Steel Hardness Conversion

Steel Hardness Conversion Below is a conversion table for the hardness of the steel.

The values listed are for reference only. There are some parameters that could change the conversion. For example, the HV is only testing on a focused small spot, where the HRC/HB would have a test result from a much bigger area.

Item Rockwell Rockwell Surface Surface Surface Vickers Brinell Brinell Rockwell Rockwell Rockwell

2 HRC HRA HR15N HR30N HR45N HV HB30D d10、2d5、4d2.5 mm

1 17 67.3 37.9 15.6 211 211 4.15 2 17.5 67.6 38.4 16.2 214 214 4.13 3 18 67.8 38.9 16.8 216 216 4.11 4 18.5 68 39.3 17.4 218 218 4.09 5 19 68.3 39.8 18 221 220 4.07 6 19.5 68.5 40.3 18.6 223 222 4.05 7 20 68.8 40.7 19.2 226 225 4.03 8 20.5 69 41.2 19.8 229 227 4.02 9 21 69.3 41.7 20.4 231 227 4 10 21.5 69.5 42.2 21 234 232 3.97 11 22 69.8 42.6 21.5 237 234 3.95 12 22.5 70 43.1 22.1 240 237 3.93 13 23 70.3 43.6 22.7 243 240 3.91 14 23.5 70.6 44 23.3 246 242 3.89 15 24 70.8 44.5 23.9 249 245 3.87 16 24.5 71.1 45 24.5 252 248 3.85 17 25 71.4 45.5 25.1 255 251 3.83 18 25.5 71.6 45.9 25.7 258 254 3.8 19 26 71.9 46.4 26.3 261 257 3.78 20 26.5 72.2 46.9 26.9 264 260 3.76 21 27 72.4 47.3 27.5 268 263 3.74 22 27.5 72.7 47.8 28.1 271 266 3.72 23 28 73 48.3 28.7 274 269 3.7 24 28.5 73.3 48.7 29.3 278 273 3.67 25 29 73.5 49.2 29.9 281 276 3.65 26 29.5 73.8 49.7 30.5 285 280 3.63 27 30 74.1 50.2 31.1 298 283 3.61 28 30.5 74.4 50.6 31.7 292 287 3.59 29 31 74.7 51.1 32.3 296 291 3.56 30 31.5 74.9 51.6 32.9 300 294 3.54 31 32 75.2 52 33.5 304 298 3.52 32 32.5 75.5 52.5 34.1 308 302 3.5 Hardness & Tensile Conversion Below is the reference conversion table for steel to convert the hardness to its tensile strength.

There are parameters that could change the real result of the tensile strength testing, for example: temper embrittlement, hydrogen embrittlement, percentage of carbon, amount of the impurity...

Item Rockwell Tensile Tensile Tensile Tensile Tensile Tensile Tensile Tensile Tensile Tensile

σbMPa σbMPa σbMPa σbMPa σbMPa σbMPa σbMPa σbMPa σbMPa σbMPa HRC Carbon Cr CrV CrNi CrMo CrNiMo CrMnSi High Stainless General Steel Steel Steel Steel Steel Steel Steel Strength Steel Steel 1 17 73.6 706 705 772 726 757 703 724 2 17.5 74.4 714 712 775 731 763 711 731 3 18 753 723 719 779 737 769 719 737 4 18.5 762 731 727 783 743 776 728 744 5 19 771 739 735 788 749 782 737 752 6 19.5 780 748 743 792 755 789 745 759 7 20 790 757 751 797 761 796 754 767 8 20.5 799 766 759 802 768 803 764 774 9 21 809 775 767 807 775 810 773 782 10 21.5 819 785 776 813 782 817 782 791 11 22 829 794 785 819 789 825 792 799 12 22.5 839 804 794 825 797 832 802 808 13 23 849 814 803 831 805 840 812 816 14 23.5 860 824 813 838 813 848 822 825 15 24 870 834 823 845 821 856 832 835 16 24.5 881 844 833 852 830 865 843 844 17 25 892 855 843 860 838 874 853 854 18 25.5 903 865 853 868 847 866 882 864 864 19 26 914 876 864 876 857 876 892 875 874 20 26.5 926 887 875 884 867 886 901 885 884 21 27 937 898 886 893 877 897 910 897 895 22 27.5 949 909 897 902 887 907 920 908 906 23 28 961 920 909 912 897 918 930 919 917 24 28.5 972 932 921 922 908 930 941 931 928 25 29 984 943 933 932 919 941 951 942 940 26 29.5 997 955 946 942 931 953 962 954 951 27 30 1009 967 959 953 943 966 973 966 964 28 30.5 1021 979 972 964 955 978 985 978 976 29 31 1034 991 985 976 967 991 996 990 989 30 31.5 1047 1004 999 988 980 1005 1008 1003 1001 31 32 1060 1016 1013 1001 993 1018 1020 1015 1015 Surface Roughness Conversion In Taiwan and China, usually we use metric "Ra" system for the surface roughness measurement.

