

 

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 are your terms of payment?
A:We offer convenient T/T payment options: 30% upfront and 70% upon receipt of the copy of the 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, guaranteeing consistent wear resistance and helping ensure consistent wear throughout the grinding 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 from 20mm to o150mm. The dimensional tolerance is controlled within +0.3mm to+1.0mm, and the sphericity/ellipticity is 0.2mm. 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.

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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