C 0.9 Mn 0.3 Si 0.3 Cr 0.3 Ni 0.5

wnease

wnease

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Apr 22, 2004
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C 0.90 Mn 0.300 Si 0.315 Cr 0.276 Ni 0.549

If anyone knows what this is please share! I was thinking of heat treating as 1095. Do the extra alloying elements ask for a longer soak or higher austenitizing temp?

Thanks
 
There is a number of steels in the japanese industrial standard that are close in composition. Here are some guesses:
Sorry about the formatting, if you copy and paste into some text editor with monospaced fonts you should see it well aligned

C Si Mn P S Cr Mo Ni V Tu other
SK 1 1,30-1,50 max. 0.35 max. 0.50 max. 0.030 max. 0.030 max. 0.30 max. 0.25 Cu max.0.25
SK 2 1,10-1,30 max. 0.35 max. 0.50 max. 0.030 max. 0.030 max. 0.30 max. 0.25 Cu max.0.25
SK 3 1,00-1,10 max. 0.35 max. 0.50 max. 0.030 max. 0.030 max. 0.30 max. 0.25 Cu max.0.25
SK 4 0,90-1,00 max. 0.35 max. 0.50 max. 0.030 max. 0.030 max. 0.30 max. 0.25 Cu max.0.25
SK 5 0,80-0,90 max. 0.35 max. 0.50 max. 0.030 max. 0.030 max. 0.30 max. 0.25 Cu max.0.25
SK 6 0,70-0,80 max. 0.35 max. 0.50 max. 0.030 max. 0.030 max. 0.30 max. 0.25 Cu max.0.25
SK 7 0,60-0,70 max. 0.35 max. 0.50 max. 0.030 max. 0.030 max. 0.30 max. 0.25 Cu max.0.25
SKS 5 0.75-0.85 max. 0.35 max. 0.50 max. 0.030 max. 0.030 0.20-0.50 0.70-1.30 Cu max.0.25
SKS 51 0.75-0.85 max. 0.35 max. 0.50 max. 0.030 max. 0.030 0.20-0.50 1.30-2.00 Cu max.0.25
 
I see that in an older post you mentioned that steel came from a saw blade. SKS 5 is used for that. Other than a slightly lower amount of carbon it looks like the most likely match. I would HT it as such. The alloy content is fairly low so I do not expect it to need a long soak. Just guessing.
 
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hi wnease

some modified chinese t10 has the 0.6~1%ni, which is close to your composition. these kind modified type are usually produced for export orders. that 0.6%Ni will increasing strength without lower the toughness and plasiticity. and will lower the Ac1 and Ms temperature a little bit, but not significant enough to effect heat treating such thin object like a knife. your steel's Ac1 should be arround 720~730°C，Acm800°C, Ms should be arround 160°C.

and yes i believe you can simplely treat it like 1095. maybe try salt bath to get some low bainite since ideally Ni can somewhat strengthen ferrite. though i don't know if it worth the time and effort for the Ni which amount as low as 0.5%.

anyway, good luck man.
 
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