Seamless Copper Alloy Heat Exchanger Tubes - Quality Products from China Suppliers and Factory

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)

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)

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).

• 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.

• Tensile strength, yield strength, and elongation requirements vary by alloy (e.g., HSn70-1: tensile strength ≥295 MPa).
• Hardness (optional, per agreement).

• 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.

• Tubes must be free from cracks, inclusions, and severe scratches.
• Minor surface imperfections allowed if within dimensional tolerances.

• 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.

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 (as of current updates):

• 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)

• BFe10-1-1 – 90% Cu, 10% Ni, ~1% Fe, ~1% Mn
• BFe30-1-1 – 66% Cu, 30% Ni, ~1% Fe, ~1% Mn

(May include additional grades depending on the latest revision)

• 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).