What is 1.3343? Grade 1.3343 is the HSS type steel. HSS refers to high speed steel grade. The grade is defined in the ISO 4957. The molybdenum offers 1.3343 enhanced properties than stainless steel such as UNS Grade S30400, especially more resistance to crevice corrosion and also pitting in chloride atmosphere. 1.3343 grade is a Tungsten Molybdenum type steel. What is DIN EN ISO 4957? 1.3343 is also identified in the standard DIN EN ISO 4957. It is an international standard which specifies tool steels in wrought condition. The scope of the standard covers non-alloy cold-work tool steels, allow cold
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