Material Introduction, Magnetic Permeability Test Standard & Cleanroom Usage Specification For Medical Non-magnetic Clinch Nuts

Material Introduction, Magnetic Permeability Test Standard & Cleanroom Usage Specification For Medical Non-magnetic Clinch Nuts

MRI nuclear magnetic resonance imaging is extremely sensitive to metal magnetism. Slightly magnetic clinch nuts inside sheet metal cause image distortion and scanning artifacts. Ordinary SUS316 steel gets magnetized after stamping due to lattice deformation, only low-silicon controlled magnetic SUS316L raw material meets medical MRI standards.

1. Core Performance Comparison Between Ordinary SUS316 & Medical Low-magnetic SUS316L Clinch Nuts

2. Mandatory Cleanroom Production Rules For Medical Non-magnetic Clinch Parts

1. Forming craft: Low-speed static pressing only, high-speed impact stamping forbidden to prevent magnetic lattice deformation; 2. Cleaning process: 3-stage ultrasonic degreasing + multi-stage pure water rinsing, vacuum low-temperature drying to eliminate residual oil contaminating dust-free workshop; 3. Passivation craft: Medical chrome-free passivation without heavy metal precipitation, compliant with medical device contact safety standard; 4. Packaging control: Independent vacuum sealed bags per size with dust-free desiccant to avoid secondary magnetization by iron dust during storage.

3. Common Purchasing Pitfall Avoidance Tips

1. Ordinary SUS316 clinch parts cannot replace low-magnetic SUS316L if drawings mark MRI supporting equipment; 2. Reject non-magnetic clinch parts without batch magnetic permeability test report from supplier; 3. Separate storage away from carbon steel and iron tooling to prevent secondary magnetization from adsorbed iron debris.