1. Brinell hardness tester and the Rockwell B scale hardness ruler can be used to measure the low-carbon Chromium steel.

2. The Carbon chrome in the situation of Annealing and tempering can be tested by Brinell hardness tester, or rockwell hardness plan B, C ruler

3. The Rockwell tester C rod can measure the Chromium steel in quenching.

4. The high carbon chrome steel may use the Rockwell tester C rod to survey.

5. The Chromium steel under superficial cementation and Permeability nitrogen should use the superficial Rockwell tester or Vickers hardness tester.

6. Regarding big-ticket item, it can also use the Shore hardness tester and Simple hammering brinell hardness tester to have a test.

7. Regarding the request of non-destructive inspection, may use the ultrasonic wave examination and the magnetic saturation examination.

8. For the special mass work piece, may use the specially made mechanism to exam.

9. For instance, rolling bearing steel ball valve falls from a certain height on the high degree of hardness steel plate. because the steel plate has certain angle, therefore degree of hardness high jumps far, degree of hardness low jumps near, degree of hardness moderate jumps distance in among. Then collect with respective collecting device, namely realizes the survey and sort of hardness.

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