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Subject on This Issue:
* Steels & Properties
* Heat Treatment


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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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