In USA, you can simply divide the inch roughness number by 40 to get the metric Ra number. For example, if the inch drawing specifies surface roughness 32.

32 / 40 = Ra 0.8

Surface roughness can be specified in different way of measure. Below is a conversion table of them.

Ra Rmax(Ry) Rz Number Triangle 0.013a 0.05S 0.05Z N 1 0.025a 0.1S 0.1Z N 2 VVVV 0.05a 0.2S 0.2Z N 3 0.10a 0.4S 0.4Z N 4 0.20a 0.8S 0.8Z 0.40a 1.6S 1.6Z N 5 0.80a 3.2S 3.2Z N 6 VVV 1.6a 6.3S 6.3Z N 7 3.2a 12.5S 12.5Z N 8 6.3a 25S 25Z N 9 VV

12.5a 50S 50Z N10 25a 100S 100Z N11 V

Metal Standard Conversion Material Standard Conversion ASTM / DIN / JIS / BS / GB China / ISO / NF: Below is a conversion table of the most frequently used materials in different national standards, as to the composition of the materials, please refer to “Metal Material Composition”. - Materials in different national standards might be slightly different in some detail compositions. It would be better to specify which standard it is conforming to in the quotation and the purchase order. - Due to the size limit of this web page, some of the materials could not be listed here. For example, some sheet metal stamping materials CRS plates, Galvanized plates..If you would need more information, please contact SINAMA. - Same material but in different shape or form might have different material numbers or names. - The national standard of USA is ANSI, however ASTM is more frequently used

Note: ASTM (USA): American Society for Testing and Materials DIN (Germany): Deutsches Institut fur Normung / Deutsches Industrie Norm JIS (Japan) Japanese Industrial Standard BS (UK): British Standard GB China (China): Guo Biao Standard ISO (ISO): International Organization for Standardization NF (France): Normes Française (AFNOR/ Association française de Normalisation) Carbon Steel and Alloy Steel ASTM DIN JIS BS GB ISO NF 1008 1.0310 C10 S10C 045A10 08 C10 XC10 1010 1.1121 CK10 045M10 10 1015 1.0401 C15 S15C 15 XC18 1.1141 CK15 XC18S 1020 1.0402 C20 S20C 070M20 20 1.1151 CK20 1035 1.0501 C35 S35C 080A35 35 C35 XC38 1.1181 CK35 080M36 C35E4 XC38H1 XC38H2 1040 1.0511 C40 S40C 060A40 40 C40 XC42H1 1.1186 CK40 080A40 C40E4 XC42H2 080M40 1045 1.0503 C45 S45C 060A45 45 C45 XC45 1.1191 CK45 080A46 C45E4 1050 1.0540 C50 S50C 080M50 50 C50 XC50 1.1210 CK50 C50E4 12L14 1.0737 9SMnPb36 SUM24L Y12Pb 11SMnPb28 4135 1.7220 34CrMo4 SCM435 708A37 34CrMo4 34CD4 709A37 38CD4 4140 1.7225 42CrMo4 SCM440 708M40 42CrMoA 42CrMo4 42CD4 4142 1.7227 42CrMoS4 708A40 708A42 709M42 709M40 5120 20Cr4 SCr420 20Cr 20Cr4 20MC5 5135 1.7033 34Cr4 SCr435 530A36 35Cr 34Cr4 38MC4 1.7034 37Cr4 37Cr4 5140 1.7034 37Cr4 SCr440 530A40 40Cr 37Cr4 42MC4 1.7035 41Cr4 530M40 41Cr4 6150 1.8159 50CrV4 SUP10 735A51 50CrVA 9 50CV4 735H51 8620 1.7321 20NiCrMo2 SNACM220 805A20 20NiCrMo2 20NCD2 805M20 Stainless Steel ASTM DIN JIS BS GB ISO NF 304 1.4301 X5CrNi18-10 SUS304 304S31 0Cr18Ni9 11 Z7CN18.09 S30400 0Cr19Ni9 304L 1.4306 X2CrNi19-11 SUS304 304S11 0Cr19Ni10 10 Z3CN18.10 S30403 316 1.4401 X5CrNiMo17-12-2 SUS316 316S31 0Cr17Ni12Mo2 20 Z7CND17.11-02 S31600 420 1.4021 X20Cr13 SUS420 420S29 2Cr13 4 Z20C13 S42000 1.4028 X30Cr13 3Cr13 430 1.4016 X6Cr17 SUS430 430S17 1Cr17 8 Z8C17 S43000 440C 1.4125 X105CrMo17 SUS440C 9Cr18 Z100CD17 S44004 11Cr17 630 1.4542 X5CrNiCuNb17-4 SUS630 0Cr17Ni4Cu4Nb 1 Z6CNU17.04 S17400 (17-4) Aluminum Alloy ASTM DIN JIS BS GB ISO NF 2014 3.1255 AlCuSiMn A2014S 2014A LD10 Al-Cu4SiMg 2014A 2024 3.1335 AlCuMg2 A2024S LY9 Al-Cu4Mg1 2024

