Seamless mechanical tubing is made from high-quality steel, often through the hot rolling or cold drawing process. It is characterized by its uniformity in shape, wall thickness, and diameter, providing excellent dimensional accuracy. This tubing is available in various grades, including carbon steel, alloy steel, and stainless steel.
The seamless mechanical tubing’s application scenarios are commonly used in applications that require high-strength, pressure-resistant tubing, such as in hydraulic cylinders, piston rods, and mechanical components in industrial machinery. It is also utilized in the automotive industry for chassis components, drive shafts, and other structural parts where reliability and durability are crucial. Additionally, seamless mechanical tubing finds application in oil and gas drilling, construction equipment, and aerospace industries. Due to its seamless construction, this tubing offers enhanced performance under demanding conditions, making it a preferred choice in many mechanical and structural applications.
API 5L Line Pipe Manufcaturing Process
Specification of API 5L Line Pipe
OD:38.1mm~12-3/4″323.8mm
WT: 1-12mm
Length: ≤9M
| Outside Diameter Size Range, | Outside Diameter Tolerance, in. (mm) | ||
| in. (mm) | Over | Under | |
| Up to 2.999 (76.17) | 0.020 (0.51) | 0.020 (0.51) | |
| 3.000-4.499 (76.20-114.27) | 0.025 (0.64) | 0.025 (0.64) | |
| 4.500-5.999 (114.30-152.37) | 0.031 (0.79) | 0.031 (0.79) | |
| 6.000-7.499 (152.40-190.47) | 0.037 (0.94) | 0.037 (0.94) | |
| 7.500-8.999 (190.50-228.57) | 0.045 (1.14) | 0.045 (1.14) | |
| 9.000-10.750 (228.60-273.05) | 0.050 (1.27) | 0.050 (1.27) |
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 |
AThe ranges and limits given in this table apply to heat analysis; except as required by 6.1, product analyses are subject to the applicable additional tolerances given in Table Numbers.
Table S2 Typical Tensile Properties. Hardness and Thermal
Condition for some of the More Common Grades of Carbon and Alloy Steels
| Grade Desig- ration | Condition | Ultimate Srength. | Yield Strength. | Elongation in 2 in or 50 mm. % | Rockwell. Hardness B Scale | ||
| ksi | MPa | ksi | MPa | ||||
| 1020 | HR | 50 | 345 | 32 | 221 | 25 | 55 |
| CW | 70 | 483 | 60 | 414 | 5 | 75 | |
| SR | 66 | 448 | 50 | 345 | 10 | 72 | |
| A | 48 | 331 | 28 | 193 | 30 | 50 | |
| N | 55 | 379 | 34 | 234 | 22 | 60 | |
| 1025 | HR | 55 | 379 | 35 | 241 | 25 | 60 |
| CW | 75 | 517 | 65 | 448 | 5 | 80 | |
| SR | 70 | 483 | 55 | 379 | 8 | 75 | |
| A | 53 | 365 | 30 | 207 | 25 | 57 | |
| N | 55 | 379 | 36 | 248 | 22 | 60 | |
| 1035 | HR | 65 | 448 | 40 | 276 | 20 | 72 |
| CW | 85 | 586 | 75 | 517 | 5 | 88 | |
| SR | 75 | 517 | 65 | 448 | 8 | 80 | |
| A | 60 | 414 | 33 | 228 | 25 | 67 | |
| N | 65 | 448 | 40 | 276 | 20 | 72 | |
| 1045 | HR | 75 | 517 | 45 | 310 | 15 | 80 |
| CW | 90 | 621 | 80 | 552 | 5 | 90 | |
| SR | 80 | 552 | 70 | 483 | 8 | 85 | |
| A | 65 | 448 | 35 | 241 | 20 | 72 | |
| N | 75 | 517 | 48 | 331 | 15 | 80 | |
| 1050 | HR | 80 | 552 | 50 | 345 | 10 | 85 |
| SR | 82 | 566 | 70 | 483 | 6 | 86 | |
| A | 68 | 469 | 38 | 262 | 18 | 74 | |
| N | 78 | 538 | 50 | 345 | 12 | 82 | |
| 1118 | HR | 50 | 345 | 35 | 241 | 25 | 55 |
| CW | 75 | 517 | 60 | 414 | 5 | 80 | |
| SR | 70 | 483 | 55 | 379 | 8 | 75 | |
| A | 50 | 345 | 30 | 207 | 25 | 55 | |
| N | 55 | 379 | 35 | 241 | 20 | 60 | |
| 1137 | HR | 70 | 483 | 40 | 276 | 20 | 75 |
| CW | 80 | 552 | 65 | 448 | 5 | 85 | |
| SR | 75 | 517 | 60 | 414 | 8 | 80 | |
| A | 66 | 448 | 35 | 241 | 22 | 72 | |
| N | 70 | 483 | 43 | 296 | 15 | 75 | |
| 4130 | HR | 90 | 621 | 70 | 483 | 20 | 89 |
| SR | 105 | 724 | 85 | 586 | 10 | 95 | |
| A | 75 | 517 | 55 | 379 | 30 | 81 | |
| N | 90 | 621 | 60 | 414 | 20 | 89 | |
| 4140 | HR | 120 | 855 | 90 | 621 | 15 | 100 |
| SR | 120 | 855 | 100 | 689 | 10 | 100 | |
| A | 80 | 552 | 60 | 414 | 25 | 85 | |
| N | 120 | 855 | 90 | 621 | 20 | 100 | |
A Tre following are the symbol definitions for the various conditions
HR—Hot Rolled
CW—Cold Worked
SR—Stress Relieved
A—Annealed
N—Normalized
Bare, Light Oiled, Black/Red/Yellow Painting, Zinc/Anti-corrosive Coating
Plastic Caps Plugged, Bundled/in Bulk, Waterproof Paper Wrapped
We’re capable of manufacturing structural pipes in various sizes, complying with European, Chinese, American, and Japanese standards. We ensure quick delivery and offer flexible payment options. Our tube production processes undergo rigorous control, meeting stringent quality standards. Each tube undergoes inspection before shipment, and we also welcome third-party inspection.
