Light Drawn ASTM B111 C68700 0.5mm Wall Thickness Copper Alloy Tube

Light drawn ASTM B111 C68700 0.5mm wall thickness copper alloy tube is a seamless tube manufactured for condenser and heat exchanger applications. The "light drawn" process produces a tube with smooth surface finish and precise dimensional tolerance. C68700 (aluminum brass) contains aluminum and arsenic for corrosion resistance in seawater and brackish water.

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Mill polished

Bright

Oiled

Hair line

Brush

Mirror

Sand blast

For C68700, annealed condition (O61) provides ≥50% elongation, suitable for bending, flaring, and rolling into tube sheets.

Air conditioning and refrigeration field service

Heat exchangers

Condensers

Water evaporators

Boiler blowdown heat exchangers

Air coolers

Gland steam condensers

Steam ejectors

Turbine oil coolers

Fuel oil heaters

Compressed air inter and after coolers

Ferrules

Oil well pump liners

Distillers

Marine industry

Nuclear power plants

Q1: What is the MOQ for C68700 0.5mm wall thickness tube?

A: The MOQ for C68700 0.5mm tube is 500 kg. For standard sizes (OD 16-25mm, WT 0.5mm), GNEE accepts small trial orders. Special sizes require negotiation.

Q2: Which is more expensive, ASTM B111 C68700 or C44300?

A: C68700 is 10-15% more expensive than C44300. C68700 contains aluminum and arsenic, offering better resistance to high-velocity seawater impingement. C44300 contains tin and suits lower-velocity contaminated water. Choice depends on your flow rate and water quality.

Q3: Can 0.5mm wall C68700 tube be bent?

A: Yes. Minimum bend radius is 2 x OD. Always use annealed (O61) C68700 tube. For 0.5mm thin wall, use a mandrel during bending to prevent collapse.

Q4: What filler metal is recommended for welding C68700?

A: Use ERCuAl-A1 (CuAl8) aluminum bronze filler. Welding method: TIG. Parameters: 80-120A, argon purity ≥99.99%, preheat to 150°C. Skip preheating and you risk arsenic porosity.

Q5: How many years does C68700 last in seawater?

A: Design life is >15 years. Per ASTM G48, C68700 has dezincification depth <200μm/year. Actual life depends on seawater temperature, flow velocity, and sand content. Condenser tubes typically last 15-20 years.

Q6: What grade can replace C68700 if not available?

A: C70600 (90-10 copper-nickel) is a direct substitute but costs 40% more. C70600 has better corrosion resistance but only 60% of C68700's thermal conductivity. For flow velocity <2m/s, consider C44300. For fresh water, use C12200.

Q7: What is the hardness difference between annealed and hard temper C68700?

A: Annealed (O61): HRB 55-65. Hard (H04): HRB 170-180. Use annealed for bending and tube expansion. Use hard for straight tubes with no bending. For 0.5mm thin wall, only annealed temper is typically supplied.

Q8: What surface finishes are available for C68700 tube?

A: Bright, mirror, brushed, oiled, pickled. Bright finish is for condensers. Mirror finish is for decorative or special cleaning requirements. Brushed finish is for anti-slip surfaces. GNEE offers custom finishes on request.

Q9: What test reports are available for ASTM B111 C68700 tube?

A: MTC (mill test certificate), third-party inspection report, EN 10204 3.1. Tests include chemical composition, mechanical properties, flaring test, flattening test, and eddy current testing. GNEE provides full reports with each shipment.

Q10: What is the lead time for 0.5mm wall C68700 tube?

A: Standard sizes: 15-25 days. Special sizes: 30-40 days. Lead time starts after order confirmation and deposit. GNEE can expedite small quantities within 10 days. Contact GNEE for current stock availability.

Every tube in this lot has passed third-party witnessed inspection per ASTM B111 standard for C68700 alloy. Below are actual photos from customer-onsite inspection, including eddy current testing and dimensional verification.

Inspection items verified:
• Eddy current testing (ECT) – no through-wall defects
• Outer diameter & wall thickness – within ±0.02mm tolerance
• Surface finish & temper (O61) – conforms to ASTM
• Hardness & chemical composition – certified.

After passing inspection, all tubes are packed according to export standards and customer-specific requirements. The packing process is documented below to ensure traceability and damage-free delivery.

Packing steps shown in video & images:
1. Tube cleaning & drying
2. Plastic end caps on both ends
3. VCI anti-rust paper wrapping
4. Bundle strapping with moisture barrier film
5. Plywood wooden case (ISPM-15 compliant) with foam padding
6. Labeling with ASTM grade, lot number, and inspection stamp

All ASTM C68700 tubes are produced and inspected on our in-house equipment, allowing full process control from billet casting to final packing.

Key equipment used for this lot:
• Induction melting furnace – precise alloying (Cu + Zn + Al + As)
• Horizontal continuous casting – uniform billet structure
• Extrusion press (800T / 1630T) – seamless tube forming
• Cold drawing bench (5–40m) – dimensional accuracy to ±0.02mm
• Online eddy current tester (FOERSTER / MAC) – 100% NDT
• Ultrasonic wall thickness gauge – real-time monitoring
• Annealing furnace (controlled atmosphere) – temper O61

In-house metrology: Micrometers, pin gauges, optical comparator, hardness tester (HV/HRB)

All equipment is calibrated quarterly. Production records are traceable by lot number.

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