low price high hardness mill ball: 1) High hardness 2) Low breakage 3) Good wear-resistant 4) Steady performance

low price high hardness mill ball:

1.Chemical composition

Item	C	Cr	Si	Mn	S	P	Cu	Mo	Hardness
Low Chrome	1.8-3.5	1-3.5	≤1.2	≤1.5	≤0.15	≤0.15	≤0.5	≤1.0	≥45
Medium Chrome	1.8-3.3	4-9	≤1.2	≤1.8	≤0.15	≤0.15	≤1.0	≤1.5	≥50
High Chrome	1.6-3.3	10-15	≤1.0	≤2.5	≤0.10	≤0.10	≤1.5	≤1.0	≥55
Higher Chrome	1.6-3.3	15-18 18-27	≤1.0	≤2.5	≤0.10	≤0.10	≤1.5	<2.0	≥60

 

2. Specification

 

No.	Diameter (mm)	Weight of each (kg)	Pcs/ton
1	Ø10	0.0135	74073
2	Ø12	0.0181	55248
3	Ø15	0.0242	41322
4	Ø20	0.0322	31056
5	Ø25	0.063	15873
6	Ø30	0.11	9091
7	Ø40	0.257	3891
8	Ø50	0.50	2000
9	Ø60	0.867	1153
10	Ø70	1.37	729
11	Ø80	2.05	487
12	Ø90	2.90	345
13	Ø100	4.00	250
14	Ø110	5.30	188
15	Ø120	6.80	147
16	Ø125	7.75	129
17	Ø130	8.74	114

 

3. Product Description

 

Model	Mechanical properties		Microstructure
	HRC	Times of falling (3.5m)
Low Chromium	≥45	≥8000	P+C
Medium Chromium	≥50	≥12000	P+C
High Chromium	≥55	≥15000	M+C
Higher Chromium	≥60	≥22000	M+C

 4. Features

1) High hardness and resistance 2) Good even wear 3) No breaking

5. Applied fields1) Mining2) Cement plants 3) Power stations 4) Chemical industry and machinery

6. Production Process

    The production of casting steel balls is to melt the waste raw material such as waste steel, waste iron with medium frequency induction furnace. In the process of melting, add suitable amount of precious metal alloys(such as Ferrochrome, ferromanganese, ferro-vanadium ) to the furnace. When the temperature of the molten iron is more than 1550°C and can meet the requirements of the technics,pour the qualified molten iron to steel moulds or steel production line moulds. The content of chrome of high chrome alloy casting steel balls is ≥10.0%, the content of carbon is 1.80%-3.20%.      Since the national standards require the HRC≥58, ak≥3.0J/cm2, to up to this hardness, the high chrome balls must be quenched and tempered. After quenched and tempered, the hardness(HRC≥60) is higher, the wear-resistance is more than 2.5 times of forging balls.

7. Production Technics

    Raw material(waste steel,waste iron,iron alloy)factory inspection→blending→melt→composition inspection→casting→cooling and solidification→demould→clean and polish→inspection→quenching(increase hardness)→hardness inspection→tempering(eliminate stress)→inspection→warehousing

Dia 130mm low price high hardness mill ball