GB/T 19830 T95 Seamless Steel Tube Steel Pipes Casing For Petroleum And Natural Gas
GB/T 19830 H40 J55 K55 N80 N80 Seamless Steel Tube Steel Pipes Casing For Petroleum And Natural Gas
Material
The GB/T 19830 standard specifies the requirements for seamless steel tubes used as casing in petroleum and natural gas industries. The materials used for these pipes are designed to withstand high pressures and corrosive environments typically found in oil and gas extraction.
Specification
The specifications for the seamless steel tubes under the GB/T 19830 standard include various grades such as H40, J55, K55, N80, and N80Q. Each grade has specific requirements regarding dimensions, tolerances, and mechanical properties.
Specification Overview
| Grade | Outer Diameter (mm) | Wall Thickness (mm) | Length (m) |
|---|---|---|---|
| H40 | 114.3 - 508.0 | 5.0 - 20.0 | 6 - 12 |
| J55 | 114.3 - 508.0 | 5.0 - 20.0 | 6 - 12 |
| K55 | 114.3 - 508.0 | 5.0 - 20.0 | 6 - 12 |
| N80 | 114.3 - 508.0 | 5.0 - 20.0 | 6 - 12 |
| N80Q | 114.3 - 508.0 | 5.0 - 20.0 | 6 - 12 |
Chemical Composition
The chemical composition of the steel grades is crucial for ensuring the pipes can withstand the harsh conditions of oil and gas extraction. Below is a summary of the typical chemical composition for each grade.
Chemical Composition
| Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cr (%) | Ni (%) | Mo (%) |
|---|---|---|---|---|---|---|---|---|
| H40 | ≤0.26 | ≤0.55 | 0.40-0.90 | ≤0.030 | ≤0.030 | ≤0.15 | ≤0.15 | - |
| J55 | ≤0.26 | ≤0.55 | 0.40-0.90 | ≤0.030 | ≤0.030 | ≤0.15 | ≤0.15 | - |
| K55 | ≤0.26 | ≤0.55 | 0.40-0.90 | ≤0.030 | ≤0.030 | ≤0.15 | ≤0.15 | - |
| N80 | ≤0.30 | ≤0.55 | 0.40-0.90 | ≤0.030 | ≤0.030 | ≤0.15 | ≤0.15 | - |
| N80Q | ≤0.30 | ≤0.55 | 0.40-0.90 | ≤0.030 | ≤0.030 | ≤0.15 | ≤0.15 | - |
Mechanical Properties
The mechanical properties of the seamless steel tubes are essential for ensuring their performance under operational conditions. The following table summarizes the key mechanical properties for each grade.
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| H40 | ≥ 241 | 414 - 552 | ≥ 20 |
| J55 | ≥ 379 | 517 - 655 | ≥ 20 |
| K55 | ≥ 379 | 517 - 655 | ≥ 20 |
| N80 | ≥ 517 | 620 - 758 | ≥ 18 |
| N80Q | ≥ 517 | 620 - 758 | ≥ 18 |
Application
The seamless steel tubes specified in GB/T 19830 are primarily used in the oil and gas industry for casing applications. These pipes are essential for:
- Well Construction: Providing structural integrity to oil and gas wells.
- Pressure Containment: Withstanding high pressures encountered during extraction.
- Corrosion Resistance: Protecting against corrosive environments found in subsurface conditions.
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