Make your own free website on Tripod.com


MACHINISTS GUIDES

HOME MACHINISTS GUIDES  
LINKS METALWORKING BOOKS  

 

 

  FOUR DIGIT ALLOY NUMBERING SYSTEMS

WHAT THOSE NUMBERS MEAN WHEN ORDERING STEEL
NOTE: Alloying elements are in weight percent, XX denotes carbon content.

10XX Basic plain carbon steel
11XX Plain carbon steel with high sulfur & low phosphorous (Resulferized)
12XX Plain carbon steel with high sulfur & high phosphorous
13XX 1.75 manganese
23XX 3.50 nickel (series deleted in 1959)
25XX 5.00 nickel (series deleted in 1959)
31XX 1.25 nickel & 0.60 chromium (series deleted in 1959)
33XX 3.50 nickel & 1.50 chromium (series deleted in 1959)
40XX 0.20 - 0.25 molybdenum
41XX 0.50 - 0.95 chromium & 0.12 - 0.30 molybdenum
43XX 1.83 nickel, 0.50 - 0.80 chromium & 0.25 molybdenum
44XX 0.53 molybdenum
46XX 0.85 or 1.83 nickel & 0.23 molybdenum
47XX 1.05 nickel, 0.45 chromium &0.20 - 0.35 molybdenum
48XX 3.5 nickel & 0.25 molybdenum
50XX 0.40 chromium
51XX 0.80 - 1.00 chromium
61XX 0.60 0r 0.95 chromium & 0.13 - 0.15 vanadium
86XX 0.55 nickel, 0.50 chromium & 0.20 molybdenum
87XX 0.55 nickel, 0.50 chromium & .25 molybdenum
88XX 0.55 nickel, 0.50 chromium & .35 molybdenum
92XX 2.00 silicon
93XX 3.25 nickel, 1.20 chromium & 0.12 molybdenum (series deleted in 1959)
98XX 1.00 nickel, 0.80 chromium & 0.25 molybdenum (series deleted in 1959)

 

ALLOYING ELEMENTS

Aluminum Deoxidizes and restricts grain growth
Baron Increases hardenability and strength
Carbon Increases hardenability and strength
Chromium Increases corrosion resistance, hardenability and wear resistance
Lead Increases machinibility
Manganese Increases hardenability and counteracts brittleness from sulfur
Molybdenum Deepens hardening, raises creep strength and hot-hardness, enhances corrosion resistance and increases wear resistance
Nickel Increases strength and toughness
Phosphorus Increases strength, machinability, and corrosion resistance
Silicon Deoxidizes, helps electrical and magnetic properties, improves hardness and oxidation resistance
Titanium Forms carbides, reduces hardness in stainless steels
Tungsten Increases wear resistance and hot hardness
Vanadium Increases hardenability

TO BUY BY CHECK

BACK TO ADVANCED MACHINISTS

BACK TO BASIC MACHINISTS

BACK TO GUIDES

BACK TO HOME SHOP MACHINISTS

 

Send mail to THZABEL@HOTMAIL.COM with questions or comments about this web site.
Copyright 2001 METALWORKING BOOKS
Last modified: November 29, 2001