BS 970 070 M50 steel Description
BS 970 070 M50 steel steel is a medium carbon steel is used when greater strength and hardness is desired than in the "as rolled" condition.
BS 970 070 M50 steel Applications
Quenched and subsequently tempered steel for screws, forgings, wheel tyres, shafts, sickles, axes, knives, wood working drills, hammers, etc
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| 070 M 50 BS 970 Number: 1.0540 | Comparison of steel grades | |
| JUS | Č.16301 | |
| DIN | C50 | |
| BS | - | |
| GOST | - | |
| AISI | - | |
| UNI | - | |
| NF | (AF70C55) | |
Chemical analysis -% by mass* of C50 steel
| Chemical elements | C | Si max. | Mn | P max. | S max. | Cr max. | Mo max. | Ni max. | Cr+Mo+Ni max. |
| %, by mass | 0,47-0,55 | 0,40 | 0,60-0,90 | 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 controlpurposes. 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 and normalized and tempered conditions of C50 steel
| Thickness of ruling section tR | |||||
| Diameter in mm | tR≤ 100mm | 100 < tR≤250mm | 250 < tR≤500mm | 500 < tR≤1000mm | |
| Remin (N/mm2) | 320 | 290 | - | - | |
| Rmmin (N/mm2) | 610 | 590 | - | - | |
| A % min. | l-longitudinal | 14 | 14 | - | - |
| 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 |
| 810 to 850 | Oil or water | 550 to 660 | 830 to 870 |
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