GOST 8734-75 Seamless Cold Formed Steel Pipe Carbon Steel Seamless Pipe
GOST 8734-75 Seamless Cold Formed Steel Pipe Carbon Steel Seamless Pipe
Material
GOST 8734-75 seamless cold formed steel pipe is a carbon steel seamless tube produced by cold drawing or cold rolling to achieve tighter dimensional tolerance, smoother surface quality, and better consistency than conventional hot-finished tubing. It is widely used where buyers need reliable strength, clean internal and external surfaces, and stable OD/WT control for further machining, hydraulic use, and structural/mechanical assemblies. GOST 8734-75 defines the size range, while technical delivery requirements are typically applied together with GOST 8733-74.
Specifications
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Standard: GOST 8734-75
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Related technical requirements: GOST 8733-74
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Product type: Seamless cold formed steel tube
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Manufacturing process: Cold drawn / cold rolled seamless
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Outside diameter range: 5-250 mm
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Wall thickness range: 0.3-24 mm
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Length:
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Random length: 1.5-11.5 m
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Fixed length: 4.5-9 m
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Multiple length: 1.5-9 m
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Wall classification:
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Extra-thin wall
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Thin wall
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Thick wall
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Extra-thick wall
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Common steel grades: 10, 20, 35, 45, St3sp, and other agreed grades depending on end use and supply condition.
Main Features
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High dimensional precision from cold-forming
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Smooth, clean surface suitable for machining and coating
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Seamless structure for dependable pressure integrity
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Uniform wall thickness and improved concentricity
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Good machinability across common carbon steel grades
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Wide grade selection for strength, formability, and weldability balance
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Suitable for hydraulic, mechanical, automotive, and general engineering service.
Our Advantages
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Buyers worry about dimensional tolerance and fit-up consistency.
We supply cold formed seamless tubes specifically for applications where OD/WT consistency matters. Compared with hot-finished tube, cold drawn tubing offers tighter dimensional accuracy, better wall uniformity, and smoother surfaces, which helps reduce secondary machining and assembly deviation. -
Buyers worry about surface quality for hydraulic and precision parts.
GOST 8734-75 products are widely selected for hydraulic systems, mechanical structures, and precision-use components because cold forming provides a cleaner surface and improved finish. This is especially useful for cylinders, sleeves, bushings, and machined assemblies where surface defects increase rework risk. -
Buyers worry about standard compliance and material traceability.
We organize production around the GOST route clearly: GOST 8734-75 for dimensions and assortment, GOST 8733-74 for technical requirements, and the corresponding grade standards such as GOST 1050 or GOST 380 for chemistry and mechanical properties. This makes procurement documentation, inspection records, and material substitution much easier for international projects.
Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Ni | Cu | As |
|---|---|---|---|---|---|---|---|---|---|
| 10 | 0.07-0.14 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.040 | ≤0.15 | ≤0.30 | ≤0.30 | — |
| 20 | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | ≤0.035 | ≤0.040 | ≤0.25 | ≤0.30 | ≤0.30 | — |
| 35 | 0.32-0.40 | 0.17-0.37 | 0.50-0.80 | ≤0.030 | ≤0.035 | ≤0.25 | ≤0.30 | ≤0.30 | ≤0.08 |
| 45 | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | ≤0.035 | ≤0.040 | ≤0.25 | ≤0.25 | ≤0.25 | ≤0.08 |
| St3sp | 0.14-0.22 | 0.15-0.30 | 0.40-0.65 | ≤0.040 | ≤0.050 | ≤0.30 | ≤0.30 | ≤0.30 | — |
Mechanical Properties
| Grade | Yield Strength / Creep Limit (MPa) | Tensile Strength (MPa) | Elongation (%) | Reduction of Area (%) |
|---|---|---|---|---|
| 10 | ≥205 | ≥330 | ≥31 | ≥55 |
| 20 | ≥245 | ≥410 | ≥25 | ≥55 |
| 35 | ≥315 | ≥530 | ≥20 | ≥45 |
| 45 | ≥355 | ≥600 | ≥16 | ≥40 |
| St3sp* | ≥245 (up to 20 mm) | 370-480 | ≥26 (up to 20 mm) | — |
Execution Standards
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GOST: GOST 8734-75 for dimensions and assortment; GOST 8733-74 for technical requirements of cold-finished seamless steel tubes.
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ASTM: ASTM A519/A519M covers seamless carbon and alloy steel mechanical tubing, including cold-finished tubing.
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EN: EN 10305-1 covers seamless cold drawn precision steel tubes for precision applications.
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JIS: JIS G3445 covers carbon steel tubes for machine structural purposes.
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GB: GB/T 3639-2021 covers seamless cold-drawn or cold-rolled steel tubes for precision applications.
Applications
GOST 8734-75 cold formed seamless carbon steel pipe is mainly used in industries that require dimensional precision, smooth surfaces, and dependable mechanical performance. Common sectors include mechanical engineering, hydraulic and pneumatic systems, automotive parts, precision machining, and general equipment manufacturing.
Typical Use by Industry
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Hydraulic and pneumatic systems: cylinder tubes, sleeves, line tubing, precision fluid power components
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Automotive manufacturing: shock absorber parts, bushings, steering and chassis components, machined blanks
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Mechanical engineering: shafts, spacers, rollers, sleeves, bearing seats, structural machine parts
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General fabrication: precision structural members, instrument housings, connectors, custom machined tubular parts
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Equipment manufacturing: conveyors, agricultural machinery components, industrial assemblies, tooling bodies
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.
Get in Touch
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