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- Carbon & Carbon Alloy Steel
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GB/T 14976 – Seamless Steel Tubes for Fluid Transportation
Normative References
- References other GB standards for testing, dimensions, and material properties (e.g., GB/T 222, GB/T 223, GB/T 241).
Ordering Information
Buyers must specify:
- Steel grade (e.g., 10, 20, 16Mn, 304, 316L).
- Dimensions (outer diameter, wall thickness, length).
- Manufacturing process (hot-rolled/cold-drawn).
- Special requirements (e.g., heat treatment, non-destructive testing).
Steel Grades and Chemical Composition
- Common grades include carbon steel (10, 20), low-alloy steel (16Mn), and stainless steel (304, 316L).
- Chemical composition must comply with specified limits (e.g., C, Si, Mn, P, S, Cr, Ni for stainless steels).
Manufacturing Process
- Tubes are produced via hot rolling, cold drawing, or cold rolling.
- Heat treatment (annealing, normalizing, or quenching/tempering) is required for certain grades.
Technical Requirements
- Dimensions & Tolerances: Must meet GB/T 17395 standards.
- Mechanical Properties: Tensile strength, yield strength, elongation per grade.
- Hydrostatic Test: Mandatory (test pressure calculated per formula).
- Surface Quality: Free from cracks, folds, and severe scratches.
- Non-Destructive Testing (NDT): Ultrasonic or eddy current testing if specified.
Inspection and Testing
- Chemical analysis (per GB/T 222/223).
- Mechanical tests (tensile, hardness, flattening, flaring, etc.).
- Hydrostatic/NDT tests.
- Sampling frequency: Batch-wise (e.g., 10% for mechanical tests).
Marking and Packaging
- Tubes are marked with steel grade, size, standard number, and manufacturer’s name.
- Packaging: Bundled or crated with rust-proof measures for transport.
Certification
- Manufacturer provides a quality certificate including test results and compliance statement.
Key Notes
- Latest Version: Confirm if GB/T 14976-XXXX (replace XXXX with the current year) supersedes older editions.
- Stainless Steel Grades: Added in recent updates (e.g., 304, 316L).
- NDT Emphasis: Enhanced inspection requirements in newer versions.
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