GOST 31447-2012 Welded Steel Pipe
GOST 31447 Steel Pipe Manufacturer
Huayang Steel Pipe manufactures GOST 31447 welded steel pipes for trunk gas pipelines, oil pipelines, and petroleum product transportation systems. Combining advanced High Frequency Welding (HFW) and Double-Sided Submerged Arc Welding (LSAW) technologies, Huayang provides reliable line pipe solutions for long-distance energy transmission projects.
GOST 31447-2012 specifies technical requirements for welded steel pipes used in main gas pipelines, oil pipelines, and petroleum product pipelines. The standard defines requirements for steel grades, chemical composition, mechanical properties, welding quality, dimensional accuracy, non-destructive testing, and acceptance criteria.
With strong manufacturing capabilities and complete anti-corrosion processing facilities, Huayang supplies GOST 31447 steel pipes for oil and gas infrastructure projects in Russia, CIS countries, and global markets.
GOST 31447 Steel Pipe Product Range
Based on Huayang manufacturing capability.
| Product Type | Manufacturing Process | Outside Diameter | Wall Thickness | Length |
|---|---|---|---|---|
| GOST 31447 HFW Steel Pipe | High Frequency Welding | Φ114–Φ660.4 mm | 3.0–22 mm | 6–27 m |
| GOST 31447 LSAW Steel Pipe | Double-Sided SAW | Φ406.4–Φ1420 mm | 7–50 mm | 6–12.5 m |
GOST 31447 Steel Pipe Specification
| Item | Specification |
|---|---|
| Standard | GOST 31447-2012 |
| Product Type | Welded Line Pipe |
| Manufacturing Process | HFW / LSAW |
| Application | Gas Pipeline, Oil Pipeline, Petroleum Product Pipeline |
| Outside Diameter | Φ114–Φ1420 mm |
| Wall Thickness | 3.0–50 mm |
| Length | 6–27 m or Customized |
| Pipe End | Plain End / Beveled End |
| Surface Treatment | Black / Coated |
GOST 31447 Steel Grades
GOST 31447 uses strength classes for pipeline steel.
| Strength Class | Typical Equivalent | Application |
|---|---|---|
| K34 | API 5L B Equivalent | General Pipeline |
| K38 | API 5L X42 Equivalent | Gas Transmission |
| K42 | API 5L X46 Equivalent | Oil Pipeline |
| K48 | API 5L X52 Equivalent | Long Distance Pipeline |
| K50 | API 5L X56 Equivalent | High Pressure Pipeline |
| K52 | API 5L X60 Equivalent | Energy Transmission |
| K54 | API 5L X65 Equivalent | High Strength Pipeline |
| K55 | High Strength Steel | Critical Pipeline |
| K60 | API 5L X70 Equivalent | High Pressure Transmission |
Equivalent grades are for reference only. Final material selection depends on project requirements.
Manufacturing Process
Huayang uses advanced welding technologies to manufacture GOST 31447 steel pipes.
| Production Step | Description |
|---|---|
| Raw Material Inspection | Chemical and Mechanical Verification |
| Plate / Coil Preparation | Surface and Edge Processing |
| Forming | HFW or JCOE Forming |
| Welding | Longitudinal High Frequency or SAW Welding |
| Expansion | Mechanical Expansion When Required |
| Weld Inspection | Full Weld Examination |
| Final Inspection | Complete Quality Control |
Chemical Requirements
Chemical composition depends on selected strength class.
Typical requirements:
| Element | Requirement |
|---|---|
| Carbon | Controlled for strength and weldability |
| Manganese | Controlled according to steel grade |
| Silicon | Controlled |
| Phosphorus | Low Content |
| Sulfur | Low Content |
| Carbon Equivalent | Controlled |
Low carbon equivalent improves welding performance and pipeline reliability.
Mechanical Requirements
| Property | Requirement |
|---|---|
| Yield Strength | According to Strength Class |
| Tensile Strength | According to Strength Class |
| Elongation | According to Standard Requirements |
| Weld Strength | Equal to Base Metal Requirements |
| Impact Toughness | According to Project Specification |
GOST 31447 Technical Requirements
| Requirement | Description |
|---|---|
| Manufacturing Type | Longitudinal Welded / Spiral Welded |
| Application | Main Gas, Oil and Product Pipelines |
| Working Pressure | Up to 9.8 MPa |
| Service Temperature | Down to -60℃ |
| Weld Quality | High Reliability Weld Seam |
| Traceability | Complete Production Records |
| Surface Quality | No Harmful Defects |
Size and Manufacturing Process Table
| Manufacturing Process | Diameter Range | Wall Thickness | Typical Application |
|---|---|---|---|
| HFW | Φ114–Φ660.4 mm | 3–22 mm | Gas Distribution and Transmission |
| LSAW | Φ406.4–Φ1420 mm | 7–50 mm | Main Oil and Gas Pipeline |
Inspection and Testing
Huayang performs strict inspection according to pipeline project requirements.
| Inspection Item | Test Method |
|---|---|
| Chemical Analysis | Spectrometer |
| Tensile Test | Mechanical Testing |
| Impact Test | Charpy V-Notch Test |
| Hydrostatic Test | Hydraulic Pressure Test |
| Ultrasonic Testing | UT |
| Radiographic Testing | RT When Required |
| Weld Inspection | Full Weld Examination |
| Dimensional Inspection | Diameter, Thickness, Length |
| Surface Inspection | Visual Examination |
Anti-Corrosion and Processing Services
Huayang provides integrated pipeline processing services.
| Service | Capability |
|---|---|
| FBE Coating | Available |
| 2PE Coating | Available |
| 3PE Coating | Available |
| 2PP Coating | Available |
| 3PP Coating | Available |
| Internal Epoxy Coating | Available |
| Pipe Cutting | Available |
| Beveling | Available |
| Hydrostatic Testing | Available |
Anti-Corrosion Processing Capacity
| Item | Production Range |
|---|---|
| Outside Diameter | Φ159–Φ1626 mm |
| Wall Thickness | 4–40 mm |
| Length | 8–16 m |
Applications of GOST 31447 Steel Pipe
GOST 31447 welded steel pipes are widely used in:
- Natural gas transmission pipelines
- Crude oil transportation pipelines
- Petroleum product pipelines
- Long-distance energy pipelines
- Compressor station pipelines
- Pumping station systems
- Petrochemical infrastructure
- Water transmission projects
The combination of high strength, reliable weld performance, and strict inspection requirements makes GOST 31447 steel pipe suitable for critical pipeline systems.
GOST 31447 vs API 5L
| Item | GOST 31447 | API 5L |
|---|---|---|
| Main Market | Russia & CIS | Global |
| Application | Oil & Gas Transmission | Oil & Gas Transmission |
| Product Type | Welded Line Pipe | Line Pipe |
| Manufacturing | HFW / LSAW / Spiral Welded | HFW / LSAW / Seamless |
| Strength Classification | K34–K60 | B–X80 |
| Inspection | Strict Pipeline Inspection | PSL1 / PSL2 |
Why Choose Huayang GOST 31447 Steel Pipe
| Advantage | Description |
|---|---|
| Standard | GOST 31447-2012 |
| Product Type | Welded Line Pipe |
| Manufacturing Process | HFW & LSAW |
| Diameter Range | Φ114–Φ1420 mm |
| Wall Thickness | 3–50 mm |
| Steel Grade | K34–K60 |
| Testing | UT, RT, Hydrostatic Test |
| Coating | 3PE, FBE, Internal Epoxy |
| Custom Production | Available |