Alloy 03Х20Н45М4БЧ (ЧС42)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
03Х20Н45М4БЧ |
| Designation GOST Latin |
03X20H45M4BCh |
| Transliteration |
03H20N45M4BCh |
| The chemical elements |
03Cr20Ni45Cu4BeЧ |
| Name |
The value |
| Designation GOST Cyrillic |
ЧС42 |
| Designation GOST Latin |
ChC42 |
| Transliteration |
ChS42 |
| The chemical elements |
ЧPb42 |
Description
Alloy 03Х20Н45М4БЧ used: for the production of forged billets used for the manufacture of extremely thin-walled pipes of high precision; parts of shells of fuel elements for transport and stationary nuclear power plants.
Note
The alloy austenitic. The alloy has a greater resistance to low-temperature radiation embrittlement, radiation swelling, radiation creep, corrosion damage in comparison with steel 03KH16N15M3B.
Standards
| Name |
Code |
Standards |
| Bulls. Blanks. Slabs |
В31 |
TU 14-1-1903-77 |
| Sectional and shaped rolling |
В32 |
TU 14-1-2712-79, TU 14-1-2916-80 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
N |
Al |
Ti |
Mo |
Nb |
Y |
| TU 14-1-2916-80 |
0.015-0.025 |
≤0.01 |
≤0.015 |
≤0.8 |
19-20.5 |
≤0.8 |
44-46 |
The rest |
≤0.15 |
≤0.02 |
≤0.2 |
≤0.1 |
3.3-4.3 |
0.75-0.95 |
0.02-0.06 |
Ni is the basis.
According to TU 14-1-2916-80 the chemical composition is given for the alloy 03Х20Н45М4БЧ-ВИ (ЧС42-ВИ).
According to TU 14-1-1903-77 the chemical composition is given for the alloy 03Х20Н45М4БЧ-ВИ (ЧС42-ВИ). The tolerance for the mass fraction of carbon is set to -0.0050%.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
| Tubular billet on the other 14-1-1903-77. Austenization at 1050 °C (aging for 1 h), air cooling (longitudinal samples, cut from a square sample of 90 mm) |
| 20-25 |
≥175 |
≥540 |
≥40 |
≥65 |
| 20-25 |
≥147 |
≥440 |
≥38 |
≥65 |
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 |
| y |
The relative narrowing |
Technological properties
| Name |
The value |
| Macrostructure and contamination |
On the other 14-1-1903-77 macrostructure of the alloy on the cross etched templeto should not be visible to the naked eye: podnasadochnogo looseness, cracks, slag inclusions, crusts, delamination and subcortical bubbles. The Central porosity, point heterogeneity (total porosity) and segregated square in the delivered profile should not exceed 1 score. On the outer surface of a tube blank as supplied must not be cracked, shells, shells, sunsets (zakonov), wooloowin, pesochin, delaminations, inclusions, visible without using the magnifying devices. Contamination of metal non-metallic inclusions is evaluated by the maximum score should be: - stroke OS oxides ≤ 1.0 points; a point FROM oxides ≤ 1.0 points; - silicates fragile CX ≤ 1.0 points; - silicates plastic SP ≤ 1.0 points; - silicates, non-deformed SN ≤ 1.0 points; sulfide ≤ 1.0 points; - carbonitrides, nitrides, NS, NT ≤ 3.0 points. |
| Corrosion resistance |
Arbitration test susceptibility to intergranular attack produced by the method AM GOST 6032 (test duration 24 hours) with provotsiruet by heating at a temperature of 650 °C for 2 hours. The quenching temperature before precipitating heat of 1050 °C. the susceptibility to intercrystalline corrosion shall be tested three samples from a test ingot, batch - melting. |
