B3 Forged Grinding Balls For Ball Mill

20-180mm B3 Forged Grinding Balls For Ball Mill

Material: Steel 60Mn2,B2,B3,B4 etc
Size:20-180mm
Impact Test: ≥12J/cm2
Standard:YB/T091-2005
Surface Hardness: 62-65 HRC
Heat treatment: Quenching Hardening
Technology: Forged
Used: Mine Mill, Cement Plant,Gold Mining,Copper Mining,Iron Ore Mining,Power Station and other industries
Package:Bags,Steel drums,Containers

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Product Detail

Forged Ball Composition Hardness Table

Ingredients/Products	B6	B3	N-B2	B2	60Mn	40Cr	40Mn2	45#
C	0.65-0.85	0.58-0.66	0.75-0.84	0.75-0.84	0.58-0.65	0.37-0.44	0.37-0.44	0.42-0.5
Si	0.15-0.45	1.6-1.9	0.15-0.37	0.17-0.37	0.17-0.37	0.17-0.37	0.17-0.37	0.17-0.37
Mn	0.8-1.2	0.7-0.8	0.8-0.92	0.8-0.92	0.6-1.2	0.5-0.8	1.4-1.8	0.5-0.8
P&S	0.015	Max0.025	Max0.030	Max0.035	Max0.035	Max0.035	Max0.035	Max0.035
Cr	0.6-1.1	0.75-0.9	0.65-0.75	0.5-0.65	Max0.025	0.8-1.1	Max0.30	Max0.25
Surface Hardness	58-60	57-60	58-62	58-62	55-58	55-57	50-55	50-55
Center Hardness	55-57	54-56	58-59	58-59	40-45	35-42	30-35	30-35

Production Process

Round steel →Automatic conveying →Medium frequency induction furnace heating →Rotary cutting and roll forging into balls →Quenching→Heat preservation and tempering → Refrigeration and cooling →Sampling inspection →Finished product packaging

Quenching： Improve the hardness and wear resistance of steel balls.

Tempering：Reduce brittleness, eliminate or reduce internal stress. There is a large internal stress and brittleness of steel parts after quenching. The hardness can be adjusted through proper tempering to reduce brittleness and obtain the required toughness and plasticity.