2.20 (782)** 68 - 940 368,000
2.25 (744)** 67 - 900 360,000
2.30 (713)** 65 - 832 354,000
2.35 (683)** 63 - 772 341,000
2.40 (652)** 62

-

746 329,000
2.45 (627)** 60

-

697 317,000
2.50 600 58

-

653 305,000
2.55 578 56 - 613 295,000
2.60 555 55 120 595 284,000
2.65 532 53 119 560 273,000
2.70 512 52 119 544 263,000
2.75 495 50 117 513 253,000
2.80 477 48 116 484 242,000
2.85 460 47 116 471 233,000
2.90 444 46 115 458 221,000
2.95 430 44 114 434 211,000
3.00 418 43 114 423 202,000
3.05 402 42 113 412 193,000
3.10 387 41 112 402 185,000
3.15 375 39 112 382 178,000
3.20 364 38 110 372 171,000
3.25 351 37 110 363 165,000
3.30 340 36 109 354 159,000
3.35 332 35 108 345 154,000
3.40 321 34 108 336 148,000
3.45 311 32 107 318 143,000
3.50 302 31 106 310 139,000
3.55 293 30 105 302 135,000
3.60 286 29 104 294 131,000
3.65 277 28 104 286 127,000
3.70 269 27 104 279 124,000
3.75 262 26 103 272 121,000
3.80 255 25 102 266 117,000
3.85 248 24 102 260 115,000
3.90 241 23 100 254 112,000
3.95 235 22** 99 248 109,000
4.00 228 21 98 243 107,000
4.05 223 20 97 238 105,000
4.10 217 (18)*** 96 217 103,000
4.15 212 (17)*** 96 212 100,000
4.20 207 (16)*** 95 207 98,000
4.25 202 (15)*** 94 202 96,000
4.30 196 (14)*** 93 196 95,000
4.35 192 (12)*** 92 192 93,000
4.40 187 (12)*** 91 187 91,000
4.45 183 (11)*** 90 183 89,000
4.50 179 (10)*** 89 179 87,000
4.55 174 - 88 174 85,000
4.60 170 - 87 170 84,000
4.65 166 - 86 166 82,000
4.70 163 - 85 163 81,000
4.75 159 - 84 159 79,000
4.80 156 - 83 156 78,000
4.85 153 - 82 153 76,000
4.90 149 - 81 149 75,000
4.95 146 - 80 146 74,000
5.00 143

-

79 143 72,000
5.05 140 - 78 140 71,000
5.10 137 - 77 137 70,000
5.15 134 - 76 134 68,000
5.20 131

-

74 131 66,000
5.25 128 - 73 128 65,000
5.30 126 - 72 126 64,000
5.35 124 - 71 124 63,000
5.40 121

-

70 121 62,000
5.45 118

-

69 118 61,000
5.50 116 - 68 116 60,000
5.55 114 - 67 114 59,000
5.60 112 - 66 112 58,000
5.65 109 - 65 109 56,000
5.70 107 - 64 107 55,000
5.75 105 - 62 105 54,000
5.80 103 - 61 103 53,000
5.85 101 - 60 101 52,000
5.90 99 - 59 99 51,000
5.95 97 - 57 97 50,000

1

Brinell impression diameters and hardness numbers derived from ASTM E 10; conversion to Rockwell and Vickers hardness numbers derived from ASTM E 140; approximate tensile strength derived from test records and various published tables.

* 

 Hardness measurement tests only give a means to estimate tensile strength, not a means to estimate yield strength; Yield strength estimation requires, in addition to the hardness measurement, a knowledge of the chemistry and thermal history of the material tested.
  

** 

 22 RC, 99 RB, 237 HBW (read 235 in table), and 248 HV represent the important upper hardness limit for non-austenitic steel for H2S service specified in NACE MRO175 and referenced in API Spec 6A. Some authorities may offer slightly different equivalent hardness numbers.
  

*** 

 Parenthesis around a hardness number indicates the testing method has questionable accuracy in this range.
Click here to learn more about Brinell Hardness and it's relation to API specified products.

Click here for hardness related definitions.

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