20MoCr4 forged alloy steel bar
Category:
Steel Bars
Brief description:
20MoCr4 is an alloy steel primarily used in cold heading and cold extrusion processes. This kind of steel is widely used in machinery manufacturing and automobile industry because of its excellent mechanical properties and processing properties.
Key words:
Product Description
Product Description
20MoCr4 is an alloy steel primarily used in cold heading and cold extrusion processes. This kind of steel is widely used in machinery manufacturing and automobile industry because of its excellent mechanical properties and processing properties.
Steel grades and chemical composition (cast analysis)
|
Steel grade |
% by massa, b, c |
|||||||
|
NAME |
Number |
C |
Si |
Mn |
P |
S |
Cr |
Mo |
|
20MoCr3 |
1.7320 |
0,17 to 0,23 |
max. |
0,60 to 0,90 |
25 |
≤0,035 |
0,40 to 0,70 |
0,30 to 0,40 |
|
20MoCr4 |
1.7321 |
0,17 to 0,23 |
40 |
0,70 to 1,00 |
25 |
≤0,035 |
0,30 to 0,60 |
0,40 to 0.50 |
Hardness limits for steel types with specified (normal) hardenability (+H-grades; see 7.1)
|
Steel grade |
Number |
Limits of |
Hardness HRC at a distance from quenched end of test piece |
||||||||||||
|
20MnCr5+H |
1.7147+H |
max. |
49 |
49 |
48 |
46 |
43 |
42 |
41 |
39 |
37 |
35 |
34 |
33 |
32 |
|
20MoCr4+H |
1.7321+H |
max. |
49 |
47 |
44 |
41 |
38 |
35 |
33 |
31 |
28 |
26 |
25 |
24 |
24 |
The heat treatment process for 20MoCr4 is critical to its performance, including:
· Annealing: soften the material, improve plasticity and remove internal stress.
· Quenching: to improve hardness and strength, the medium can be salt water, water or oil.
Tempering: reduce quenching stress, restore toughness and elasticity.
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