Tape 40KHNM - EI995

International Equivalent

Mark Analogue W. Nr. Aisi Uns En Order
40KHNM EI995 Delivery from the stock, in stock


Grade 40KKHNM belongs to the group of precision alloys with specified elastic properties. It has the most unique physical and mechanical properties (magnetic, thermal, elastic, electrical) due to the accuracy of composition, thoroughness of manufacturing and processing, absence of unnecessary impurities. This group includes high-alloys on the basis of iron and nickel with manganese, copper and other elements.

Percentage composition

Si C Fe Mn P Ni S Mo
1.8 -2.2 to 0.5 10.74 -18.73 15 -17 19 -21 up to 0.02 to 0.02 39 -41

Mechanical properties of the alloy 40KHNM at 20 °C.

Range Range. Size sT sT in y KCU d5 Thermostat.
- - mm MPa MPa % kJ/m2 % -
2400-3000 3200-3800 Aging400 - 450oC, 4h, Quenching1100 - 1150oC, oil,
Annealed strip 0.1 - 2 1670 Aging450 - 550oC, 2 - 4h,
Wire 2450-2650


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 less), [ A/m] Hc
- Magnetic permeability (not more than), [ MHN/m] Umax
- Losses per unit (max) 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


Clock mechanism springs, sensor elements, cylindrical coil springs, surgical instruments, electrical measuring instrument cores. The permissible operating temperature is not more than 400 °C.


All presented products of 40KHNM grade are certified. The technical documentation includes data on the chemical composition, the limiting percentage of impurities; mechanical properties of 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 efficiency of service.

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All precision alloys sold by Evek GmbH comply with state quality standards. We supply rolled metal products of standard and non-standard sizes in the shortest terms. High quality, reasonable prices and a wide range of products determine the face of our company. Becoming our regular customer, you can count on a system of discount discounts. Cooperation with us will help you realize any engineering plans. We are waiting for your orders on our site.