Views: 3 Author: Site Editor Publish Time: 2025-12-11 Origin: Site
GOST 8732-78 defines the specifications for hot-worked carbon seamless steel pipes widely used across industrial applications. This standard covers pipes manufactured based on outside diameter, wall thickness, and length, ensuring reliable performance under demanding operating conditions.
Details of GOST 8732-78 steel pipe
GOST 8732-78 seamless steel pipes are produced through a hot-working manufacturing process, resulting in a completely seamless structure with enhanced strength and uniformity.
Dimensional Range
Outer Diameter: 10–426 mm
Wall Thickness: 1–40 mm
Length: Random or fixed lengths according to customer requirements.
Chemical Composition
C (%) | Si (%) | Mn (%) | Cr (%) | Ni (%) | S (%) | P (%) | Cu (%) |
0.07–0.14 | 0.17–0.37 | 0.35–0.65 | ≤0.15 | ≤0.30 | ≤0.040 | ≤0.035 | ≤0.30 |
Mechanical Properties
Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
≥353 | ≥216 | ≥24 |
Outside Diameter Tolerances
Outside Diameter (mm) | Tolerance |
32–50 | ±0.5 mm |
51–219 | ±1% |
Wall Thickness Tolerances
Wall Thickness (mm) | Tolerance (%) |
3–15 | +12.5 / –15 |
16–30 | ±12.5 |
32–45 | +10 / –12.5 |
Application of GOST 8732-78 Seamless Steel Pipes
Thanks to their excellent mechanical strength, stable performance at low temperatures, and reliability under high pressure, GOST 8732-78 carbon seamless steel pipes are widely used in the following industries:
1. Oil & Gas: Pipelines transporting oil and natural gas under high-pressure or extreme-temperature conditions.
2. Power Generation: High-pressure steam pipes for power plants, boilers, and thermal systems.
3. Cryogenic Engineering: Suitable for low-temperature environments due to excellent toughness (especially 09G2S-grade alloys).
4. Chemical Processing: Used in chemical reactors, corrosive pipelines, and high-pressure processing systems.
5. Pressure Vessels: Ideal for tanks and vessels designed to store or transport pressurized gases and liquids.
6. Structural & Mechanical Engineering: Applied in machinery manufacturing and structural components requiring high strength and reliability.
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