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The ASTM B42 Seamless Copper Pipe is produced from phosphorus-deoxidized, high residual phosphorus (DHP) copper designated as UNS C12200. This alloy provides excellent resistance to hydrogen embrittlement and outstanding thermal and electrical conductivity. The seamless structure ensures uniform wall thickness, leak-free performance, and high mechanical strength, making it ideal for water supply systems, HVAC, and general engineering applications.
Each pipe is manufactured in compliance with ASTM B42 and is subjected to rigorous testing for chemical composition, mechanical properties, and dimensional accuracy to ensure long-lasting performance and consistent quality.
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What Is ASTM B42 Seamless Copper Pipe?
ASTM B42 Seamless Copper Pipe is a seamless wrought copper pipe manufactured in standard nominal pipe sizes for plumbing systems, boiler feed lines, water supply networks and industrial piping applications. The specification covers both regular wall and extra-strong wall copper pipes, providing excellent corrosion resistance, high thermal conductivity and long service life.
ASTM B42 copper pipe is commonly manufactured from C12200 phosphorus-deoxidized copper, one of the most widely used copper materials in plumbing and industrial piping systems because of its excellent weldability and resistance to water corrosion. ASTM B42 covers seamless copper pipe in standard pipe sizes with regular and extra-strong wall thicknesses.
Why Engineers Choose ASTM B42 Copper Pipe
Excellent Corrosion Resistance
Suitable for potable water systems and underground piping installations.
High Thermal Conductivity
Copper provides superior heat transfer efficiency compared with steel and stainless steel.
Long Service Life
Expected service life often exceeds 50 years under proper operating conditions.
Leak-Free Performance
Seamless manufacturing eliminates weld defects and improves pressure reliability.
Easy Fabrication
Suitable for bending, flaring, soldering and brazing operations.
Products Description
✅ Material: Phosphorus-Deoxidized Copper (C12200 / DHP Copper)
✅ Standard: ASTM B42
✅ Type: Seamless Round Pipe
✅ Finish: Bright Annealed or Mill Finish
✅ Temper: Drawn (H58) or Annealed (O60)
✅ Corrosion-Resistant to water, steam, and mild chemicals
✅ Excellent Weldability and Formability
✅ High Thermal & Electrical Conductivity
Chemical Composition (Typical %)
| Element | Cu (incl. Ag) | P | Others |
|---|---|---|---|
| Content | 99.9 (min) | 0.015 – 0.040 | ≤ 0.06 |
Mechanical Properties
| Property | Annealed (O60) | Drawn (H58) |
|---|---|---|
| Tensile Strength (MPa) | ≥ 205 | ≥ 250 |
| Yield Strength (MPa) | ≥ 65 | ≥ 205 |
| Elongation (%) | ≥ 30 | ≥ 10 |
| Hardness (HV) | ≤ 65 | ≥ 80 |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.94 g/cm³ |
| Electrical Conductivity | 85% IACS |
| Thermal Conductivity | 390 W/m·K |
| Melting Point | 1083°C |
Standard Dimensions (ASTM B42 Seamless Copper Pipe)
| Nominal Size (in.) | Outside Diameter (in.) | Outside Diameter (mm) | Wall Thickness (in.) | Wall Thickness (mm) | Typical Length (m) |
|---|---|---|---|---|---|
| 1/4 | 0.375 | 9.52 | 0.030 | 0.76 | 3.0 – 6.0 |
| 3/8 | 0.500 | 12.70 | 0.035 | 0.89 | 3.0 – 6.0 |
| 1/2 | 0.625 | 15.88 | 0.035 | 0.89 | 3.0 – 6.0 |
| 5/8 | 0.750 | 19.05 | 0.040 | 1.02 | 3.0 – 6.0 |
| 3/4 | 0.875 | 22.23 | 0.045 | 1.14 | 3.0 – 6.0 |
| 1 | 1.125 | 28.58 | 0.050 | 1.27 | 3.0 – 6.0 |
| 1-1/4 | 1.375 | 34.93 | 0.055 | 1.40 | 3.0 – 6.0 |
| 1-1/2 | 1.625 | 41.28 | 0.060 | 1.52 | 3.0 – 6.0 |
| 2 | 2.125 | 53.98 | 0.070 | 1.78 | 3.0 – 6.0 |
| 2-1/2 | 2.625 | 66.68 | 0.080 | 2.03 | 3.0 – 6.0 |
| 3 | 3.125 | 79.38 | 0.090 | 2.29 | 3.0 – 6.0 |
| 4 | 4.125 | 104.78 | 0.107 | 2.72 | 3.0 – 6.0 |
| 5 | 5.125 | 130.18 | 0.125 | 3.18 | 3.0 – 6.0 |
| 6 | 6.125 | 155.58 | 0.140 | 3.56 | 3.0 – 6.0 |
📎 Custom dimensions, tempers, and cut-to-length services available upon request.
