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Seamless Hot-Rolled Steel Pipes GOST 8732 from China Suppliers - Quality Factory Manufacturing for Structural Applications
Ordering Information
When ordering pipes under GOST 8732, the following must be specified:
- Standard designation (e.g., GOST 8732-202X)
- Dimensions (outer diameter, wall thickness, length)
- Steel grade (e.g., St20, 09G2S, 12Х18Н10Т)
- Delivery condition (hot-rolled, heat-treated if required)
- Additional requirements (e.g., non-destructive testing, special tolerances)
Main Steel Grades
The standard includes carbon and alloy steel grades, such as:
| Category | Steel Grades (Examples) |
|---|---|
| Carbon Steels | St10, St20, St35, St45 |
| Low-Alloy Steels | 09G2S, 17G1S, 10Г2 |
| Alloy Steels | 12Х18Н10Т (stainless), 30ХГСА |
📌 Note: Chemical composition and mechanical properties (yield strength, tensile strength, elongation) are specified in referenced standards (e.g., GOST 1050, GOST 4543).
Dimensional Tolerances
Outer Diameter
±1.0 – 1.5%
Varies by size
Wall Thickness
±10 – 12.5%
Length — Unmeasured
+100 mm
Length — Measured
±10 mm
Inspection & Testing Requirements
Pipes must undergo:
- Mechanical Tests (tensile, hardness) – sampled per batch.
- Hydraulic Pressure Test (optional, if specified).
- Non-Destructive Testing (NDT) (ultrasonic or eddy current, if required).
- Visual & Dimensional Inspection (surface defects, ovality, straightness).
Marking & Packaging
Each pipe is marked with:
- Manufacturer's name / logo
- Steel grade
- Heat number
- Inspection certificate number
Packaging: Bundled with protective coatings (anti-rust oil, varnish) or as agreed.
Certification
Suppliers must provide a certificate of compliance including:
- Chemical analysis
- Mechanical test results
- Heat treatment data (if applicable)
- NDT reports (if applicable)
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❓ Frequently Asked Questions (FAQ)
Q What is GOST 8732 and what types of pipes does it cover?
GOST 8732 is a Russian/CIS standard that governs seamless hot-rolled steel pipes. It specifies requirements for dimensions, tolerances, steel grades, mechanical properties, inspection, marking, and delivery conditions for pipes used in industrial, structural, and pressure applications.
Q Which steel grades are available under GOST 8732?
GOST 8732 covers a wide range of steel grades including carbon steels (St10, St20, St35, St45), low-alloy steels (09G2S, 17G1S, 10Г2), and alloy steels such as 12Х18Н10Т (stainless) and 30ХГСА. The specific chemical and mechanical properties are referenced from GOST 1050 and GOST 4543.
Q What dimensional tolerances apply to GOST 8732 pipes?
Outer diameter tolerances are ±1.0–1.5% depending on size, while wall thickness tolerances are ±10–12.5%. For length, unmeasured pipes carry a +100 mm tolerance, and measured pipes are held to ±10 mm.
Q What testing and inspection is required for GOST 8732 pipes?
Pipes must pass mechanical tests (tensile and hardness) sampled per batch, visual and dimensional inspection for surface defects, ovality, and straightness. Hydraulic pressure testing and non-destructive testing (ultrasonic or eddy current) are performed when specified by the customer or application requirements.
Q What documentation is provided with GOST 8732 pipes?
Each shipment is accompanied by a certificate of compliance that includes chemical analysis results, mechanical test data, heat treatment records (if applicable), and NDT reports (if applicable). Each pipe is also individually marked with the manufacturer's name, steel grade, heat number, and certificate number.
Q What information is needed when placing an order for GOST 8732 pipes?
When ordering, customers should specify the standard designation (e.g., GOST 8732-202X), outer diameter and wall thickness, required length, steel grade, delivery condition (hot-rolled or heat-treated), and any additional requirements such as non-destructive testing or special dimensional tolerances.