Труба бесшовная CT 20 ГОСТ 8732-78
We are a professional manufacturer of Seamless pipe St20 GOST 8732-78 in China.Мы профессиональный производитель бесшовных труб St20 по ГОСТ 8732-78 в Китае.
GOST 8732-78 is a Russian standard for seamless pipes.
The standard applies to hot-rolled seamless steel pipes of general purpose, manufactured on the outer diameter, wall thickness and length.These pipes are designed for high-pressure, high-temperature, and critical applications in industries such as oil & gas, petrochemical, power generation, and mechanical engineering.
Specifications of GOST 8732-78 Ct20 Pipes
-
Standard: GOST 8732-78
-
Steel Grade: CT20 (Ст20 / Steel 20, a low-carbon steel)
-
Manufacturing method: Hot-finished seamless
-
Outer diameter: 20 mm – 550 mm
-
Wall thickness: 2 mm – 75 mm
Chemical Composition of GOST 8732-78 Ct20 steel pipes
| Element | Percentage Range |
|---|---|
| Carbon (C) | 0.07-0.14 |
| Manganese (Mn) | 0.35-0.65 |
| Silicon (Si) | 0.17-0.37 |
| Phosphorus (P) | ≤0.035 |
| Sulfur (S) | ≤0.035 |
Please note that the above figures are approximate ranges and may vary slightly depending on the specific grade.
Mechanical Properties of GOST 8732-78 Ct20 steel pipes
| Property | Value |
|---|---|
| Ultimate Tensile Strength (MPa) | ≥490 |
| Yield Strength (MPa) | ≥245 |
| Elongation (%) | ≥24 |
| Hardness | less than 156HB |
GOST 8732-78 Dimension Chart
| Outside diameter, mm | Mass of 1 m of pipes, kg, at wall thickness, mm | ||||||||||||||
| 2.5 | 2.6* | 2.8 | 3 | 3.2* | 3.5 | 4 | 4.5 | 5 | 5.5 | 6 | -6.5 | 7 | -7.5 | 8 | |
| 20* | 1.08 | 1.12 | 1.19 | 1.26 | 1.33 | 1.42 | 1.58 | – | – | – | – | – | – | – | – |
| 21.3* | 1.16 | 1.2 | 1.22 | 1.35 | 1.43 | 1.54 | 1.71 | – | – | – | – | – | – | – | – |
| 22* | 1.2 | 1.24 | 1.33 | 1.41 | 1.48 | 1.6 | 1.78 | – | – | – | – | – | – | – | – |
| 25 | 1.39 | 1.44 | 1.53 | 1.63 | 1.72 | 1.86 | 2.07 | 2.28 | 2.47 | 2.65 | 2.81 | 2.97 | 3.11 | 3.24 | 3.35 |
| 26.9* | 1.5 | 1.56 | 1.66 | 1.77 | 1.87 | 2.02 | 2.25 | 2.49 | 2.7 | 2.9 | 3.09 | 3.27 | 3.43 | 3.59 | 3.83 |
| 28 | 1.57 | 1.63 | 1.74 | 1.85 | 1.96 | 2.11 | 2.37 | 2.62 | 2.84 | 3.05 | 3.26 | 3.45 | 3.63 | 3.79 | 3.95 |
| 30* | 1.7 | 1.76 | 1.88 | 2 | 2.12 | 2.29 | 2.57 | 2.83 | 3.08 | 3.32 | 3.55 | 3.77 | 3.97 | 4.16 | 4.34 |
| 31.8* | 1.81 | 1.86 | 2 | 2.13 | 2.26 | 2.44 | 2.74 | 3.03 | 3.3 | 3.57 | 3.82 | 4.05 | 4.28 | 4.49 | 4.69 |
| 32 | 1.82 | 1.88 | 2.02 | 2.15 | 2.27 | 2.46 | 2.76 | 3.05 | 3.33 | 3.59 | 3.85 | 4.09 | 4.32 | 4.53 | 4.74 |
