Gerdau MACSTEEL - United States of America, Engineered Carbon and Alloy Steel Bars

Hardness Conversion Tables

Based on Brinell (Approximate)

BRINELL HARDNESS ROCKWELL HARDNESS Diamond
Pyramid
Hardness
Number
(Vickers) Approx.
Tensile
Strength
1000 psi

Diameter
mm
3000 Kg Tungsten
Carbide
10 mm Ball A-Scale
60 Kg
Brale B-Scale
100 Kg
1/16" Ball C-Scale
150 Kg
Brale Superficial
30N

— — 86.5 — 70.0 86.0 1076 —

— — 86.0 — 69.0 85.0 1004 —

— — 85.6 — 68.0 84.4 940 —

— — 85.0 — 67.0 83.6 900 —

— 757 84.4 — 65.9 82.7 860 —

2.25 745 84.1 — 65.3 82.2 840 —

— 722 83.4 — 64.0 81.1 800 —

— 710 83.0 — 63.3 80.4 780 —

2.35 682 83.2 — 61.7 79.0 737 —

2.40 653 81.2 — 60.0 77.5 697 —

2.45 627 80.5 — 58.7 76.3 667 323

2.50 601 79.8 — 57.3 75.1 640 309

2.55 578 79.1 — 56.0 73.9 615 297

2.60 555 78.4 — 54.7 72.7 591 285

2.65 534 77.8 — 53.5 71.6 569 274

2.70 514 76.9 — 52.1 70.3 547 263

2.75 495 76.3 — 51.0 69.4 528 253

2.80 477 75.6 — 49.6 68.2 508 243

2.85 461 74.9 — 48.5 67.2 491 235

2.90 444 74.2 — 47.1 65.8 472 225

2.95 429 73.4 — 45.7 64.6 455 217

3.00 415 72.8 — 44.5 63.5 440 210

3.05 401 72.0 — 43.1 62.3 425 202

3.10 388 71.4 — 41.8 61.1 410 195

3.15 375 70.6 — 40.4 59.9 396 188

3.20 363 70.0 — 39.1 58.7 383 182

3.25 352 69.3 (110.0) 37.9 57.6 372 176

3.30 341 68.7 (109.0) 36.6 56.4 360 170

3.35 331 68.1 (108.5) 35.5 55.4 350 166

3.40 321 67.5 (108.0) 34.3 54.3 339 160

3.45 311 66.9 (107.5) 33.1 53.3 328 155

3.50 302 66.3 (107.0) 32.1 52.2 319 150

3.55 293 65.7 (106.0) 30.9 51.2 309 145

3.60 285 65.3 (105.5) 29.9 50.3 301 141

3.65 277 64.6 (104.5) 28.8 49.3 292 137

3.70 269 64.1 (104.0) 27.6 48.3 284 133

3.75 262 63.6 (103.0) 26.6 47.3 276 129

3.80 255 63.0 (102.0) 25.4 46.2 269 126

3.85 248 62.5 (101.0) 24.2 45.1 261 122

3.90 241 61.8 100.0 22.8 43.9 253 118

3.95 235 61.4 99.0 21.7 42.9 247 115

4.00 229 60.8 98.2 20.5 41.9 241 111

4.05 223 59.7 97.3 (18.8) — 234 —

4.10 217 59.2 96.4 (17.5) — 228 105

4.15 212 58.5 95.5 (16.0) — 222 102

4.20 207 57.8 94.6 (15.2) — 218 100

4.25 201 57.4 93.8 (13.8) — 212 98

4.30 197 56.9 92.8 (12.7) — 207 95

4.35 192 56.5 91.9 (11.5) — 202 93

4.40 187 55.9 90.7 (10.0) — 196 90

4.45 183 55.5 90.0 (9.0) — 192 89

4.50 179 55.0 89.0 (8.0) — 188 87

4.55 174 53.9 87.8 (6.4) — 182 85

4.60 170 53.4 86.8 (5.4) — 178 83

4.65 167 53.0 86.0 (4.4) — 175 81

4.70 163 52.5 85.0 (3.3) — 171 79

4.80 156 51.0 82.9 (.9) — 163 76

4.90 149 49.9 80.8 — — 156 73

5.00 143 48.9 78.7 — — 150 71

5.10 137 47.4 76.4 — — 143 67

5.20 131 46.0 74.0 — — 137 65

5.30 126 45.0 72.0 — — 132 63

5.40 121 43.9 69.8 — — 127 60

5.50 116 42.8 67.6 — — 122 58

5.60 111 41.9 65.7 — — 117 56

NOTE: Values in ( ) are beyond normal range and are given for information only.

NOTE: The Brinell values in this table are based on the use of a 10mm tungsten carbide ball; at hardness levels of 429 Brinell and below, the values obtained with the tungsten carbide ball, the Hultgren ball, and the standard ball are the same.

