7Mn15 non-magnetic die steel
7Mn15Cr2Al13V2WMo non-magnetic die steel, referred to as 7Mn15 non-magnetic die steel, is a high strength Austenitic shape non-magnetic die steel, in various states can maintain stable austenite, and has a very low permeability, high temperature strength and hardness, and high wear resistance, but the steel workability is poor, the need for high temperature annealing, change Particle size and distribution of carbides. Adopting gas nitrocarburizing heat treatment can further improve the surface hardness and wear resistance, and thus prolong the service life of the die.
|
steel grade
|
|
C
|
Si
|
Cr
|
Mo
|
Al
|
P
|
S
|
V
|
W
|
Mn
|
|
7Mn15
|
|
0.65~0.75
|
≤0.80
|
2.0~2.5
|
0.5~0.8
|
2.3~3.3
|
≤0.03
|
≤0.03
|
1.5~2.0
|
0.5~0.8
|
14.5~16.5
|
Mechanical properties of domestic die steel 7Mn15 the physical properties of 7Mn15 steel are shown in table, and its density is 7.85t/m& &: sup3。 Coefficient of linear expansion of 7Mn15 steel.
| temperature/℃ |
25～100 |
25～200 |
25～300 |
25～400 |
25～500 |
25～600 |
25～800 |
| Coefficient of linear expansion. |
16.0 |
17.8 |
18.9 |
19.7 |
20.3 |
20.8 |
21.6 |
Thermal conductivity of 7Mn15 steel.
| temperature/℃ |
150 |
300 |
400 |
500 |
600 |
900 |
| Heat conductivity λ/w (m k)-1. |
14.4 |
15.7 |
19.5 |
20 |
20.3 |
24.8 |
The resistivity of 7Mn15 steel.
|
|
150 |
300 |
400 |
500 |
600 |
700 |
| Resistivity/ω m |
1.05×10-6 |
1.15×10-6 |
1.17×10-6 |
1.23×10-6 |
1.25×10-6 |
1.31×10-6 |
7Mn15 delivery status. The goods shall be delivered in heat treatment (normalizing, annealing or tempering at high temperature) or without heat treatment, and the delivery status shall be indicated in the contract. Example of use of 7Mn15. The use of 7Mn15 non-magnetic die steel is as follows: 1) It is used to make nonmagnetic molds in electronic industry. 2) The service life of this steel is about 3 times longer than that of high manganese austenitic steel. 3) It can also be used for hot working dies working at 700 ~ 800 C. 4) It is suitable for non-magnetic cold working dies and plastic dies.
7Mn15 spot specifications.
7Mn15 round bar: hair bar φ 20, forging circle, etc. shall be made to non-standard;
7Mn15 plate:, complete specifications, sufficient stock, accept non-standard custom-made.
