Межгосударственный стандарт ГОСТ 4543-71 "Прокат из легированной конструкционной стали. Технические условия" (утв. постановлением Госстандарта СССР от 18 июня 1971 г. N 1148) стр. 24

7,5 | 28,5 | - | 31 | - | 32,5 | 22 | 34,0 | 20,0 | 43,5 | 33,5 | 45,0 | 32,0 | 47,0 | 33,0 | 50,0 | 30
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9,0 | 24,5 | - | 27 | - | 29,5 | - | 30,5 | - | 39,5 | 31,0 | 41,0 | 29,0 | 45,0 | 29,0 | 47,0 | 27
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10,5 | 22 | - | 24 | - | 26,5 | - | 28,0 | - | 36,0 | 28,5 | 37,5 | 26,5 | 42,0 | 28,0 | 44,0 | 26
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12,0 | 20,5 | - | 22,5 | - | 24,5 | - | 26,5 | - | 33,0 | 26,5 | 34,5 | 24,5 | 39,5 | 25,5 | 42,0 | 23
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13,5 | - | - | 21 | - | 23 | - | 25,0 | - | 30,5 | 24,5 | 32,0 | 23,0 | 37,0 | 23,0 | 39,0 | 21
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15,0 | - | - | 20 | - | 22 | - | 24,0 | - | 29,0 | 23,0 | 30,0 | 22,0 | 36,0 | 22,0 | 37,0 | 20
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16,5 | - | - | - | - | 21,5 | - | 23,5 | - | 27,5 | - | 28,5 | - | 34,0 | 21,0 | 36,0 | 19
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18,0 | - | - | - | - | 21 | - | 22,5 | - | 26,5 | - | 27,5 | - | 33,0 | 20,0 | 34,5 | 18
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19,5 | - | - | - | - | 20 | - | 22,0 | - | 26,0 | - | 27,0 | - | | - | - | -
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21,0 | - | - | - | - | - | - | 21,5 | - | 25,0 | - | 26,5 | - | - | - | - | -
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24,0 | - | - | - | - | - | - | | - | 24,0 | - | 25,0 | - | - | - | - | -
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27,0 | - | - | - | - | - | - | - | - | 22,5 | - | 23,5 | - | - | - | - | -
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30,0 | - | - | - | - | - | - | - | - | 21,0 | - | 22,0 | - | - | - | - | -
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33,0 | - | - | - | - | - | - | - | - | 19,5 | - | 20,5 | - | - | - | - | -
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36,0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | -
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39,0 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | -
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Продолжение
--------+-------------------------------------------------------------------------------------------------------------------------------
Рассто-| Твердость для полос прокаливаемости, HRC
яние от+---------------+---------------+---------------+---------------+--------------+---------------+---------------+----------------
торца, | суженной | марочной | суженной | марочной | суженной | марочной | суженной | марочной
мм | | | | | | | |
+-------+-------+-------+-------+-------+-------+-------+-------+------+-------+-------+-------+-------+-------+-------+--------
| Макс | Мин | Макс | Мин | Макс | Мин | Макс | Мин. |Макс | Мин | Макс | Мин | Макс | Мин | Макс | Мин.
+-------+-------+-------+-------+-------+-------+-------+-------+------+-------+-------+-------+-------+-------+-------+--------
| Стали марок
+-------------------------------+-------------------------------+------------------------------+--------------------------------
| 40Х | 45Х | 18ХГТ | 30ХГТ
--------+-------+-------+-------+-------+-------+-------+-------+-------+------+-------+-------+-------+-------+-------+-------+--------
1,5 | 58,5 | 51 | 59,5 | 49 | 58 | 54 | 59 | 53 | 48 | 41 | 49 | 40 | 50,5 | 43,5 | 52 | 41,5
| | | | | | | | | | | | | | | |
3,0 | 58 | 49,5 | 59 | 48 | 57,5 | 52,5 | 58,5 | 51,5 | 46 | 39,5 | 48 | 38 | 49,5 | 42,5 | 51 | 40,5
| | | | | | | | | | | | | | | |
4,5 | 57 | 47,5 | 58 | 46,5 | 56,5 | 51 | 57,5 | 50 | 45 | 36 | 46 | 35 | 48,5 | 40,5 | 50 | 39