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Re: Relation between hardness and bending strength
Re: Relation between hardness and bending strength -- snapper	Post Reply	Top of thread	Forum

Posted by: Olly ® 03/25/2007, 11:09:02 Author Profile eMail author Edit

Dear Snapper, you need to know the difference between strenght (tensile resistance) and hardness; often a material with an elevate value of hardness is fragility also, one example is the cast-iron: if you try to blend it...it break. The metal material are classificated as ductile and fragile. Sure a material with an elevate hardness has an elevate tensile resistance (not all are ductile or fragile, because change the molecolar structure, or the % Carbon),[if you have the date in HB (Brinnel hardness) you can considerate about for 3.4 times to convert in tensile strenght (R or Rm) as N/mmsquare, or 1/2 times to convert in tensile strenght (R) as Psi_x1000... an example HB300 x 3.2= R1016 N/mm2 that is = R150 Psi_x1000]. However, the metal resistance date before R or Rm, is Rp or Re: that is the proportional limit of deformation... after this an before firster of R the metal does not more like a spring and keeps (about) the bend. About your metal: SUS304= UNI X5CrNi1810 but SUS301= UNI X12CrNi1707.... X= HIGHT (a lot) ALLOY, ...5 (12)= %CARBON x100, ...CrNi1810 (1707) the 18%Cr+10%Ni...

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