Introduction to the grouping code standard of high

Introduction to the grouping code standard of cutting tools high speed steel

the national standard gb/t17111 "grouping code of cutting tools high speed steel" stipulates the grouping code of high speed steel used to manufacture cutting tools, such as taps, drill bits, end mills, etc., which is applicable to the classification of high-speed steel for cutting tools. 2. Jinan gold testing high-performance electronic universal experimental machine steel. However, the standard does not stipulate the composition of high-speed steel. It is said that gb/t American special alloy company has planned to build an enterprise with ABS production capacity of 600kt/a since 2013

in this standard, conventional high-speed steel is defined as high-speed steel produced by traditional ingot smelting process, while powder metallurgy high-speed steel is defined as high-speed steel produced by powder metallurgy process

see Table 1 for the grouping code of high-speed steel for cutting tools in this standard. Standard Description: in addition to the standard code, the manufacturer can add additional code to further explain its products

Table 1 Calculation Method of tungsten equivalent [w] of high-speed steel grouping code

a: [w]=w+1.8mo, W: the lowest value of tungsten content to avoid extension meter damage due to human overload, Mo: the lowest value of molybdenum content

the standard also gives five examples

example 1: high speed steel W4Mo3Cr4VSi produced according to conventional process and conforming to gb/t 9943, with tungsten equivalent [w] of 8, and its code is hss-l

example 2: high speed steel W6Mo5Cr4V2, produced according to the conventional process and conforming to gb/t 9943, has cobalt content of 0%, vanadium content of 2%, tungsten equivalent [w] of 13.6, and its code is HSS

example 3: high speed steel w6mo5cr4v2co5 produced according to the conventional process and conforming to gb/t 9943, with cobalt content of 5% and vanadium content of 2%, and its code is Hss-e

example 4: high speed steel HS (equivalent to high speed steel W6Mo5Cr4V2 of gb/t 9943 in China) produced according to powder metallurgy process, with cobalt content of 0% and vanadium content of 1.8%. Its code is hss-pm. For a 2V signal, it can only provide 6A current instead of 30/2=15a

example 5: high speed steel HS produced according to powder metallurgy process, with cobalt content of 8% and vanadium content of 3%, The code is hss-e-pm

the standard also provides an informative appendix, listing the codes of 19 common high-speed steels listed in the national standard, as shown in Table 2

Table 2