Alloy 32NK (ЭП475)

Designation

Name The value
Designation GOST Cyrillic 32НК
Designation GOST Latin 32HK
Transliteration 32NK
By chemical elements 32Ni
Name The value
Designation GOST Cyrillic ЭП475
Designation GOST Latin EP475
Transliteration EhP475
By 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 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

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 Rest 3.7-4.7
GOST 10994-74 ≤0.03 ≤0.015 ≤0.015 ≤0.4 ≤0.1 ≤0.3 31.5-33 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 properties

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)
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
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

Technological properties

Name The value
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.