Castings And Forgings Steel Ball With HRC58-66 For Mining Machine
1. Preparation method of grinding steel ball:
Low chromium steel ball is the most important grinding body in ball
mill, which is called grinding steel ball abroad. Low chromium
steel balls are produced by medium frequency electric furnace
melting, metal mold or sand casting, so domestic wear-resistant
material manufacturers often called low chromium alloy casting
balls.
Castings And Forgings
2. Technical standard of grinding steel ball:
(1) Hardness test is the most important data for whether the
grinding steel ball is wear-resistant, which can be tested by
Rockwell hardness tester. Practice shows that the service life of
steel balls with HRC60 and above is more than twice of HRC40-50.
(2) Low chromium steel ball refers to chromium content ≤3.0%,
carbon content between 1.80%-3.30% of the steel ball is low
chromium ball, the national standard requirements of low chromium
ball hardness (HRC) must be ≥45 degrees above, if the use of low
chromium ball quality recommendations must use heat treatment
tempering or vibration aging treatment. If the test hardness (HRC)
is below 40 degrees, the low chromium ball hardness is insufficient
or overburning.
(3) Application field:
Grinding steel balls are widely used in metallurgical mines, cement
building materials, thermal power generation, flue gas
desulfurization, aerated concrete, magnetic materials, chemical
industry, coal water slurry, pellets, slag, ultrafine powder, fly
ash, calcium carbonate, quartz sand and other industries.
Castings And Forgings
3. Specification of grinding steel ball:
| Inch | Size | T weight(Kg) | Actual Diameter Range (mm) | Material | Surface hardness (HRC)+/-0.5
HRC | Core hardness (HRC)+/-0.5
HRC | Volume
Hardness (HRC)+/-0.5
HRC |
| 3/4 ” | D20MM | 0.039+/-0.005 | 19.3~22.3 | B2 | 63-66 | 62-64 | 63-66 |
| 1 ” | D25MM | 0.075+/-0.01 | 24.5~27.5 | B2 | 63-66 | 62-64 | 63-66 |
| 1 1/4 ” | D30MM | 0. 14+/-0.02 | 29.7~32.7 | B2 | 63-66 | 62-64 | 63-66 |
| 1 1/2 ” | D40MM | 0.31+/-0.04 | 39.6~43.6 | B2 | 63-66 | 62-64 | 63-66 |
| 2” | D50MM | 0.59+/-0.05 | 50~54 | B2 | 62-65 | 61-63.5 | 62-65 |
| 2 1/2 ” | D60MM | 1.0+/-0.05 | 60.4~64.4 | B2 | 62-65 | 59-61 | 61-64 |
| 2 1/2 ” | D65MM | 1.25+/-0.07 | 65.6~70.6 | B2 | 62-65 | 59-61 | 61-64 |
| 2 1/2 ” | D65MM | 1.25+/-0.07 | 65.6~70.6 | B3 | 61-63 | 58-60 | 58-62 |
| 3” | D75MM | 1.9+/-0. 1 | 76~81 | B2 | 61-63 | 59-62 | 60-63 |
| 3” | D75MM | 1.9+/-0. 1 | 76~81 | B3 | 61-63 | 58-60 | 58-62 |
| 3 1/2” | D90MM | 3. 1+/-0. 15 | 88~93.5 | B3 | 60-62 | 57-60 | 59-62 |
| 3 3/4” | D94MM | 3.5+/-0.2 | 92~97.5 | B3 | 60-62 | 57-60 | 59-62 |
| 4” | D100MM | 4. 1+/-0.2 | 98~103 | B3 | 60-62 | 57-60 | 59-62 |
| 4.2” | D105MM | 4.76+/-0.2 | 103~108 | B3 | 59-62 | 57-60 | 59-62 |
| 4.5” | D115MM | 6.3+/-0.2 | 113~118 | B3 | 59-62 | 57-60 | 58-62 |
| 5” | D125MM | 8.2+/-0.3 | 123~128.5 | B3 | 58-62 | 57-60 | 58-62 |
Castings And Forgings
Material
| | C | Si | Mn | P≤ | S≤ | Cr | Ni ≤ | Cu≤ |
| B2 | 0.72-0.86 | 0. 15-0.37 | 0.70-0.80 | 0.035 | 0.035 | 0.20-0.60 | 0.25 | 0.25 |
| B3 | 0.58-0.66 | 1.30- 1.90 | 0.40-0.80 | 0.035 | 0.035 | 0.70-0.90 | 0.25 | 0.25 |
Castings And Forgings
Castings And Forgings
Castings And Forgings
