Chicago Flame Hardening - Surface Hardening, Stress Relieving, Mechanical Straightening

The degree of hardness depends on the chemical analysis of the metal, with carbon being the principal controlling element.

In choosing a material, availability, cost, hardness, and machinability are factors to consider. Our technical staff can advise you and discuss specific applications.

Maximum Attainable Hardness

Hardness Conversions

Steel/Iron Type	Hardness, Rockwell C
1020 mild steel	30-35
1035	45-50
1040	50-55
1045	55-60
1060	60-65
1145	55-60
1545 (speed treat)	55-60
4140	58-62
4150 (maxel -- 3.5)	60-65
4340	55-60
52100	60-65
8620	40-45
Meehanite GA	55-60
Ductile 80-60-03	55-65
Gray Iron	35-60
A36	40-45

Download a printable version of these hardness conversion charts to keep as a reference

Brinell	Rockwell C	Shore
682 653 627 601 578 555 534 514 495 477 461 444 429 415 401 388 375 363 352 341 331 321 311 302 293 285 277 269 262 255 248 241 235 229 223 217 212 207 197 187 179 170 163 156 149	62 60 59 58 56 55 54 52 51 50 48 47 46 44 43 42 40 39 38 37 36 34 33 32 31 30 29 28 27 25 24 23 22 20 19 18 16 15 13 10 8 5 3 1 --	84 81 79 77 75 73 71 70 68 66 65 63 61 59 58 56 54 52 51 50 48 47 46 45 43 42 41 40 39 38 37 36 35 34 -- 33 -- 32 30 29 27 -- -- -- --

Contact Info
Chicago Flame Hardening
5200 Railroad Ave.
East Chicago, IN 46312

Phone: 219-397-6475
773-768-2303
Fax: 219-397-4029

Email: sales@cflame.com