Alloy 32NK (ЭП475)
|Designation GOST Cyrillic||32НК|
|Designation GOST Latin||32HK|
|By chemical elements||32Ni|
|Designation GOST Cyrillic||ЭП475|
|Designation GOST Latin||EP475|
|By chemical elements||-|
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.
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.
|Classification, nomenclature and General rules||В30||GOST 10994-74|
|Bars and shapes||В32||TU 14-1-4422-88, TU 14-11-245-88|
|Sheets and strips||В33||TU 14-1-4425-88|
|Blanks. Of the workpiece. Slabs||В31||TU 14-1-4743-89|
|Steel pipes and fittings to them||В62||TU 14-159-215-92|
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%.
|Section, mm||sT|s0,2, MPa||σU, MPa||d5, %|
|Billets THAT 14-1-4743-89. Quenching in water from 830-870 °C (for longitudinal samples)|
|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|
Description mechanical marks
|sT|s0,2||Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%|
|σU||Limit short-term strength|
|d5||Elongation after rupture|
|Macrostructure and pollution||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.|