Alloy 42ХНМ (ЭП630У)

Designation

Name	The value
Designation GOST Cyrillic	42ХНМ
Designation GOST Latin	42XHM
Transliteration	42HNM
By chemical elements	42CrNiCu

Name	The value
Designation GOST Cyrillic	ЭП630У
Designation GOST Latin	EP630U
Transliteration	EhP630U
By chemical elements	-

Description

Alloy 42ХНМ used: for the manufacture of products of special purpose; extremely thin-walled pipes used for the manufacture of parts in the reactor manufacturing, cladding, SVP and RIN (working neutron sources), the elements of active zones of nuclear reactors.

Note

Chrome-Nickel, precision, corrosion-resistant alloy.

Standards

Name	Code	Standards
Steel pipes and fittings to them	В62	8009.00.001 ТУ, 8009.00.002 ТУ, 8009.00.022 ТУ
Bars and shapes	В32	TU 14-131-987-2002, TU 14-1-5436-2001

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Al	Ti	Mo	W	Ce	Mg
TU 14-131-987-2002	≤0.03	≤0.01	≤0.01	≤0.2	41-43	≤0.25	Rest	≤0.6	≤0.4	-	1-1.5	0.05-0.3	-	-
8009.00.002 ТУ	≤0.03	≤0.01	≤0.01	≤0.2	40.5-43.5	≤0.25	Rest	≤0.6	≤0.4	≤0.25	1-1.5	0.05-0.3	-	-
TU 14-1-5436-2001	≤0.03	≤0.01	≤0.01	≤0.2	41-43	≤0.25	Rest	≤0.6	≤0.4	≤0.25	1-1.5	0.05-0.3	0.02-0.2	0.01-0.03

Ni is the basis.
According to TU 14-131-987-2002, the chemical composition is presented for the alloy 42ХНМ-Ш, 42ХНМ-ВД. Permissible deviation by mass fraction of chromium is ± 0.050%. The alloy is introduced by the calculation of cerium in the range of 0.02-0.20% and magnesium in the range of 0.01-0.03% and is not determined by chemical analysis. In the alloy, the residual mass fraction of titanium is not more than 0.25%. Conduct a control of the mass fraction of nitrogen and cobalt in the alloy, the results of which are recorded in the certificate.
According to TU 14-1-5436-2001, the chemical composition is presented for the alloy grade 42HNM. Permissible deviation by mass fraction of chromium ± 0.50%. Cerium and magnesium are introduced into the alloy by calculation and chemical analysis are not determined. In the alloy, the mass fraction of titanium is not more than 0.25%. The mass fraction of nitrogen and cobalt is monitored and the results are recorded in the certificate.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %
The bars as supplied without a heat treatment on the other 14-1-5436-2001. The longitudinal samples
	-	≥740	≥30
Extremely thin-walled tubes in the delivery condition on 8009.00.001 TU
-	≥392	≥735	≥30
Bars on the other 14-1-5436-2001. The longitudinal samples. Hardening in air, 1080-1120 °C
	-	≥690	≥35
Extremely thin-walled tubes in the delivery condition on 8009.00.001 TU
-	≥274	≥539	≥30
Bars with special surface heat-treated in the delivery condition on the other 14-131-987-2002
	≥440	≥740	≥30
Pipe cold-worked welded austenitic supplied by 8009.00.002 TU
-	≥392	≥735	≥35
-	≥245	≥539	≥30
Pipe cold-worked welded austenitic supplied by 8009.00.022 TU ( in the delivery condition specified pipe diameters)
-	≥372.4	≥686	≥35
-	≥250	≥490	≥32
-	≥372.4	≥686	≥27
-	≥245	≥490	≥27

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	Contamination of alloy, non-metallic inclusions on the other 14-131-987-2002 in the evaluation by the maximum score shall not exceed: - Oxides (OS, OF) - 1 point; - Silicates (SC, SP) - 1 point; - Sulphides (S) - 1 point; - Nitrides (NS, NT) - 3 points. Contamination of the alloy pipe at the 8009.00.001 THE 8009.00.002 TU TU 8009.00.022 and non-metallic inclusions in the assessment for a maximum score of inclusions, must not exceed: - oxygen stroke, oxygen globular (dot) and sulfides - 2 points each; the nitrides and carbonitrides - 2.5 points each. The macrostructure of bars on the other 14-1-5436-2001 should not have residues shrinkage, subcortical bubbles, cracks, inclusions, delaminations visible to the naked eye. Assessment of the quality of macrostructure for Central porosity, point heterogeneity, common spotted and boundary liquation spend, with the amount of defects must not exceed: - Central porosity, point heterogeneity, exudation square and common spotted liquation - 2 points; regional spotty liquation and liquation Pousada - 1 points.
Microstructure	Grain size of austenite of alloy on the other 14-131-987-2002 on delivery 7-11 number 8009.00.001 8009.00.002 TU and TU - 6-11 room; 8009.00.022 TU - 4-8 number according to GOST 5639.
Particularities of production of goods	Bars with special surface finish on the other 14-131-987-2002 supplied in heat treated condition. Tubes at 8009.00.001 TU put after heat treatment in vacuum or basicsliderui environment.