Alloy 42N (ЭП318; 42NA)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
42Н |
| Designation GOST Latin |
42H |
| Transliteration |
42N |
| The chemical elements |
42Ni |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП318 |
| Designation GOST Latin |
EP318 |
| Transliteration |
EhP318 |
| The chemical elements |
- |
| Name |
The value |
| Designation GOST Cyrillic |
42НА |
| Designation GOST Latin |
42HA |
| Transliteration |
42NA |
| The 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 |
| Tapes |
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 norms |
В30 |
GOST 10994-74 |
| Steel alloy wire |
В73 |
GOST 14081-78, TU 14-1-682-73, TU 14-1-1163-74 |
| Sectional and shaped rolling |
В32 |
GOST 14082-78, TU 14-1-604-73, TU 14-11-245-88 |
| Sheets and stripes |
В33 |
TU 14-1-3727-84 |
| Bulls. Blanks. Slabs |
В31 |
TU 14-1-3904-84 |
| Tapes |
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 |
The 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 characteristics
| Section, mm |
σB, 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 |
| Section |
Section |
| σB |
Limit short-term strength |
| d4 |
Elongation after rupture |
Physical characteristics
| Temperature |
r, кг/м3 |
a, 10-6 1/°С |
| 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 |
| Inflection Point Temperature |
≥340 °C |
