Steel 15ХСМФБ (ЭП79)

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.