1.1 This specification covers carbon steel girder rails2 of three classes based on type or type and weight, and chemistry defined as follows and in Table 1.
|
|
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 |
1.1.1 Unless otherwise specified by the purchaser, girder-guard rails shall be Class A.
1.1.2 Plain and grooved-girder rails under 135 lb/yd (67.1 kg/m) in weight shall be specified by the purchaser as either Class A or Class B.
1.1.3 Plain and grooved-girder rails of 135 lb/yd in weight and heavier shall be Class C, unless otherwise specified.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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