... liquilds gas dusts are present, such as petroleum industy,chemical industry, power generation,railroad,and mining ects.These tools can avoid ... . There is two kinds of material, Beryllium Copper alloy and Aluminium Bronze.Special tools. 45# steel, 40Cr.Non-magnetic tools. ... corrosion 2) Mainly used in medical apparatus and instruments, food industry ect. 3) Weakness: Low strength, low hardness. HRC<10° ...