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GOST 20295: Welded Steel Pipes for Oil and Gas Pipelines
Ordering Information
When ordering pipes per GOST 20295, the following must be specified:
- Pipe dimensions (outer diameter, wall thickness, length)
- Steel grade (e.g., K48, K52, K60, etc.)
- Manufacturing method (ERW or SAW)
- Delivery condition (normalized, thermally improved, etc.)
- Additional requirements (impact testing, HIC resistance, etc.)
Main Steel Grades & Mechanical Properties
| Steel Grade | Yield Strength (MPa, min) | Tensile Strength (MPa) | Elongation (%) |
| K42 | ≥ 420 | 520–640 | ≥ 24 |
| K48 | ≥ 480 | 570–710 | ≥ 22 |
| K52 | ≥ 520 | 610–760 | ≥ 20 |
| K60 | ≥ 600 | 690–830 | ≥ 18 |
Chemical Composition
- Limits for C, Mn, Si, S, P, Nb, V, Ti, and other microalloying elements.
- Carbon Equivalent (CE) is restricted for weldability.
Inspection & Testing Requirements
- Non-destructive testing (NDT):
- 100% ultrasonic testing (UT) for weld seams.
- Eddy current or radiographic testing (if specified).
- Mechanical tests:
- Tensile, impact (Charpy V-notch at –20°C or –40°C), hardness.
- Hydrostatic testing:
- Mandatory for all pipes (test pressure calculated per standard).
- HIC/SSC testing (for sour service applications).
Marking & Certification
- Pipes must be marked with:
- Manufacturer’s name, steel grade, size, heat number, and GOST 20295 compliance.
- Certification: Mill Test Certificate (MTC) with chemical/mechanical test results.
Additional Requirements
- Dimensional tolerances (OD, wall thickness, straightness).
- Surface quality (no cracks, laps, or unacceptable defects).
- End preparation (beveled ends if required for welding).
Key Revisions in Latest Version
- Stricter Sulfur (S) and Phosphorus (P) limits for improved toughness.
- Updated NDT methods (enhanced UT sensitivity requirements).
- Expanded steel grades for high-pressure applications.
Applicable Replacements & Related Standards
- ISO 3183 (international equivalent for pipeline pipes).
- API 5L (similar scope but differs in some technical requirements).
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