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High, medium and low chromium casting

Chemical Composition

Name	Designation	Chemical Composition (%)
Name	Designation	C	Si	Mn	Cr	Mo		Cu	Ni	P	S
High Chromium Cast Grinding Balls	ZQCr26	2.2-2.7	1.0	1.8-2.5	23-29	0-1.0		0-0.4	0-1.5	0.1	0.1
	ZQCr20	2.2-2.8	1.0	1.8-2.3	20-25	0-0.8		0-0.4	0-1.5	0.1	0.1
	ZQCr15	2.3-2.9	1.0	1.5-2.0	13-20	0-0.5		0-0.3	0-0.5	0.1	0.1
	ZQCr13	2.5-3.0	1.0	1.5-2.0	10-15	0-0.5		0-0.3	0-0.5	0.1	0.1
Medium Chromium Cast Grinding Balls	ZQCr7	2.1-3.2	0.5-1.5	0.5-1.5	5-8		0-0.7	0-0.5	0.6	0.1	0.1
Low Chromium Cast Grinding Balls	ZQCr2	2.5-3.2	0.5-1.3	0.5-1.5	0.8-3.0		0-0.3	0-0.3	0.3	0.1	0.1
Ductile Cast Iron Grinding Balls	ZQSi3	2.5-3.4	1.5-2.5	1.0-2.0	0-0.7		0-0.5	0-0.3	0.3	0.1	0.07
Complex Alloy Cast Grinding Balls	ZQCr4	2.5-3.4	0.4-1.2	0.4-1.2	3.0-4.5		0-0.8	0-0.4	0.5	0.1	0.1

Properties

Name	Designation	Hardness(HRC)	Life span of fatigue of falling balls(times)
High Chromium Cast Grinding Balls	ZQCr26	62	60	12000
	ZQCr26	62	50	15000
	ZQCr20	62	60	10000
	ZQCr20	62	50	12000
	ZQCr15	60	60	10000
	ZQCr15	60	50	12000
	ZQCr13	56	60	10000
	ZQCr13	56	50	12000
Medium Chromium Cast Grinding Balls	ZQCr7	48	60	11000
Low Chromium Cast Grinding Balls	ZQCr2	46	60	8000
Complex Alloy Cast Grinding Balls	ZQCr4	47	60	8000
Ductile Cast Iron Grinding Balls	ZQSi3	44	50	12000

Specification

Metallographic structure and Specific Property of the Cast Grinding Balls

Designation	Metallographic structure	Specific Property
ZQCr26	M 7 C 3 carbide+secondtime carbide+Martensite+left austenite	It have fine feature of wear-resistant anti-crushed and anti-corroding. Suitable for large diameter which are widely used in large heat and power plant and imported mill.
ZQCr20 ZQCr15	M 7 C 3 carbide+secondtime carbide+Martensite+left austenite
ZQCr13	M 7 C 3 carbide+secondtime carbide+Martensite+left austenite or M 7 C 3 carbide+pearlite	Suitable for large diameter mill
ZQCr7	M 7 C 3 +MC 3 +pearlite	Suitable for middle and small diameter mill
ZQCr2	M 7 C 3 +pearlite	Suitable for middle and small diameter mill
ZQSi3	Ductile iron+Martensite+left austenite or ductile iron+bainite+martensite+left austenite	Suitable for titanium dioxide plant and chemical plant

The diameter is longer than 3.2m, which is large type of mill.

Chemical Composition (%)

High Chromium Alloy Casting Bars	C	Si	Mn	Cr	Mo	S	P
	1.5-3.2	0.5-1.2	1.3-2.0	10-13	0-0.3	0.1	0.1
	Cu	Ni	V	Ti	Zr	NP
	0-0.2	0-0.2	0-0.2	0-0.2	0-0.2	0-0.2	0-0.2
Low Chromium Alloy Casting Bars	C	Si	Mn	Cr	Mo	S	P
	2.5-3.5	1.0-1.7	0.3-0.7	0.3-1.0	0-0.3	0.12	0.12
	Cu	Ni	V	Ti	Zr	NP
	0-0.2	0-0.2	0-0.2	0-0.2	0-0.2	0-0.2	0-0.2

Specification

High Chromium Alloy Casting Bars	8��8-10	10 �� 10-12	12 �� 12-14	14 �� 14-16	16 �� 16-18
High Chromium Alloy Casting Bars	18 �� 18-20	20 �� 20-25	25 �� 30	30 �� 35	35 �� 40
Low Chromium Alloy Casting Bars	8��8-10	10 �� 10-12	12 �� 12-14	14 �� 14-16	16 �� 16-18
Low Chromium Alloy Casting Bars	18 �� 18-20	20 �� 20-25	25 �� 25- 30	30 �� 35	35 �� 40

Mechanical Properties

Name	Metallographic structure	Non-notched impact strength (J/cm)	HRC
High Chromium Alloy Casting Bars	M+C	3.0	56-62
Low Chromium Alloy Casting Bars	P+C	1.5	45-50
M-Martensite P-Pearlite C-Carbide