68NHWKTJU strip, sheet
Characteristics of 68NHWKTJU
This precision alloy relates to alloys with defined characteristics of elasticity. It is used in a manufacture of rolled bar that is utilized in making elastic sensitive elements and operates at temperature -196 + 500 °C. It is an alloy that possesses unique physical and mechanical characteristics (elastic, heating, electrical and magnetic). It is characterized by an accuracy of chemical composition, a preciseness of manufacture, processing, and absence of residual elements. Iron, copper, nickel, niobium, cobalt constitute composition.
Physical features of 68NHWKTJU
| Ohm-m |
MPa |
Degree |
J/(kg/degree) |
1/Degree |
V/(m/degree) |
kg/m3 |
| |
1.79 |
20 |
|
8 |
|
|
| R 10 9 |
E 10— 5 |
T |
C |
a 10 6 |
l |
r |
Percentage composition of alloy
| Cu |
Si |
Fe |
C |
S |
Mn |
P |
Cr |
Ni |
W |
V |
Co |
Ce |
Al |
Nb |
Ti |
B |
- |
| ≤0,07 |
≤ 0.4 |
≤1 |
≤0.05 |
≤0,01 |
≤ 0.4 |
≤0.015 |
18 — 20 |
55.402 — 63.5 |
9 — 10.5 |
≤ 0.2 |
5.5 — 6.7 |
≤0.05 |
1.3 — 1.8 |
to 0.2 |
2.7 — 3.2 |
до 0.003 |
B, Ce — computing |
Physical characteristics
| Description |
Identification |
| Modulus of elasticity of first kind [MPa] |
E |
| Heating capacity of material (or coefficient of conductivity for heat) [V/(m/degree] |
l |
| Required temperature for obtaining of actual features [Degree] |
T |
| Linear expansion thermal coefficient [1/degree] (range of temperatures 20°С) |
a |
| Specific electrical resistivity [Оhm-mm2/m] 0,81 |
R |
| Density of a material, [kg/m3] |
r |
| Specific heat of a material [J/(kg/degree)] (range of temperature 20°С) |
C |
Magnetic characteristics
| Description |
Identification |
| Coercive field (not higher) [A/m] |
Hc |
| Magnetical inductive capacity (not higher) [mH/m] |
Umax |
| Saturation induction 2 T [V/kg] |
P1.0/50 |
| Magnetic T induction, magnetic field strength no less than 100, in magnetic field, [A/m] |
B100 |
Mechanical characteristics
| Description |
Identification |
| Short resistance to rupture [MPa] |
sv |
| Flow limit (proportional limit load) for permanent change of form [MPa] |
sT |
| Percent elongation at fracture [ % ] |
d5 |
| Contraction ratio [ % ] |
y |
| Impact hardness [ kJ/m2] |
KCU |
| Brinell hardness [MPa]-1 125−195 |
HB |
Welding:
| Type |
Description |
| limitedly weldable |
welding is possible at heating to 100−120°С and last heat treating |
| hardly weldable |
in order to obtain a qualitative welded joints, it is necessary to perform the following operations: while welding to heat it up to 200−300°C, heat treating (annealing) after welding |
weldable
without stint |
welding is done without further heat treating or previous heating |
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