TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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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.
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.
| 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 |
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.
| 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 | - |
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.
| 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 |
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:
A: manufacturer,also can do trading.
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
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