GOST 20295: Welded Steel Pipes for Oil and Gas Pipelines

1. Scope  

- Applies to electric-resistance welded (ERW) and submerged arc welded (SAW) steel pipes used in main oil & gas pipelines, including those for sour service (H₂S-containing environments).  

 2. 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.)  

 3. 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              |  

 4. Chemical Composition  

- Limits for C, Mn, Si, S, P, Nb, V, Ti, and other microalloying elements.  

- Carbon Equivalent (CE) is restricted for weldability.  

 5. 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).  

 6. 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.  

 7. 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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