Wire, rod, bar made of alloy 79NM
General characteristics
Grade 79NM consist of Ni (78,5−80%) and ferrum (the rest). It has a high electrical resistivity and firmness in an aggressive environment. For strengthening of electromagnetic properties, it must be alloyed with such elements as chrome, cuprum, molybdenum. A smelt is done in a vacuum or inert gas. A coiled bar from this steel relates to category of stainless products. A bar has a small cross-section and fixed length. A wire is widely used while welding nickel steels. A rod is used in energetic, chemical, textile and metallurgic industries.
Percentage composition GOST 10994−74
| S |
P |
Ti |
Al |
C |
Cu |
Si |
Mn |
Mo |
Fe |
Ni |
| ≤0,02 |
≤0,02 |
≤0,15 |
≤0,15 |
≤0.03 |
≤ 0.2 |
0.3 — 0.5 |
0.6 — 1.1 |
3.8 — 4.1 |
13.8 — 16.8 |
78.5 — 80 |
Relevance
Bar, rod, wire are the most popular products of high-nickel mill products. Nowadays, they have the widest appliaction as parts of electrotechnical constructions, which are utilized on mechanical engineering and energetics. High-nickel alloys are hard-welded and that. That is why there are made a thermal processing and the last annealing for strengthening of welds. A technical lifetime of such products is very huge, but at high temperatures (900°C) it significantly decreases.
Physical characteristics
| Description |
Identification |
| Modulus of elasticity of first kind [MPa] |
E |
| Heating capacity of material (or coefficient of conductivity for heat) [V/(m/degree] |
l |
| Required temperature for obtaining of actual features [Degree] |
T |
| Linear expansion thermal coefficient [1/degree] (range of temperatures 20°С) |
a |
| Specific electrical resistivity [Оhm-mm2/m] 0,81 |
R |
| Density of a material, [kg/m3] |
r |
| Specific heat of a material [J/(kg/degree)] (range of temperature 20°С) |
C |
Magnetic characteristics
| Description |
Identification |
| Coercive field (not higher) [A/m] |
Hc |
| Magnetical inductive capacity (not higher) [mH/m] |
Umax |
| Saturation induction 2 T [V/kg] |
P1.0/50 |
| Magnetic T induction, magnetic field strength no less than 100, in magnetic field, [A/m] |
B100 |
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]-1 125−195 |
HB |
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79NM wire, rod, bar supplier
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