Terminology question...

Daniel Moore

Daniel Moore

Joined
Jul 28, 2003
Messages
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How is O-1 tool steel officially supposed to be written? I usually write it 0-1 (with a zero) out of habit, but is it supposed O-1 (as in the letter 'o' because it is 'O'il hardened? It's a dumb question, but sometimes it has a hyphen, other times not, sometimes I see it with an 'O' and sometimes with a '0'. :confused:
 
"AISI TYPE 01" is whats written on my flat stocks paper wrapper, not shure if this is the "correct" way though. Also I cannot tell if it is a zero or an O, im shure one of the steel guys can verify the last, but on my steel there is no hyphen.
 
when i look on flatground.com where i have ordered my O1 it is writen 0-1 as numbers

but as bigjim said no idea if it is "proper"
-matt
 
The tool steel designations A2,W2 ,O1,L6 all have meaning .The first is a letter and O1 or O-1 is the letter O [not number] and means OIL hardening .The hyphen is optional !
 
Most people call it ten ninety-five. There may be significane in the pronunciation, because each of the numbers stand for carbon content, and the content of other important elements.
I'll update if I can find something on a quick search, otherwise, it would be much appreciated if Mete, Mr. Cashen, or some other man more knowledeable than I would chime in.

Edited:
Google Search said:
With all of these different alloys, and percent carbon values, a consistent numbering scheme had to be devised to identify the different types of steel. This system is made up of a four (sometimes five) digit number that identifies the dominant alloy and the percent carbon in the steel. In addition, some steels have a letter prefix that specify its manufacturing method. As shown in Figure 3, the first two digits specify the main alloy, and the last two (sometimes three) digits specify the carbon content.
Figure 4 is a table of just some of the steel alloy numbers that a home shop machinist will encounter. For example, 1018 steel has no appreciable alloy content and contains 0.18% carbon. 4140 steel is a chromium-molybdenum steel with 0.40% carbon. And 12L14 steel is a leaded steel with 0.14% carbon. The improved properties of these steels can be found by referring back to Figures 1 and 2 (the chrome-moly in 4140 provides improved hardenability, the lead in 12L14 steel provides improved machinability, and 1018 is a relatively soft low carbon steel).
Click to expand...

Found at http://www.homemetalshopclub.org/news/may99/may99.html

It doesn't say anything about pronunciation, but I figure that by dividing it into "Ten" and "Ninety-five" you get the message clearly across that there is not enough of anything in the steel to make much of a difference (ten), and that it has .95 percent carbon content (Ninety-five).
 
It's 10-95 , because it's the 10xx series and has 95 'points' of carbon [ 0.95 % C ]
 
Cool thread... what does the "51" in 5160 and 51200 stand for? For that matter, what about the "200" in 51200? I sort of doubt it has 20% carbon...
 
The 51xx series has .80 Cr. The proper number is 52100 [not 51200], 1.45 % Cr and 1.00 % C.
 
Peter_E_Ryt said:
Most people call it ten ninety-five. There may be significane in the pronunciation, because each of the numbers stand for carbon content, and the content of other important elements.
I'll update if I can find something on a quick search, otherwise, it would be much appreciated if Mete, Mr. Cashen, or some other man more knowledeable than I would chime in.

Edited:


Found at http://www.homemetalshopclub.org/news/may99/may99.html

It doesn't say anything about pronunciation, but I figure that by dividing it into "Ten" and "Ninety-five" you get the message clearly across that there is not enough of anything in the steel to make much of a difference (ten), and that it has .95 percent carbon content (Ninety-five).
Click to expand...

Dont suppose you have a link listting all the steels and alloy etc numbers handy?
 
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