FOUR DIGIT ALLOY NUMBERING SYSTEM
Note: Alloying elements are in weight percent, XX denotes carbon content.
10xx |
Basic plain carbon steels |
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 1964) |
33xx |
3.50 nickel & 1.50 Chromium (series deleted in 1964) |
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 |
3.50 nickel, & 0.25 molybdenum |
50xx |
0.40 chromium |
51xx |
0.80 - 1.00 chromium |
5xxxx |
1.04 carbon & 1.03 or 1.45 chromium |
61xx |
0.60 or 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 & 0.25 molybdenum |
88xx |
0.55 nickel, 0.50 chromium & 0.35 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 1964) |
TOOL STEEL NUMBERING SYSTEM
W |
Water hardening |
S |
Shock-resisting |
O |
Oil-Hardening |
A |
Air-hardening |
D |
High-carbon, high-chromium |
H |
Hot-work |
H1- H19 |
Chromium base |
H20 - H39 |
Tungsten base |
H40 - H59 |
Molybdenum base |
T |
Tungsten based "high-speed" |
M |
Molybdenum based "high-speed" |
P |
Mold steel |
L |
Low-alloy |
F |
Carbon-tungsten |
EFFECT OF ALLOYING ELEMENTS ON STEEL
Aluminum
|
Deoxidizes and restricts grain growth |
Boron |
Increases hardenability |
Carbon |
Increases hardenability and strength |
Chromium |
Increases corrosion resistance, hardenability and wear resistance |
Lead |
Increases machineability |
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, machineability, 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 raises hot strength and hot-hardness |
Vanadium |
Increases hardenability |
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