Alloy 42N (ЭП318; 42NA)

Designation

Name The value
Designation GOST Cyrillic 42Н
Designation GOST Latin 42H
Transliteration 42N
By chemical elements 42Ni
Name The value
Designation GOST Cyrillic ЭП318
Designation GOST Latin EP318
Transliteration EhP318
By chemical elements -
Name The value
Designation GOST Cyrillic 42НА
Designation GOST Latin 42HA
Transliteration 42NA
By chemical elements 42Ni

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

Name Code Standards
Tape В34 GOST 10533-86, GOST 14080-78, TU 14-131-743-88, TU 14-1-3778-84, TU 14-1-3913-84, TU 14-1-4312-87
Classification, nomenclature and General rules В30 GOST 10994-74
Wire, steel, alloy В73 GOST 14081-78, TU 14-1-682-73, TU 14-1-1163-74
Bars and shapes В32 GOST 14082-78, TU 14-1-604-73, TU 14-11-245-88
Sheets and strips В33 TU 14-1-3727-84
Blanks. Of the workpiece. Slabs В31 TU 14-1-3904-84
Tape В54 TU 6365-003-46594163-2000

Chemical composition

Standard C S P Mn Si Ni Fe Cu
GOST 10994-74 ≤0.03 ≤0.015 ≤0.015 ≤0.4 ≤0.3 41.5-43 Rest ≤0.1
Fe is the basis.
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.

Mechanical properties

Section, mm σU, MPa d4
Cold-rolled steel strip according to GOST 14080-78 on delivery
0.1-2.5 ≤930 -
0.3-2.5 440-590 ≥23

Description mechanical marks

Name Description
σU Limit short-term strength
d4 Elongation after rupture

Physical characteristics

Temperature r, kg/m3 a, 10-6 1/°C
20 8200 -
100 - 40
200 - 41
300 - 41
400 - 54
500 - 75
600 - 92
700 - 103
800 - 114

A description of the physical symbols

Name Description
Е The normal elasticity modulus
l Coefficient of thermal conductivity
a The coefficient of linear expansion

Technological properties

Name The value
The temperature of the inflection point ≥340 °C