NW-80 is a new type of high-performance, high-hardness, easy-cutting non-magnetic mold steel. It is an improved product of ht non-magnetic mold steel and hpm non-magnetic mold.
New type of easy-cutting, high-hardness austenitic mold steel Bulk non-magnetic mold steel (NW-80)
The continuous development of my country's machinery, electronics, light industry, home appliances and automobile industries is inseparable from the development of mold products. Many important accessories of electronic products, home appliances, motor products, etc. require the use of non-magnetic mold steel processing molds for product production, such as motor bearings, non-magnetic bearings, magnetic rings, ferrite, rare earth constant magnets and other products. There is an important link in the pressing process of producing constant magnet materials (ferrite, rare earth constant magnet), that is, the powder or slurry must be pressed under the action of an external magnetic field with a certain orientation to ensure that the rough parts are processed Good magnetic properties of the parts. To achieve this performance requirement, the mold used to press the constant magnet material blank must have the characteristics of non-magnetic conductivity and no magnetic leakage; in addition, during the blank pressing process, the hardness of the powder or slurry is high (≥50HRC) and the mold loss is serious, which requires The mold or mold surface has high hardness and wear resistance; at the same time, in order to ensure the accuracy and production efficiency of the blank, the mold should also have good demoulding properties. Most foreign countries use powder steel to produce non-magnetic molds, and Cr-Ni? austenitic steel is also used to make molds. The hardness of powder non-magnetic steel can reach HRC 50~60, but it is expensive, difficult to process and expensive to process. The pre-hardened delivery hardness of general Cr-Ni steel is only HB≤210. Or use non-magnetic steel with low hardness such as 1Cr18Ni9Ti to make molds, which has poor wear resistance, difficult processing, short service life, and seriously affects the product production cycle. In order to meet the production needs of the majority of users, after several years of research and development, our company has produced the latest non-magnetic mold steel series code-named NW-80, a high-hardness, high-wear-resistant, easy-cut austenitic austenitic through countless reasonable chemical composition ratios and material performance tests.
Features:
1. The hardness ranges from HRC 25 to 45, giving users a larger range of choices and uses, giving full play to the advantages of steel types, saving costs and improving economic benefits. .
2. It has good heat resistance and high red hardness. It can work at high temperatures of 750 to 800°C for a long time and maintain a certain red hardness. The mechanical properties and wear resistance are good, (see Table 2 for details) 3. Usage characteristics: non-stick scale, heat-resistant, long service life, dimensional stability, no deformation when working under high temperature conditions
IV , Low magnetic permeability: It has the characteristics of non-magnetic conductivity, no magnetic leakage, non-stick products, good demoulding performance, and high product accuracy. (See Table 3 for details)
5. Easy cutting: The processing cost is 60% lower than that of ordinary non-magnetic steel 40Mn18Cr4v, 50Mn18Cr5, 60Mn18Cr5v, 7Mn15Cr2A13V2wmo, etc. (See Table 4 for details)
6. Work hardening properties:
Easy-cutting high-hardness austenitic non-magnetic mold steel (NW-80) is a high-manganese, high-chromium wear-resistant steel , its biggest features are:
(1) The greater the external impact, the hardened wear-resistant layer will be formed on its surface, and the higher the wear resistance.
(2) As the surface hardened layer gradually wears away, new work-hardened layers will continue to form, thereby achieving high wear resistance.
Chemical composition list (1)
C
Si
Mn
P
S
Cr
Ni
Mo
0.45-0.5
0.48-0.5
14.5-15
0.017
0.004
5-5.5
0.22-0.5
0.004
p>
0.1-0.15
Cu
AI
Ti
V
Easy cutting elements
Others Elements
0.045-0.05
0.48-0.5
0.01 -0.02
1.7-2
0.30
Patent
Mechanical property table (2)
HRC after solid solution
HRC after aging
p>
Impact akV/J after solid solution
Impact akV/J after aging
31
40-44
130
20
Relative magnetic permeability μ(3)
Solid solution state
Solid solution aging
1.005
1.015