| 33.7* | 1.92 | 1.99 | 2.13 | 2.27 | 2.41 | 2.61 | 2.93 | 3.24 | 3.54 | 3.82 | 4.1 | 4.36 | 4.61 | 4.84 | 5.07 |
| 35* | 2 | 2.08 | 2.22 | 2.37 | 2.51 | 2.72 | 3.06 | 3.39 | 3.7 | 4 | 4.29 | 4.57 | 4.83 | 5.09 | 5.33 |
| 38 | 2.19 | 2.27 | 2.43 | 2.59 | 2.75 | 2.98 | 3.35 | 3.72 | 4.07 | 4.41 | 4.74 | 5.05 | 5.35 | 5.64 | 5.92 |
| 40* | 2.31 | 2.4 | 2.57 | 2.74 | 2.9 | 3.15 | 3.55 | 3.94 | 4.32 | 4.68 | 5.03 | 5.37 | 5.7 | 6.01 | 6.31 |
| 42 | 2.44 | 2.53 | 2.71 | 2.89 | 3.06 | 3.32 | 3.75 | 4.16 | 4.56 | 4.95 | 5.33 | 5.69 | 6.01 | 6.38 | 6.71 |
| 42.4* | 2.46 | 2.55 | 2.73 | 2.91 | 3.09 | 3.36 | 3.79 | 4.2 | 4.61 | 5 | 5.38 | 5.75 | 6.11 | 6.45 | 6.79 |
| 44.5* | 2.59 | 2.69 | 2.88 | 3.07 | 3.26 | 3.54 | 4 | 4.44 | 4.87 | 5.29 | 5.7 | 6.09 | 6.47 | 6.84 | 7.2 |
| 45 | 2.62 | 2.72 | 2.91 | 3.11 | 3.3 | 3.58 | 4.04 | 4.49 | 4.93 | 5.36 | 5.77 | 6.17 | 6.56 | 6.94 | 7.3 |
| 48.3* | 2.82 | 2.93 | 3.14 | 3.35 | 3.58 | 3.87 | 4.37 | 4.86 | 5.34 | 5.8 | 6.26 | 6.7 | 7.13 | 7.54 | 7.95 |
| 50 | 2.93 | 3.04 | 3.26 | 3.48 | 3.69 | 4.01 | 4.54 | 5.05 | 5.55 | 6.04 | 6.51 | 6.97 | 7.42 | 7.86 | 8.29 |
| 51* | – | – | – | 3.55 | 3.77 | 4.1 | 4.64 | 5.16 | 5.67 | 6.17 | 6.65 | 7.13 | 7.6 | 8.04 | 8.48 |
| 54 | – | – | – | 3.77 | 4.01 | 4.36 | 4.93 | 5.49 | 6.04 | 6.58 | 7.1 | 7.61 | 8.11 | 8.6 | 9.08 |
| 57 | – | – | – | 4 | 4.25 | 4.62 | 5.23 | 5.83 | 6.41 | 6.99 | 7.55 | 8.1 | 8.63 | 9.16 | 9.67 |
| 60* | – | – | – | 4.22 | 4.48 | 4.88 | 5.52 | 6.16 | 6.78 | 7.39 | 7.99 | 8.58 | 9.15 | 9.71 | 10.26 |
| 60.3* | – | – | – | 4.24 | 4.5 | 4.9 | 5.55 | 6.19 | 6.82 | 7.43 | 8.03 | 8.62 | 9.2 | 9.76 | 10.32 |
| 63.5 | – | – | – | 4.48 | 4.76 | 5.18 | 5.87 | 6.55 | 7.21 | 7.87 | 8.51 | 9.14 | 9.75 | 10.36 | 10.95 |
| 68 | – | – | – | 4.81 | 5.11 | 5.57 | 6.31 | 7.05 | 7.77 | 8.48 | 9.17 | 9.86 | 10.53 | 11.19 | 11.84 |
| 70 | – | – | – | 4.96 | 5.27 | 5.74 | 6.51 | 7.27 | 8.02 | 8.75 | 9.47 | 10.18 | 10.88 | 11.56 | 12.23 |
| 73 | – | – | – | 5.18 | 5.51 | 6 | 6.81 | 7.6 | 8.39 | 9.16 | 9.91 | 10.66 | 11.39 | 12.12 | 12.82 |
| 76 | – | – | – | 5.4 | 5.74 | 6.26 | 7.1 | 7.94 | 8.76 | 9.56 | 10.36 | 11.14 | 11.91 | 12.67 | 13.42 |
| 82.5* | – | – | – | – | – | 6.82 | 7.74 | 8.66 | 9.56 | 10.44 | 11.32 | 12.18 | 13.03 | 13.87 | 14.7 |
| 83 | – | – | – | – | – | 6.86 | 7.79 | 8.71 | 9.62 | 10.51 | 11.39 | 12.26 | 13.12 | 13.96 | 14.8 |
| 89 | – | – | – | – | – | 7.38 | 8.39 | 9.38 | 10.36 | 11.33 | 12.28 | 13.23 | 14.16 | 15.07 | 15.98 |