5052 3.3535 AlMg3 A5052S LF2 5052 6061 3.3206 AlMgSi0.5 A6061S 6061 LD2 Al-Mg1SiCu 6061 LD3 6063 A6063S 6063 Al-Mg0.7Si 7075 3.4365 AlZnMgCu1.5 A7075S LC4 AlZn5.5MgCu 7075 356 AC4C LM-25 ZL101 Al-Si7Mg(Fe) A-S7G A356 G(GK)-AlSi7Mg AC4CH Al-Si7Mg A360 3.2382.05 GD-AlSi10Mg ADC3 Y104 A-S9 (SG100A) (YZAlSi10Mg) 380 A380 GD-AlSi9Cu3 ADC10 LM 24 Al-Si8Cu3Fe A-S9U3 (SC84A) 383 ADC12 LM2 (SC102A) Zinc Alloy ASTM DIN JIS BS GB ISO NF Zamak 3 2.2140 GD-ZnAl4 ZDC2 ZZnAlD4 AG40A Zamak 5 2.2141 GD-ZnAl4Cu1 ZDC1 ZZnAlD4-1 AG41A Copper, Brass, and Bronze Alloy ASTM DIN JIS BS GB ISO NF C110 2.0090 E-Cu57 C1100 C101 T2 Cu-ETP C11000 C102 C260 2.0265 CuZn30 C2600 CZ106 H70 CuZn30 C26000 C268 2.0335 CuZn36 C2680 CZ107 H68 CuZn35 C26800 C360 2.0331 CuZn36Pb3 C3601 CZ124 HPb61-1 CuZn36Pb3 C36000 2.0401 CuZn39Pb3 C3602 CZ121 CuZn37Pb2 C3603 CuZn38Pb2 C3604 CuZn39Pb3 C377 2.0380 CuZn39Pb2 C3771 CZ122 HPb59-1 CuZn38Pb2 C37700 C521 2.1030 CuSn8 C5210 PB104 CuSn8 C52100 C836 2.1096.01 CuSn5ZnPb BC6 LG2 ZCuSn5Zn5Pb5 CuPb5Sn5Zn5 C83600 BC6C C865 2.0592 CuZn35Al1 HBsC1 HTP1 CuZn35AlFeMn C86500

Other referenced standards. (ANSI ) American National Standards Institute (AISI) American Iron and Steel Institute (AA) Aluminum Association (SAE) Society of Automotive Engineers (ASME) American Society of Mechanical Engineers

Metal Material Composition Material Composition of the Most Frequently Used Materials:

Below is a simplified list of the most frequently used materials of SINAMA. Material numbers listed hereafter are mainly based on the ASTM (USA) system. For conversion of these materials in other national standards, please refer to “Metal Standard Conversion”.

Note: S: Sheet Metal Stamping Materials B: Bar Stock Machining Materials F: Forging Materials C: Casting Materials

Carbon Steel and Alloy Steel

Number C Si Mn P S Ni Cr Mo Others Note:

