JB/T 7161-1993 Heat treatment parts for rock drilling machinery and pneumatic tools

This standard specifies the technical requirements, inspection rules and test methods for heat-treated parts of rock drilling machinery and pneumatic tools. This standard applies to heat-treated parts of rock drilling machinery and pneumatic tools, excluding non-ferrous metal and powder metallurgy heat-treated parts. Where there are no special requirements in product drawings or technical documents, this standard shall be followed. JB/T 7161-1993 Heat-treated parts of rock drilling machinery and pneumatic tools JB/T7161-1993 Standard download decompression password: www.bzxz.net

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Figure 2 Carbon tool steel network carbide rating chart (500×)Level 6
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Figure 3 Pearlite rating chart after annealing of alloy tool steel (500×)Level 1www.bzxz.net
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Alloy tool steel network carbide rating chart (500×)Level 2
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Figure 5 Tool steel martensite rating chart (500×) (fine needle martensite, needle length ≤1.5mm)Level 3
(Needle martensite, needle length>2.5~4mm)Level 2
(Fine needle martensite, needle length>1.5mm)Level 4
(Needle martensite, needle length>46mm)
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