Description
Seamless steel pipe, as the name suggests, is a pipe without a seam or a weld-joint. Seamless steel pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow — liquids and gases (fluids), slurries, powders and masses of small solids.
Standard: ASTM A106/A53/A500/ASME SA106/SA53/DIN1629/JIS G3444/G3445/G3452
Certificate: ISO 9001, ISO 14001, ISO 45001, CE
Out Diameter: 1/8 - 36inch (10.3-914.4mm)
Wall Thickness: 1.25 - 50mm
Length: Random Length, Fixed Length, SRL, DRL
Steel Grade:
ASTM A53/ASTM A106: GR A, GR B, GR CASME
ASME A500: GR.A, GR.B, GR.C, GR.D
Test Required:
Chemical Analysis, Mechanical Test, Visusal Inspection , Tension Test, Dimension Check, Bend Test , Flattenting Test, Impact Test, DWT Test, NDT Test, Hydrostatic Test, Hardness Test
Chemical Composition and Mechanical Properties
| Standard | Grade | Chemical Components (%) | Mechanical Properties |
| | | C | Si | Mn | P | S | Tensile STrength(Mpa) | Yield STrength(Mpa) |
| ASTM A53 | A | ≤0.25 | - | ≤0.95 | ≤0.05 | ≤0.06 | ≥330 | ≥205 |
| | B | ≤0.30 | - | ≤1.2 | ≤0.05 | ≤0.06 | ≥415 | ≥240 |
| ASTM A106 | A | ≤0.30 | ≥0.10 | 0.29-1.06 | ≤0.035 | ≤0.035 | ≥415 | ≥240 |
| | B | ≤0.35 | ≥0.10 | 0.29-1.06 | ≤0.035 | ≤0.035 | ≥485 | ≥275 |
| ASTM A500 | A | ≤0.26 | - | ≤1.35 | ≤0.035 | ≤0.035 | ≥310 | ≥230 |
| | B | ≤0.30 | - | ≤1.40 | ≤0.045 | ≤0.045 | ≥400 | ≥290 |
| | C | ≤0.23 | - | ≤1.35 | ≤0.035 | ≤0.035 | ≥425 | ≥315 |
| | D | ≤0.27 | - | ≤1.40 | ≤0.045 | ≤0.045 | ≥400 | ≥250 |
Tolerances of carbon seamless steel pipe
| Pipe types | Pipe sizes(mm) | Tolerances |
| Hot rolled | OD<50 | ±0.50mm |
| | OD≥50 | ±1% |
| | WT<4 | ±12.5% |
| | WT 4～20 | +15%, -12.5% |
| | WT>20 | ±12.5% |
| Cold drawn | OD 6～10 | ±0.20mm |
| | OD 10～30 | ±0.40mm |
| | OD 30～50 | ±0.45 |
| | OD>50 | ±1% |
| | WT≤1 | ±0.15mm |
| | WT 1～3 | +15%, -10% |
| | WT >3 | +12.5%, -10% |
| NOMINAL PIPE SIZE | OD (mm) | NOMINAL WALL THICKNESS |
| DN | NB(inch) | ASME | SCH10 | SCH20 | SCH30 | STD | SCH40 | SCH60 | XS | SCH80 | SCH100 | SCH120 | SCH140 | SCH160 | XXS |
| 15 | 1/2" | 21.3 | 2.11 | | 2.41 | 2.77 | 2.77 | | 3.73 | 3.73 | | | | 4.78 | 7.47 |
| 20 | 3/4" | 26.7 | 2.11 | | 2.41 | 2.87 | 2.87 | | 3.91 | 3.91 | | | | 5.56 | 7.82 |
| 25 | 1" | 33.4 | 2.77 | | 2.9 | 3.38 | 3.38 | | 4.55 | 4.55 | | | | 6.35 | 9.09 |
| 32 | 1.1/4" | 42.2 | 2.77 | | 2.97 | 3.56 | 3.56 | | 4.85 | 4.85 | | | | 6.35 | 9.7 |
| 40 | 1.1/2" | 48.3 | 2.77 | | 3.18 | 3.68 | 3.68 | | 5.08 | 5.08 | | | | 7.14 | 10.15 |
| 50 | 2" | 60.3 | 2.77 | | 3.18 | 3.91 | 3.91 | | 5.54 | 5.54 | | | | 8.74 | 11.07 |
| 65 | 2.1/2" | 73 | 3.05 | | 4.78 | 5.16 | 5.16 | | 7.01 | 7.01 | | | | 9.53 | 14.02 |
| 80 | 3" | 88.9 | 3.05 | | 4.78 | 5.49 | 5.49 | | 7.62 | 7.62 | | | | 11.13 | 15.25 |
