Alloy N70MFV (ЭП814А)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
Н70МФВ |
| Designation GOST Latin |
H70MFB |
| Transliteration |
N70MFV |
| The chemical elements |
Ni70CuPВ |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП814А |
| Designation GOST Latin |
EP814A |
| Transliteration |
EhP814A |
| The chemical elements |
- |
Description
Alloy N70MFV used: for the manufacture of welded structures operating at high temperature in hydrochloric, sulfuric, phosphoric acid and other environments are restorative in nature; parts and accessories for the chemical industry; for repair of welded joints of parts and units operating in radioactive environments; as a cladding layer in the manufacture of hot-rolled dual-layer corrosion-resistant sheets.
Note
Corrosion resistant alloy on a Nickel basis.
The alloy is resistant to intergranular corrosion in aggressive environment of reduction.
Standards
| Name |
Code |
Standards |
| Sheets and stripes |
В33 |
GOST 10885-85, GOST 24982-81, TU 14-1-4684-89 |
| Classification, nomenclature and general norms |
В30 |
GOST 5632-72 |
| Bulls. Blanks. Slabs |
В31 |
OST 3-1686-90, TU 14-1-1214-75 |
| Welding and cutting of metals. Soldering, riveting |
В05 |
OST 95 10441-2002 |
| Test methods. Packaging. Marking |
В09 |
RD 24.200.15-90 |
| Thermal and thermochemical treatment of metals |
В04 |
ST ЦКБА 016-2005 |
| Tapes |
В34 |
TU 14-1-4253-87 |
| Sectional and shaped rolling |
В32 |
TU 14-11-245-88 |
| Pipes steel and connecting parts to them |
В62 |
TU 14-3-1227-83 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| TU 14-1-4684-89 |
≤0.02 |
≤0.02 |
≤0.025 |
≤0.5 |
≤0.3 |
≤0.1 |
The rest |
≤0.5 |
- |
1.4-1.7 |
≤0.15 |
25-27 |
0.1-0.45 |
| GOST 5632-72 |
≤0.02 |
≤0.012 |
≤0.015 |
≤0.5 |
≤0.3 |
≤0.1 |
The rest |
≤0.8 |
≤0.3 |
1.4-1.7 |
≤0.15 |
25-27 |
0.1-0.45 |
Ni is the basis.
According to GOST 5632-72, the chemical composition is given for the alloy N70MFB.
According to TU 14-1-4684-89, the chemical composition is given for the alloy N70MFB-VI (EP814A-VI) H70MFB-ID (ED814A-ID). Deviations in the finished sheet are allowed according to the chemical composition: by tungsten ± 0.050%, by iron + 0.50%, by molybdenum + 0.50%, by carbon +0.010%, by silicon +0.050%. The calculated content of modifiers and deoxidizers (magnesium, cerium and aluminum) is established by the supplier's technological instructions and their residual content in the metal is not determined by chemical analysis.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
Brinell hardness number, MPa |
| Blank pieces of pipe fittings according to ST CKBA 016-2005: Quenching in water from 1100-1120 °C (aging of 1.0 to 1.5 min/mm of maximum cross section but not less than 0.5 h) |
| ≤60 |
≥343 |
≥784 |
≥30 |
180-230 |
| Steel hot-rolled sheet (4.0 to 11.0 mm) in the delivery state according to GOST 24982-81. Quenching in water, under a water shower or air 1050-1090 °C |
| 4-11 |
≥365 |
≥780 |
≥40 |
- |
| Steel hot-rolled sheet in the delivery condition on the other 14-1-4684-89. Quenching in water from 1070-1090 °C (heating 5 minutes per 1 mm thickness) |
| 4.5-10 |
≥365 |
≥780 |
≥40 |
- |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
Technological properties
| Name |
The value |
| Weldability |
Manual argon arc welding with non-consumable electrode (filler or without filler material), combination welding methods, the allowable use of manual arc welding with coated electrodes. |
