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Seamless Steel Tubes for Fluid Transportation - China Suppliers and Factory for Water, Oil, and Gas Conveying
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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Frequently Asked Questions
What steel grades are available under GB/T 14976?
GB/T 14976 covers a range of steel grades including carbon steel (10, 20), low-alloy steel (16Mn), and stainless steel grades such as 304 and 316L. The appropriate grade depends on your application's pressure, temperature, and corrosion resistance requirements.
What information is required when placing an order for GB/T 14976 seamless steel tubes?
Buyers must specify the steel grade, outer diameter, wall thickness, length, manufacturing process (hot-rolled or cold-drawn), and any special requirements such as heat treatment or non-destructive testing (NDT).
What manufacturing processes are used to produce GB/T 14976 seamless tubes?
Seamless steel tubes under this standard are produced via hot rolling, cold drawing, or cold rolling. Certain grades also require heat treatment processes such as annealing, normalizing, or quenching and tempering to achieve the desired mechanical properties.
Is a hydrostatic test mandatory for GB/T 14976 tubes?
Yes, a hydrostatic test is mandatory for all tubes under GB/T 14976. The test pressure is calculated according to a specified formula to ensure the tubes can safely withstand fluid transportation pressures without leakage or failure.
What non-destructive testing (NDT) methods are applied to these tubes?
When specified by the buyer or required by the standard, ultrasonic testing or eddy current testing is applied to detect internal and surface defects. NDT requirements have been enhanced in newer versions of the GB/T 14976 standard.
What documentation is provided with GB/T 14976 seamless steel tubes?
The manufacturer provides a quality certificate that includes chemical analysis results, mechanical test data, hydrostatic test results, and a compliance statement confirming the tubes meet all requirements of the GB/T 14976 standard.