Relevance
Precision alloy grade 47NKHR represents alloys with a minimum thermal coefficient of linear expansion (TKHR up to 8.5-11 [1/ºC]) in the temperature range -70 +330ºC. Such alloy is relevant for hermetic junctions with glass or mica. The group of precision alloys based on iron and nickel are distinguished by their exclusive physical and chemical properties (magnetic, thermal, elastic, electrical), due to the accuracy of composition, thoroughness of manufacturing and processing, absence of unnecessary impurities.
Percentage composition
| Si |
C |
Fe |
Mn |
P |
S |
Ni |
B |
Cr |
|---|
| up to 0.3 |
up to 0.05 |
45.2 - 49.5 |
up to 0.4 |
up to 0.015 |
to 0.015 |
46 - 48 |
to 0.02 |
4.5 - 6 |
Physical properties of the alloy 47NCR.
| Grad |
W/(m-grad) |
1/Grad |
MPa |
kg/m3 |
Oh-m-m |
J/(kg-grad) |
|---|
| T |
l |
a 10 6 |
E 10- 5 |
r |
R 10 9 |
C |
| 20 |
|
|
1.4 |
|
900 |
|
Mechanical properties of 47NKhR alloy at 20 °C.
| Range |
Size |
sT |
sT in |
e.g. |
KCU |
y |
d5 |
Thermal treatment. |
|---|
|
mm |
MPa |
MPa |
- |
kJ/m2 |
% |
% |
- |
|
|
|
450-550 |
|
|
|
25 |
annealing |
Designations
Physical properties of the alloy:
| Description |
Designation |
|---|
| - Alloy data acquisition temperature [degrees] |
- 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 |
weldability:
| 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 |
Delivery
All 47NCR grade products are certified. Technical documentation includes data on chemical composition, limiting percentage of impurities, and 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 responsiveness of service.
Buy at the best price
Evek GmbH has an unlimited range of precision alloys of the highest quality. We offer special alloys at the best price. If you are interested in our offer please contact your nearest office. Qualified specialists will provide all necessary information regarding products, price range, sales conditions. The cost of goods depends on the parameters of products and additional terms of delivery.
