Alloy ХН35ВБ (ЭП912)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
ХН35ВБ |
| Designation GOST Latin |
XH35BB |
| Transliteration |
HN35VB |
| The chemical elements |
CrNi35ВBe |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП912 |
| Designation GOST Latin |
EP912 |
| Transliteration |
EhP912 |
| The chemical elements |
- |
Description
Alloy ХН35ВБ used: for the manufacture of parts of pipelines, gas systems aerospace engineering.
Note
Heat-resistant and heat-resistant alloy of iron-Nickel basis.
The recommended maximum operating temperature for a long time +950−1000 °C.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В32 |
TU 14-1-4222-86 |
| Bulls. Blanks. Slabs |
В31 |
TU 14-1-4223-87 |
| Pipes steel and connecting parts to them |
В62 |
TU 14-3-1583-88 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
B |
Nb |
W |
Nd |
| TU 14-1-4222-86 |
≤0.08 |
≤0.015 |
≤0.015 |
≤0.5 |
13-15 |
≤0.5 |
34-38 |
The rest |
≤0.005 |
0.6-1.2 |
9-11 |
≤0.4 |
| TU 14-1-4223-87 |
≤0.08 |
≤0.015 |
≤0.015 |
≤0.5 |
13-15 |
≤0.5 |
34-38 |
The rest |
≤0.005 |
0.8-1.2 |
9-11 |
≤0.4 |
Fe is the basis.
According to TU 14-1-4223-87 and According to TU 14-1-4222-86, the chemical composition is presented for the alloy KhN35VB-VD (EP912-VD) for vacuum-arc remelting and KhN35VB-ID (EP912-ID). In the finished metal, deviations from the indicated chemical composition are allowed: for niobium ± 0.10%, for chromium -0.30%, for tungsten -0.20%. Instead of niodim, lanthanum is allowed to be introduced into the metal in the same quantities. Neodymium (lanthanum) and boron are introduced into the metal by calculation and chemical analysis are not determined.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
| Pipe forged billet according to TU 14-1-4223-87. Annealing in air from 1100-1150 °C (exposure of 20-40 min.) (longitudinal samples) |
| 20-25 |
≥196 |
≥540 |
≥30 |
≥50 |
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 |
| Pressure treatment |
Of forging of billets with a diameter of 180 mm on the other 14-1-4223-87 must be at least 2.5. For diameters of the workpiece 215 and 250 mm clan are not specified. |
| Macrostructure and contamination |
The macrostructure of alloy tube billets TU 14-1-4223-87 on cross etched templeto should not have podsadecki porosity, subcortical bubbles, forging cracks, foreign metal and non-metallic microflute and other defects are visible without using the magnifying devices. Contamination of the alloy workpieces of non-metallic inclusions shall not exceed the maximum score: - oxides of stroke (OS) - 1.5 points; - point oxides (FROM) - 1.5 points; - the silicates fragile (CX) - 1.5 points; - the silicates plastic (SP) - 1.5 points; - the non-deformable silicates (SN) - 1.5 points; - sulphides (C) - 1.5 points; - for nitrides and carbonitrides point (NT) - 4.0 GPA - nitrides and carbonitrides stroke (HC) To 4.0 points. |
