Alloy 42ХНМ (ЭП630У)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
42ХНМ |
| Designation GOST Latin |
42XHM |
| Transliteration |
42HNM |
| The chemical elements |
42CrNiCu |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП630У |
| Designation GOST Latin |
EP630U |
| Transliteration |
EhP630U |
| The 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 |
| Pipes steel and connecting parts to them |
В62 |
8009.00.001 ТУ, 8009.00.002 ТУ, 8009.00.022 ТУ |
| Sectional and shaped rolling |
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 |
The 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 |
The 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 |
The 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 characteristics
| Section, mm |
sT|s0,2, MPa |
σB, 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 |
| 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 |
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. |
| Features of production |
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. |
