Eliminate premium alloy surcharges and unreliable lead times. Our C70600 (90/10 CuNi) weld neck flanges are precision-machined to ASME B16.5, with full material traceability and pressure ratings up to 2500# — purpose-built for desalination, offshore, and chemical processing systems.
⚓ ASME B16.5 · ASTM B564 · ABS Approved
Eliminate premium alloy surcharges and unreliable lead times. Our C70600 (90/10 CuNi) weld neck flanges are precision-machined to ASME B16.5, with full material traceability and pressure ratings up to 2500# — purpose-built for desalination, offshore, and chemical processing systems.
Our Cangzhou production facility — 12 CNC machining lines for CuNi flanges
When you're specifying C70600 weld neck flanges for critical seawater or chemical service, choosing the wrong supplier isn't just a procurement headache — it's a catastrophic risk to your entire pipeline system.
Many traders mark up CuNi flanges by 30–45% without offering any engineering support, mill test reports, or certified material traceability. You end up paying for a middleman, not for quality.
C70600 requires a precise 90% copper / 10% nickel ratio with controlled iron and manganese. Non-certified suppliers often substitute scrap metal, leading to accelerated pitting and galvanic corrosion within months of installation.
Freight costs for oversized flange shipments are skyrocketing. Poorly crated products arrive bent, scratched, or with damaged sealing faces. A single rejected batch can delay your project by 3–6 weeks.
Flanges that fail to meet ASME B16.5 pressure-temperature ratings or lack EN 10204 3.1 certification can shut down your entire project during third-party inspection.
🔧 The solution isn't just a flange — it's a certified supply chain partner.
Our c70600 weld neck flange is engineered for the most demanding industrial pipeline systems. As a wholesale-direct manufacturer, we give you complete control over quality, cost, and delivery — with zero middlemen.
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From raw copper-nickel ingots to final CNC machining, our Cangzhou facility controls every production step. This vertical integration eliminates quality variability and cuts waste — passing 15–20% cost savings directly to you.
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Each flange ships with a full EN 10204 3.1 / 3.2 mill test certificate, including chemical composition, mechanical properties, PMI test report, and hydrostatic test records. Complete traceability, every single batch.
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Buffer stock of raw forgings allows 15-day delivery for standard sizes (1/2"–24"), and 30 days for custom OEM/ODM dimensions. Express airfreight options available for emergency break-fix orders.
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Our in-house engineers assist with custom bore sizes, special face finishes (6.3 Ra), and non-standard pressure classes. We've supplied bespoke C70600 flanges for LNG carriers, offshore platforms, and nuclear retrofit projects.
Corrosion Rate in Seawater: 0.025 mm/year — 8x better than carbon steel
Yield Strength: ≥ 125 MPa (min) at ambient temperature
Biofouling Resistance: Excellent — ideal for seawater intake lines
Pitting Resistance Equivalent (PRE): 9.8 — outperforms 316L in chloride-rich media
Complete engineering data for procurement professionals and piping design engineers. All dimensions comply with the latest ASME B16.5 and ASME B16.47 standards.
| Parameter | Specification | Notes |
|---|---|---|
| Material | C70600 (UNS) — 90/10 Copper-Nickel | Cu 88.6–90.8%, Ni 9.5–10.5%, Fe 1.3–1.7%, Mn 0.3–1.0% |
| Manufacturing Standard | ASTM B564 / ASME SB564 | Forgings — hot formed, solution annealed |
| Dimensional Standard | ASME B16.5 — Class 150 to 2500 | For NPS 1/2" to 24" |
| Face Types | RF, FF, RTJ, Tongue & Groove | Serrated or smooth finish available |
| Pressure Ratings | 150#, 300#, 600#, 900#, 1500#, 2500# | Full pressure-temperature chart per ASME B16.5 |
| Tensile Strength (min) | ≥ 310 MPa (45,000 psi) | Room temperature test per ASTM E8 |
| Yield Strength (min) | ≥ 125 MPa (18,000 psi) | 0.2% offset method |
| Elongation (min) | 30% in 2 inches | Ensures ductility for welding |
| Hardness | 70–90 HRB | Consistent machining behavior |
| Testing | Hydrostatic, PMI, Dye Penetrant, UT (optional) | Third-party inspection accepted (BV, SGS, Lloyd's) |
| Marking | ASTM SB564, UNS C70600, size, class, heat no. | Low-stress stamping per MSS-SP-25 |
The tapered hub of a weld neck flange provides superior stress distribution at the pipe-to-flange junction. According to the Reference Stress Method for Defective Elbows (Academia.edu), proper hub geometry significantly reduces stress intensification factors at pipe bends and discontinuities — a critical consideration for high-pressure C70600 lines.
