BS 970 070 M 40 steel plate high carbon steel
070 M 40 steel plate, BS 970 070 M 40 steel plate, under BS 970 tandard, we can regard 070 M 40 steel plate as high carbon steel.
070 M 40 steel plate is one mainly of high carbon steel,BS 970 070 M 40 steel plate is meduim Carbon Steels are similar to low carbon steel except that the carbon ranges from 0.30 to 0.60% & the manganese from 0.50 to 1.65%. Increasing the carbon content is approximately 0.5% with an accompanying increase in manganese allows medium carbon steels to be used in the quenched & tempered conditions. This steels are of particular importance because of unique combination of strength & toughness after heat treat treatment.
| 070 M 40 BS 970 Number: 1.0511 | Comparison of steel grades | |
| JUS | Č.14341 | |
| DIN | C40 | |
| BS | 080M40, EN8 | |
| GOST | 40 | |
| AISI | 1040 | |
| UNI | C40, | |
| NF | (AF60C40), (1C40) | |
070 M 40 steel Chemical analysis
| Chemical elements | C | Si max. | Mn | P max. | S max. | Cr max. | Mo max. | Ni max. | Cr+Mo+Ni max. |
| %, by mass | 0,37-0,44 | 0,40 | 0,50-0,80 | 0,045 | 0,045 | 0,40 | 0,10 | 0,40 | 0,63 |
| Permissible deviation | ± 0,02 | + 0,03 | ± 0,04 | + 0,005 | + 0,005 | + 0,05 | + 0,03 | + 0,05 |
At the option of the manufacturer the elements aluminium, titanium, vanadium and niobium may be added singly or in combination for grain size control purposes. Elements not quoted in table shall not be added to the steel without the agreement of the purchaser, except for the purpose of finishing the heat. Mechanical properties in the normalized conditions
070 M 40 steel Mechanical properties
| Thickness of ruling section tR | |||||
| Diameter in mm | tR≤ 100mm | 100 < tR≤250mm | 250 < tR≤500mm | 500 < tR≤1000mm | |
| Remin (N/mm2) | 290 | 260 | - | - | |
| Rmmin (N/mm2) | 550 | 530 | - | - | |
| A % min. | l-longitudinal | 17 | 17 | - | - |
| tr -transverse | - | - | - | - | |
| KV min * (J) | l-longitudinal | - | - | - | - |
| tr -transverse | - | - | - | - | |
1N/mm2=1MPa Heat treatment conditions
| Quenching Temperature,0C | Cooling medium | Tempering Temperature,0C | Normalizing temperature,0C |
| 830 to 870 | Water or oil | 550 to 660 | 850 to 890 |
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