Abstract: A stainless steel with a yield strength of 2,200 MPa or more is disclosed through the generation of the strain-induced martensite phase and the increase of the martensite phase strength. A high strength stainless steel according to an embodiment of present disclosure includes, in percent (%) by weight of the entire composition, C: 0.14 to 0.20%, Si: 0.8 to 1.0%, Mn: more than 0 and 0.5% or less, Cr: 15.0 to 17.0%, Ni: 4.0 to 5.0%, Mo: 0.6 to 0.8%, Cu: 0.5% or less, N: 0.05 to 0.11%, the remainder of iron (Fe) and other inevitable impurities, and C+N: 0.25% or more and Md30 value satisfies 40° C. or more.

Abstract: A handheld sanding device according to the present invention includes: a power generation unit configured to generate rotating force for sanding operation; a power transmission unit configured to be coupled to the power generation unit, and to transmit the rotating force generated by the power generation unit; a sanding unit configured to be rotated by the rotating force, transmitted through the power transmission unit, in order to sand a sanding target surface; and a shaft coupling unit configured to connect the power transmission unit and the sanding unit to each other so that the sanding unit is freely inclined based on the power transmission unit, thereby improving the close contact between the sanding target surface and the sanding unit while making it easy to carry and also preventing the sanding target surface from being eccentrically worn during sanding operation.

Abstract: A handheld sanding device according to the present invention includes: a power generation unit configured to generate rotating force for sanding operation; a power transmission unit configured to be coupled to the power generation unit, and to transmit the rotating force generated by the power generation unit; a sanding unit configured to be rotated by the rotating force, transmitted through the power transmission unit, in order to sand a sanding target surface; and a shaft coupling unit configured to connect the power transmission unit and the sanding unit to each other so that the sanding unit is freely inclined based on the power transmission unit, thereby improving the close contact between the sanding target surface and the sanding unit while making it easy to carry and also preventing the sanding target surface from being eccentrically worn during sanding operation.