• Second moment of area moment of inertiaSecond area moment calculation and radius of gyration of common shapes about weak and strong axes
  • Cubic orientation of primary and shear stresses and principal stress cosine rotationCombine primary and shear stresses into equivalent and principal stresses & their cosines
  • Nucleus and electron shells of atomic elementFind, sort and reorganise the properties of nature's atomic elements with active periodic table
  • Formulas included in Engineering PrinciplesCalculate unknowns in principle engineering formulas: stress, moments, power, energy, capstans, fluids, etc.
  • Properties of a triangle with inscribed and circumscribed circlesCalculate the properties of triangles and triangular configurations including inscribed and circumscribed circles
Area Moment calculation1 Combined Stress calculation2 Elements database3 Engineering Principles calculation4 Trigonometry calculation5
access to the technical calculator
Technical Help 2ᴺᴰ Moment of Area 2ᴺᴰ Moment of Area+ Added Mass & Drag Areas & Volumes Balancing (rotary) Beam Strength Beam Strength+ Bearings (low friction) Bearings (plain) Bending Moments BiMetallic Strip Buoyancy Carbon Steel Catenary Catenary+ Cathodic Protection Centrifugal Force Colebrook & Fanning Column Buckling Combined Stress Co-ordinates Copper Alloys Electrical Current Elliptical Curves Engineering Basics Explosions Fans Fatigue Flange Gaskets Flanges Floors Fluid Forces Fluid Numbers Friction Galvanic Corrosion Gears Hardness Conversion HPHT Flexible Pipe Lift Rigging Logs & Trig Machining Tolerances Metal Properties Mode Shapes Ocean Waves Optical Lenses Padeyes Partial Pressures Piling Pipe Flow Pipe Flow+ Pipe Strength Plastic Stress in Beams Plate Deflection Pressure Vessels Reel Capacity Resolution of Forces Screw Thread Machining Screw Threads Shafts Shock Loads Spring Strength Spring Coefficients Steel Beam Sizes Stress Concentration Table of the Elements Thermal Conductivity Trigonometry UniQon Upheaval Buckling Velocity & Acceleration Vessel Motions Vessel RAOs Vibration Damping Vortex Shedding Walls, Barriers & Tanks Weight Lifting Welding Wire Rope

Metal (and material) Hardness Calculator

The hardness of most materials, especially metals, can be measured accurately and with reasonable consistency. Moreover, the various testing methods devised over the years can be used to measure the hardness of the same materials but provide different values, dependent upon the technique used. Whilst each technique is usually best suited to particular materials or hardness ranges, they can be (and frequently are) used for comparison purposes. It is for this reason that a comparison between the various scales is perfectly valid.

Our hardness conversion page describes the most commonly used scales along with a description of each test method and a series of formulas that accurately convert between them within a specified range of values. CalQlata has now incorporated these formulas into a calculator that will simultaneously convert your entered scale/value into all the other scales.

Each hardness scale has a validity range (defined by CalQlata) outside which the conversion reliability may (but not necessarily) be suspect. Whilst the hardness calculator provides these ranges and warns you of any entered values that fall outside the range concerned (Fig 1), it will convert any value entered if the calculation is possible.

Hardness Scales

Below is listed the intended application for each scale included in the hardness calculator, albeit there is usually a good deal of overlap between each method regarding fitness for purpose.

Rockwell A:
Very hard materials such as tungsten-carbide, ceramics, hardened carbon and alloy steels

Rockwell B:
Relatively soft metals such as low and medium carbon steels in annealed condition

Rockwell C:
Medium hard metals such as medium carbon steels in normalised or work-hardened condition (metals that fall between Rockwell B and Rockwell A)

Rockwell D:
Metals that are slightly harder than those suited to Rockwell C, such as Case-hardened and low-hardened alloy steels

Rockwell 15-15N:
Used for relatively hard metals, such as those normally suited to Rockwell C, but that must leave only a shallow impression

Rockwell 30-30N:
Used for hard metals, such as those normally suited to Rockwell D, but that must leave only a shallow impression

Rockwell 45-45N:
Used for very hard metals, such as those normally suited to Rockwell A, but that must leave only a shallow impression

Brinell-std:
Used for metals of similar hardness to those suited to Rockwell C above (medium hardness)

Brinell-Hultgren:
Used for metals of similar hardness to those suited to Rockwell D above (hard)

Brinell-tungsten:
Used for metals of similar hardness to those suited to Rockwell A above (high hardness)

Vickers:
Used where high levels of accuracy are required and laboratory conditions are available

Shore:
Used for site measurement where comparison is of greater importance than accuracy

Hardness Calculator – Technical Help

Hardness calculator warning and error messages

Fig 1. Warning & Error Messages

There is only one calculation option; 'Hardness'

You select the input hardness scale from the drop-down menu under the Input Data:

You enter the hardness value in the adjacent text box

The hardness calculator automatically and instantly lists all the conversions in the data listing window.

If a warning is issued; red text on a white background (Fig 1), this means that the scale listed is outside the recommended range, which is provided in the warning.

If an error is issued; white text on a red background (Fig 1), this means that the scale listed cannot be converted into one or more of the other scales.

Accuracy

This calculator’s accuracy can be seen in the various plots provided in our hardness conversion page

Further Reading

You will find further reading on this subject in reference publications(2 & 3)

      Go to the calculator
CalQlata™ Copyright ©2011-2017 CalQlata info@calqlata.com Site Map Terms of website use Our Store