1008 0.10 0.30-0.50 0.04 0.05 S. B, F,

1010 0.08-0.13 0.30-0.60 0.04 0.05 S. B, F,

1018 0.15-0.20 0.60-0.90 0.04 0.05 S. B, F,

1020 0.18-0.23 0.30-0.60 0.04 0.05 S. B, F,

1035 0.32-0.38 0.60-0.90 0.04 0.05 S. B, F,

1040 0.37-0.44 0.60-0.90 0.04 0.05 S. B, F,

1045 0.43-0.50 0.60-0.90 0.04 0.05 S. B, F,

1050 0.48-0.56 0.60-0.90 0.04 0.05 S. B, F,

12L14 0.15 0.85-1.15 0.04-0.09 0.26-0.35 Pb0.15-0.35 S. B

4135 0.33-0.38 0.15-0.35 0.70-0.90 0.035 0.040 0.80-1.10 0.15-0.25 S. B, F,

4140 0.38-0.43 0.15-0.35 0.75-1.00 0.035 0.040 0.80-1.10 0.15-0.25 S. B, F,

5120 0.17-0.22 0.15-0.35 0.70-0.90 0.035 0.040 0.70-0.90 S. B, F,

5135 0.33-0.38 0.15-0.35 0.60-0.80 0.035 0.040 0.80-1.05 S. B, F,

5140 0.38-0.43 0.15-0.35 0.70-0.90 0.035 0.040 0.70-0.90 S. B, F,

C 6150 0.48-0.53 0.15-0.35 0.70-0.90 0.035 0.040 0.80-1.10 V 0.15min S. B, F,

8620 0.18-0.23 0.15-0.35 0.70-0.90 0.035 0.040 0.40-0.70 0.40-0.60 0.15-0.25 S. B, F,

C Stainless Steel

Number C Si Mn P S Cr Ni Mo Others Note:

304 0.08 1.00 2.00 0.045 0.030 18-20 8-10.5 N 0.10 S. B, F,

304L 0.03 1.00 2.00 0.045 0.030 18-20 8-10.5 N 0.10 S. B, F,

316 0.08 1.00 2.00 0.045 0.030 16-18 10-14 2.0-3.0 N 0.10 S. B, F,

420 0.15 1.00 1.00 0.040 0.030 12-14 S. B, F,

430 0.12 1.00 1.00 0.040 0.030 16-18 S. B, F,

440 0. 6-1.2 1.00 1.00 0.040 0.030 16-18 0.75 S. B, F,

630 0.07 1.00 1.00 0.040 0.030 15-17.5 3-5 Cu 3-5 S. B, F,

(17-4) C Aluminum Alloy

Number Al Si Fe Cu Mn Mg Cr Zn Others Note:

2014 Rem 0.5-1.2 0.7 max 3.9-5.0 0.40-1.2 0.20-0.8 0.1max 0.25max Ti0.15max B, F

2024 Rem 0.5max 0.5max 3.8-4.9 0.3-0.9 1.2-1.8 0.1max 0.25max Ti0.15max B, F

5052 Rem 0.25max 0.4max 0.1max 0.1max 2.2-2.8 0.15-0.35 0.10max S

6061 Rem 0.4-0.8 0.7 max 0.15-0.40 0.15max 0.8-1.2 0.04-0.35 0.25max Ti0.15max S. B, F

6063 Rem 0.2-0.6 0.35 max 0.1max 0.1max 0.45-0.9 0.1max 0.1max Ti0.1max S. B, F

7075 Rem 0.4max 0.5max 1.2-2.0 0.3 max 2.1-2.9 0.18-2.8 5.1-6.1 Ti0.20max B, F

356 Rem 6.6-7.5 0.6 max 0.25max 0.35 max 0.20-0.45 0.35 max Ti0.25max C

A356 Rem 6.6-7.5 0.2 max 0.2max 0.1 max 0.25-0.45 0.1 max Ti0.20max C

A360 Rem 9-10 1.3 max 0.6max 0.35max 0.4-0.6 0.5 max Ni0.5max C

Sn0.15max

380 Rem 7.5-9.5 1.3 max 3-4 0.5max 0.1 max 3 max Ni0.5max C

Sn0.35max

A380 Rem 7.5-9.5 2 max 3-4 0.5max 0.1 max 3 max Ni0.5max C

Sn0.35max Zinc Alloy

Number Al Mg Zn Cd Cu Fe Pb Sn Others Note:

Zamak 4.1 0.04 96 AG40A C #3

Zamak 3.5-4.3 0.03-0.08 94.25-95.72 0.004max 0.75-1.25 0.1max 0.005max 0.003max AG41A C

#5 Copper, Brass, and Bronze Alloy

Number Cu Pb Fe Sn Zn Mn Ni P Others Note:

C110 99.9 S. B, F,

C260 68.5-71.5 0.07max 0.05max Rem S

C268 64-68.5 0.07max 0.05max Rem S

C360 60-63 2.5-3.7 0.35max Rem S, B

C377 58-61 1.5-2.5 0.3max Rem B, F

C521 Rem 0.05max 0.1max 7-9 0.2max 0.03-0.35 S

C836 84-86 4.0-5.7 0.25 4.6-6.0 4.3-6.0 0.8 Al0.005max C

C865 55-60 0.3 0.4-2 1 36-42 0.1-1.5 0.8 Al0.5-1.5 C - There are a lot more materials available, but due to the size limit of this web page, we could only make a list of the most frequently used ones. - Also due to the size limit of this web page, the mechanical properties and some detail requirements of the composition could not be included in this list. - Materials could have different names when the form/utility is changed. For example, SS304 could be specified as CF-8 when used for casting processes. - Any further information, please contact SINAMA, we will have our metallurgist to answer your questions.

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