ThorsHammer82 Posted September 22, 2015 Share Posted September 22, 2015 I picked up probably a dozen pins from the quarry I got my anvils from. I assume they are for holding on bucket teeth or something along those lines. There are some shown in the picture below. on the ground to the right.all I really know is they are HARD! It takes a lot of effort to move the material around. I'm assuming some sort of high carbon steel. but I really don't know for sure. Any suggestions? Quarrydog I'm counting on you here. Quote Link to comment Share on other sites More sharing options...
andys MQ Posted September 23, 2015 Share Posted September 23, 2015 im almost 100% sure they would be a chrome molly alloy making them hard and wear resistant. i guess it would make a good knife being wear resistant.in reality carbon is used but i think you will find things like chrome, nickel and molybdenum have much more effect on the steel then carbon.the problem with carbon in applications today ( in my opinion) is it relys on heat treatment/ tempering to give it the quality's you want. it is easier to just make an alloy that don't need to be temped. It also means that unlike carbon steel it is more permanent. Hardened carbon steel can become annealed for example if exposed to heat.so anyway i think they would be a chrome moly alloy Quote Link to comment Share on other sites More sharing options...
Chris john Posted September 23, 2015 Share Posted September 23, 2015 Maybe bisalloy just a guess they tend to use a bit of it in quarry workChris Quote Link to comment Share on other sites More sharing options...
fergy Posted September 23, 2015 Share Posted September 23, 2015 look like CAT ripper retaining pinsdo they have what looks like a large circlip grove about 1/2 from one end? http://www.groundengagingtools.net.au/product/caterpillar-ripper-pin/ http://catalog.romacparts.com/viewitems/caterpillar-/caterpillar-pins? Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted September 23, 2015 Share Posted September 23, 2015 Try the spark test and try the forge/quench/break test and tell us what you decide! Quote Link to comment Share on other sites More sharing options...
DSW Posted September 23, 2015 Share Posted September 23, 2015 I think you may be confusing "hard" and "tough". "Hard" and "tough" are not necessarily the same thing. Quote Link to comment Share on other sites More sharing options...
ThorsHammer82 Posted September 23, 2015 Author Share Posted September 23, 2015 They have some sort of retention grove on them. but it's not as pronounced as those cat ones. May be why they were discarded.I'd be interested in trying to make a knife out of them, but there is no way I'm doing that without a power hammer.Tough is probably the word I'm looking for. The material just doesn't want to move. I'm not sure when I'll get a forge fired up again, but when I do I'll let you know what effects it has. Quote Link to comment Share on other sites More sharing options...
manolito Posted October 2, 2015 Share Posted October 2, 2015 If they are roller pins they are harder than my wife's heart. Quote Link to comment Share on other sites More sharing options...
ThorsHammer82 Posted October 2, 2015 Author Share Posted October 2, 2015 ouch. that's harsh. Quote Link to comment Share on other sites More sharing options...
Frosty Posted October 2, 2015 Share Posted October 2, 2015 A high moly alloy isn't going to move easily HOT, it's tough stuff and air hardening.Frosty The Lucky Quote Link to comment Share on other sites More sharing options...
BIGGUNDOCTOR Posted October 3, 2015 Share Posted October 3, 2015 I would contact the quarry to find out who manufactures the equipment these pins are used on,then contact that manufacturer. I have found many to be willing to answer questions like this. If you find out post it up for all of us to see. Quote Link to comment Share on other sites More sharing options...
yahoo2 Posted October 6, 2015 Share Posted October 6, 2015 if you could find out the tensile strength grade of the pins it would help.If it is class 12.9 it will be an alloy steelIf it is class 10.9 there is a choice of three options medium carbon steel, medium carbon alloy steel and low carbon boron steel. you should be able to spark test and compare a medium carbon steel and a low carbon boron steel with bits of known steel from your scrap pile. its a cross between educated guess and process of elimination. I daresay you already know its not medium carbon from experience.as for what alloy it might be to meet 12.9 spec, it is not designed to wear or resist abrasion or corrosion so all of those are out of the picture and it is a throw away one use item. the manufacturer is going to keep the costs down, that eliminates all the fancy expensive stuff. There is not a lot of options left. Quote Link to comment Share on other sites More sharing options...
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