Relation between hardness and bending strength
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Posted by: snapper ®

03/20/2007, 02:33:23

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Hi,

I have a thin blade made of SUS 304 with the hardness of 550-750 N/mm2 and SUS 301 with the hardness of 1500 - 1700 N/mm2. I found out that 304 is easily bend if we compare it with 301. Kindly please advise me is there any relation between hardness and the bending strength.








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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 ®
Barney
03/25/2007, 11:09:02

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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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