Hot Products
- Carbon & Carbon Alloy Steel
- Stainless Steel
- Copper & Nickel Alloy
- Heat Efficiency Tubes
- Pipe Fittings
- Pipe Flanges
- Gasket, Stud Bolt &Nut
- Industrial Valves
0102030405
Seamless Copper Alloy Heat Exchanger Tubes from China Suppliers - Reliable Factory for Brass & Copper-Nickel Alloys
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.
Material Codes (Alloy Designations) in 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 (as of current updates):
1. Brass Alloys
- H68A – Copper-zinc alloy (68% Cu, rest Zn)
- HSn70-1 – Tin brass (70% Cu, ~1% Sn, rest Zn)
- HAI77-2 – 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).
Want to order the same ? Contact us Now to send your request!
Frequently Asked Questions (FAQ)
What applications is the GB/T 8890 standard used for?
GB/T 8890 specifies the requirements for seamless copper and copper alloy tubes used specifically for heat exchangers and condensers.
What are the common copper alloy material codes covered under this standard?
Common alloys include Brass Alloys (such as H68A, HSn70-1, and HAI77-2) and Copper-Nickel Alloys (such as BFe10-1-1 and BFe30-1-1).
What details should be provided when ordering GB/T 8890 tubes?
Buyers should specify the standard number, material code/alloy designation, dimensions (outer diameter, wall thickness, length), surface condition, testing requirements, and any other special requirements.
What inspections and tests are required to ensure compliance?
Compliance testing includes chemical analysis, mechanical testing (tensile strength and elongation), non-destructive testing (eddy current or ultrasonic), visual inspection for surface quality, and dimensional verification. Hydrostatic pressure testing is also available per customer request.
What are the typical dimensional tolerances for these tubes?
Dimensional tolerances for outer diameter range from ±0.10 to 0.50 mm, and wall thickness tolerances are typically ±5% to 10% of the nominal thickness.
What information is included in the manufacturer's compliance certificate?
The compliance test certificate provides the chemical composition, mechanical test results, NDT reports (if applicable), and an official statement confirming compliance with the GB/T 8890 standard.