| 90 | 3.1/2" | 101.6 | 3.05 | | 4.78 | 5.74 | 5.74 | | 8.08 | 8.08 | | | | | |
| 100 | 4" | 114.3 | 3.05 | | 4.78 | 6.02 | 6.02 | | 8.56 | 8.56 | | 11.13 | | 13.49 | 17.12 |
| 125 | 5" | 141.3 | 3.4 | | | 6.55 | 6.55 | | 9.53 | 9.53 | | 12.7 | | 15.88 | 19.05 |
| 150 | 6" | 168.3 | 3.4 | | | 7.11 | 7.11 | | 10.97 | 10.97 | | 14.27 | | 18.26 | 21.95 |
| 200 | 8" | 219.1 | 3.76 | 6.35 | 7.04 | 8.18 | 8.18 | 10.31 | 12.7 | 12.7 | 15.09 | 18.26 | 20.62 | 23.01 | 22.23 |
| 250 | 10" | 273 | 4.19 | 6.35 | 7.8 | 9.27 | 9.27 | 12.7 | 12.7 | 15.09 | 18.26 | 21.44 | 25.4 | 28.58 | 25.4 |
| 300 | 12" | 323.8 | 4.57 | 6.35 | 8.38 | 9.53 | 10.31 | 14.27 | 12.7 | 17.48 | 21.44 | 25.4 | 28.58 | 33.32 | 25.4 |
| 350 | 14" | 355.6 | 6.35 | 7.92 | 9.53 | 9.53 | 11.13 | 15.09 | 12.7 | 19.05 | 23.83 | 27.79 | 31.75 | 35.71 | |
| 400 | 16" | 406.4 | 6.35 | 7.92 | 9.53 | 9.53 | 12.7 | 16.66 | 12.7 | 21.44 | 26.19 | 30.96 | 36.53 | 40.19 | |
| 450 | 18" | 457.2 | 6.35 | 7.92 | 11.13 | 9.53 | 14.27 | 19.05 | 12.7 | 23.83 | 39.36 | 34.93 | 39.67 | 45.24 | |
| 500 | 20" | 508 | 6.35 | 9.53 | 12.7 | 9.53 | 15.09 | 20.62 | 12.7 | 26.19 | 32.54 | 38.1 | 44.45 | 50.01 | |
| 550 | 22" | 558.8 | 6.35 | 9.53 | 12.7 | 9.53 | | 22.23 | 12.7 | 28.58 | 34.93 | 41.28 | 47.63 | 53.98 | |
| 600 | 24" | 609.6 | 6.35 | 9.53 | 14.27 | 9.53 | 17.48 | 24.61 | 12.7 | 30.96 | 38.89 | 46.02 | 52.37 | 59.54 | |
| 650 | 26" | 660.4 | 7.92 | 12.7 | | 9.53 | | | 12.7 | | | | | | |
| 700 | 28" | 711.2 | 7.92 | 12.7 | 15.88 | 9.53 | | | 12.7 | | | | | | |
| 750 | 30" | 762 | 7.92 | 12.7 | 15.88 | 9.53 | | | 12.7 | | | | | | |
| 800 | 32" | 812.8 | 7.92 | 12.7 | 15.88 | 9.53 | 17.48 | | 12.7 | | | | | | |
| 850 | 34" | 863.6 | 7.92 | 12.7 | 15.88 | 9.53 | 17.48 | | 12.7 | | | | | | |
| 900 | 36" | 914.4 | 7.92 | 12.7 | 15.88 | 9.53 | 19.05 | | 12.7 | | | | | | |
Standard
| ASTM A53 | Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless |
| ASTM A106 | Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service |
| ASTM A500 | Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes |
Hot Rolling Seamless Steel Line Pipe Manufacturing / Production processes
Rolled Round Billets – Examination – Cut Off – Heating – Piercing – Elongation – Slight Tension Reducing – Straightening – Corp End Cutting Off – Visual Inspection – NDT – Hydrostatic Test – Ends Procession – Product Inspection – Painting and Marking – Packing – Warehousing
Cold Drawn (Rolled) seamless steel pipe manufacturing process
Mother pipe (Normally for hot rolled pipe) – Inspection – Annealing – Ends Treatment (Hitting and Drilling hole) – Pickling – Grinding – Phosphorization (Annoit) – Cold Drawn (Rolled) – Degreasing and Cleaning – Heat treatment (Solution treatment) – Straightening – Hydrostatic test – Painting and Marking – Warehousing
Process
