information on 8Cr12Mov steel?

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hazna

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Nov 12, 2010
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I've been looking at some sanrenmu knives which I notice use 8Cr12Mov steel. Just wondering how this steel compares to other steels. I notice that the byrd line of knives uses 8Cr13Mov... how would this compare to the 8Cr12Mov?
 
8Cr13MoV should be more corrosion resistant.
Any other property differences will likely be more dependent on the heat treat differences than the differences in composition.
 
hazna said:
I've been looking at some sanrenmu knives which I notice use 8Cr12Mov steel. Just wondering how this steel compares to other steels. I notice that the byrd line of knives uses 8Cr13Mov... how would this compare to the 8Cr12Mov?
Click to expand...

knarfeng said:
8Cr13MoV should be more corrosion resistant.
Any other property differences will likely be more dependent on the heat treat differences than the differences in composition.
Click to expand...


on sanrenmu's website they list 8cr13mov as the blade steel for their knives. the only things i can think of are either the site you are trying to buy your knife from made a mistake, or maybe their older knives used 8cr12 and now they switched to 8cr13.
 
there are some SRM's that use 8cr14mov steel as well, IMO theyre all pretty much the same the corrosion resistance is pretty negligible
 
to my understanding:

8Cr12 = 0.8 carbon + 12% chrome
8Cr13 = 0.8 carbon + 13% chrome
8Cr14 = 0.8 carbon + 14 % chrome
 
I'm not certain of that. Spyderco lists 8Cr13MoV as .8% carbon 13% chromium, but 9Cr18MoV but .95% carbon 16% chromium. Benchmade lists 8Cr14MoV with .75% carbon 14.5% chromium and 9Cr13CoMoV with .85% carbon 13.5% chromium. You might be able to guess the neighborhood, but I don't think you'll be able to guess exactly the content of these "launch code" steels.
 
jimnolimit said:
to my understanding:

8Cr12 = 0.8 carbon + 12% chrome
8Cr13 = 0.8 carbon + 13% chrome
8Cr14 = 0.8 carbon + 14 % chrome
Click to expand...

Yes, that is the correct interpretation of the ID.

Planterz said:
I'm not certain of that. Spyderco lists 8Cr13MoV as .8% carbon 13% chromium, but 9Cr18MoV but .95% carbon 16% chromium. Benchmade lists 8Cr14MoV with .75% carbon 14.5% chromium and 9Cr13CoMoV with .85% carbon 13.5% chromium. You might be able to guess the neighborhood, but I don't think you'll be able to guess exactly the content of these "launch code" steels.
Click to expand...

I think Spyderco has a typo in their chart. After all, they don't actually use this alloy. If you go to the web site of a company that actually produces 9Cr18MoV:
http://machinery.tradepad.net/products-193903-astm-440bgb-9cr18movstainless-steel-plate.html
you will see that the Chromium content is stated as 17-19%, or a nominal of 18.

These names show the nominal composition.
 
Planterz said:
...I don't think you'll be able to guess exactly the content of these "launch code" steels.
Click to expand...
The names of those alloys confirm to Chinese GB steel standard and as such, their content is defined by specification. it's independent from the maker. In theory at least. Often makers list alloy as certain standard spec, but either go slightly outside of the specification ranges or add small amount of another alloying element not in the spec. 9Cr18Mo has C range of 0.95-1.10 according to GB specs.

8Cr12MoV is a strange one. I can't find a single Chinese steel maker or dealer that lists it as their product, only knife makers list it as blade material, which is strange. Some of the sources list it as an equivalent of AISI 420 steel, but alleged Carbon in 8Cr12MoV is 0.8% range while 420 has 0.15-0.40 Carbon.
 
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