GB YG15 Tungsten Carbide (K30–K40)
GB YG15 (GB/T 30892, ISO K30–K40) — 15 % Co tungsten carbide, HRA 89–90. Compare with YG6 and YG10 for stamping dies.
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GB YG6 Tungsten Carbide (K20)
GB YG6 (GB/T 30892, ISO K20) — 6 % Co coarse-grain tungsten carbide, HRA 91–92. Compare with YG10 and YG15 for granulator and wear parts.