65Mn and B2 20-100 mm Forged Steel Grinding Balls for Cement Clinker Mills

• Customization: Available
• Material: 65mn; B2
• Content: >90%
• Model NO.: 20-100 mm Forged Steel Ball
• Usage: Grind, Cement Clinker Mills
• Processing Type: Forged and Hot-Rolled
• Size: 20 mm to 100 mm
• Color: Black
• Customized: Customized
• Product Name: Forged Steel Ball
• Surface Hardness: 59-65 HRC
• Core Hardness: 57-63 HRC
• Packaging Details: Iron Drum/Ton Bag
• Standard: ISO 9001: ISO 14001: ISO 45001
• Transport: by Sea
• Experience: 20 Years
• Business Type: Factory
• Application 1: Cement Plant
• Application 2: Cement Clinker Mills
• Transport Package: Drum/Ton Bag
• Specification: 20 mm to 100 mm
• Trademark: JUNDA
• Origin: China
• HS Code: 7326110000
• Production Capacity: 100, 000 Tons/Year
• Package Size: 75.00cm * 75.00cm * 70.00cm
• Package Gross Weight: 1002.000kg

Product Description

65Mn B2 20-100 mm Forged Steel Grinding Balls for Cement Clinker Mills with Stable Wear Performance
Update:June 25th, 2026
Forged Grinding Balls for Cement Clinker Mills

Our 65Mn and B2 forged steel grinding balls are specially engineered for cement clinker grinding, where continuous operation, stable wear behavior and low media consumption are critical to mill efficiency.

Manufactured from premium alloy steel bars through precision forging and advanced quenching & tempering technology, every grinding ball features high hardness, excellent toughness and consistent microstructure, ensuring reliable performance throughout long production cycles.

Compared with conventional grinding media, our forged steel balls can help improve grinding efficiency, reduce grinding media consumption, and maintain stable grinding performance.

Suitable for:
Cement Clinker Ball Mills
Closed-Circuit Cement Grinding Systems
Finish Grinding Mills
Cement Grinding Stations
Cement Manufacturing Plants

Product Attributes

Field	Value
Product Name	65Mn / B2 Forged Steel Grinding Balls for Cement Clinker Mill
Material	65Mn (Chamber 1); B2 (Chamber 2 / High-Impact)
Size Range	Ø20mm to Ø100mm (standard);
Surface Hardness	65Mn: 59-63 HRC | B2: 62-65 HRC
Core Hardness	65Mn: 54-61 HRC | B2: 58-63 HRC
Impact Toughness	≥12 J/cm²
Crushing Rate	<1%
Application	Cement Clinker Ball Mill - Chamber 1 & Chamber 2
Processing Type	Forged (Air Hammer) + Quench & Temper
Standard	ISO 9001; ISO 14001; ISO 45001;
Packaging	1,000 kg Iron Drum / Ton Bag
Production Capacity	100,000 Tons/Year
Lead Time	14 Working Days (Standard)
MOQ	500 kg
HS Code	7326110000

Product Overview - Why Cement Clinker Mills Need Grade-Matched Media

Cement tube mills operate in two fundamentally different load regimes. Using the same ball grade across both chambers is a common cost-saving measure that backfires: the wrong grade either wears too fast (wasting media budget) or fractures under impact (contaminating cement product).
 

4.1  Chamber 1 - Impact-Dominated Coarse Grinding

Clinker enters Chamber 1 at 25-35mm particle size. Large balls (Ø60-90mm) break clinker through high-energy impact. The primary failure mode is breakage, not abrasion. 65Mn's higher toughness (Mn content 0.90-1.20%) resists impact fracture while delivering HRC 59-63 hardness - sufficient for clinker abrasion. At this load profile, the additional alloy cost of B2 returns no measurable benefit.
 

4.2  Chamber 2 - Abrasion-Dominated Fine Grinding

Chamber 2 receives pre-crushed material at 2-5mm and grinds to target fineness (Blaine 3,000-4,500 cm²/g). Small balls (Ø20-50mm) work by attrition. The critical requirement is hardness stability through the full wear cycle - a ball that softens at its core will accelerate wear in the second half of its service life, shifting the Blaine target and forcing unplanned ball top-ups.
B2 (Cr 0.2-0.6%) provides superior through-section hardness uniformity vs. 65Mn in this size range. Surface-to-core HRC difference ≤3 ensures the wear rate stays linear from first use to retirement.
 

Ball Size Selection - Cement Clinker

Chamber	Feed Size	Target	Ball Size	Recommended Grade
Chamber 1 (coarse)	25-35mm clinker	P80 2-5mm	Ø60-90mm	65Mn (standard) / B2 (high-impact mills)
Chamber 2 (fine)	2-5mm	Blaine 3,000-4,500	Ø20-50mm	B2 (preferred) / 65Mn (cost-priority)

Why Choose 65Mn / B2 for Cement Clinker Grinding?

Optimized Materials for High-Efficiency Cement Production

Cement clinker contains highly abrasive minerals that continuously wear grinding media during milling.

Selecting the appropriate material directly affects:

Grinding efficiency
Ball consumption
Mill productivity
Maintenance interval
Production cost

65Mn Steel

Recommended for standard cement grinding conditions where excellent toughness and cost efficiency are required.

Advantages

Good wear resistance
High impact toughness
Stable operating performance
Economical solution
Long service life
 

 

B2 Alloy Steel

Recommended for high-output mills or higher abrasion conditions.

