Complaint
| Chemical Components (%) | |||||||
| C | Si | Mn | P | S | Mo | Cr | V |
| 0.06-0.18 | / | 0.27-0.63 | ≤0.035 | ≤0.035 | / | / | / |
| Mechanical Properties | |||
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) | Hardness (HRB) |
| ≥325 | ≥180 | ≥35 | ≤72 |
| Seamless, Cold-Finished Tubes | ||
| Outside Diameter In. (mm) | Wall thickness Tolerance % | |
| Over (+) | Under (-) | |
| 1 ½ (38.1) and under | 20 | 0 |
| Over 1½ (38.1) | 22 | 0 |
| Cold-Finished Seamless Tubes | ||
| Outside Diameter In. (mm) | Permissible Variations In. (mm) | |
| Over (+) | Under (-) | |
| Under 1 (25.4) | 0.004 (0.1) | 0.004 (0.1) |
| 1 to 1 ½ (25.4 to 38.1), Incl | 0.006 (0.15) | 0.006 (0.15) |
| Over 11⁄2 to 2 [38.1 to 50.8], Excl | 0.008 (0.2) | 0.008 (0.2) |
| 2 to 21⁄2 [50.8 to 63.5], Excl | 0.010 (0.25) | 0.010 (0.25) |
| 21⁄2 to 3 [63.5 to 76.2], Excl | 0.012 (0.3) | 0.012 (0.3) |
| Cold-Finished Seamless Tubes | ||
| Outside Diameter, In.(mm) | Cut Length ,in.(mm) | |
| Over(+) | Under(-) | |
| All Sizes | 3⁄16 [5] | 0 [0] |
| Under 2 [50.8] | 1⁄8 [3] | 0 [0] |
| 2 [50.8] and over | 3⁄16 [5] | 0 [0] |
| Under 2 [50.8] | 1⁄8 [3] | 0 [0] |
| 2 [50.8] and over | 3⁄16 [5] | 0 [0] |
| These permissible variations in length apply to tubes before bending. They apply to cut lengths up to and including 24 ft [7.3 m]. For lengths greater than 24 ft [7.3 m], the above over-tolerances shall be increased by 1⁄8 in. [3 mm] for each 10 ft [3 m] or fraction thereof over 24 ft or 1⁄2 in. [13 mm], whichever is the lesser. | ||
| OD (mm) | Thickness (mm) | OD (mm) | Thickness (mm) | OD (mm) | Thickness (mm) |
| Φ13.1 | 1.5-3 | Φ35.9 | 1.5-7 | Φ49.2 | 1.5-10 |
| Φ19.25 | 1.5-5 | Φ36.6 | 1.5-7 | Φ49.5 | 1.5-10 |
| Φ22 | 1.5-5 | Φ38 | 1.5-8 | Φ52.3 | 1.5-10 |
| Φ22.2 | 1.5-5 | Φ38.4 | 1.5-8 | Φ53.8 | 1.5-10 |
| Φ25 | 1.5-6 | Φ40 | 1.5-10 | Φ57 | 1.5-10 |
| Φ26.3 | 1.5-6 | Φ40.2 | 1.5-10 | Φ59 | 1.5-10 |
| Φ27 | 1.5-6 | Φ40.9 | 1.5-10 | Φ60 | 1.5-11 |
| Φ28 | 1.5-6 | Φ41.3 | 1.5-10 | Φ62.5 | 1.5-11 |
| Φ30 | 1.5-6 | Φ41.6 | 1.5-10 | Φ74 | 1.5-11 |
| Φ30.25 | 1.5-6 | Φ42 | 1.5-10 | Φ75 | 1.5-11 |
| Φ30.9 | 1.5-6 | Φ43 | 1.5-10 | Φ76 | 1.5-11 |
| Φ31 | 1.5-7 | Φ44.5 | 1.5-10 | Φ89 | 1.5-15 |
| Φ32 | 1.5-7 | Φ45.8 | 1.5-10 | Φ93 | 1.5-15 |
| Φ35 | 1.5-7 | Φ46.1 | 1.5-10 | Φ19-Φ121 | 1.5-15 |
| Φ35.5 | 1.5-7 | Φ47.8 | 1.5-10 |
| OD | Standard tolerance | Special tolerance | |||
| Outer Diameter | GB/T3639 | DIN2391 | EN10305 | O D | thickness |
| 4mm-20mm | ±0.10 mm | ±0.08 mm | ±0.08 mm | ±0.05mm | ±0.05mm |
| 20mm-30mm | ±0.10 mm | ±0.08 mm | ±0.08 mm | ±0.08 mm | ±0.08 mm |
| 31mm-40mm | ±0.15 mm | ±0.15 mm | ±0.15 mm | ±0.10 mm | ±0.08 mm |
| 41mm-60mm | ±0.20 mm | ±0.20 mm | ±0.20 mm | ±0.15 mm | ±0.15 mm |
| 61mm-80mm | ±0.30 mm | ±0.30 mm | ±0.30 mm | ±0.20 mm | ±0.20 mm |
| 81mm-120mm | ±0.45 mm | ±0.40 mm | ±0.40 mm | ±0.30 mm | ±0.30 mm |
