HARDNESS VS MINIMUM THICKNESS CHART 55Rockwell

SuperficialHardness Scales

RockwellRegular

Hardness ScalesAny greaterthickness andhardness can besafely tested onindicated scale

Thicknessinches (mm)

N BraleIndenter

BraleIndenter

.006 (0.15)

.008 (0.20)

.010 (0.25)

.012 (0.30)

.014 (0.36)

.016 (0.41)

.018 (0.46)

.020 (0.51)

.022 (0.56)

.024 (0.61)

.026 (0.66)

.028 (0.71)

.030 (0.76)

.032 (0.81)

.034 (0.86)

.036 (0.91)

.038 (0.96)

.040 (1.02)

15N 30N 45N A D C15kgf

30kgf

45kgf

60kgf

100kgf

150kgf

9290

88837668X

XXXXX

XXXXX

X

--

-82

78.57466

5747XXX

XXXXX

X

--

-77747268

6358513720

XXXXX

X

--

---

8684

8279767167

60XXXX

X

--

-----

7775726863

585143XX

X

--

-----

-69676562

5752453728

20

RockwellSuperficial

Hardness Scales

RockwellRegular

Hardness ScalesAny greaterthickness andhardness can besafely tested onindicated scale

Thicknessinches (mm)

1/16 in BallIndenter

1/16 in BallIndenter

.010 (0.25)

.012 (0.30)

.014 (0.36)

.016 (0.41)

.018 (0.46)

.020 (0.51)

.022 (0.56)

.024 (0.61)

.026 (0.66)

.028 (0.71)

.030 (0.76)

.032 (0.81)

.034 (0.86)

.036 (0.91)

.038 (0.96)

.040 (1.02)

15-T 30-T 45-T F B G15kgf

30kgf

45kgf

60kgf

100kgf

150kgf

9186817568

XXXXX

XXXXX

X

--

807264

554534XX

XXXXX

X

---

7162

534331184

XXXXX

X

-----

--

989185

7769XXX

X

-----

--

948780

7162524028

X

-----

--

948776

6859504231

22

X = No minimum hardness. These are approximate numbers only.

HARDENED STEEL AND HARD ALLOYS

80797877767574737271706968676665646362616059585756555453525150494847464544434241403938373635343332313029282726252423222120

C A D 15-N 30-N 45-N HV HK HB KSI WMNG

60kg

Brale

100kg

Brale

15 kgN

Brale

Superficial

30 kgN

Brale

45 kgN

Brale10 kg

500 gmandover

3000kg

10 mmball

150kg

1/16"ball

1000 lbs/sq in

1000gm

Vickers Knoop BrinellTensile

StrengthMicro-ficialRockwell

150kg

Brale®

92.091.591.090.590.089.589.088.588.087.086.586.085.685.084.583.983.482.882.381.881.280.780.179.679.078.578.077.476.876.375.975.274.774.173.673.172.572.071.570.970.469.969.468.968.467.967.466.866.365.865.364.664.363.863.362.862.462.061.561.060.5

86.585.584.584.083.082.581.581.080.079.578.578.076.976.175.474.573.873.072.271.570.769.969.268.567.766.966.165.464.663.863.162.161.460.860.059.258.557.756.956.255.454.653.853.152.351.550.850.049.248.447.747.046.145.244.643.843.142.141.640.940.1

92.091.591.090.590.089.088.588.087.086.586.085.084.483.682.881.981.180.179.378.477.576.675.774.873.973.072.071.270.269.468.567.666.765.864.864.063.162.261.360.459.558.657.756.855.955.054.253.352.151.350.449.548.647.746.845.945.044.043.242.341.5

96.596.396.095.895.595.395.094.894.594.394.093.593.292.992.592.291.891.491.190.790.289.889.388.988.387.987.486.986.485.985.585.084.583.983.583.082.582.081.580.980.479.979.478.878.377.777.276.676.175.675.074.573.973.372.872.271.671.070.569.969.4

87.086.585.584.583.582.581.580.579.578.577.576.575.474.273.372.071.069.968.867.766.665.564.363.262.060.959.858.657.456.155.053.852.551.450.349.047.846.745.544.343.141.940.839.638.437.236.134.933.732.531.330.128.927.826.725.524.323.122.020.719.6

NA92.091.090.089.088.087.086.084.583.582.581.0

186517871710163315561478140013231245116010761004940900865832800772746720697674653633613595577560544528513498484471458446434423412402392382372363354345336327318310302294286279272266260254248243238

__________

972946920895870846822799776754732710690670650630612594576558542526510495480466452438426414402391380370360351342334326318311304297290284278272266261256251

NA739722706688670654634615595577560543525512496481469455443432421409400390381371362353344336327319311301294286279271264258253247243237231226

NA351338325313301292283273264255246238229221215208201194188182177171166161156152149146141138135131128125123119117115112110

__________

953949945942938934930926922917913909904900896891887883879874870865861856851847842837832827822817812807802798793788783778773768762757751746741736730725720

NOT

E1

NOT

E2

®

Note1: A 10 mm steel ball was used for 450 BHN and below. A 10 mm carbide ball was used above 450 BHN.