| 95 | – | – | – | – | – | 7.9 | 8.98 | 10.04 | 11.1 | 12.14 | 13.17 | 14.19 | 15.19 | 16.18 | 17.16 |
| 102 | – | – | – | – | – | 8.5 | 9.67 | 10.82 | 11.96 | 13.09 | 14.21 | 15.31 | 16.4 | 17.48 | 18.55 |
| 104* | – | – | – | – | – | – | 9.86 | 11.04 | 12.21 | 13.36 | 14.5 | 15.63 | 16.74 | 17.85 | 18.94 |
| 108 | – | – | – | – | – | – | 10.26 | 11.49 | 12.7 | 13.9 | 15.09 | 16.27 | 17.44 | 18.59 | 19.73 |
| 114 | – | – | – | – | – | – | 10.85 | 12.15 | 13.44 | 14.72 | 15.98 | 17.23 | 18.47 | 19.7 | 20.91 |
| 121 | – | – | – | – | – | – | 11.54 | 12.93 | 14.3 | 15.67 | 17.02 | 18.35 | 19.68 | 20.99 | 22.29 |
| 127 | – | – | – | – | – | – | 12.13 | 13.6 | 15.04 | 16.48 | 17.9 | 19.32 | 20.72 | 22.1 | 23.48 |
| 133 | – | – | – | – | – | – | 12.73 | 14.26 | 15.78 | 17.29 | 18.79 | 20.28 | 21.75 | 23.21 | 24.66 |
| 140 | – | – | – | – | – | – | – | 15.04 | 16.55 | 18.24 | 19.83 | 21.4 | 22.96 | 24.51 | 26.04 |
| 146 | – | – | – | – | – | – | – | 15.7 | 17.39 | 19.06 | 20.72 | 22.36 | 24 | 25.62 | 27.23 |
| 152 | – | – | – | – | – | – | – | 16.37 | 18.13 | 19.87 | 21.6 | 23.32 | 25.03 | 26.73 | 28.41 |
| 159 | – | – | – | – | – | – | – | 17.15 | 18.99 | 20.82 | 22.64 | 24.45 | 26.24 | 28.02 | 29.79 |
| 165* | – | – | – | – | – | – | – | – | 19.73 | 21.63 | 23.53 | 25.41 | 27.28 | 29.13 | 30.97 |
| 168 | – | – | – | – | – | – | – | – | 20.1 | 22.04 | 23.97 | 25.89 | 27.79 | 29.69 | 31.57 |
| 178* | – | – | – | – | – | – | – | – | 21.33 | 23.4 | 25.45 | 27.49 | 29.52 | 31.53 | 33.54 |
| 180 | – | – | – | – | – | – | – | – | 21.58 | 23.67 | 25.75 | 27.81 | 29.87 | 31.91 | 33.93 |
| 194 | – | – | – | – | – | – | – | – | 23.31 | 25.57 | 27.82 | 30.06 | 32.28 | 34.5 | 36.7 |
| 203 | – | – | – | – | – | – | – | – | – | – | 29.15 | 31.5 | 33.84 | 36.16 | 38.47 |
| 219 | – | – | – | – | – | – | – | – | – | – | 31.52 | 34.06 | 36.6 | 39.12 | 41.63 |
| 245 | – | – | – | – | – | – | – | – | – | – | – | 38.23 | 41.09 | 43.93 | 46.76 |
| 273 | – | – | – | – | – | – | – | – | – | – | – | 42.72 | 45.92 | 49.11 | 52.28 |
| 299 | – | – | – | – | – | – | – | – | – | – | – | – | 53.92 | 57.41 | 62.34 |
| 324* | – | – | – | – | – | – | – | – | – | – | – | – | – | 58.54 | 62.34 |
| 325 | – | – | – | – | – | – | – | – | – | – | – | – | – | 58.73 | 62.54 |
| 351 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 67.67 |
| 356* | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 68.66 |
| 377 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – |
