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China GOST 8732 Seamless Hot-Rolled Steel Pipes - Reliable Suppliers and Factory for Structural Engineering Solutions
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
- Measured: ±10 mm
Inspection & Testing Requirements
Pipes must undergo:
- 1. Mechanical Tests (tensile, hardness) – sampled per batch.
- 2. Hydraulic Pressure Test (optional, if specified).
- 3. Non-Destructive Testing (NDT) (ultrasonic or eddy current, if required).
- 4. 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
Q1
What details must be specified when ordering GOST 8732 pipes?
When ordering, you must specify the standard designation (e.g., GOST 8732-202X), exact dimensions (outer diameter, wall thickness, and length), steel grade, delivery condition (such as hot-rolled or heat-treated), and any additional requirements like non-destructive testing.
Q2
What steel grades are available under the GOST 8732 standard?
GOST 8732 covers carbon steels (such as St10, St20, St35, St45), low-alloy steels (like 09G2S, 17G1S, 10Г2), and alloy steels (including stainless 12Х18Н10Т and 30ХГСА).
Q3
What are the dimensional tolerances for these seamless pipes?
The tolerances are ±1.0–1.5% for the outer diameter, ±10–12.5% for wall thickness, and length tolerances of +100 mm for unmeasured length or ±10 mm for measured length.
Q4
What testing and inspection procedures do the pipes undergo?
Pipes undergo mandatory batch-sampled mechanical tests (tensile and hardness), visual and dimensional inspections for surface defects, ovality, and straightness. Optional tests include hydraulic pressure and non-destructive testing (NDT) like ultrasonic or eddy current.
Q5
How are the pipes marked and packaged for delivery?
Each pipe is clearly marked with the manufacturer's name/logo, steel grade, heat number, and inspection certificate number. For protection, they are bundled and treated with anti-rust oil or varnish.
Q6
What information is included in the compliance certification?
The supplier's certificate of compliance includes chemical analysis, mechanical test results, heat treatment data (if applicable), and non-destructive testing (NDT) reports if requested.