The Rockwell C scale is used to measure the hardness of metals. It is a universal way of measuring hardness that can be used for almost any metal, alloy, or non-metallic substance. The Brinell hardness test measures the ability of a material to withstand an indentation from a standardized loading ball by measuring how deeply the ball penetrates the surface of the material. Although these two methods are almost similar in theory, there are some important differences between these two widely used methods when testing metal hardness. This article explores the conversion of Rockwell C to Brinell Hardness in more detail. Keep reading to learn more.
I. What is Rockwell C Hardness?
The Rockwell C hardness test is an industry-standard used to test the hardness of a material by measuring its resistance to indentation. The hardness of a material is commonly expressed using the Rockwell C scale (RC), which includes a series of 10 different hardnesses.
II. What is Brinell Hardness?
The Brinell hardness test measures the resistance of a metal to indentation by using a hardened steel ball with a specified diameter. The material being tested is pressed into the ball’s surface with a known force until the depth it penetrates can be measured. The Brinell hardness test uses the results from this measurement for comparison purposes with other substances or materials that are tested using similar equipment and methods.
III. How do you Convert Rockwell Hardness to Brinell Hardness?
The conversion of the Rockwell C scale to Brinell hardness is a straightforward process and requires only a few basic measurements. You must measure the hardness of the material using the RC scale, then translate its value onto the Brinell scale. The resulting number serves as your new Brinell hardness measurement. There are ASTM standard conversion charts and tables designed to help with the conversion.
IV. Which is Harder Rockwell C or B?
Rockwell C is harder than Rockwell B. Rockwell C is used to test harder materials such as steel. On the other hand, Rockwell B is used to measure softer materials such as brass. Most metals are tested multiple times for Rockwell hardness, and the average hardness value and the standard deviation are reported.
Related Article: Hardness Conversion: How to Convert To Rockwell B Scale?
Related Article: Importance of Hardness Conversion: Rockwell Hardness C Scale
V. Rockwell C to Brinell Hardness Conversion Chart
Rockwell C(150 kg) | Brinell (10 mm Steel Ball/ 500 kg) | Brinell (10 mm Steel Ball/ 3000 kg) |
65 | — | 739 |
64 | — | 722 |
63 | — | 705 |
62 | — | 688 |
61 | — | 670 |
60 | — | 654 |
59 | — | 634 |
58 | — | 615 |
57 | — | 595 |
56 | — | 577 |
55 | — | 560 |
54 | — | 543 |
53 | — | 525 |
52 | — | 500 |
51 | — | 487 |
50 | — | 475 |
49 | — | 464 |
48 | — | 451 |
47 | — | 442 |
46 | — | 432 |
45 | — | 421 |
44 | — | 409 |
43 | — | 400 |
42 | — | 390 |
41 | — | 381 |
40 | — | 371 |
39 | — | 362 |
38 | — | 353 |
37 | — | 344 |
36 | — | 336 |
35 | — | 327 |
34 | — | 319 |
33 | — | 311 |
32 | — | 301 |
31 | — | 294 |
30 | — | 286 |
29 | — | 279 |
28 | — | 271 |
27 | — | 264 |
26 | — | 258 |
25 | — | 253 |
24 | — | 247 |
23 | 201 | 240 |
22 | 195 | 234 |
21 | 189 | 228 |
20 | 184 | 222 |
18 | 179 | 216 |
16 | 175 | 210 |
15 | 171 | 205 |
13 | 167 | 200 |
12 | 163 | 195 |
10 | 160 | 190 |
9 | 157 | 185 |
8 | 154 | 180 |
7 | 151 | 176 |
6 | 148 | 172 |
5 | 145 | 169 |
4 | 142 | 165 |
3 | 140 | 162 |
2 | 137 | 159 |
1 | 135 | 156 |
0 | 133 | 153 |
Conclusion
Although converting Rockwell C to Brinell hardness can be difficult, these charts may help you with the task. The information on this page is provided for educational purposes and is not intended as a substitute for professional testing services.
The figures from the ASTM standard cover the vast majority of substances and applications. However, there are some exceptions. The conversion tables below provide a quick reference for some materials that may require special consideration, such as glass and ceramics.
Related Article: Hardness Test Comparison: Rockwell vs Brinell
Related Article: What are the Advantages and Disadvantages of the Brinell Method