Gerdau MACSTEEL Home | Gerdau MACSTEEL Atmosphere Annealing
Profile | Capabilities | Quality | Engineered Bar Products | NitroSteel Division
Heating Treating Division | Capital Improvement | News Releases/Hot Links | Site Map | Contact Info | Metallurgical Data Book

Hardness Conversion Tables
Based on Brinell (Approximate)
BRINELL HARDNESS		ROCKWELL HARDNESS				Diamond Pyramid Hardness Number (Vickers)	Approx. Tensile Strength 1000 psi
BRINELL HARDNESS		ROCKWELL HARDNESS
Diameter mm 3000 Kg	Tungsten Carbide 10 mm Ball	A-Scale 60 Kg Brale	B-Scale 100 Kg 1/16" Ball	C-Scale 150 Kg Brale	Superficial 30N


—	—	86.5	—	70.0	86.0	1076	—
—	—	86.0	—	69.0	85.0	1004	—
—	—	85.6	—	68.0	84.4	940	—
—	—	85.0	—	67.0	83.6	900	—
—	757	84.4	—	65.9	82.7	860	—
2.25	745	84.1	—	65.3	82.2	840	—
—	722	83.4	—	64.0	81.1	800	—
—	710	83.0	—	63.3	80.4	780	—
2.35	682	83.2	—	61.7	79.0	737	—
2.40	653	81.2	—	60.0	77.5	697	—
2.45	627	80.5	—	58.7	76.3	667	323
2.50	601	79.8	—	57.3	75.1	640	309
2.55	578	79.1	—	56.0	73.9	615	297
2.60	555	78.4	—	54.7	72.7	591	285
2.65	534	77.8	—	53.5	71.6	569	274
2.70	514	76.9	—	52.1	70.3	547	263
2.75	495	76.3	—	51.0	69.4	528	253
2.80	477	75.6	—	49.6	68.2	508	243
2.85	461	74.9	—	48.5	67.2	491	235
2.90	444	74.2	—	47.1	65.8	472	225
2.95	429	73.4	—	45.7	64.6	455	217
3.00	415	72.8	—	44.5	63.5	440	210
3.05	401	72.0	—	43.1	62.3	425	202
3.10	388	71.4	—	41.8	61.1	410	195
3.15	375	70.6	—	40.4	59.9	396	188
3.20	363	70.0	—	39.1	58.7	383	182
3.25	352	69.3	(110.0)	37.9	57.6	372	176
3.30	341	68.7	(109.0)	36.6	56.4	360	170
3.35	331	68.1	(108.5)	35.5	55.4	350	166
3.40	321	67.5	(108.0)	34.3	54.3	339	160
3.45	311	66.9	(107.5)	33.1	53.3	328	155
3.50	302	66.3	(107.0)	32.1	52.2	319	150
3.55	293	65.7	(106.0)	30.9	51.2	309	145
3.60	285	65.3	(105.5)	29.9	50.3	301	141
3.65	277	64.6	(104.5)	28.8	49.3	292	137
3.70	269	64.1	(104.0)	27.6	48.3	284	133
3.75	262	63.6	(103.0)	26.6	47.3	276	129
3.80	255	63.0	(102.0)	25.4	46.2	269	126
3.85	248	62.5	(101.0)	24.2	45.1	261	122
3.90	241	61.8	100.0	22.8	43.9	253	118
3.95	235	61.4	99.0	21.7	42.9	247	115
4.00	229	60.8	98.2	20.5	41.9	241	111
4.05	223	59.7	97.3	(18.8)	—	234	—
4.10	217	59.2	96.4	(17.5)	—	228	105
4.15	212	58.5	95.5	(16.0)	—	222	102
4.20	207	57.8	94.6	(15.2)	—	218	100
4.25	201	57.4	93.8	(13.8)	—	212	98
4.30	197	56.9	92.8	(12.7)	—	207	95
4.35	192	56.5	91.9	(11.5)	—	202	93
4.40	187	55.9	90.7	(10.0)	—	196	90
4.45	183	55.5	90.0	(9.0)	—	192	89
4.50	179	55.0	89.0	(8.0)	—	188	87
4.55	174	53.9	87.8	(6.4)	—	182	85
4.60	170	53.4	86.8	(5.4)	—	178	83
4.65	167	53.0	86.0	(4.4)	—	175	81
4.70	163	52.5	85.0	(3.3)	—	171	79
4.80	156	51.0	82.9	(.9)	—	163	76
4.90	149	49.9	80.8	—	—	156	73
5.00	143	48.9	78.7	—	—	150	71
5.10	137	47.4	76.4	—	—	143	67
5.20	131	46.0	74.0	—	—	137	65
5.30	126	45.0	72.0	—	—	132	63
5.40	121	43.9	69.8	—	—	127	60
5.50	116	42.8	67.6	—	—	122	58
5.60	111	41.9	65.7	—	—	117	56

NOTE:	Values in ( ) are beyond normal range and are given for information only.
NOTE:	The Brinell values in this table are based on the use of a 10mm tungsten carbide ball; at hardness levels of 429 Brinell and below, the values obtained with the tungsten carbide ball, the Hultgren ball, and the standard ball are the same.