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1.1 ,This specification covers several grades of carbon and alloy steel seamless mechanical tubing. The grades are listed in Tables 1-3. When welding is used for joining the weldable mechanical tube grades, the welding procedure shall be suitable for the grade, the condition of the components, and the intended service.
TABLE 1 Chemical Requirements of Low-Carbon Steels
| Grade Designation | Chemical Composition Limits, % | |||
| CarbonA | ManganeseB | Phosphorous,B | Sulfur,B | |
| , | , | , | , | , |
| MT 1010 | 0.05–,0.15 | 0.30–,0.60 | 0.040 | 0.050 |
| MT 1015 | 0.10–,0.20 | 0.30–,0.60 | 0.040 | 0.050 |
| MT X 1015 | 0.10–,0.20 | 0.60–,0.90 | 0.040 | 0.050 |
| MT 1020 | 0.15–,0.25 | 0.30–,0.60 | 0.040 | 0.050 |
| MT X 1020 | 0.15–,0.25 | 0.70–,1.00 | 0.040 | 0.050 |
(A) ,Limits apply to heat and product analyses.