?It?s made from N***0 low carbon
alloy-steel, refined and forged by strict chemical analysis to
reach its mechanical properties. It has favorable low-permeability,
high-strength mechanical properties, great splitting properties of
corrosion resistance and excellent abrasion
performance. ? When
MPS=1?*05/4?A/m, its relatively
magnetic permeability?r?1.**0 ? When any distance by the inner
hole is **0mm, its field
gradient?0.*5?T
?
