Alloy 32NK (ЭП475)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
32НК |
| Designation GOST Latin |
32HK |
| Transliteration |
32NK |
| The chemical elements |
32Ni |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП475 |
| Designation GOST Latin |
EP475 |
| Transliteration |
EhP475 |
| The chemical elements |
- |
Description
Alloy 32NK used: for the manufacture of products with a polished surface, parts of complex shape that cannot be subjected to annealing to obtain a lower CTE; pipes.
Note
The alloy in the annealed condition with a minimum CTE of not more than 1.5·10-6 deg-1 in the temperature range from minus 60 to plus 100 °C.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and general norms |
В30 |
GOST 10994-74 |
| Sectional and shaped rolling |
В32 |
TU 14-1-4422-88, TU 14-11-245-88 |
| Sheets and stripes |
В33 |
TU 14-1-4425-88 |
| Bulls. Blanks. Slabs |
В31 |
TU 14-1-4743-89 |
| Pipes steel and connecting parts to them |
В62 |
TU 14-159-215-92 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Co |
| TU 14-159-215-92 |
≤0.03 |
≤0.02 |
≤0.02 |
≤0.4 |
≤0.1 |
≤0.3 |
31.5-32.5 |
The rest |
3.7-4.7 |
| GOST 10994-74 |
≤0.03 |
≤0.015 |
≤0.015 |
≤0.4 |
≤0.1 |
≤0.3 |
31.5-33 |
The rest |
3.7-4.7 |
Fe is the basis.
According to GOST 10994-74 the chemical composition is given for the alloy grade 32KN-VI.
According to TU 14-1-4743-89, TU 14-159-215-92, the chemical composition is given for the alloy 32KN-IL (EP475-IL), smelted by the vacuum induction melting method followed by electron-beam remelting. In the finished metal, the deviation from the chemical composition according to the nickel content is allowed to be + 0.50%.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
| Billets THAT 14-1-4743-89. Quenching in water from 830-870 °C (for longitudinal samples) |
| 20-25 |
≥245 |
≥390 |
≥30 |
| Electrically welded steel pipes high corrosion resistance and cold-resistance for oil and gas pipelines, heat-treated in the delivery condition on the other 14-159-215-92 |
| - |
≥245 |
≥390 |
≥30 |
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 |
| Macrostructure and contamination |
The macrostructure of the workpiece on the other 14-1-4743-89 should not have shrinkage and looseness, cracks, inclusions, blistering, delamination, visible without using the magnifying devices. The defects allowed must not exceed: - for a point heterogeneity - 1.0 points; - the Central porosity - 1.0 points; exudation square - 1.0 points. |
