1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards HARDNESS COMPARATIVE TABLES FOR STEEL & CAST STEEL EDS-T-7165 ISSUED DATE: 1995. 08. 08 REVISED DATE: 2006. 06. 19 VERSION: 3 EDS-T-7165HARDNESS COMPARATIVE TABLES FOR STEEL & CAST STEEL PAGE: 1/6 ISSUED DATE: 1995. 0
2、8. 08 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 1. PURPOSE Hardness comparative tables in this standard help reevaluate hardness values determined by various measuring methods and specify hardness-tensile strength values. 2. SCOPE These comparative tables apply limitedly to h
3、ot rolled or heat treated non-metallic alloy, low alloy steel and cast steel. In case of high alloy steel and cold formed steel, deviations between measured and converted values shall be calculated. In this case, it is not important to use the conversion table. Because reevaluating different hardnes
4、s value or hardness values from tensile strength values can cause errors, which shall be duly considered. Comprehensive test shows it is impossible to formulate hardness values, which are very carefully measured in different methods, to convert them, which applies to all metallic materials or all ki
5、nds of steel. It comes to the conclusion that the Penetration Behavior of materials is ruled by the very complicated method of the Stress-Deformation-Behavior. The more similar the Stress-Deformation-Behavior of measured materials is to that of diagrammatized materials, the more suitable the given c
6、onversion formula is. 3. PROCEDURE 3.1. The technical delivery conditions and basic characteristic values specified in drawings shall be determined along with necessary test conditions for this method. 3.2. When specific test methods can be used: adequate test apparatus is not provided or required t
7、est samples can not be obtained from test parts, conversion of hardness values or conversion of hardness values to tensile strength values shall be performed. 3.3. The characteristic values acquired directly from this test specification can be made for a basis of the comparison except the above-ment
8、ioned deviations. 3.4. All hardness determinations applies only to the range of indentation. As hardness change, that is, the distance grows on the surface, the mere difference in the indentation range will cause the values from the methods of Brinell and Vickers harness test to be nonidentical to t
9、he converted values. 3.5. Individual hardness value shall not be used for conversion. When converting hardness values, at least three hardness values shall be averaged. 3.6. If hardness values are reevaluated according to the table, the values shall be specified in a report and other documents. 3.7.
10、 The tensile strength values, which are determined from the Table 1, using the method of Brinell hardness test, shall be specified in a report or other documents as follows : “Converted by the method of Brinell hardness test according to EDS-T-7165“ EDS-T-7165HARDNESS COMPARATIVE TABLES FOR STEEL &
11、CAST STEEL PAGE: 2/6 ISSUED DATE: 1995. 08. 08 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 3.8. In determining characteristic values compared from the table, the following test specifications can apply. EDS-T-7118 Method of hardness test (Brinell) EDS-T-7120 Method of hardness
12、test (Vickers) EDS-T-7117 Method of hardness test (Rockwell Scale A, B & C, Super Rockwell N(T) EDS-T-7113 Method of tensile test 4. DISPERSION IN HARDNESS CONVERSION In estimating the reliability of the converted hardness values, the correctness of a used method of hardness test and the scale of re
13、evaluation shall be taken into account. the curve “a“ indicates average revaluation formula for steel which has a similar Stress-Deformation-Behavior in the measurement according to this test specification. Curve “b1“ and “b2“, which define both ranges of the curve “a“, is acquired by considering st