Advantages

Higher hardness
Superior wear resistance
Lower wear rate
Longer replacement interval
Reduced grinding media consumption
 

Grade Comparison - 65Mn vs. B2 for Cement Grinding

Property	65Mn	B2	Recommendation
Mn content	0.90-1.20%	0.30-1.20%	65Mn: higher Mn = better toughness for large-ball impact
Cr content	≤0.25%	0.2-0.6%	B2: Cr improves through-hardening in smaller diameters
Surface HRC	59-63	62-65	B2 achieves higher hardness ceiling
Core HRC	57-61	60-63	B2 maintains higher core hardness at Ø50mm+
Toughness	Higher	Good	65Mn preferred where impact load dominates (Chamber 1)
Through-section uniformity	Good (small dia.)	Excellent	B2 preferred for Chamber 2 wear stability
Cost	Lower	Moderate	65Mn saves 10-20% on Chamber 1 media cost
Best application	Chamber 1: Ø60-90mm	Chamber 2: Ø20-50mm	Use both grades together for optimal total cost

Technical Parameters

Size & Hardness - 65Mn Grade (Chamber 1 / Coarse Grinding)
Size	Inch	Weight (kg)	Tol. (mm)	Grade	Surface HRC	Core HRC	Application
Ø20	3/4"	0.037±0.005	±1	65Mn	59-62	57-60	Chamber 2
Ø25	1"	0.072±0.010	±1	65Mn	59-62	57-60	Chamber 2
Ø30	1-1/4"	0.130±0.020	±1	65Mn	59-63	57-61	Chamber 2
Ø40	1-1/2"	0.300±0.040	±1	65Mn	60-63	58-61	Chamber 2
Ø50	2"	0.600±0.050	±1.5	65Mn	60-63	58-61	Ch.1 / Ch.2
Ø60	2-1/2"	1.000±0.050	±1.5	65Mn	60-63	58-61	Chamber 1
Ø70	2-3/4"	1.600±0.060	±2	65Mn	59-62	57-60	Chamber 1
Ø80	3"	2.100±0.060	±2	65Mn	59-62	57-60	Chamber 1
Ø90	3-1/2"	3.000±0.070	±2	65Mn	58-61	56-59	Chamber 1
Ø100	4"	4.100±0.150	±2	65Mn	57-61	54-57	Chamber 1 (large mill)

 

Size & Hardness - B2 Grade (Chamber 2 / High-Impact Configuration)
Size	Inch	Weight (kg)	Tol. (mm)	Grade	Surface HRC	Core HRC	Application
Ø20	3/4"	0.037±0.005	±1	B2	63-66	62-65	Chamber 2
Ø25	1"	0.072±0.010	±1	B2	63-66	62-65	Chamber 2
Ø30	1-1/4"	0.130±0.020	±1	B2	63-66	62-65	Chamber 2
Ø40	1-1/2"	0.300±0.040	±1	B2	62-66	62-65	Chamber 2
Ø50	2"	0.600±0.050	±1.5	B2	62-65	61-64	Ch.1 / Ch.2
Ø60	2-1/2"	1.000±0.050	±1.5	B2	62-65	60-62	Chamber 1
Ø70	2-3/4"	1.600±0.060	±2	B2	61-64	59-62	Chamber 1
Ø80	3"	2.100±0.060	±2	B2	61-63	59-62	Chamber 1
Ø90	3-1/2"	3.000±0.070	±2	B2	60-63	58-61	Chamber 1
Ø100	4"	4.100±0.150	±2	B2	60-63	58-61	Chamber 1 (large mill)

Note: Diameters Ø110mm, Ø120mm, Ø125mm, Ø130mm, Ø140mm, Ø150mm available on request - suitable for oversized tube mills, raw material mills, or non-cement applications. Contact us with your mill specifications.
 

Chemical Composition
Grade	C%	Si%	Mn%	Cr%	P%	S%
65Mn	0.62-0.70	0.17-0.37	0.90-1.20	≤0.25	≤0.035	≤0.035
B2	0.72-1.03	0.15-0.35	0.30-1.20	0.2-0.6	≤0.035	≤0.035

 

Application Scenarios

1  Standard Two-Chamber Cement Tube Mill

The most common configuration. Chamber 1 (Ø60-90mm, 65Mn) handles clinker breakage from 25-35mm feed; Chamber 2 (Ø20-50mm, B2) finishes to target Blaine fineness. Using grade-matched media in each chamber reduces total media consumption per tonne of cement by 8-15% vs. a single-grade charge.
 

2  High-Output Mill with Elevated Impact Loads

Larger diameter mills (Ø4.5-5m) running at higher circulating loads generate greater ball-to-ball and ball-to-liner impact energy. In these conditions, B2 is recommended for Chamber 1 as well, replacing 65Mn to ensure full-section hardness uniformity under the elevated impact regime.

3  Extended Size Range for Other Mill Types

For raw material mills, slag mills, or oversized tube mills requiring ball diameters above Ø100mm, we supply 65Mn and B2 up to Ø125mm and B2/B3 up to Ø150mm. Please provide your mill internal diameter, effective length, and feed material hardness for a tailored recommendation.

 

 

 

 

 

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's the delivery time?
A : 5-10 working days after receiving the customer's payment.
 
Q2: What is the packaging?
A: Iron Drum / Ton Bag
 
Q3: Do you provide technical support?
A: Yes. We have a professional technical support team to provide timely assistance and prepare technical documents according to your requirements.
 
Q4: What's the payment method?
A: T/T, Western Union, MoneyGram, L/C, etc.