ALLLAND Boiler Steel Pipe Supply
Welcome to ALLLAND! We specialize in the production of hot-rolled seamless steel pipes in compliance with GOST 8732 standards. Our product range covers a wide variety of specifications, with a full range of outer diameters and wall thicknesses, capable of meeting diverse application requirements such as oil and gas transportation, structural engineering, machining, and high-pressure applications. We select high-quality carbon steel and low-alloy steel materials and organize production in strict accordance with GOST 8732 and GOST 8731 standards to ensure that the strength, toughness, and dimensional accuracy of our steel pipes meet these standards. Additionally, ALLLAND offers customized services, including custom lengths, surface treatments, and end processing, and is committed to providing high-quality, cost-effective seamless steel pipe solutions to customers worldwide.
Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience.
The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines.
With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!
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GOST 8732 is a national standard for hot-rolled seamless steel pipes established by the former Soviet Union, which specifies technical requirements for the dimensional range, wall thickness tolerances, length, and cross-sectional shape of hot-rolled seamless steel pipes. Its full name is:
GOST 8732-78: Hot-rolled seamless steel pipes. It primarily specifies the dimensional standards and tolerances for hot-rolled seamless pipes. This standard is widely used in structural and mechanical applications, such as in the petroleum, machinery manufacturing, construction, and boiler manufacturing industries. The standard imposes strict dimensional requirements and must be used in conjunction with GOST 8731 during production.
O.D.:
20 mm to 550 mm; small-diameter precision tubes: as small as 10 mm.
W.T.:
2.5 mm to 75 mm, offering a wider range than ASTM A106
Length:
Fixed or random lengths: 4–12 m; customizable
Process:
Hot-rolled seamless (Hot Deformed)
Technical Standards:
GOST 8732 (Dimensions) + GOST 8731 (Properties)
Steel Grades:
10, 20 (low-carbon steel)/35, 45 (medium-carbon steel)/40X (alloy structural steel)/09G2S (low-alloy high-strength steel)
Tube Ends:
Plain End / Beveled End (30°) / Specially Finished Ends (per customer requirements)
Surface Treatment:
Black surface / Hot-rolled scale
Formula for the theoretical weight of steel pipes: Weight (kg/m) = (OD – WT) × WT × 0.02466
| OD (mm) | WT (mm) | Weight(kg/m) |
| 21.3 | 2.5 | 1.27 |
| 21.3 | 3 | 1.48 |
| 26.9 | 2.5 | 1.63 |
| 26.9 | 3 | 1.92 |
| 33.7 | 3 | 2.42 |
| 33.7 | 4 | 3.16 |
| 42.4 | 3 | 3.05 |
| 42.4 | 4 | 4.07 |
| 48.3 | 3.5 | 3.84 |
| 48.3 | 5 | 5.44 |
| 60.3 | 3.5 | 4.92 |
| 60.3 | 5 | 6.92 |
| 76.1 | 4 | 7.03 |
| 76.1 | 6 | 10.35 |
| 89 | 4.5 | 9.46 |
| 89 | 6 | 12.52 |
| 114.3 | 4.5 | 12.21 |
| 114.3 | 6 | 16.07 |
| 139.7 | 6 | 19.5 |
| 139.7 | 8 | 25.6 |
| 168.3 | 6 | 23.7 |
| 168.3 | 10 | 38.7 |
| 219.1 | 6 | 31.5 |
| 219.1 | 10 | 51.2 |
| 273 | 8 | 52.3 |
| 273 | 12 | 77 |
| 325 | 10 | 79.7 |
| 325 | 14 | 110 |
| 377 | 10 | 92.8 |
| 377 | 16 | 146 |
| 426 | 12 | 123 |
| 426 | 20 | 202 |
| 508 | 16 | 194 |
| 508 | 25 | 300 |
| Item | Normal accuracy | High accuracy | |
| Outside Diameter | ≤50mm | ±0.5 mm | ±0.4 mm |
| 50–219mm | ±1.0% | ±0.8% | |
| ＞219mm | ±1.25% | ±1.0% | |
| Wall Thickness | ≤ 20mm | ±12.5% | ±10% |
| > 20 | ±12.5% | ±8% | |
| Length | Cut to length | +10 mm | +10 mm |
| Straightness | ≤ 1.5 mm per meter | ≤ 1.0 mm per meter |
For total length deflection, the standard specifies that the total deflection—calculated by multiplying the deflection per meter by the total length—shall not exceed 0.15% × total length (for standard accuracy).
