1.1This 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
| Phosphorus,B max
| Sulfur,B max
|
|
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 |
TABLE 2 Chemical Requirements of Other Carbon Steels
Grade Designation
| Chemical Composition Limits, %A
|
Carbon
| Manganese
| Phosphorus, max
| Sulfur, max
|
|
1008 | 0.10 max | 0.30–0.50 | 0.040 | 0.050 |
1010 | 0.08–0.13 | 0.30–0.60 | 0.040 | 0.050 |
1012 | 0.10–0.15 | 0.30–0.60 | 0.040 | 0.050 |
1015 | 0.13–0.18 | 0.30–0.60 | 0.040 | 0.050 |
1016 | 0.13–0.18 | 0.60–0.90 | 0.040 | 0.050 |
1017 | 0.15–0.20 | 0.30–0.60 | 0.040 | 0.050 |
1018 | 0.15–0.20 | 0.60–0.90 | 0.040 | 0.050 |
1019 | 0.15–0.20 | 0.70–1.00 | 0.040 | 0.050 |
1020 | 0.18–0.23 | 0.30–0.60 | 0.040 | 0.050 |
1021 | 0.18–0.23 | 0.60–0.90 | 0.040 | 0.050 |
1022 | 0.18–0.23 | 0.70–1.00 | 0.040 | 0.050 |
1025 | 0.22–0.28 | 0.30–0.60 | 0.040 | 0.050 |
1026 | 0.22–0.28 | 0.60–0.90 | 0.040 | 0.050 |
1030 | 0.28–0.34 | 0.60–0.90 | 0.040 | 0.050 |
1035 | 0.32–0.38 | 0.60–0.90 | 0.040 | 0.050 |
1040 | 0.37–0.44 | 0.60–0.90 | 0.040 | 0.050 |
1045 | 0.43–0.50 | 0.60–0.90 | 0.040 | 0.050 |
1050 | 0.48–0.55 | 0.60–0.90 | 0.040 | 0.050 |
1518 | 0.15–0.21 | 1.10–1.40 | 0.040 | 0.050 |
1524 | 0.19–0.25 | 1.35–1.65 | 0.040 | 0.050 |
1541 | 0.36–0.44 | 1.35–1.65 | 0.040 | 0.050 |
1.2This specification covers both seamless hot-finished mechanical tubing and seamless cold-finished mechanical tubing in sizes up to and including 12 3/4in. (323.8 mm) outside diameter for round tubes with wall thicknesses as required.
1.3The tubes shall be furnished in the following shapes, as specified by the purchaser: round, square, rectangular, and special sections.
1.4Supplementary requirements of an optional nature are provided and when desired shall be so stated in the order.
1.5The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.