Designation
| Name |
The value |
| Designation GOST Cyrillic |
15ХСМФБ |
| Designation GOST Latin |
15XCMFB |
| Transliteration |
15HSMFB |
| By chemical elements |
15CrСMoVNb |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП79 |
| Designation GOST Latin |
EP79 |
| Transliteration |
EhP79 |
| By chemical elements |
- |
Description
15ХСМФБ steel is used: for the production of billets intended for the manufacture of seamless hot-deformed tubes for the equipment and components of nuclear power plants.
Standards
| Name |
Code |
Standards |
| Blanks. Of the workpiece. Slabs |
В31 |
TU 14-1-1596-76 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
Nb |
| TU 14-1-1596-76 |
0.12-0.17 |
≤0.015 |
≤0.015 |
0.3-0.6 |
1.2-1.6 |
0.7-1 |
≤0.25 |
Rest |
≤0.25 |
0.2-0.35 |
≤0.1 |
0.4-0.6 |
0.2-0.4 |
Fe is the basis.
According to TU 14-1-1596-76 the chemical composition is presented for steel grade 15ХСМФБ-ВД (ЭП79-ВД). Deviations in chemical composition are allowed within GOST 4543, except for manganese. For manganese, a deviation of + 0.020 / -0.10% is allowed.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
y, % |
KCU, kJ/m2 |
| Tubular billet on the other 14-1-1596-76. Vacation at 740±20 °C |
| Образец 25х25 |
≥295 |
≥490 |
≥22 |
≥65 |
≥1470 |
| Образец 25х25 |
≥196 |
≥340 |
≥20 |
≥65 |
- |
Description mechanical marks
| Name |
Description |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σU |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| KCU |
Toughness |
Technological properties
| Name |
The value |
| Macrostructure and pollution |
In the macrostructure of the workpiece on the other 14-1-1596-76 should be free of cracks, gas bubbles, traces of shrinkage, inclusions, delaminations visible to the naked eye. Acceptable: Central porosity, point heterogeneity, liquation and ≤ 1.0 points according to the scales GOST 10243; - layer-by-layer crystallization of ≤ 3.0 points on a scale GOST 10243. The content of nonmetallic inclusions in the metal tube blank must be: - oxides of stroke OS ≤ 1.5 points; - oxides of point OF ≤ 1.5 points; sulfide ≤ 1.0 points; - silicates ≤ 1.0 points; - globules ≤ 1.5 points; - nitrides ≤ 2.5 points. |
| Particularities of production of goods |
Tubular billet on the other 14-1-1596-76 should match up 01-1874-62. The tubular billet is supplied without heat treatment in a ragged condition with a surface finish not less than 3 class according to GOST 2789. The degree okowa metal tube blank must be at least 3. |
