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Seamless Copper Alloy Heat Exchanger Tubes from China Suppliers - Reliable Factory for Industrial Applications
Normative References
References other standards such as:
- GB/T 228 (tensile testing)
- GB/T 5121 (chemical analysis of copper alloys)
- GB/T 5248 (non-destructive testing for copper tubes)
Ordering Information
Buyers should specify the following when ordering:
- Standard number (GB/T 8890)
- Material code/alloy designation (e.g., HSn70-1, BFe10-1-1)
- Dimensions (outer diameter, wall thickness, length)
- Surface condition (bare, coated, etc.)
- Testing requirements (e.g., hydrostatic, eddy current, or ultrasonic testing)
- Special requirements (if any)
Material Codes & Chemical Composition
Common alloys covered:
- HSn70-1 (Tin brass)
- BFe10-1-1 (Copper-nickel alloy)
- BFe30-1-1 (Cu-Ni-Fe alloy)
- Others (e.g., HAl77-2, H68A)
Chemical composition limits for each alloy are specified (e.g., Cu, Ni, Fe, Sn, Zn percentages).
Manufacturing & Dimensions
- Production method: Seamless, cold-drawn or hot-extruded.
- Dimensional tolerances: Outer diameter (±0.10–0.50 mm), wall thickness (±5–10% of nominal thickness).
- Length: Fixed or random lengths, typically 1–7 meters.
Mechanical Properties
- Tensile strength, yield strength, and elongation requirements vary by alloy (e.g., HSn70-1: tensile strength ≥295 MPa).
- Hardness (optional, per agreement).
Inspection & Testing Requirements
- Chemical analysis: Per GB/T 5121.
- Mechanical tests: Tensile testing (GB/T 228).
- Hydrostatic pressure test (optional, per customer request).
- Non-destructive testing (NDT): Eddy current (GB/T 5248) or ultrasonic testing.
- Surface quality: Visual inspection for defects (cracks, scratches, etc.).
- Dimensional inspection: Verify OD, wall thickness, and straightness.
Surface Finish & Defects
- Tubes must be free from cracks, inclusions, and severe scratches.
- Minor surface imperfections allowed if within dimensional tolerances.
Marking & Packaging
- Marking: Includes manufacturer's name, alloy grade, dimensions, batch number, and standard number (GB/T 8890).
- Packaging: Bundled with protective coatings to prevent corrosion during transit.
Certification & Compliance
Manufacturers must provide a test certificate including:
- Chemical composition
- Mechanical test results
- NDT reports (if applicable)
- Compliance statement with GB/T 8890
The GB/T 8890 standard covers several copper alloy material codes used for seamless heat exchanger and condenser tubes. Below is a list of the primary material codes (alloy designations) specified in the latest version of the standard:
Material Codes (Alloy Designations) in GB/T 8890
1. Brass Alloys
- H68A – Copper-zinc alloy (68% Cu, rest Zn)
- HSn70-1 – Tin brass (70% Cu, ~1% Sn, rest Zn)
- HAl77-2 – Aluminum brass (77% Cu, ~2% Al, rest Zn)
2. Copper-Nickel Alloys (Cu-Ni)
- BFe10-1-1 – 90% Cu, 10% Ni, ~1% Fe, ~1% Mn
- BFe30-1-1 – 66% Cu, 30% Ni, ~1% Fe, ~1% Mn
3. Other Copper Alloys
May include additional grades depending on the latest revision.
Key Notes
- Chemical composition limits (e.g., Cu%, Ni%, Fe%, Sn%) are specified for each alloy.
- Mechanical properties (tensile strength, yield strength, elongation) vary by material code.
- Application suitability depends on corrosion resistance (e.g., seawater, steam, chemical environments).
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❓ Frequently Asked Questions (FAQ)
Q
What is GB/T 8890 and what products does it cover?
GB/T 8890 is a Chinese national standard that specifies the requirements for seamless copper alloy tubes used in heat exchangers and condensers. It covers alloy designations, dimensional tolerances, mechanical properties, inspection methods, marking, and packaging requirements for these tubes.
Q
Which copper alloy grades are available under GB/T 8890?
The standard includes brass alloys such as H68A, HSn70-1 (Tin brass), and HAl77-2 (Aluminum brass), as well as copper-nickel alloys including BFe10-1-1 (90/10 Cu-Ni) and BFe30-1-1 (70/30 Cu-Ni). Additional grades may be included in the latest revision of the standard.
Q
What dimensional tolerances are specified in GB/T 8890?
The standard specifies outer diameter tolerances of ±0.10–0.50 mm and wall thickness tolerances of ±5–10% of the nominal thickness. Tube lengths are typically 1–7 meters, available as fixed or random lengths.
Q
What testing and inspection methods are required by GB/T 8890?
Required inspections include chemical analysis (per GB/T 5121), mechanical testing such as tensile testing (per GB/T 228), surface visual inspection, and dimensional verification. Optional tests include hydrostatic pressure testing and non-destructive testing (NDT) such as eddy current (GB/T 5248) or ultrasonic testing, based on customer requirements.
Q
What information should I provide when placing an order for GB/T 8890 tubes?
When ordering, buyers should specify the standard number (GB/T 8890), alloy designation (e.g., HSn70-1, BFe10-1-1), required dimensions (outer diameter, wall thickness, and length), surface condition, testing requirements, and any special requirements applicable to their application.
Q
What documentation is provided with GB/T 8890 compliant tubes?
Manufacturers are required to supply a test certificate that includes the chemical composition results, mechanical test results, NDT reports (if applicable), and a compliance statement confirming conformance with GB/T 8890. This documentation ensures full traceability and quality assurance for every batch.