Brinell To Rockwell

Check here various Brinell To Rockwell Hardness Conversion

Different Conversion of Brinell To Rockwell C Conversion, Brinell To Rockwell B Conversion and Brinell To Rockwell Chart

Seamless Pipe

Seamless Pipe

Welded Pipe

Welded Pipe

ERW Pipe

ERW Pipe

Difference Between Brinell and Rockwell Hardness

  • Indenters of  Brinell and Rockwell Hardness
    • In case of Brignell’s method, the penetrator is a calcareous ball (for hardness up to 450HB) or hard metal (for hardness up to 650HB) of diameter D, which is emitted by force F in the surface layers of the material. The standard diameters of balls are 10, 5, 2.5, 2 and 1 mm.
    • In Rockwell’s method several types of penetrators are used: for soft materials, a small steel ball (HRB method) is used, for hard materials a diamond cone (HRC method). The diamond cone has a peak angle of 1200 and a radius of 0.2 mm round, while the diameter of the steel balls is 1/16″, 1/8″, 1/4″ and 1/2″.

  • Duration of  Brinell and Rockwell Hardness
    • The Brinell test is very slow (30 – 60sec).
    • Rockwell’s test is shorter (10 – 15sec).

  • Calculation of  Brinell and Rockwell Hardness
    • Brinell’s Hardness (HB) is the ratio of the applied force F (N) and the surface of the fingerprint S (mm2): HBW = (F*0.102/ S); S = π* D* h.
    • In Rockwell’s method HRB = 130 – (e/0.002); HRC = 100 – (e/0.002)

  • Application of  Brinell and Rockwell Hardness
    • The Brinell method is used for soft and medium hard materials.
    • Rockwell’s test is used for soft and medium hard materials (aluminum, soft steel, Cu alloys etc.)

  • Advantages of  Brinell and Rockwell Hardness
    • Advantages of Brinell’s method is the simple surface preparation and the easy measurement of the print diameter.
    • Rockwell method is faster, there is higher speed immediate reading of hardness on the device and the test leaves shallow imprint.

  • Disadvantages of  Brinell and Rockwell Hardness
    • Disadvantages of Brinell’s method are that hardness of ≥ 650 HB cannot be measured; the hardness is dependent on the load and according to X (degree of load) so it is necessary to choose the appropriate force F; after the measurement, the impression is large and leaves a visible trace.
    • For Rockwell’s test there is the possibility of a cone breakage and the imprecision ± 2 HRB / HRC.
  • Rockwell Hardness Test
    • Quick and cost-effective process
    • The Rockwell hardness is based on difference of indentation depth of indenter from two different load applications.
    • Not always the most accurate hardness testing method
    • No specimen preparation required
    • Ball Indenter 1/16 , 1/8 , 1/4 and 1/2 inches diameter.
    • Testing Load - Two loads Minor 10Kgf, Major 60 -100-150 Kgf
    • Hardness value is directly readable , no optical evaluation required
    • Non-destructive testing
    • First minor load is applied to achieve zero level then major load is applied for specific period.
    • Indenter Size - Conical diamond indenter with 120° Included angle.

  • Brinnel Hardness Test
    • In Brinell hardness test hard ball indenter is pressed under load on surface of material.
    • Indenter- Ball indenter e.g. 1mm, 2.5mm, 5mm and 10mm ball diameter
    • High risk of deforming the materials to be tested when testing in micro range with very high test loads.
    • Teating Load - Single load from 1kgf to 3000 Kgf
    • Process is very slow ( the test cycle takes somewhere between 30 and 60 seconds )
    • It can be applied on thin specimens of very hard materials.
    • Can be used to test non-homogenous materials ( castings ).
    • Surface quality of the metal must be very good because the indent is measured optically.
    • Brinell hardness number is expressed as ratio of load and area of indentation.

Hardness ranges for heat treated steel

Heat
Treated
Condition
Q R S T U V W X Z
Tensile
Strength

625-775 n/mm2

700-850 n/mm2

775-925 n/mm2

850-1000 n/mm2

925-1075 n/mm2

1000-1150 n/mm2

1075-1225 n/mm2

1150-1300 n/mm2

1550 n/mm2

Hardness
Brinell
179-229 201-225 223-277 248-302 269-331 293-352 311-375 345-401 444

HARDNESS CONVERSION TABLE

Brinell
Hardness
Rockwell Hardness Tensile
Strength
A Scale B Scale C Scale
3000KG Ball 60KG 100KG 150KG (Approx.)
400 72.0 43.1 202,000
388 71.4 41.8 195,000
375 70.6 40.4 188,000
363 70.0 39.1 182,000
352 69.3 110.0 37.9 176,000
341 68.7 109.0 36.6 170,000
331 68.1 108.5 35.5 166,000
321 67.5 108.0 34.3 160,000
311 66.9 107.5 33.1 155,000
302 66.3 107.0 32.1 150,000
293 65.7 106.0 30.9 145,000
285 65.3 105.5 29.9 141,000
277 64.6 104.5 28.8 137,000
269 64.1 104.0 27.6 133,000
262 63.6 103.0 26.6 129,000
255 63.0 102.0 25.4 126,000
248 62.5 101.0 24.2 122,000
241 61.8 100.0 22.8 118,000
235 61.4 99.0 21.7 115,000
229 60.8 98.2 20.5 111,000
223 97.3 18.8 109,000
217 96.4 17.5 105,000
212 95.5 16.8 102,000
207 94.6 15.2 100,000
201 93.8 13.5 98,000
197 92.8 12.7 95,000
192 91.9 11.5 93,000
187 90.7 10.0 90,000
183 90.0 9.0 89,000
179 89.0 8.0 88,000
174 87.8 6.4 86,000
170 86.8 5.4 84,000
167 86.0 4.4 83,000
163 85.0 3.3 82,000
156 82.9 80,000
149 80.8 73,000
143 78.7 71,000
137 76.4 67,000
131 74.0 65,000
126 72.0 63,000
121 69.8 60,000
116 67.6 58,000
111 65.7 56,000