Page 251 - Mechanical Engineer's Data Handbook

ENGINEERING MATERIALS 239

Chemical symbols for metals and alloying elements

Aluminium AI Gold Au Selenium Se
Antimony Sb Mercury Hg Silicon Si
Arsenic As Indium In Sulphur S
Barium Ba Magnesium Mg Tantalum Ta
Beryllium Be Manganese Mn Tellurium Te
Bismuth Bi Molybdenum Mo Tin Sn
Carbon C Nickel Ni Titanium Ti
Cadmium Cd Phosphorus P Tungsten W
Cobalt co Lead Pb Uranium U
Chromium Cr Platinum Pt Vanadium V
Copper cu Plutonium Pu Zinc Zn
Iron Fe Radium Ra Zirconium Zr
Gallium Ga Rhodium Rh
Germanium Ge Silver Ag

Typical Brinell hardness numbers (BHN) for metals

Material BHN

Soft brass 60
Mild steel 130
Annealed chisel steel 235
White cast iron 415
Nitrided surface 750

Comparison of hardness numbers
Brinell Brinell Brinell
Rockwell Vicker’s hardness Rockwell Vicker’s hardness Rockwell Vicker’s hardness
C scale pyramid number C scale pyramid number C scale pyramid number

68 1030 - 49 515 468 30 299 286
67 975 - 48 500 458 29 29 1 279
66 935 - 47 485 447 28 284 272
65 895 - 46 470 436 27 277 266
64 860 - 45 456 426 26 271 260
63 830 - 44 442 416 25 265 255
62 800 - 43 430 406 24 260 250
61 770 - 42 418 396 23 255 245
60 740 - 41 406 386 22 250 240
59 715 609 40 395 376 21 245 235
58 690 594 39 385 366 20 240 230
57 670 579 38 375 356 - 220 210
56 650 564 37 365 346 - 200 190
55 630 549 36 355 337 - 180 171
54 610 5 34 35 345 328 - 160 152
53 590 519 34 335 319 - 140 133
52 570 504 33 325 310 __ 120 114
51 550 492 32 315 302 __ 100 95
50 532 480 31 307 294 - - -