50NHS rod, wire, pipe
Relevance
Rod, pipe 50NHS are widely used in a modern industry at manufacturing transformer cores, microphones, components of computer memory, magnetic antennas, details for electric machines, magnet cores which are intended to be exploited in sea water.
Technical characteristics
Extra-pure ferromagnet iron, siliceous low-coercive precision alloys on a iron-nickel or iron basis that alloyed with silicon and magnet relate to this soft-magnetic alloys. Ferromagnet, ferrimagnet, powdered and compositional materials also belong to this category. Possessing a high magnitude of initial permeability, soft-magnetic materials can magnetize to saturation on weak fields. Such alloys are melted in special metallurgical furnaces for obtaining required shapes, exposing their ingots to malleating and rolling in future. They are utilized in electric machine industry, transformer, radio engineering, magnet cores of a variable magnetic field, an electrotechnical sphere of industry, automation systems, teleautomatics and computationally measuring equipment.
Manufacture
Percentage composition according to GOST 10 994 — 74
| Si |
Cu |
Ni |
S |
P |
Mn |
Fe |
C |
Cr |
| 1.1 — 1.4 |
≤ 0.2 |
49.5 — 51 |
≤0,02 |
≤0,02 |
0.6 — 1.1 |
42.03 — 45 |
≤0.03 |
3.8 — 4.2 |
Iron-nickel alloys are smelted in an open arc furnace. They possess a small variation of electrical resistance (not more than 5%), which are defined by force and existent magnetic orientation. This alloy must be alloyed with such elements as cuprum, mangan, silicon for strengthening the electromagnetic properties. A smelt is done in a vacuum or inert gas environment. Semi-fabricates of minimal thickness are manufactured with a method of cold-rolled stamping with further annealing. It is done for increasing magnetic properties. Permalloy of this grade has improved features and an increased magnetizing. This alloy is characterized by a significant magnetic sensitivity in relation to external changes.
Mechanical properties at a temperature 20 °C.
| Products |
Heat treating |
Diameter |
y |
KCU |
d5 |
sT |
sv |
F.e. |
Heat treating |
| Tube |
Annealing temperature: |
mm |
% |
kJ/m2 |
|
MPa |
MPa |
|
|
| Annealing |
450−550°С |
25 |
|
|
|
455 |
650 |
|
annealing |
Physical characteristics
| Description |
Identification |
| Modulus of elasticity of first kind [MPa] |
E |
| Heating capacity of material (or coefficient of conductivity for heat) [V/(m/degree] |
l |
| Required temperature for obtaining of actual features [Degree] |
T |
| Linear expansion thermal coefficient [1/degree] (range of temperatures 20°С) |
a |
| Specific electrical resistivity [Оhm-mm2/m] 0,81 |
R |
| Density of a material, [kg/m3] |
r |
| Specific heat of a material [J/(kg/degree)] (range of temperature 20°С) |
C |
Soft-magnetic precision alloy of 50NHS grade is used for manufacturing communication equipment of audio and high frequency. It is also utilized for cores of pulsing transformers that work without magnetizing.
Magnetic characteristics
| Description |
Identification |
| Coercive field (not higher) [A/m] |
Hc |
| Magnetical inductive capacity (not higher) [mH/m] |
Umax |
| Saturation induction 2 T [V/kg] |
P1.0/50 |
| Magnetic T induction, magnetic field strength no less than 100, in magnetic field [A/m] |
B100 |
Mechanical characteristics
| Description |
Identification |
| Short resistance to rupture [MPa] |
sv |
| Flow limit (proportional limit load) for permanent change of form [MPa] |
sT |
| Percent elongation at fracture [ % ] |
d5 |
| Contraction ratio [ % ] |
y |
| Impact hardness [ kJ/m2] |
KCU |
| Brinell hardness [MPa]-1 125−195 |
HB |
Welding:
| Type |
Description |
| limitedly weldable |
welding is possible at heating to 100−120°С and last heat treating |
| hardly weldable |
in order to obtain a qualitative welded joints, it is necessary to perform the following operations: while welding to heat it up to 200−300°C, heat treating (annealing) after welding |
| weldblea without stint |
welding is done without further heat treating or previous heating |
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