14、eel which has a different Stress-Deformation-Behavior. Ideal conversion of hardness H2/1shall comply with curve 1-2-3 and by doing this, the correct converted value H will be acquired. By considering the spread “from b1 to b2“, H and H1/5between all hardness values can be acquired. In addition, it s
15、hall also be taken into account that H2/1can be affected by the uncertainty of the related measurement method. For this reason the hardness can be changed from H2/1+to H2/1+, bringing converted value between H+and H1/5+. 5. RELATION OF HARDNESS TO TENSILE STRENGTH When the reevaluation of hardness v
16、alue can be accompanied by a large dispersion and systematic deviation, a larger dispersion can be acquired by converting hardness into tensile strength, which is because Stress-Deformation-Behavior of many steel does not correspond to that of the steel which made the conversion formula. EDS-T-7165H
17、ARDNESS COMPARATIVE TABLES FOR STEEL & CAST STEEL PAGE: 3/6 ISSUED DATE: 1995. 08. 08 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology It shall be taken into account that as well as having a different stress-Deformation-Behavior, hardness measurement, unlike tensile test, cause not
18、any failure and detachment of material. Because the two test methods have different stress and deformation speed, uniform material behavior cannot be expected. Conversion figures in the Table 1 can not be used as real measured values form the tensile test and but as approximate values. 6. COMPARATIV
19、E TABLE 6.1. Table 1 6.1.1. Note - Brinell harness values are selected according to EDS-T-7118. The values can be used for the test which applies 29,420 N (3,000 kp) using carbide metal ball or hardened steel ball with a diameter of 10 mm. The values which are measured up to 450 HB by carbide metal
20、ball or hardened steel ball are the same as actual ones (SAE J 417b). 6.1.2. Brinell, Vickers, Rockwell(A, B, C) and restitution hardness values are excerpted from SAE Handbook according to SAE J 417b, Table 2. Brinell hardness values smaller than mHB and ones in the range of HRC 62.5 is excerpted f
21、rom Georg Recherter, E lingen 4th edition 50 363. 6.1.3. Conversion of Brinell hardness value into tensile strength shall be made with a factor of 0.35 as follows. Rm = 0.35 HB(kp/mm2) N/mm2is expressed in unit of 10 N/mm2by multiplying Kp/mm2by factor 9.81. 6.2. Table 2 and 3. Super Rockwell hardne
22、ss value is excerpted from Reicherter, E lingen 4th edition. +) Brinell hardness value for Carbide metal ball EDS-T-7165HARDNESS COMPARATIVE TABLES FOR STEEL & CAST STEEL PAGE: 4/6 ISSUED DATE: 1995. 08. 08 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology Table 1. Initial comparativ
23、e table Brinell hardness Tensile strength Vickers hardnessRockwell hardness Seleroscope hardnessRm d (mm) HB (kp/mm2) (N/mm2)HV HRA HRB HRC 62.5 HRC Shore 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 682 653 627 601 578 555 5
24、34 514 495 477 461 444 429 415 401 388 375 363 352 341 331 321 311 302 239 229 219 210 202 194 187 180 173 167 161 155 150 145 140 136 131 127 123 119 116 112 109 106 2340 2250 2150 2060 1980 1900 1830 1770 1700 1640 1580 1520 1470 1420 1370 1330 1280 1250 1210 1170 1140 1100 1070 1040 940 920 900 8
25、80 860 840 820 800 780 760 740 737 720 700 697 690 680 670 667 640 615 591 569 547 528 508 491 472 455 440 425 410 396 383 372 360 350 339 328 319 85.6 85.3 85.0 84.7 84.4 84.1 83.8 83.4 83.0 82.6 82.2 82.2 81.8 81.3 81.2 81.1 80.8 80.6 80.5 79.8 79.1 78.4 77.8 76.9 76.3 75.6 74.9 74.2 73.4 72.8 72.
26、0 71.4 70.6 70.0 69.3 68.7 68.1 67.5 66.9 66.3 84.5 84.3 84.0 83.7 83.5 83.2 82.9 82.5 82.2 81.8 81.4 81.4 81.0 80.6 80.5 80.4 80.1 79.9 79.9 79.2 78.5 77.9 77.3 76.6 76.0 75.3 74.8 74.1 73.4 72.5 71.6 70.9 70.2 69.6 69.0 68.3 67.8 67.2 66.6 66.1 68.0 67.5 67.0 66.4 65.9 65.3 64.7 64.0 63.3 62.5 61.
