Which type of Q355 profile should be used for the frame of the medical trolley, and why?
Answer: Q355B/C square/round tube profiles (specifications: 20×20mm~40×40mm, wall thickness 1.5-3mm) are preferred. Reasons: Square/round tubes have high structural rigidity and strong load-bearing capacity, suitable for the dynamic load of the medical trolley; the profiles are pre-finished, requiring only cutting and welding during processing, improving production efficiency; the 1.5-3mm wall thickness balances strength and lightweight, making it easy for medical staff to push.
Can Q355 be used for the housing of equipment in a hospital's sterilization supply center?
A: Yes, but two conditions must be met: ① Use Q355C/D grade, which has low sulfur and phosphorus content and better weldability and toughness; ② The shell surface must be electrophoretically coated with a coating thickness ≥60μm to withstand the slight corrosion from high-temperature steam and chlorine-containing disinfectants in the sterilization supply center; if the shell comes into contact with medical fluids, a 304 stainless steel lining is required, and Q355 should only be used for the external load-bearing shell.
In the medical industry, can Q355 replace Q235 for structural components, and what precautions should be taken?
A: It can completely replace Q235, and its performance is superior; note the following three points: ① Q355 has higher strength, so appropriate cutting tools (such as carbide tools) must be used during machining to avoid excessive tool wear; ② Matching welding wire (ER50-6) must be used during welding; Q235 welding materials cannot be used directly; ③ If the original design used Q235, replacing it with Q355 can appropriately reduce the wall thickness, lower the equipment weight, and improve cost-effectiveness.
For medical support supports (such as IV stands and examination equipment stands) in outdoor hospitals, which grade of Q355 stainless steel and surface treatment should be selected?
Answer: Q355D grade with hot-dip galvanizing should be selected. Q355D can withstand outdoor temperature changes of low and high temperatures, and has good toughness and structural stability. The zinc layer thickness of hot-dip galvanizing is ≥85μm, which is resistant to outdoor rain and dust corrosion. The service life of the support is ≥10 years, requiring no frequent maintenance.
What are the core design principles for Q355 structural components used in medical equipment?
Answer: The core principles are **"non-contact with the human body, strength matching, precision compliance, and environmental traceability"**. Specifically: ① All Q355 structural components must not come into direct contact with the human body or medical fluids; ② The strength design must have a sufficient safety factor (generally ≥1.5) to meet the load-bearing, vibration, and impact requirements of long-term equipment use; ③ Dimensional accuracy and geometric tolerances must be adapted to the precision assembly requirements of medical equipment; ④ The entire process must meet environmental protection and traceability requirements, and be compatible with whole-machine certification and quality control.