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.
|41.5 — 43
||56.14 — 58.5
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.
Mechanical features at a temperature 20 °C.
|Hammer-hardened tape, GOST 14 080−78
||welding is possible at heating to 100−120°С and last heat treating|
||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.|
|Short resistance to rupture [MPa]
|Flow limit (proportional limit load) for permanent change of form [MPa]
|Percent elongation at fracture [ % ]
|Contraction ratio [%]
|Impact hardness [ kJ/m2]
|Brinell hardness [MPa]
|Modulus of elasticity of first genus [MPa]
|Heating capacity of material (or coefficient of conductivity for heat) [V/(m/deg)]
|Required temperature for obtaining of actual features, [Degree]
|Linear expansion thermal coefficient [1/Degree] (range of temperatures 20°С)
|Electrical unit-area resistance [Ohm-m]
|Density of an actual material, [kg/m3]
|Specific heat of a material [J/(kg/deg)] (range of temperature 20°С)
|Coercive field (not higher) [A/m]
|Magnetic inductive capacity (not higher) [mH/m]
|Specific loss (not higher) 50 hz of frequency, magnetic induction 1.0 Т[ B/kg ]
|Magnetic T induction, magnetic field strength no less than 100, in magnetic field, [A/m]
Invar 42 pipe supplier
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