Professional CCM

Water-Cooled Protection Screen‌

The water-cooled protection screen is manufactured from boiler steel, stainless steel, and forged copper plates, with boiler steel and stainless steel being the primary materials formed through stamping and welding processes.

As a crucial component in submerged arc furnaces for producing ferroalloys, industrial silicon, calcium carbide, yellow phosphorus and similar materials, this cylindrical device protects the electrode holder system. Typically, the cylindrical protection screen consists of multiple identical sub-screen units arranged to correspond with surrounding copper segments and pressure rings, facilitating maintenance.

The operating environment for submerged arc furnace water-cooled protection screens is extremely harsh, enduring:

• Continuous exposure to high-temperature corrosive gases

• Strong magnetic fields

• Thermal radiation from charge surfaces at 1000-1400°C
  These conditions frequently lead to severe deformation or water leakage from cracks during operation. Our manufacturing process comprehensively addresses these challenges by overcoming stress deformation and work hardening, significantly improving product lifespan.

‌Material Characteristics of Stainless Steel Protection Screen:‌

► ‌Corrosion Resistance:‌
Stainless steel contains alloy elements such as chromium (Cr) and nickel (Ni). Chromium forms a dense chromium oxide (Cr₂O₃) protective film on the surface. This film is highly stable, preventing oxygen, moisture and other corrosive media (including high-temperature harmful gases in submerged arc furnace environments that may contain corrosive gases like sulfur dioxide and hydrogen sulfide) from penetrating the stainless steel matrix. For example, in chloride-containing environments, ordinary carbon steel corrodes easily, while stainless steel effectively resists chloride ion corrosion due to its protective film. Nickel further enhances corrosion resistance, maintaining stability in broader chemical environments. In complex industrial settings with multiple coexisting corrosive substances, stainless steel ensures long-term performance without corrosion-induced degradation.

► ‌High Temperature Resistance:‌
Stainless steel has relatively high melting points and thermal stability. In submerged arc furnace applications, the protection screen withstands 1000-1400°C radiation from material surfaces without melting or excessive softening. Its crystal structure maintains strength and stability at high temperatures, effectively blocking heat damage to the electrode holder system. Compared to low-melting-point metals, stainless steel demonstrates superior oxidation resistance at high temperatures, preventing rapid oxidation and scaling during prolonged exposure. This maintains the protection screen's integrity and ensures continuous protective functionality.

► ‌Excellent Mechanical Properties:‌
Stainless steel offers relatively high strength and hardness, withstanding external impacts and pressure. During submerged arc furnace operation, forces from material movement and electrode operation may act on the protection screen. Stainless steel effectively resists these forces, preventing damage from collisions or compression. The material also demonstrates good toughness - when subjected to deformation forces, it resists fracture. For instance, minor installation impacts or unexpected operational forces can be absorbed through the material's inherent toughness, minimizing damage potential.

► ‌Hygienic and Easy Cleaning:‌
In industrial environments with strict hygiene requirements, stainless steel's hygienic properties are significant advantages. Its smooth surface resists bacterial and mold growth. For submerged arc furnace protection screens, this helps maintain clean working conditions and reduces potential issues from microbial growth. Stainless steel protection screens are also relatively easy to clean - surface contaminants like dust and oil stains can be removed easily with common cleaners and tools, maintaining optimal appearance and performance.

► ‌Non-Magnetic or Weakly Magnetic (Certain Stainless Steel Grades):‌
Some stainless steel materials are non-magnetic or weakly magnetic. In submerged arc furnaces' strong magnetic fields, this property prevents magnetic interference that could affect normal functionality. For example, it won't magnetically attract surrounding metal particles nor experience additional stress or deformation from magnetic fields, ensuring the protection screen's stability and reliability.