ASTM B42 vs ASTM B88 Copper Pipe
| Item | ASTM B42 | ASTM B88 |
|---|---|---|
| Product Type | Copper Pipe | Water Tube |
| Size System | NPS Pipe Size | Tube Size |
| Main Application | Industrial Piping | Plumbing Systems |
| Wall Thickness | Regular / Extra Strong | Type K / L / M |
| Pressure Capability | Higher | Moderate |
| Installation | Threaded & Welded Systems | Soldered Systems |
Which Is Better?
Choose ASTM B42 when industrial piping strength and standard pipe dimensions are required.
Choose ASTM B88 when potable water distribution systems are the primary application.
Applications
Plumbing and water supply systems
HVAC and refrigeration tubing
Heat exchangers and condensers
Industrial piping systems
Solar energy and gas lines
General mechanical and structural use
Dimensional Tolerances
| Parameter | Tolerance |
|---|---|
| Outside Diameter | ±0.002 in. (±0.05 mm) |
| Wall Thickness | ±10% |
| Length | ±3 mm (per meter) |
| Straightness | 1.5 mm per meter max deviation |
Surface & End Finish
Plain Ends or Deburred Ends
Bright Annealed or Mill Finish
Protective Plastic Caps on Both Ends
Cleaned and Packed for Export
Inspection & Quality Assurance
Every ASTM B42 copper pipe undergoes:
Raw Material Verification
Chemical Composition Analysis
Eddy Current Testing
Hydrostatic Pressure Testing
Dimensional Inspection
Surface Quality Examination
PMI Material Identification
Third-Party Inspection Available
Certificates Available:
EN 10204 3.1
ISO 9001
SGS
BV
TUV
Packing & Delivery
Plastic film + woven bags or wooden cases
Standard export seaworthy packaging
Marking: ASTM B42 – C12200 – Size – Heat No.
Delivery: 7–25 days depending on quantity
FAQ (Frequently Asked Questions)
What is ASTM B42 copper pipe?
ASTM B42 is the standard specification covering seamless copper pipe in standard pipe sizes for plumbing, boiler feed lines and industrial piping systems.
What material is commonly used in ASTM B42 pipe?
The most common material is C12200 phosphorus-deoxidized copper.
Is ASTM B42 pipe seamless?
Yes. ASTM B42 specifically covers seamless copper pipe manufactured without welded seams.
What is the difference between ASTM B42 and ASTM B75?
ASTM B42 covers standard pipe sizes, while ASTM B75 covers general seamless copper tube products.
Can ASTM B42 copper pipe be used underground?
Yes. C12200 copper offers excellent resistance to soil corrosion and underground service environments.
Is ASTM B42 suitable for drinking water?
Yes. ASTM B42 copper pipe is widely used in potable water systems.
What lengths are available?
Standard 3m, 6m and custom cut lengths are available.
Can third-party inspection be arranged?
Yes. SGS, BV, TUV and customer-designated inspections are supported.
Why Choose Xi'an Dongmeng Group Co., Ltd.
✔ 20+ Years Copper Products Manufacturing Experience
✔ ASTM / ASME / EN Standards Compliance
✔ Full Size Inventory Available
✔ OEM & Custom Fabrication Services
✔ Fast Global Delivery
✔ Third-Party Inspection Accepted
✔ Exported To 80+ Countries
✔ Professional Technical Support
Contact Us
Request ASTM B42 Copper Pipe Factory Price
Xi'an Dongmeng Group Co., Ltd.
📞 Phone / WhatsApp / WeChat: +8615769214734
📧 Email: office@dongmjd.com
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