ASME SB171 C61400 Aluminum Bronze Disc with Seawater Erosion Resistance and Precision Machined Finish

Are high-velocity seawater cooling loops causing severe erosion or cavitation failure at your heat exchanger inlet nozzles? Upgrading your internal impact protection with high-strength, anti-galling copper alloys is the industry-proven method to prevent costly tube-end failures in offshore environments.

Yuhong Group Co., Ltd. engineered and custom-supplies premium ASME SB171 C61400 aluminum bronze discs (also referred to as machined round blanks, circles, or plates). These precision-turned heavy disks serve as the rugged foundation for fabricating critical marine-grade heat exchanger internals, including high-velocity impingement plates, compact tubesheets, corrosion-resistant flanges, and heavy backing rings.

Operating in coastal power stations, desalination plants, or marine vessels requires materials that can outperform standard brass and stainless steel under aggressive chloride exposure. Our certified Copper-Aluminum-Iron alloy (nominally 90-92 percent Copper, 6-8 percent Aluminum, 1-3 percent Iron) delivers specific mechanical benefits:

• Exceptional Fluid Erosion Resistance: Withstands continuous high-velocity fluid impact and localized cavitation, making it the ideal choice for anti-erosion shield plates.

• Superior Seawater Corrosion Defense: Outstanding resistance to pitting, crevice corrosion, and bio-fouling in brackish water, chlorinated water, and raw marine environments.

• High Steel-Like Structural Strength: Yield and tensile properties that comfortably exceed standard brass, allowing for thinner component profiles under elevated pressure drops.

• Immunity to Chloride Stress Corrosion Cracking (SCC): Unlike common Austenitic Stainless Steels, C61400 will not suffer sudden stress-corrosion cracking when exposed to hot, high-salinity brine streams.

• Material Specification: ASME SB171 / SB171M Grade C61400 (UNS C61400 Aluminum Bronze)

• Product Form: Precision Lathe-Turned Circular Blanks / Round Discs

• Surface Finish Profile: Smooth, precision-faced finish with uniform lathe turning marks, free of surface scaling or deep tooling scars.

• Maximum Continuous Service Limits: Maintains stable mechanical properties and creep resistance at elevated process temperatures up to 400 degrees Celsius.

• Material Traceability: Hard-stamped with the manufacturer identification, material grade, and unique melt heat number back to the EN 10204 3.1 Mill Test Certificate (MTC).

Our precision-machined C61400 round discs are expertly prepped to serve as the structural starting block for several critical pressure vessel components:

1. Impingement Plates (Anti-Erosion Shunts): Mounted directly beneath the shell-side inlet nozzle to absorb the raw kinetic energy of incoming fluids, protecting the underlying tube bundle from fluid impact erosion.

2. Compact Marine Tubesheets: Drilled and grooved to anchor heat exchanger tubes securely while acting as the corrosion-proof barrier between the shell-side and tube-side liquids.

3. End Cover Flanges & Blind Plates: Drilled with standard pitch circle bolt patterns to seal channel bonnets or access portals in high-salinity offshore piping systems.

4. Anti-Galling Backing Rings: Placed behind loose backing flanges to ensure uniform gasket bolt-load retention over extended thermal cycling periods.

According to TEMA (Tubular Exchanger Manufacturers Association) engineering standards, an inlet impingement plate is legally required whenever the shell-side entrance velocity exceeds the maximum erosional velocity threshold of the tube material, or when dealing with two-phase (gas plus liquid) flows.

Utilizing C61400 aluminum bronze for these protective shields ensures the component will not thin out prematurely, safely diverting the fluid stream and distributing it evenly across the tube matrix to minimize localized pressure drops.

• C61400 Aluminum Bronze: Offers the highest overall strength and outstanding erosion resistance. It is the cost-efficient, premium choice for high-velocity impact shielding and structural components.

• C46400 Naval Brass: Provides moderate strength and good general corrosion defense. Typically reserved for lower-velocity, budget-conscious freshwater or standard seawater tubesheets.

• C70600 (90/10 Copper-Nickel): Features excellent anti-fouling capabilities and premium corrosion protection. Excellent for heat exchanger tubing lines, but has lower mechanical strength than aluminum bronze.

• C71500 (70/30 Copper-Nickel): Delivers high strength and premium corrosion properties. Outstanding for high-speed marine runs, but commands a significantly higher raw material market price.

Streamline your logistics by bundling your raw discs with matching heat exchanger tubing and shell components:

• Alloy Exchanger Tubing: High-performance C70600 (90/10 Cu-Ni), C71500 (70/30 Cu-Ni), and seamless carbon steel tubes cut exactly to your bundle lengths.

• CNC Drilled Components: Full fabrication options where we transform our raw blanks into completely drilled tubesheets or segment baffles per your CAD layout drawings.

• Hardware and Ancillaries: Custom tie-rods, positioning spacers, high-tensile alloy studs, and custom sealing gaskets.

Reduce your drydock or maintenance turnaround time. Send your exact dimensional requests, PDF drawings, or engineering specifications to our international support division:

📧 Email: jimmy@steelseamlesspipe.com

Please specify the following details for a rapid technical appraisal:

• Target Outer Diameter (OD) and finished plate thickness requirements.

• The intended downstream application (e.g., raw blank for machining, finished drilled tubesheet, or ready-to-mount impingement plate).

• Total piece count needed for your emergency maintenance repair or scheduled production run.

Our engineering and heavy machining facility will provide detailed pricing and a production timeline layout within 48 hours.