Invar 42 pipe
Characteristics of alloy
This alloy relates to a group of precision alloys with a defined TCLE (linear expansion thermal coefficient in a range of temperatures -70º +340ºC, not higher than 4.5 — 5.5x10-6/C°) and is used in electrovacuum equipment. Invar is a precision alloy that possesses unique physical, mechanical characteristics (magnetic, elastic, heating, electrical). It differs with a high accuracy of chemical composition, carefulness of manufacture, processability, an absence of residual elements. An actual category relates to high-alloyed alloys. Such precision alloys are manufactured on a basis of iron, nickel, copper, mangan, cobalt. The marking Ni42 means that alloy contains about 42% of nickel.
Percentage composition:
| Ni |
Cu |
P |
Mn |
Si |
C |
Fe |
S |
| 41.5 — 43 |
≤0.1 |
≤0.015 |
≤ 0.4 |
≤ 0.3 |
≤0.03 |
56.14 — 58.5 |
≤0.015 |
Name of this alloy originates from a word «invariant» which means «unchanged» and corresponds a truth because TCLE of invar almost does not change in a temperature range -70º — +340ºC.
Physical characteristics
| V/(m/deg) |
Degree |
MPa |
1/Deg |
Ohm-m |
J/(kg/degree) |
kg/m3 |
| |
20 |
1,42 |
|
580 |
|
8200 |
Mechanical features at a temperature 20 °C.
| Product mix |
KCU |
Thickness |
d5 |
y |
sv |
sT |
Heat treating |
F.e. |
| Hammer-hardened tape, GOST 14 080−78 |
|
0,8−1.5 |
|
|
930 |
|
|
|
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: before welding to heat the details up to 200−300°C, heat treating (annealing) after welding. |
| weldable without stint |
welding is done without further heat treating or previous heating. |
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] |
HB |
Physical characteristics
| Description |
Identification |
| Modulus of elasticity of first genus [MPa] |
E |
| Heating capacity of material (or coefficient of conductivity for heat) [V/(m/deg)] |
l |
| Required temperature for obtaining of actual features, [Degree] |
T |
| Linear expansion thermal coefficient [1/Degree] (range of temperatures 20°С) |
a |
| Electrical unit-area resistance [Ohm-m] |
R |
| Density of an actual material, [kg/m3] |
r |
| Specific heat of a material [J/(kg/deg)] (range of temperature 20°С) |
C |
Magnetic characteristics
| Description |
Identification |
| Coercive field (not higher) [A/m] |
Hc |
| Magnetic inductive capacity (not higher) [mH/m] |
Umax |
| Specific loss (not higher) 50 hz of frequency, magnetic induction 1.0 Т[ B/kg ] |
P1.0/50 |
| Magnetic T induction, magnetic field strength no less than 100, in magnetic field, [A/m] |
B100 |
Invar 42 pipe supplier
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