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	s_T\|s_0,2, MPa	σ_U, 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
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	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.