2: The tensile strength relation to hardness is inexact, even for steel, unless it is determined for a specific material.

H A R D N E S S C O N V E R S I O N C H A R T

10643 S. Norwalk Blvd., Santa Fe Springs, CA 90670 800.622.6624www.continentalht.com

“Providing reliable service and consistent workmanship to our customers since 1957”

H A R D N E S S C O N V E R S I O N C H A R T

SOFT STEEL,GREY AND MALLEABLE CAST IRONANDMOSTNON-FERROUSMETALS

The values shown are approximate only and this chart is intended primarily as a reference guide.

1009998979695949392919089888786858483828180797877767574737271706968676665646362616059585756555453525150494847464544434241403938373635343332313029282726252423222120191817161514131211109876543210

B F G 15-T 30-T 45-T HK HBHV KSI WMNA

Superficial

500 gmandover

3000 kg10 kg

60kg

1/16"ball

1000lbs/sq in

1000gm

Knoop 10 mmVickers 136°

TensileStrength

MicroficialRockwell

100kg

1/16"ball

61.560.960.259.558.958.357.657.056.455.855.254.654.053.452.852.351.751.150.650.049.548.948.447.947.346.846.345.845.344.844.343.843.342.842.341.841.440.940.440.039.539.038.638.137.737.236.836.335.935.535.034.634.133.733.332.932.432.031.631.230.730.329.929.529.128.728.227.827.427.026.626.025.525.024.524.324.023.523.022.522.021.521.321.020.520.0NA

82.581.079.077.576.074.072.571.069.067.566.064.062.561.059.057.556.054.052.551.049.047.546.044.042.541.039.037.536.034.532.531.029.528.026.525.023.522.020.519.017.516.014.513.011.510.08.57.05.54.02.5NA

93.192.892.592.191.891.591.290.890.590.289.989.589.288.988.688.287.987.687.386.986.686.386.085.685.385.084.784.384.083.783.483.082.782.482.181.881.481.180.880.580.179.879.579.278.878.578.277.977.577.276.976.676.275.975.675.374.974.674.374.073.673.373.072.772.372.071.771.471.070.770.470.069.369.569.068.868.568.067.867.567.367.066.566.366.065.565.365.064.564.364.063.863.563.062.862.562.061.861.561.060.5

72.971.970.969.968.967.966.965.964.863.862.861.860.859.858.857.856.855.854.853.852.851.850.849.848.847.846.845.844.843.842.841.840.839.838.737.736.735.734.733.732.731.730.729.728.727.726.725.724.723.722.721.720.719.718.717.716.715.714.713.612.611.610.69.68.67.66.65.64.63.62.61.0NA

NA99.699.198.598.097.496.896.295.695.194.593.993.492.892.291.791.190.590.089.488.888.287.787.186.586.085.484.884.383.783.182.682.081.480.880.379.779.178.678.077.476.976.375.775.274.674.073.573.072.572.071.070.570.069.569.068.568.067.066.566.065.565.064.564.063.563.062.061.561.060.560.059.559.058.057.557.0

116114109104102100989492908988868483828180777372706968676665646362616059585756

NA

730725719713707701696690684679674668662656651646640634629624618612607602596592587581576571566561556551546542537532527522517512507502497492487482477472468463458453448444439435430426422417413409404401396392388384380376372369365361357353350346343339335332329325322318314311308304300297293289286283279276272

NOT

E2

NA10099.599.098.097.597.096.095.595.094.593.593.092.592.091.090.590.089.589.088.087.587.086.585.585.084.584.083.582.582.081.581.080.079.579.078.578.077.076.576.075.575.074.073.573.072.572.071.070.570.069.568.568.067.567.066.565.565.064.564.063.562.562.061.561.060.560.059.058.558.057.557.0

E H K

NA10099.598.598.097.096.595.594.594.093.092.091.090.589.588.588.087.086.085.084.583.582.581.581.080.079.078.077.576.575.574.574.073.072.071.070.569.568.568.067.066.065.064.563.562.561.561.060.059.058.057.556.555.554.554.053.052.051.550.549.548.548.047.046.045.044.543.542.541.541.040.039.038.037.536.535.535.034.033.032.031.530.529.529.028.027.026.025.524.523.523.022.021.0

150kg

1/16"ball

60kg

Brale

100kg

1/8"ball

60kg

1/8"ball

150kg

1/8"ball

30 kg1/16"ball

15 kg1/16"ball

45 kg1/16"ball

NA10099.599.098.898.598.097.897.597.096.596.396.095.595.395.094.594.394.093.593.092.892.592.091.891.591.090.590.390.089.589.389.088.588.087.887.587.0

25124624123623122622121621120620119619218818418017617317016716416115815515215014714514314113913713513313112912712512412212011811711511411211111010910810710610510410310210110099989796959493929190898887878685848382828181807978787776757574737271717069696968686363

