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CE Certification GOST 8732 Seamless Hot-deformed Steel Pipes Factory, Factories
CE Certification GOST 8732 Seamless Hot-deformed Steel Pipes Factory, Factories
CE Certification GOST 8732 Seamless Hot-deformed Steel Pipes Factory, Factories
CE Certification GOST 8732 Seamless Hot-deformed Steel Pipes Factory, Factories
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CE Certification GOST 8732 Seamless Hot-deformed Steel Pipes Factory, Factories
CE Certification GOST 8732 Seamless Hot-deformed Steel Pipes Factory, Factories
CE Certification GOST 8732 Seamless Hot-deformed Steel Pipes Factory, Factories
CE Certification GOST 8732 Seamless Hot-deformed Steel Pipes Factory, Factories

CE Certification GOST 8732 Seamless Hot-deformed Steel Pipes Factory, Factories

Scope  
- Applies to seamless hot-deformed steel pipes with diameters ≥ 20 mm and wall thicknesses ≥ 2.5 mm.  
- Used in pressure systems, structural applications, and high-temperature services (unless otherwise specified).

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Product Description

Ordering Information

Buyers must specify the following requirements:

  • Pipe dimensions (outer diameter, wall thickness, length).
  • Steel grade (e.g., carbon steels per GOST 380, alloy steels per GOST 4543).
  • Manufacturing accuracy (normal or increased precision).
  • End condition (plain, beveled, or threaded).
  • Additional requirements (heat treatment, hydrostatic testing, non-destructive testing).

Material and Manufacturing Requirements

  • Steel Grades: Carbon steels 10, 20, 35, 45 (GOST 1050) and Alloy steels 15XM, 12X1MF (GOST 4543).
  • Heat Treatment: Normalization, annealing, or tempering as required for mechanical properties.
  • Surface Quality: Free from cracks, laps, and scale; minor defects allowed within thickness tolerances.
GOST-8732 Seamless Hot-deformed Steel Pipes
GOST-8732 Steel Pipes Manufacturing

Dimensional Tolerances

  • Outer Diameter: ±1.0–1.5% (varies by pipe size).
  • Wall Thickness: ±10–15% (depends on manufacturing precision).
  • Random Length: 4–12.5 m.
  • Fixed Length: ±100 mm tolerance.

Test Requirements

Mandatory Tests

  • Hydrostatic pressure test
  • Tensile test for properties
  • Flattening test (ductility)
  • Bend test (≤ 10 mm wall)

Optional Tests

  • Impact testing
  • Ultrasonic testing (UT)
  • Eddy current testing (ET)
  • Chemical analysis
Steel Pipe Testing and Inspection
Seamless Steel Pipe Storage

Steel Grades: GOST 380 & GOST 4543

Standard Steel Type Example Grades Key Applications
GOST 380 Carbon (ordinary) Ст3сп, Ст5сп Construction, pipes, welding.
GOST 4543 Alloy structural 20Х, 40Х, 12Х1МФ Machinery, boilers, high-stress parts.

Marking, Packaging & Storage

  • Marking: Each pipe includes trademark, steel grade, heat number, and GOST 8732 standard designation.
  • Certification: Full conformance certificates including test results and heat treatment data.
  • Packaging: Bundled or crated with anti-corrosion protection (oiling/coating) for storage.

Frequently Asked Questions (FAQ)

What information is required to place an order for GOST 8732 pipes?
When ordering, you must specify the pipe dimensions (diameter, wall thickness, length), steel grade, manufacturing accuracy, end conditions, and any additional testing requirements like hydrostatic or ultrasonic testing.
What are the common steel grades defined by GOST 380 and GOST 4543?
GOST 380 includes carbon steels like Ст3сп (general construction), while GOST 4543 covers alloy structural steels such as 20Х, 40Х, and 12Х1МФ, used for machinery and high-stress components.
What mandatory tests are performed on these steel pipes?
Mandatory tests include the hydrostatic pressure test, tensile test for mechanical properties, flattening test for ductility, and bend tests for pipes with a wall thickness of 10 mm or less.
What do the suffixes "сп", "пс", and "кп" mean in GOST 380?
These denote the deoxidation level: "сп" (calm/fully deoxidized) is best for welding, "пс" (semi-calm) is intermediate, and "кп" (boiling/rimmed) has higher oxygen content.
Are there specific tolerances for pipe dimensions?
Yes, outer diameters typically have a tolerance of ±1.0–1.5%, while wall thickness tolerances range from ±10–15% depending on the manufacturing precision specified.
How are the pipes protected for long-term storage?
Pipes are usually bundled or crated to prevent physical damage and treated with anti-corrosion protection, such as oiling or specialized coatings, to ensure durability during storage.

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