27、8 61.7 61.0 60.1 60.0 59.7 59.2 58.8 58.7 57.3 56.0 54.7 53.5 52.1 51.0 49.6 48.5 47.1 45.7 44.5 43.1 41.8 40.4 39.1 37.9 36.6 35.5 34.3 33.1 32.1 97 96 95 93 92 91 90 88 87 86 84 83 81 80 79 77 75 73 71 70 68 66 65 63 61 59 58 56 54 52 51 50 48 47 46 45 EDS-T-7165HARDNESS COMPARATIVE TABLES FOR STE
28、EL & CAST STEEL PAGE: 5/6 ISSUED DATE: 1995. 08. 08 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology Table 2. Rockwell C and N comparative Table 3. Rockwell B and T comparative Rockwell C Rockwell N Rockwell B Rockwell T HRC HR15N HR30N HR45N HRC HR15N HR30N HR45N68 66 64 62 60 58 5
29、6 54 52 50 48 46 44 42 40 38 36 34 32 30 28 26 24 22 20 93.3 92.6 91.8 91.0 90.1 89.2 88.4 87.4 86.5 85.5 84.5 83.5 83.5 81.5 80.5 79.5 78.4 77.2 76.0 75.0 73.9 72.8 71.6 70.6 69.5 84.4 82.8 81.1 79.3 77.5 75.7 73.9 72.1 70.3 68.5 66.7 64.9 63.1 61.3 59.5 57.7 55.9 54.1 52.3 50.5 48.7 46.8 45.0 43.2
30、 41.5 75.5 73.3 71.1 68.8 66.5 64.2 62.0 59.7 57.3 55.0 52.6 50.2 47.8 45.5 43.1 40.7 38.3 36.0 33.6 31.3 28.9 26.6 24.2 21.8 19.5 100 98 96 94 92 90 88 86 84 82 80 78 76 74 72 70 68 66 64 62 60 58 56 54 52 50 48 46 44 42 40 38 36 35 92.7 92.1 91.5 90.9 90.2 89.5 88.8 88.1 87.4 86.8 86.1 85.5 84.8 8
31、4.1 83.4 82.7 82.0 81.4 80.7 80.0 79.4 78.7 78.0 77.3 76.6 76.0 75.3 74.6 74.0 73.3 72.6 72.0 71.3 71.0 71.0 69.2 67.4 65.4 63.5 61.6 59.7 57.9 56.1 54.2 52.4 50.5 48.7 46.7 44.9 43.0 41.0 39.0 37.0 34.9 32.8 30.7 28.6 26.5 24.4 22.3 20.1 18.0 15.8 13.6 11.5 9.5 7.3 6.2 EDS-T-7165HARDNESS COMPARATIV
32、E TABLES FOR STEEL & CAST STEEL PAGE: 6/6 ISSUED DATE: 1995. 08. 08 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology Brinell hardness Tensile strength Vickers hardnessRockwell hardness Seleroscope hardnessRm d (mm) HB (kp/mm2) (N/mm2)HV HRA HRB HRC 62.5 HRC 3.55 3.60 3.65 3.70 3.75
33、3.80 3.85 3.90 3.95 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 4.40 4.45 4.50 4.55 4.60 4.65 4.70 4.80 4.90 5.00 5.10 5.20 5.30 5.40 5.50 5.60 5.70 5.80 5.90 6.00 6.10 6.20 6.30 6.40 6.50 6.60 6.70 6.80 6.90 7.00 293 285 277 269 262 255 248 241 235 229 223 217 212 207 201 197 192 187 183 179 174 170 16
34、7 163 156 149 143 137 131 126 121 116 111 107 103 99.2 95.5 92.0 88.7 85.5 82.5 79.6 76.8 74.1 71.6 69.2 66.8 103 100 97 94 92 89 87 84 82 80 78 76 74 72 70 69 67 65 64 63 61 60 58 57 55 52 50 48 46 44 42 41 39 37 36 35 33 32 31 30 29 28 27 26 25 24 23 1010 980 950 920 900 870 850 820 800 780 760 75
35、0 730 710 690 680 660 640 630 620 600 590 570 560 540 510 490 470 450 430 410 400 380 360 350 340 320 310 300 290 280 270 260 250 250 240 230 309 301 292 284 276 269 261 253 247 241 234 228 222 218 212 207 202 196 192 188 182 178 175 171 163 156 150 143 137 132 127 122 117 112 108 104.2100.597.0 93.
36、4 89.5 86.5 65.7 65.3 64.6 64.1 63.6 63.0 62.5 61.8 61.4 60.8 100.099.0 98.2 97.3 96.4 95.5 94.6 93.8 92.8 91.9 90.7 90.0 89.0 87.8 86.8 86.0 85.0 82.9 80.8 78.7 76.4 74.0 72.0 69.8 67.6 65.7 63.3 61.0 58.8 56.5 53.7 50.7 47.3 65.0 64.5 63.9 63.3 62.8 62.2 61.6 60.8 59.9 59.3 30.9 29.9 28.8 27.6 26.6 25.4 24.2 22.8 21.7 20.5 43 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 23 22 21 20 19 18 15
