Steel 015Х20Н25Г2Б (ЭП754)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
015Х20Н25Г2Б |
| Designation GOST Latin |
015X20H25G2B |
| Transliteration |
015H20N25G2B |
| The chemical elements |
015Cr20Н25Mn2Nb |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП754 |
| Designation GOST Latin |
EP754 |
| Transliteration |
EhP754 |
| The chemical elements |
- |
Description
015Х20Н25Г2Б steel is used: for the production of billets used for the manufacture of pipes used in the chemical industry and the energy sector, including nuclear power plants.
Standards
| Name |
Code |
Standards |
| Bulls. Blanks. Slabs |
В31 |
TU 14-1-3276-81 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Fe |
N |
V |
Nb |
| TU 14-1-3276-81 |
≤0.015 |
≤0.01 |
≤0.015 |
1.5-2.3 |
20-21 |
0.05-0.3 |
The rest |
≤0.015 |
0.05-0.3 |
0.5-0.8 |
Fe is the basis.
According to TU 14-1-3276-81, the chemical composition is presented for steel grade 015Х20Н25Г2Б-ИД (ЭП754-ИД). In the finished metal, deviations in the mass fraction of the elements are allowed: for carbon +0.0050%, for chromium ± 0.10%, for nickel ± 0.10%, for nitrogen + 0. 0050%. The finished metal should have a residual cobalt content of ≤ 0.0050%, a residual copper content of ≤ 0.050%.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
| Tubular billet on the other 14-1-3276-81. Annealing in air from 1100±20 °C |
|
- |
≥450 |
≥38 |
|
≥118 |
≥343 |
≥29 |
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 |
In the macrostructure of the workpiece on the other 14-1-3276-81 in the state of delivery should be free of cracks, gas and subcortical bubbles, delaminations, traces of shrinkage, inclusions, visible to the naked eye. Layer-by-layer crystallization and the square of the increased travelmasti is not a rejection symptom. Under the control of the workpiece on the transverse microtemplate allowed Central porosity 1 point, point heterogeneity 1 point, exudation square - not more than 1 score. Evaluation on the contamination of metal non-metallic inclusions is determined by the maximum score. Norms of inclusion should not exceed : - sulphides - 1.0 points; - point nitrides and carbonitrides - 2.0 points; - the total number of stroke and point nitrides and carbonitrides on each sample is 3.5 points. Stroke nitrides and carbonitrides are estimated by the method of "W", "Ш6" by the average and maximum score. The average score must not exceed 2 and a maximum of 2.5 points. The number of samples with the maximum score should be no more than 2. the Total amount of oxygen inclusions (granules and globules of oxides, spinels, silicates and silicate glasses) shall not exceed for 2 sections in total: a) from 1 to 2 inclusive divisions of the ocular scale - 50 inclusions; b) from 2 to 3 inclusive divisions of the ocular scale - 1 activation. |
| Features of production |
Clan of the workpiece on the other 14-1-3276-81 should be not less than 4.5. The tubular billet is supplied without heat treatment. |
| Corrosion resistance |
The metal tube blank on the other 14-1-3276-81 must be able to withstand the test of susceptibility to intergranular attack. |
