Tape, circle, wire 32NKD - EI630A

International Equivalent

Mark Analogue W. Nr. Aisi Uns En Order
32NK EP475 Delivery from the stock, in stock
32NKD EI630A Delivery from the stock, in stock
32NKA Delivery from the stock, in stock


Precision alloys have unique physical and technical qualities (thermal, elastic, magnetic, electrical) due to the balanced chemical composition, the thoroughness of manufacturing and processing, the absence of unnecessary impurities. This group contains high-alloys based on copper, iron, niobium, nickel and cobalt. Precision alloy 32NKD with the specified TKHR is designed for parts of instruments of the highest precision, for which the temperature range of -60 +100°C requires dimensional constancy. The TKHR in the temperature range of -60 +100°C is up to 1.0 [1/°C].

Mechanical characteristics of the 32NKD alloy. At an alloy temperature of 20 °C.

Product range . Dimension e.g. Size s in y d5 sT KCU Thermal treatment
- - mm MPa % % MPa kJ/m2 -
440-480 38-45 Annealing

Physical characteristics of 32NKD alloy

Grad MPa W/(m-grad) 1/Grad kg/m3 Oh-m-m J/(kg-grad)
T E 10- 5 l a 106 r R 109 C
20 1.44 780

Percentage composition

Mn Si C Ni Co P S Cu
up to 0.4 up to 0.2 up to 0.05 31.5 - 33 3.2 - 4.2 up to 0.015 up to 0.015 0.6 - 0.8
Linear coefficient of thermal expansion αср-10-6 К-1 in the temperature range, °С Type of heat treatment of samples and workpieces
Not more than 1,0 Hardening of samples from the temperature of (840±10)°C, tempering of blanks at the temperature of (315±10)°C, cooling in water, holding for 1 hour, cooling in a container or in a furnace.
Application Technical properties
Alloy precision 32NKD with specified TKHR is designed for parts of devices of the highest precision for which the stability of the sizes in the range of climatic temperatures is required. Alloy in hardened state with a minimum TKHRx1000000 in the temperature range of -60 +100 °C not exceeding 1.0 [1/°C].


Physical properties of the alloy:

Description Designation
- Alloy data acquisition temperature [°C] - 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

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 less), [ 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 - need for preheating to 200-300°C with final heat treatment


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


All 32NKD 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 stocks a wide range of precision alloys at the right price. The price is based on the European base metal rates without additional charges. 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.