Our C70600 weld neck flanges are deployed across sectors where corrosion resistance, low magnetic permeability, and long service life are non-negotiable.
Every C70600 weld neck flange is manufactured in our ISO 9001:2015 certified facility and is backed by complete documentary traceability.
ISO 9001
CE (PED)
UL
GS
ANSI
Our standard MOQ is 10 pieces for popular sizes (NPS 2"–12", Class 150/300). For mixed-size orders or special materials certification, MOQ may be 20 pieces. We also offer sample orders (1–2 pieces) for pre-qualification at a small premium — fully credited back on your first bulk order.
As a vertically integrated factory in China's supply chain, we typically offer 25–40% lower pricing than equivalent European or North American mills — without compromising on material certification. Pricing is formula-based (alloy surcharge + machining + finish), updated monthly to reflect LME copper and nickel market prices.
Every shipment includes: EN 10204 3.1 mill certificates, material test reports (chemical + mechanical), dimensional inspection reports, PMI test certificates, hydrostatic test records (if required), packing list, and certificate of origin. Third-party inspection by SGS, BV, or TÜV can be arranged at your cost.
Yes. Our CNC lathes and vertical turning centers handle custom hub tapers, extra-long weld necks, or unusual drilling patterns per your drawings. We can achieve surface finishes down to 6.3 µm Ra for RTJ faces. Standard lead time for custom dimensions is 25–35 days.
We ship via all major freight forwarders (DHL, FedEx, UPS for samples; sea freight for bulk orders). Flanges are individually protected with anti-corrosion VCI paper, wooden crates or pallets per ISPM-15. We can arrange DDP or DAP delivery to your warehouse, with full customs clearance support.
We provide a 12-month warranty against manufacturing defects. Our technical team is available 24/7 via WhatsApp/email for installation troubleshooting. In case of any quality dispute, we follow a transparent replacement or refund process within 15 business days.
Senior Piping Engineer, Hamburg, Germany
"We replaced a batch of failed 316L flanges on our chemical brine lines with Weihuan's C70600 weld neck flanges (Class 300, NPS 8"). The 3.1 material certs were flawless, and the dimensional accuracy was within ±0.5mm. That's 18 months in service now — zero leaks, zero corrosion."
★★★★★
Procurement Manager, Offshore Marine Services, Aberdeen, UK
"Their wholesale pricing was 32% below our previous European supplier. But what really impressed me was the logistics — the entire order of 145 flanges arrived in Aberdeen 2 weeks ahead of schedule, properly crated and with complete documentation. We've now made them our approved vendor for all CuNi fittings."
★★★★★
Operations Director, Desalination Solutions, Valencia, Spain
"We specified C70600 weld neck flanges for a 50.000 m³/day SWRO plant expansion. Weihuan's team provided custom hub dimensions that saved us €28,000 in fabrication costs — the tapered hubs aligned perfectly with our prefabricated spools. The PMI test results came back 100% within UNS C70600 spec."
★★★★★Screenshots from recent client consultations — technical questions answered in real-time.
With 15+ years of experience in copper-nickel alloy metallurgy and global piping systems, I've overseen the supply of over 2 million flanges to clients across North America, Europe, and the Middle East. I'm responsible for ensuring that every C70600 flange leaving our factory meets the strictest international standards — from material chemistry to final dimensional inspection. This article draws on my day-to-day engineering conversations with procurement teams, as well as published research on flange stress behavior and material selection. Connect with me directly: whxs@weihuantube.com
Get a factory-direct quote within 24 hours. Mention this article and receive a free material sample kit (includes C70600, C71500, and 316L coupons) with your first order.
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