What is ASTM B75 C12200 copper tube?
ASTM B75 is the standard specification for seamless copper tube manufactured for general-purpose applications. It covers tube made from several copper alloys, including C12200 (deoxidized high residual phosphorus copper), as well as C10200 (oxygen-free copper) and a few others.
The specification defines the chemical composition, mechanical properties, dimensional tolerances, and testing requirements for the tube. It does not, however, designate wall thicknesses as Type K, L, or M the way ASTM B88 does. Instead, wall thicknesses are specified by actual dimensions-nominal outside diameter and minimum wall thickness.
ASTM B75 tube is available in both annealed (soft) and drawn (hard) tempers. It is commonly used in industrial settings where the tube is not necessarily intended for potable water, refrigeration, or medical gas applications, though it can be used for those purposes if additional certifications are provided.
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What Is C12200 and Why Is It Used in ASTM B75?
C12200 is a deoxidized copper alloy with a phosphorus content between 0.015 and 0.040 percent. The phosphorus removes oxygen during processing, which eliminates the risk of hydrogen embrittlement during brazing and welding. It also improves the material's corrosion resistance in a wide range of environments.
For ASTM B75 applications, C12200 is the most commonly specified alloy because it offers the best combination of fabricability, corrosion resistance, and cost. It bends well, brazes cleanly, and holds up in industrial environments where moisture, chemicals, or temperature cycling are factors.
When you see "ASTM B75 C12200" on a specification or purchase order, it means you are getting seamless copper tube made from deoxidized copper, manufactured to the dimensional and mechanical requirements of ASTM B75.
Key benefits
Excellent thermal conductivity: enables fast and efficient heat exchange with minimal energy loss.
High corrosion resistance: suitable for use in freshwater and mildly aggressive environments.
Ease of fabrication and joining: supports brazing, welding, and soldering for efficient assembly.
Proven reliability in industry settings: performs under high-pressure and high-temperature conditions.
Long service life: maintains structural and thermal performance over years of use.
Standards compliance: meets ASTM B75, B111, B395 and ASME SB111, SB395 specifications.
Properties of C12200 (DHP) Copper
Chemical Composition
What makes C12200 copper unique is its chemical composition of at least 99.9% copper (Cu) and 0.015% to 0.040% phosphorus (P). The copper content of this metal also contains silver (Ag). Together, these elements form reliable copper alloy 122, making it suitable for use across diverse industries.
Mechanical Composition
The mechanical properties of copper alloy 122 include:
49,300 psi ultimate tensile strength
45,000 psi yield tensile strength
0.323 pounds-per-inch density
6,380 ksi shear modulus
17,400 ksi modulus of elasticity
1,880° F to 1,980° F melting point
What is the difference between ASTM B75 and ASTM B88?
ASTM B75 is a general-purpose specification for seamless copper tube used in industrial and fabrication applications. ASTM B88 is specifically for water tube used in plumbing and fire sprinkler systems. B88 uses Type K, L, and M wall thickness designations, while B75 specifies wall thickness by actual dimensions. Both can be manufactured from C12200 alloy.
Can I use ASTM B75 C12200 for potable water?
Yes, provided the tube is certified to NSF/ANSI 61 for drinking water applications. However, ASTM B88 is the more common specification for plumbing systems. If your project calls for B88, using B75 may require additional documentation or approval from the specifying engineer.
Is ASTM B75 tube suitable for refrigeration?
Not typically. Refrigeration systems require ASTM B280 ACR tube, which is cleaned, dehydrated, and capped to prevent contamination. ASTM B75 does not carry those cleanliness requirements. Using B75 in a sealed refrigerant system can introduce moisture or debris that may damage compressors.
Our product range
| Product Category | Key Specifications | Common Applications |
|---|---|---|
| Copper Tubes | Outer Diameter: 3–300 mm Wall Thickness: 0.5–10 mm Length: Customized Standards: ASTM B280, EN 1057, JIS H3300 |
Air conditioning, refrigeration, heat exchangers, plumbing, industrial fluid transfer |
| Copper Sheets & Plates | Thickness: 0.5–100 mm Width: up to 3000 mm Length: up to 6000 mm Standards: ASTM B152, EN 1652, GB/T 2040 |
Architectural roofing, busbars, transformer components, industrial panels, heat exchangers |
| Copper Rods & Bars | Diameter: 6–300 mm (round) Cross-section: square, hexagonal, flat Standards: ASTM B124, EN 12163, GB/T 4423 |
Electrical connectors, machining parts, switchgear, fasteners, valve stems |
| Copper Wires | Diameter: 0.1–12 mm Form: bare, tinned, stranded Standards: ASTM B3, EN 13601, IEC 60228 |
Electrical wiring, cables, grounding, automotive harnesses, transformer windings |
Our factory
Our factory is equipped with a comprehensive range of advanced production facilities dedicated to the copper processing industry. The production line includes state-of-the-art extrusion presses, precision rolling mills, high-speed drawing machines, continuous casting lines, and automated annealing furnaces, enabling us to manufacture a full spectrum of copper products-tubes, sheets, plates, rods, bars, wires, and strips-with exceptional dimensional accuracy and consistent mechanical properties. To ensure stable output and supply reliability, we operate with an annual production capacity exceeding 80000 tons and maintain a large-scale inventory system that supports just-in-time delivery. Complementing our manufacturing capabilities is a dedicated quality control center equipped with spectrometers, universal testing machines, and hardness testers, ensuring every batch meets international standards such as ASTM, EN, and GB/T. This vertically integrated production setup allows us to control quality at every stage, from raw material selection to final packaging, and to offer flexible customization in dimensions, temper, and surface finishes. With decades of technical expertise and a strong focus on continuous process improvement, we stand as a reliable, large-scale supplier serving clients across global markets.
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