[ Chemical requirements,%]
| Class A | Class B | Class C | |
| carbon | 0.60-0.75 | 0.70-0.85 | 0.75-0.90 |
| manganese | 0.60-0.90 | 0.60-0.90 | 0.60-0.90 |
| phosphorus,max | 0.04 | 0.04 | 0.04 |
| silicon | 0.10-0.40 | 0.10-0.40 | 0.10-0.40 |
[ Hardness Properties]
1.Tesr specimens:
1.1 Three representative sections of rail from each heat shall be selected as test soecimens.
1.2 Excess sacle and decarburization shall be removed from the test area of the head or web of the selected soecimens.
2. Procedure:
1. The test shall be conducted in accordance with Test Method E10.
3. Requirements:
1. Class A rail shall have a Birnell hardness of 248 to 293,and Classes B and C shall have hardnesses of 269 to 321.
2. Retests---- If the average depth of the impressions obtained on the head of the three specimens from any heat fails to conform to the requirements specified in 7.3,the manufacturer may at his option retest the specimens,or each rail from that heat. Rails represented by retests which conform to the requirements of 7.3 shall be accepted.
