GOST 8732-78 Seamless Steel Pipes Hot Deformed For General Purposes
GOST 8732-78 Seamless Steel Pipes Hot Deformed For General Purposes
Material
GOST 8732-78 seamless steel pipes are hot-deformed seamless steel tubes manufactured for general-purpose service. In the GOST system, GOST 8732-78 mainly defines the size range, while the technical requirements, steel grades, inspection, and test rules are coordinated with GOST 8731. Common steels used for this product family include carbon grades such as 10, 20, 35, and 45, as well as selected alloy or low-alloy grades depending on service conditions.
Specifications
Typical GOST 8732-78 supply is based on outside diameter, wall thickness, and length. Common dimensional coverage is OD 25-820 mm, wall thickness 2.5-75 mm, and length 4.0-12.5 m, subject to mill capability and procurement agreement. Standard commercial supply often concentrates on the more practical production window used by mills.
Main Features
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Seamless hot-deformed construction for reliable pressure resistance and structural integrity.
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Broad dimensional range suitable for fluid transfer, structural fabrication, and mechanical processing.
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Flexible steel-grade selection from low-carbon machinable grades to higher-strength carbon and alloy steels.
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Good adaptability for cutting, machining, welding, and secondary fabrication, depending on grade selection.
Our Advantages
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Stable compliance with the GOST system
Many buyers worry whether the supplier is quoting only a size standard or a complete technical package. We supply according to GOST 8732-78 for dimensions together with the corresponding GOST 8731 technical requirements, which helps avoid confusion over grade selection, inspection items, and delivery condition. -
Wider grade matching for different service demands
Buyers often ask whether one pipe family can cover general fabrication, pressure duty, and machined components. The GOST technical route allows multiple steel grades, including St-series steels, grades 10/20/35/45 under GOST 1050, and alloy grades under GOST 4543, so the material can be matched more accurately to strength, weldability, and processing needs. -
Easier cross-standard sourcing for export projects
Another common concern is whether GOST material can be aligned with ASTM, EN, JIS, or GB projects. We help purchasers compare the service intent of the pipe with nearby international standards for pressure service, liquid service, or elevated-temperature duty, reducing sourcing risk in multinational projects.
Chemical Composition
| Grade | Reference Standard | C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
|---|---|---|---|---|---|---|---|---|---|---|
| 10 | GOST 1050 | 0.07-0.14 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.040 | ≤0.15 | ≤0.30 | ≤0.30 | — |
| 20 | GOST 1050 | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.040 | ≤0.25 | ≤0.30 | ≤0.30 | — |
| 35 | GOST 1050 | 0.32-0.40 | 0.17-0.37 | 0.50-0.80 | ≤0.035 | ≤0.040 | ≤0.25 | ≤0.30 | ≤0.30 | — |
| 45 | GOST 1050 | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | ≤0.035 | ≤0.040 | ≤0.25 | ≤0.30 | ≤0.30 | — |
| 30KhMA | GOST 4543 | 0.26-0.33 | 0.17-0.37 | 0.40-0.70 | ≤0.025 | ≤0.025 | 0.80-1.10 | ≤0.30 | ≤0.30 | 0.15-0.25 |
Mechanical Properties
| Grade | Reference Standard / Condition | Tensile Strength, MPa | Yield Strength, MPa | Elongation, % | Reduction of Area, % |
|---|---|---|---|---|---|
| 10 | GOST 1050, rolled product | ≥330 | ≥205 | ≥31 | ≥55 |
| 20 | GOST 1050, rolled product | ≥410 | ≥245 | ≥25 | ≥55 |
| 35 | GOST 1050, rolled product | ≥530 | ≥315 | ≥20 | ≥45 |
| 45 | GOST 1050, rolled product | ≥600 | ≥355 | ≥16 | ≥40 |
| 30KhMA | GOST 4543, quenched and tempered | ≥930 | ≥735 | ≥12 | ≥50 |
Applicable Standards
GOST: GOST 8732-78 for size range of hot-deformed seamless steel pipes; GOST 8731 for technical requirements.
ASTM: ASTM A106 is commonly referenced for seamless carbon steel pipe for high-temperature service.
EN: EN 10216 is commonly used for seamless steel tubes for pressure purposes.
JIS: JIS G3454 is commonly used for carbon steel pipes for pressure service up to about 350°C.
GB: GB/T 8163 is commonly used for seamless steel pipes for liquid service.
Applications
General application sectors: oil and gas, petrochemical processing, power and boiler auxiliaries, construction, general engineering, and machinery manufacturing. GOST 8732-78 seamless hot-deformed pipe is widely selected where buyers need stronger pressure integrity than welded alternatives and flexible downstream machining.
Typical uses by sector
Oil and gas: transmission lines, gathering lines, casing-related auxiliary components, and process piping.
Petrochemical: process lines, heat-transfer lines, and plant utility piping.
Power and thermal systems: boiler auxiliaries, steam lines, and elevated-temperature service sections when the correct grade is selected.
Construction: load-bearing tubular members, sleeves, piles, and structural fabrications.
Mechanical engineering: shafts, bushings, cylinders, machined hollows, and equipment parts.
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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