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Question: i found bhn of 180 which is around 380 mpa...

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An annealed 65-45- 12 cast iron structural member is non-destructively hardness tested. In the hardness test, a 10 mm diameter tungsten carbide sphere created a 4.48 mm diameter impression under a 3000 kg load. What is the yield strength (to 2 significant figures) of the structural member? Please use the chart on PolyLearn showing strength vs. Brinell hardness. Answer: 380 MPa

1200 Grade 120-90-0260 1000 100-70-03, air-quenched 80-55-06, as cast 120 80065-45-12 annealed 600 180 5 400 40 Tensile strength Yield strength 200 60-40-18, annealecd 60 180 200 220 240 260 20 30 Hardness, BHN (b) Tensile properties of ductile iron versus hardness

I found BHN of 180 which is around 380 MPa. I don't know why it is wrong

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