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When value conflicts with "Best"

Posted by oldsailorsknives 
When value conflicts with "Best"
May 05, 2019 10:41AM
On BF, Larrin has been doing a great job collecting and Charpy toughness testing steel samples. Current results [www.bladeforums.com] I was quite surprised that 8670 currently has the highest rating, with Z-Tuff in second. Z-Tuff does have better wear resistance and better stain resistance(not sure by how much as it is only 7.5% chromium.)
8670/BE86/SKS5 is an old tool steel used for saw blades and such, think L6 with less nickel and chrome. Basic heat treat, 800C for 10-15 minutes, quench in oil, two one hour tempers. $19 for steel to make a cleaver/chopper with a 8"x 3" blade with 4" tang.
Z-Tuff is a newer powder steel from Zapp. for steel to make a cleaver/chopper with a 0.21" x 8"x 3" blade with 4" tang.
more later.
scott

scott
[www.etsy.com]
Re: When value conflicts with "Best"
May 05, 2019 12:19PM
Jeremy gets good results with his 8670. Seems to hold up well.

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Always in search of a good choppa'
Re: When value conflicts with "Best"
May 05, 2019 09:04PM
On BF, Larrin has been doing a great job collecting and Charpy toughness testing steel samples. Current results [www.bladeforums.com] I was quite surprised that 8670 currently has the highest rating, with Z-Tuff in second. Z-Tuff does have better wear resistance and better stain resistance(not sure by how much as it is only 7.5% chromium.) Project is a meat chopper/cleaver 8"x 3" x 0.20" blade with 4" tang

8670/BE86/SKS5 is an old tool steel used for saw blades and such, think L6 with less nickel and chrome. Basic heat treat, 800C for 10-15 minutes, quench in oil, two one hour tempers. $19 for steel to make a cleaver/chopper with a 8"x 3" blade with 4" tang. Machinability is probably about the same as W1/1095. Best guess would be $15 in belts, $5 for basic handle with pins, and $65 for 2.5 hours of labor. so total cost of $105, say MSRP of $150.

Z-Tuff is a newer powder steel from Zapp, similar to 3V with an additonal 1.5% Nickel. for steel to make a cleaver/chopper with a 0.21" x 8"x 3" blade with 4" tang cost would be $70. HT would require 2 furnaces, 1st heat to 800C transfer to 2nd furnace at 1050C hold for 20-30 minutes. Quench. 2 2 hour tempers at 1000F. Machinability is probably about 50% of W1/1095. Best guess would be $30 in belts, $5 for handle and pins, and $125 for 5 hours of labor. So total cost of $230. if I do same markup as 8670, MSRP is $325.

So would a consumer pay double just because it says Z-Tuff?
I used 0.20" thickness because that is the thinnest Z-Tuff currently available.

scott
[www.etsy.com]
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