Steel balls for grinding are produced in a range of 60-100mm diameter. They are used in ore grinding mills, such as SAG (Semi Autogenous Grinding) mills when it is for initial grinding or ball mills for regrinding.

The most common applications of these steel balls are in gold, copper, iron, zinc, nickel and silver mining. Different hardness level of the product can be used depending on metal ore in order for grinding to be optimized.

During the manufacturing process Vacuum Degasser is used so to ensure high quality of final product by lowering its hydrogen and nitrogen content.

GENERAL FEATURES

TYPE Hot-Rolled Steel Balls for Grinding
FORM-DIMENSIONS Diameters form 60 to 100 mm
SURFACE HARDNESS As per Brinel & Rockwell
PACKING Steel Drums, Big Bags, Bulk
DIMENSIONS, WEIGHT & TOLERANCES According to FN-SPP-03-12

 

Steel Chemical composition

Steel Grade C Mn Si P S Cu Cr Ni Al Standard
max max max max max
1 С45 0,42-0,50 0,50-0,80 max 0,40 0,05 0,05 0,4 0,4 0,4 EN10083-2
2 70*80 0,70-0,85 0,70-1,2 0,30-0,50 0,04 0,04 0,4  0,30-0,60 0,3 0,010-0,06

Grade C45 only for Normal (H),increased (П) and high (B)
Other grades and chemical composition are possible upon request and are considered as special production.

 

Dimensional features

Diameter (mm) Tolerance (mm) Volume (cm3) Weight (kg)
60 (+2,0/-2,0) 113,12 0,888
70 (+2,0/-2,0) 179,62 1,41
80 (+3,0/-2,0) 268,02 2,104
90 (+3,0/-3,0) 381,66 2,996
100 (+4,0/-3,0) 523,57 4,11

 

Surface Hardness

Nominal Diameter (mm) Surface hardness as per Rockwell – HRC (Brinel – HB) not less than:
Normal (H) Increased (Π) High (Β) Very High (Μ) Ultra High (U)
60 401 (43) 461 (48) 534 (53) 601 (57) 712
70 401 (43) 461 (48) 514 (52) 578 (56) 653
80 401 (43) 461 (48) 495 (51) 555 (55) 627
90 352 (38) 375 (40) 461 (48) 534 (53) 578
100 352 (38) 375 (40) 415 (44) 495 (51) 514

Higher hardness is possible upon request and is considered as special production.

STOMANA INDUSTRY SA (PERNIK) – Export Dept.

Address: 1, Vladaisko Vastanie str.
Postal Code: BG-2304
City: Pernik
Country: BULGARIA
Telephone: +359-76-681023
Fax: +359-76-681951
Person In Charge Kamelia Asenova
e-mail: export@stomana.bg

 

SIDENOR SA (ATHENS) – Export Dept.

Address: 33, Amaroussiou-Halandriou str., Maroussi
Postal Code: GR-15125
City: Athens
Country: GREECE
Telephone: +30-210-6787710
Fax: +30-210-6787740
Person In Charge Thomas Malakis
e-mail: tmalakis@sidenor.vionet.gr