Ribbon, circle, wire 33NK - EP139

International Equivalent

Mark Analogue W. Nr. Aisi Uns En Order
33NK EP139 Delivery from the stock, in stock


Alloy 33NK with average TKHR (6,0-9,0)-10-6 1/°С in the temperature range from -70 to + 470°C is designed for coupling with mica, ceramic, glass of grade C 72-4. 33NK and 33NK-VI are not allowed to be used in modernized or newly designed equipment since 01.01.91. Melting temperature of the alloy is about 1450 °C. It is referred to high-alloys on the basis of iron, copper, nickel, niobium and cobalt. It has unique physical and technical properties (thermal, elastic, magnetic, electrical), due to its balanced chemical composition, thoroughness of production and processing, absence of unnecessary impurities.


The sphere of innovative technologies, precision instrumentation, manufacture of precision electronic sensors, household appliances, laser optics, measuring metrology equipment, computer memory components, microphone cores, magnetic antennas.

Percentage composition

Si C Fe Mn P S Ni Co
up to 0.3 up to 0.05 48.22 - 51 up to 0.4 up to 0.015 up to 0.015 32.5 - 33.5 16.5 - 17.5

Physical properties of the alloy 33 NK.

MPa Grad 1/Grad J/(kg-grad) kg/m3 W/(m-grad) Ohm-m
E 10- 5 T a 10 6 C r l R 10 9
1.42 20 8200 420

Mechanical properties of alloy 33NK at 20 °C.

Product range Size sT sT in e.g. KCU y d5 Heat treatment.
- mm MPa MPa - kJ/m2 % % -
Tungsten carbide tapes, GOST 14 080-78 930


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-cold)] -C -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

Magnetic properties :

Description Designation
- Coercive force (within) [ A/m] Hc
- Magnetic permeability (not more than) [ MHN/m] Umax
- Losses (not more than) at frequency 50 Hz and 1.0 Tl [ W/kg ] P1.0/50
- Magnetic induction Tl (not less) at magnetic field strength 100, in magnetic fields [ A/m] B100
- Coercive force (not more), [ A/m] Hc
- Magnetic permeability (not more than), [ MHN/m] Umax
- Losses (not more than) at frequency 50 Hz and 1.0 Tl [ W/kg ] P1.0/50


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 final heat treatment necessary


All 33NC grade products are certified. The technical documentation includes data on the chemical composition, the limiting percentage of impurities, the mechanical properties of products. With 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 efficiency of service.

Buy at a reasonable price

Evek GmbH stocks a wide range of precision alloys at the right price. It is formed taking into account European rates for non-ferrous metals without including additional costs. The product quality certificate 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 precision alloys, 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.