q235b硬度及强度换算硬度洛氏表面洛氏维氏布氏(F/D²=30) HRC HRA HR15N HR30N HR45N HV HBS HBW  20.0 20.5 21.0 21.5 22.0 22.5 23.0 23.5 24.0 24.5 25.0 25.5 26.0 26.5 27.0 27.5 28.0 28.5 29.0 29.5 30.0 30.5 31.0 31.5 32.0 32.5  60.2 60.4 60.7 61.0 61.2 61.5 61.7 62.0 62.2 62.5 62.8 63.0 63.3 63.5 63.8 64.0 64.3 64.6 64.8 65.1 65.3 65.6 65.8 66.1 66.4 66.6  68.8 69.0 69.3 69.5 69.8 70.0 70.3 70.6 70.8 71.1 71.4 71.6 71.9 72.2 72.4 72.7 73.0 73.3 73.5 73.8 74.1 74.4 74.7 74.9 75.2 75.5  40.7 41.2 41.7 42.2 42.6 43.1 43.6 44.0 44.5 45.0 45.5 45.9 46.4 46.9 47.3 47.8 48.3 48.7 49.2 49.7 50.2 50.6 51.1 51.6 52.0 52.5  19.2 19.8 20.4 21.0 21.5 22.1 22.7 23.3 23.9 24.5 25.1 25.7 26.3 26.9 27.5 28.1 28.7 29.3 29.9 30.5 31.1 31.7 32.3 32.9 33.5 34.1  226 228 230 233 235 238 241 244 247 250 253 256 259 262 266 269 273 276 280 284 288 292 296 300 304 308  225 227 229 232 234 237 240 242 245 248 251 254 257 260 263 266 269 273 276 280 283 287 291 294 298 302