83.182.581.881.180.479.879.178.477.877.176.475.875.174.473.873.172.471.871.170.469.769.168.467.767.166.465.765.164.463.763.162.461.761.060.459.759.058.457.757.056.455.755.054.453.753.052.451.751.050.349.749.048.347.747.046.345.745.044.343.743.042.341.641.040.339.639.038.337.637.036.335.634.534.033.032.532.031.030.529.529.028.527.527.026.025.525.024.023.523.022.021.520.520.019.518.518.017.016.516.015.0

Brinell

HB

500 kg10 mm

ball

20119518918417917517116716316015715415114814514214013713513313012812612412212011811611411211010910710610410210199989695949291908987868584838281808079787776757574737272717069696867666665656464636262616160605959595858575757565655555554545453

240234228222216210205200195190185180176172169165162159156153150147144141139137135132130127125123121119117116114112110108107106104103101100NA

Brale Diamond IndenterDiameter of Specimen - inches (mm)

ObservedReading

908580

757065

605550

454035

302520

Scales C, D, A

1/8(3.2)

NA

1/4(6.4)

0.50.50.5

1.01.01.5

1.52.02.5

3.03.54.0

5.05.56.0

3/8(10)

00.50.5

0.51.01.0

1.01.52.0

2.02.53.0

3.54.04.5

1/2(13)

00.50.5

0.50.51.0

1.01.01.5

1.52.02.0

2.53.03.5

5/8(16)

00

0.5

0.50.50.5

0.51.01.0

1.01.51.5

2.02.52.5

3/4(19)

00

0.5

0.50.50.5

0.50.51.0

1.01.01.5

1.52.02.0

7/8(22)

000

0.50.50.5

0.50.50.5

1.01.01.0

1.51.51.5

1(25)

000

00.50.5

0.50.50.5

0.51.01.0

1.01.01.5

1-1/4(32)

000

000

00.50.5

0.50.50.5

1.01.01.0

1-1/2(38)

000

000

00

0.5

0.50.50.5

0.51.01.0

N Brale Diamond IndenterDiameter of Specimen - inches (mm)

ObservedReading

908580

757065

605550

454035

302520

Scales 15-N, 30-N, 45-N

1/8(3.2)

00.51.0

1.52.02.5

3.03.53.5

4.04.55.0

5.55.56.0

1/4(6.4)

00.50.5

1.01.01.5

1.52.02.0

2.02.52.5

3.03.03.0

3/8(10)

00.50.5

0.51.01.0

1.01.51.5

1.51.52.0

2.02.02.0

1/2(13)

00.50.5

0.50.50.5

1.01.01.0

1.01.51.5

1.51.51.5

5/8(16)

00

0.5

0.50.50.5

1.01.01.0

1.01.01.0

1.51.51.5

3/4(19)

000

0.50.50.5

0.50.51.0

1.01.01.0

1.01.51.5

7/8(22)

000

00.50.5

0.50.51.0

1.01.01.0

1.01.51.5

1(25)

000

00.50.5

0.50.50.5

1.01.01.0

1.01.01.5

1-1/4(32)

NA

1/16 in Ball IndenterDiameter of Specimen - inches (mm)

ObservedReading

1009080

706050

403020

100

Scales B, F, G

1/8(3.2)

NA

1/4(6.4)

3.54.05.0

6.07.08.0

9.010.011.0

12.012.5

3/8(10)

2.53.03.5

4.05.05.5

6.06.57.5

8.08.5

1/2(13)

1.52.02.5

3.03.54.0

4.55.05.5

6.06.5

5/8(16)

1.51.52.0

2.53.03.5

4.04.54.5

5.05.5

3/4(19)

1.01.51.5

2.02.53.0

3.03.54.0

4.04.5

7/8(22)

1.01.51.5

2.02.02.5

2.53.03.5

3.53.5

1(25)

0.51.01.5

1.52.02.0

2.52.53.0

3.03.0

1-1/4(32)

NA

1-1/2(38)

NA

1-1/2(38)

NA

1/16 in Ball IndenterDiameter of Specimen - inches (mm)

ObservedReading

908070

605040

3020

Scales 15-T, 30-T, 45-T

1/8(3.2)

1.53.05.0

6.58.5

1/4(6.4)

1.02.03.5

4.55.56.5

7.59.0

3/8(10)

1.01.52.5

3.04.04.5

5.06.0

1/2(13)

0.51.52.0

2.53.03.5

3.54.5

5/8(16)

0.51.01.5

2.02.53.0

3.54.5

3/4(19)

0.51.01.0

1.52.02.5

2.53.0

7/8(22)

0.51.01.0

1.52.02.0

2.02.0

1(25)

0.50.51.0

1.51.52.0

2.02.0

1-1/4(32)

NA

1-1/2(38)

NA

10.0

11.513.0

These corrections are approximate only and represent the averages to thenearest 1/2 Rockwell number.

CYLINDRICAL CORRECTION CHART 53Cylindrical work corrections to be added to observed

Rockwell number for scales indicated