Custom Centrifugal Casting Stainless Steel Sink Rollers for Galvanizing Lines
Product Overview:
At the heart of every Continuous Galvanizing Line (CGL) is the zinc pot—a brutal environment where molten metal temperatures exceed 450°C. The sink roller sits entirely submerged in this bath, tasked with guiding the fast-moving steel strip under immense tension. Standard cast rollers quickly fail here: they suffer from thermal fatigue, extreme abrasive wear from the steel strip, and most devastatingly, "dross buildup" (zinc-iron compounds welding to the roller face), which instantly ruins the surface quality of the galvanized sheet. AstraRoll sets the industry standard with our Custom Centrifugal Cast Sink Rollers. By utilizing horizontal centrifugal casting, we produce a stainless steel roller body with unparalleled metallic density and zero internal porosity. To combat molten metal attack, each Industrial Stainless Steel Sink Roller is coated with aerospace-grade tungsten carbide and precision-grooved to actively channel molten zinc away from the contact patch. The result is a vibration-free, highly durable sink roll that dramatically extends your zinc pot campaigns and ensures a flawless, mirror-like galvanized finish on your steel coils.
Roll Function: Heat Transfer Rollers
Industry Applications: Industry
Inquiry Email: sales@astraroll.com
Custom Centrifugal Casting Stainless Steel Sink Rollers for Galvanizing Lines Details
The AstraRoll Technical Advantage
Manufacturing a roll that can survive submerged in molten metal requires absolute metallurgical mastery:
Defect-Free Centrifugal Casting: Traditional sand-cast rollers suffer from micro-shrinkage and gas porosity, which act as failure points under extreme heat. Our centrifugal casting process spins the molten stainless steel at high G-forces, driving impurities to the inner bore and creating an incredibly dense, uniform, and structurally superior outer shell.
Anti-Dross Tungsten Carbide Hardfacing: To prevent molten zinc from reacting with the steel roller, we apply a high-velocity oxygen fuel (HVOF) Tungsten Carbide-Cobalt (WC-Co) coating. This creates a "non-wetting" surface with a hardness exceeding 1000 HV, completely preventing dross adhesion and extending the roll's lifespan by months.
Precision Fluid Dynamic Grooving: At line speeds of 150+ meters per minute, molten zinc can act like water under a tire, causing the steel strip to hydroplane and slip. Our custom spiral and V-groove geometries efficiently squeeze the molten zinc out from under the strip, ensuring perfect traction and tracking.
High-Temperature Dynamic Balancing: A vibrating sink roll will create ripple defects (chatter marks) on the galvanized sheet. We dynamically balance every roller to strict ISO G2.5 standards, compensating for the thermal expansion it will experience in the 460°C zinc bath.
Key Specifications
Please note: AstraRoll sink rollers are 100% custom-engineered to match your specific galvanizing line speed, strip tension, and pot dimensions.
Manufacturing Method: Horizontal Centrifugal Casting (Barrel) + Static Casting (Trunnions).
Base Materials: 316L, 310S, HK40, HT50, or client-specified superalloys.
Surface Coating: HVOF Tungsten Carbide (WC-Co) or specialized Cermet coatings.
Standard Outer Diameter (O.D.): 400 mm to 900 mm+ (Customizable).
Overall Length: Up to 4,000mm.
Operating Temperature: 450°C to 700°C (Zinc, Aluminum-Zinc, and Aluminizing baths).
Groove Pitch & Depth: Custom CNC machined based on line speed and strip thickness.
Why Choose AstraRoll?
1. Complete Zinc Pot Hardware Solutions
AstraRoll doesn't just manufacture the primary sink roller. We engineer and supply the complete submerged hardware assembly, including the Stabilizing Rolls, Correcting Rolls, and the heavy-duty Support Arms and Bushings. Procuring the entire set from AstraRoll guarantees perfect metallurgical compatibility and flawless alignment within your zinc pot.
2. Turnkey Recovering & Re-Coating Services
When a sink roll reaches the end of its campaign, the core is often still structurally sound. Do not scrap it. Ship the worn Industrial Stainless Steel Sink Roller to AstraRoll facilities. We will strip the degraded carbide, re-machine the grooving profile, re-apply the HVOF tungsten carbide coating, and re-balance the roll, returning it to OEM specifications at a fraction of the cost of a new roll.
Frequently Asked Questions (FAQs)
Q: Why is Centrifugal Casting better than Forging for a sink roll?
A: While forging creates strong metal, it is incredibly expensive and difficult to forge the large, hollow cylindrical shapes required for sink rolls. Centrifugal casting provides a near-forged metallurgical density in a seamless, hollow tubular shape, offering the perfect balance of extreme high-temperature strength, low rotational inertia, and cost-effectiveness.
Q: Do the sink rolls come pre-heated or ready to submerge?
A: The rolls are shipped at ambient temperature. It is critical that your metallurgical team follows a strict, gradual pre-heating protocol (typically in a specialized pre-heat oven) before slowly lowering the roll into the molten zinc pot. Rapid thermal shock can crack the tungsten carbide coating.
Q: Can you customize the groove pattern for high-speed aluminizing lines?
A: Yes. Aluminizing baths operate at higher temperatures and possess different fluid dynamics than standard zinc baths. Our CNC department will cut specific bi-directional or variable-pitch spiral grooves optimized exactly for your coating alloy and line speed to ensure optimal fluid displacement.
Q1. Are you a trader or direct factory?
We are a direct manufacturing factory with over 20 years of expertise in high-end industrial rollers, casters and material handling solutions. Our facility operates with ISO-certified quality management systems, allowing us to maintain full control over production cycles and quality standards. Throughout two decades of growth, we have established deep, long-term strategic partnerships with several listed companies and global automation leaders, proving our reliability as a high-tier industrial supplier.
Q2. What are your main products?
AstraRoll specializes in the engineering and production of three core product lines: Industrial Rollers, Heavy-Duty Wheels, and Precision Casters. We do not just sell components; we provide integrated movement and transport solutions. Our products are widely utilized across high-demand sectors, including: New Energy, Lithium Battery, Mining, Heavy Industry, Medical Institutional, Agriculture and Logistics.
Q3. What about delivery time?
We deeply understand that project timelines are critical.
Standard Products: Usually dispatched within 7–15 working days if the components are in stock.
Customized/OEM Orders: Depending on the complexity and volume, the lead time typically ranges from 20–35 days. This includes time for technical drawing confirmation, specialized tooling, and rigorous pre-shipment testing.
Shipping Methods: We offer flexible global logistics solutions, including FOB and CIF terms. We ship via Sea Freight (for bulk industrial orders), Air Freight (for urgent project needs), and International Express (DHL/FedEx/TNT) for smaller components or samples.
Q4. How can I get a quote for customized products?
Since a significant portion of our business involves specialized engineering, pricing is tailored to your specific technical requirements. To provide an accurate quote, please provide the following details: Technical Drawings or Sketches, Application Environment, Quantity, Special Requests. Our engineering team typically reviews and responds to custom inquiries with a formal quotation within 24–48 hours.
Q5. What is your payment?
TT / Paypal / Western Union / LC / Credit Card etc. are all available to us.
