Stainless Hydraulic Oil for Rolling Mill
Overview
Stainless hydraulic oil for rolling mills is a premium-grade lubricant engineered specifically for the extreme conditions of metal rolling operations. Unlike standard hydraulic fluids, it contains specialized additive packages to prevent staining on finished metal products while maintaining performance under heavy loads and thermal stress. Developed to meet the stringent requirements of modern rolling mills, this oil minimizes downtime by resisting sludge formation and maintaining consistent viscosity across wide temperature ranges. Its formulation typically includes zinc-free anti-wear agents to comply with environmental regulations and reduce system corrosion.
Physical and Chemical Properties
The oil's high viscosity index (typically >120) ensures stable film strength during both cold starts and high-temperature operation. Its pour point is usually below -15°C, allowing reliable performance in unheated facilities during winter months. Key chemical properties include neutralization numbers below 0.5 mg KOH/g, indicating minimal acidic degradation products. The fluid demonstrates exceptional demulsibility, separating from water within 30 minutes to prevent emulsion-related failures. Oxidation stability tests (ASTM D943) typically show 3,000+ hours to TAN 2.0, far exceeding conventional hydraulic oils.
Main Applications
Primarily used in the hydraulic systems of tandem rolling mills, Sendzimir mills, and plate rolling equipment where fluid leakage could contaminate metal surfaces. Its non-staining characteristic is critical for stainless steel, aluminum, and copper alloy production. The oil also serves in auxiliary systems including roll bending devices, screw-down mechanisms, and coil handling equipment. Some manufacturers recommend it for high-pressure gearboxes in rolling lines due to its extreme pressure (EP) performance. In continuous casting applications, it protects hydraulic components from water ingress and subsequent corrosion.
Safety and Storage
While not classified as flammable under normal conditions, the oil should be kept away from ignition sources when temperatures exceed 150°C. Bulk storage tanks require nitrogen blanketing to prevent moisture absorption and oxidative degradation. Spill containment measures should follow local regulations for hydrocarbon products. Used oil must be disposed of through licensed recyclers. Personnel handling the product should wear nitrile gloves and safety goggles, especially during system flushing operations where aerosol formation may occur.
B2B Procurement Guide
When sourcing rolling mill hydraulic oil, verify manufacturer certifications with major equipment OEMs like SMS group or Danieli. Request technical data sheets confirming compliance with industry standards such as DIN 51524 Part 2 or ISO 11158 HM. Consider ordering pilot batches for compatibility testing with existing system seals and filters. For mills processing reactive metals, specify chloride and sulfur content below 50 ppm. Delivery terms should include COA (Certificate of Analysis) with current batch test results for viscosity, cleanliness code, and additive levels.
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