GOST 8732 does not specify steel grades on its own; it is typically applied in conjunction with the following standards:
| Grade | Type |
| 10 | Low-carbon steel |
| 20 | High-quality carbon steel |
| 35 | Medium-carbon steel |
| 45 | Medium-high-carbon steel |
20 steel pipe is the most widely used grade under GOST 8732, equivalent to China’s 20# steel and the U.S. ASTM A106 Gr. B , with similar chemical compositions but slight differences in mechanical property classifications. A106 is primarily used for pressure piping, with a tensile strength of ≥ 415 MPa and an elongation of ≥ 20%; 20 steel has a tensile strength of 410–550 MPa and an elongation of ≥ 24%.
| Grade | Type |
| 09G2S | Low-alloy steel |
| 17G1S | High-strength steel |
| 10GS | Alloy steel |
09G2S is a representative grade of low-alloy high-strength steel in the GOST 8732 system and is a distinctive Russian grade.
Equivalence: Equivalent to China’s Q345B or 16Mn, and Europe’s S355J2H.
Example: 09G2S
09 → Carbon content of approximately 0.09%
G → Contains manganese (Mn)
2 → Manganese content grade
S → Contains silicon (Si)
Hot-rolled seamless steel pipes manufactured in accordance with GOST 8732 must undergo the following tests to ensure that they meet all performance requirements.
GOST 8732 Chemical Analysis
Verifies whether the steel grade of the steel pipe complies with the requirements of GOST 8732 for carbon or low-alloy steel.
Lattening/Bending/Forming Test
One of the most critical performance tests for seamless pipes, verifying whether cracks appear in the pipe wall when the pipe is flattened to a specified distance.
GOST 8732 Dimensional & Visual Inspection
Dimensions must be within tolerance limits, and the surface must be free of defects such as cracks, folds, and delamination.
GOST 8732 End Inspection
Inspects the flatness of the tube ends (Square / Beveled End).
GOST 8732 Tensile Test
Standard test specimens (round bars or pipe sections) are prepared in accordance with GOST 1497 to determine the pipe’s tensile strength, yield strength, and elongation.
Impact Test/KV Test
Uses the Charpy V-notch (CVN) test method to evaluate the steel pipe’s low-temperature toughness and prevent brittle fracture.
GOST 8732 also specifies requirements for the marking of steel pipes, primarily referencing the supporting standard GOST 8731. This ensures that steel pipes are traceable upon shipment and that their quality complies with the standard.
General Marking Requirements
1. Manufacturer name / trademark
2. Standard number GOST 8732
3. Steel grade
4. Dimensional information
5. Heat number / Batch number
There are three common marking methods: Paint Marking / Stamping / Tag / Label
GOST 8732 steel pipes offer high strength and good machinability. With no weld seams, their pressure resistance is significantly higher than that of welded steel pipes with the same wall thickness. They have a wide range of applications and can operate under extreme conditions, including high temperature and high pressure, as well as low temperatures.
They are indispensable base materials in heavy industrial sectors such as petroleum, energy, chemical, and machinery manufacturing.
GOST 8732 is a standard for hot-rolled seamless steel pipes centered on dimensional specifications. It is characterized by a wide range of sizes, low cost, and high versatility, making it a fundamental standard for entering the Russian and CIS markets.
With over 20 years of professional manufacturing and export experience, ALLLAND STEEL PIPE Co., Ltd. produces steel pipes that comply with the GOST 8732 standard while strictly controlling quality.
Crafted with precision, shaping the future—we are dedicated to serving every customer with care.
