Casting Chrome Steel Ball

✨ Core Advantages

✓ Premium Chrome Alloy: Precise ZCr2 to ZCr26 composition with up to 30% chromium content for maximum wear resistance.
✓ Exceptional Hardness Balance: Advanced EAF smelting and precise heat treatments ensure seamless surface & core hardness.
✓ Industry-Leading Lifespan: Multi-dimensional QC testing ensures a drop fatigue life of ≥ 22,000 times.
✓ 100% Quality Guaranteed: Closed-loop "Double-Gate" inspection strictly rejects and remelts any unqualified products.

🎯 Engineered to significantly lower your single-ton milling costs and support long-term continuous operation.

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Description

2Product Overview

Our wear-resistant casting steel balls are strictly manufactured via advanced electric furnace smelting and precisely monitored thermal treatments. With stable chemical compositions ranging from ZCr2 to ZCr26, they ensure exceptional surface and core hardness balance to significantly lower your single-ton milling costs.

Advanced Manufacturing Process

✓ Precise Melt Control
Electric-furnace smelting paired with real-time spectrum analysis ensures the precise chemical composition of chromium (up to 30%).

✓ Double-Gate Inspection
Features a strict self-inspection and professional recheck system. Any non-qualified semi-finished products are 100% rejected and remelted.

✓ Multi-Dimensional QC Testing
Every batch undergoes 5 rigorous final tests: Hardness, Falling Sphere, Impact, and Metallography, ensuring ≥ 22,000 times fatigue life.

Raw Materials

Strict inspection & grading of incoming steel scrap.

EAF Smelting

Advanced electric arc furnace melting with spectroanalysis.

Precision Molding

Automated sand molding ensures dimensional tolerance.

Dual Heat Treatment

Precise Quenching & Tempering for balanced hardness.

Rigorous QC

100% testing on Hardness, Drop Fatigue & Metallography.

Dispatch

Secure packaging and storage before global shipping.

💡 Quality Assurance: Our closed-loop testing system ensures that any sub-standard semi-finished products are immediately rejected and remelted, guaranteeing 100% qualified products delivery.

Factory Production & Inspection Flowchart

Casting Steel Grinding Balls Process Flow Diagram

Figure: Closed-loop production and rigorous quality inspection flow for premium grinding balls.

Chemical Composition (%)

Grade	C	Si	Mn	Cr	Mo	Cu	Ni	P	S
ZCr26	2.0-3.5	≤1.2	0.3-1.5	23.0-30.0	0-3.0	0-1.2	0-1.5	≤0.10	≤0.06
ZCr20	2.0-3.5	≤1.2	0.3-1.5	18.0-23.0	0-3.0	0-1.2	0-1.5	≤0.10	≤0.06
ZCr15	2.0-3.5	≤1.2	0.3-1.5	14.0-18.0	0-3.0	0-1.2	0-1.5	≤0.10	≤0.06
ZCr12	2.0-3.5	≤1.2	0.3-1.5	10.0-14.0	0-3.0	0-1.2	0-1.5	≤0.10	≤0.06
ZCr8	2.0-3.5	≤1.2	0.3-1.5	6.0-10.0	0-1.0	0-0.8	0-1.5	≤0.10	≤0.06
ZCr5	2.0-3.5	≤1.2	0.3-1.5	3.0-6.0	0-1.0	0-0.8	0-1.5	≤0.10	≤0.10
ZCr2	2.0-3.5	≤1.2	0.3-1.5	1.0-3.0	0-1.0	0-0.8	0-1.5	≤0.10	≤0.10

Mechanical Properties & Microstructure

Grade	Surface Hardness (HRC)	Core Hardness (HRC)	Microstructure	Falling Fatigue Life (Times)	Impact Toughness (J/cm²)
ZCr26	> 58	> 56	M+C	≥ 22000	≥ 6
ZCr20	> 58	> 56	M+C	≥ 22000	≥ 6
ZCr15	> 58	> 56	M+C	≥ 22000	≥ 6
ZCr12	> 58	> 56	M+C	≥ 20000	≥ 6
ZCr8	> 50	> 48	P+C	≥ 15000	≥ 6
ZCr5	> 48	> 46	P+C	≥ 12000	≥ 6
ZCr2	> 46	> 45	P+C	≥ 10000	≥ 6

Full Size Specifications

Diameter (mm)	Single Weight (kg)	Pcs Per Ton	Tolerance (mm)	Diameter (mm)	Single Weight (kg)	Pcs Per Ton	Tolerance (mm)
Φ4.8	0.00064	1562500	±1.0	Φ50	0.50	2000	+1.5 / -1.0
Φ6.32	0.00112	892857	±1.0	Φ60	0.867	1153	+1.5 / -1.0
Φ8	0.00232	431034	±1.0	Φ70	1.37	729	+2.0 / -1.0
Φ10	0.00388	257731	±1.0	Φ80	2.05	487	+2.0 / -1.0
Φ12	0.00771	129702	±1.0	Φ90	2.90	345	+2.3 / -1.0
Φ15	0.015	68273	±1.0	Φ100	4.00	250	+2.3 / -1.0
Φ17	0.021	41982	±1.0	Φ110	5.30	188	+3.0 / -1.0
Φ20	0.034	31056	±1.0	Φ120	6.80	147	+3.0 / -1.0
Φ25	0.063	15873	±1.0	Φ125	7.75	129	+3.0 / -1.0
Φ30	0.11	9091	±1.0	Φ130	8.74	114	+3.0 / -1.0
Φ40	0.257	3891	+1.5 / -1.0	Φ150	13.83	72	+3.0 / -1.0

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