I. Core Functions of the Equipment

1. Online hot repair of refractory lining for RH dip tubes (snorkels)

   RH dip tubes are constantly immersed in molten steel and subjected to high-temperature thermal shock, molten steel scouring and slag corrosion, which causes spalling, thinning, pits and cracks on the refractory lining. This machine sprays refractory gunning materials under high pressure to rapidly repair the lining and restore its wall thickness.

2. Extend the service life of dip tubes and reduce furnace shutdown replacement frequency

   The dip tubes do not need to be removed for online hot repair, which greatly cuts spare parts consumption and downtime.

3. Simultaneous inner and outer double-layer gunning

   Equipped with inner and outer gunning pipes, it can comprehensively repair the refractory layers on both inner and outer walls of dip tubes, matching the structure of RH double dip tubes.

4. Multi-dimensional precise motion adjustment

   Multi-axis linkage including platform rotation, gunning pipe telescoping, lifting and rotating, realizing full coverage of all damaged areas of dip tubes without dead angles.

5. Stable delivery of dry refractory gunning materials

   The delivery rate is adjustable to guarantee the bonding strength of gunning materials, lower rebound loss and save refractory materials.

II. Application Scenarios (Steelmaking & Metallurgy Industry)

1. Applicable Equipment

All types of RH vacuum circulation degassing refining furnaces (RH Degasser) in steel plants equipped with two dip tubes (up-tube and down-tube).

2. Working Conditions

Online Hot Maintenance (Main Application)

Hot gunning can be carried out directly during the production interval of RH furnaces without full cooling, eliminating long cooling waiting time and shortening production downtime.

Offline Cold Repair

After dip tubes are removed from the furnace, the whole refractory lining can be re-sprayed at ambient temperature for dip tube refurbishment.

3. Applicable Steel Production Lines

RH refining processes matched with long-process converter steelmaking and electric furnace steelmaking:

• Production lines for sheet steel, automotive steel, silicon steel and special steel (high requirements for molten steel cleanliness and high RH equipment utilization rate)

• Refining workshops of large and medium-sized private steel mills and state-owned iron & steel groups

4. Repair Targets

Inner and outer refractory linings of RH up dip tubes and down dip tubes, damaged pipe orifices, weld areas suffering scouring, and sections severely eroded by molten slag.