Alloy 42N (ЭП318; 42NA)
Designation
Description
Alloy 42N usedin vacuum technology; as a passive layer in the manufacture of thermostatic bimetallic, is used for making sensitive to the temperature change of the elements of control and measuring instruments and apparatus.
When using alloy grade 42N and the active layer of the alloy 19NKH made thermobimetals brand ТБ103/70 (ТБ1032), which is used for the manufacture of heat-sensitive elements of devices (machines, network security, relay, etc.).
When using alloy grade 42N and the active layer of the alloy 24NKH made thermobimetals brand ТБ107/71 (ТБ1132), which is used for the manufacture of heat-sensitive elements of devices (relays, regulators, pulse sensors, fuses, etc.).
Note
Alloy with a low CTE value.
Alloy with a CTE (4,5−5,5)·10-6 deg-1 in the temperature range from -70 to + 340 °C.
Thermobimetals ТБ103/70 (ТБ1032) with the average response factor (15,5−18,5)·10-6 deg-1, with an average specific electrical resistance (0,67−0,73) Ohm·mm2/m.
Thermobimetals ТБ107/71 (ТБ1132) with the average response factor (16,0−19,0)·10-6 deg-1, with an average specific electrical resistance (0,68−0,74) Ohm·mm2/m.
Standards
Chemical composition
According to GOST 10994-74 for alloys of grades 42H, 42H-VI the mass fraction of vanadium, molybdenum, chromium, aluminum should not be more than 0.1% of each. According to the manufacturer's agreement with the consumer when smelting in 40-ton furnaces, the mass fraction of vanadium, molybdenum, aluminum, not more than 0.15% of each, chromium - not more than 0.2% is allowed in the alloy 42H. In the production of the alloy for the production of bimetals, the content of S≤0,020%, P≤0,020% is regulated.