Tape, circle, wire 50NP - alloy 50

International Equivalent

Mark Analogue W. Nr. Aisi Uns En Order
50NP 50 1.3927 K94840 NiFe50 Delivery from the stock, in stock


Magnetically soft precision alloy 50NP (50H) has increased magnetic permeability and technical saturation induction. It is used for cores of interchamber, power small-size transformers, relays, chokes, parts of magnetic circuits operated without or with small magnetization at high induction. It is a magnetic material having coercivity according to GOST 19 693-74 with induction less than 4 kA/m. It has a high level of initial magnetic permeability, is magnetized to saturation in weak fields due to its balanced composition.

Percentage composition according to GOST 10 994- - 74

Mn Si C Ni Fe P S Cu
0.3 - 0.6 0.15 - 0.3 up to 0.03 49,0-50,5 48.33 - 50.55 to 0.02 up to 0.02 up to 0.2

Mechanical properties of 50NP at 20oC.

Range Type. Size d5 sT s in KCU y Heat treatment.
Tape, GOST 10 160-75 35 145 440 60
- - mm % MPa MPa kJ/m2 % -
Nailed tape, GOST 10 160-75 3 685 780 15


Physical properties of the alloy:

Description Designation
- Alloy data acquisition temperature [Grad] - T
- Modulus of elasticity of the 1st kind, [MPa] - E
- Coefficient of thermal linear expansion (at 20°C), [1/Grad] -a
- Specific electrical resistance [Ohm-m] -R -R
- Specific gravity [g/cm3] -r -r
- Heat transfer coefficient [W/(m-grad)] -l -l
- Specific heat capacity (at 20°C), [J/(kg-grad) -C

Mechanical properties:

Description Designation
- Ultimate yield strength (yield strength for permanent deformation) [MPa] sT
- Tensile strength [MPa] sT
- Ratio constriction [ % ] y
- Tensile elongation [ % ] d5
- Brinell hardness, in [MPa] HB
- Impact toughness [ kJ/m2 ] KCU


Designation Description
limited weldable - Must be preheated to 100-120°C with subsequent heat treatment
no restrictions - No need for preheating and final heat treatment
Difficult to weld - Preheating to 200-300°C with subsequent heat treatment is required


Magnetically soft alloys are melted in special metallurgical furnaces using a charge of particular purity and are rolled or forged after cooling. The group of magnetically soft materials includes especially pure ferromagnetic iron, electrical low-carbon (unalloyed and siliconized) steels, low-coercive precision alloys based on iron-nickel, composite powder ferroalloys. They find the widest application in modern industry.


Production of transformers, radio and electrotechnical equipment, automation systems, telemetry, computer engineering. Manufacturing of microphone cores, transformers, electronic memory components, magnetic cores for operation in sea water, magnetic antennas and parts for electrical machines. Used in innovative technology, precision machine tool engineering, household appliances, precision electronics manufacturing, laser technology, and for metrology equipment.


All 50NP grade products are certified. The technical documentation includes data on the chemical composition, the limiting percentage of impurities; mechanical properties of the products. From us you can buy in bulk a variety of semi-finished products for large-scale production. We also offer good conditions for retail buyers. You will be satisfied with the level of service and responsiveness of service.

Buy at the best price

Evek GmbH has a wide range of precision steel in stock. The price is formed taking into account the European rates for base metals without including additional costs. The certificate of quality includes data on chemical composition, maximum percentage of impurities and mechanical properties. Cooperation with us provides a number of advantages. Our specialists will be happy to advise you on the purchase of products, the correct choice of which will depend on the performance and durability of the equipment. We will help to determine not only the optimal parameters of the product, but also offer the best price.