Steel 08KH14N7ML (VNL-1; 5Х14Н7МЛ)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
08Х14Н7МЛ |
| Designation GOST Latin |
08X14H7ML |
| Transliteration |
08H14N7ML |
| The chemical elements |
08Cr14Н7Mo |
| Name |
The value |
| Designation GOST Cyrillic |
ВНЛ-1 |
| Designation GOST Latin |
BHL-1 |
| Transliteration |
VNL-1 |
| The chemical elements |
WНBe-1 |
| Name |
The value |
| Designation GOST Cyrillic |
5Х14Н7МЛ |
| Designation GOST Latin |
5X14H7ML |
| Transliteration |
5H14N7ML |
| The chemical elements |
5Cr14Н7Mo |
Description
08KH14N7ML steel is used: for the manufacture of castings corrosion-resistant parts operating at room and low (to -196 °C) temperatures; shaped castings for the aircraft industry; casting investment casting for aircraft industry group I — loaded items with the specific requirements for density and mechanical properties: high load brackets, sealed the housing, the frames of gyroscopes, stabilizers, etc. and group II — non-loaded and lightly loaded parts, rings, flanges, fittings, leaking instrument cabinets, etc.
Note
Stainless steel austenitic-martensitic class.
Standards
| Name |
Code |
Standards |
| Castings with special properties (cast iron and steel) |
В83 |
GOST 2176-77, OST 1 90090-79 |
| Castings, steel |
В82 |
GOST 977-88, OST 1 80059-83 |
| Sectional and shaped rolling |
В32 |
TU 14-1-861-74 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
N |
Al |
V |
Ti |
Mo |
W |
| OST 1 90090-79 |
≤0.08 |
≤0.025 |
≤0.025 |
≤0.9 |
13-15 |
≤0.75 |
6-8.5 |
The rest |
≤0.3 |
≤0.05 |
≤0.1 |
≤0.05 |
≤0.05 |
0.5-1 |
≤0.2 |
| GOST 977-88 |
≤0.08 |
≤0.03 |
≤0.03 |
0.3-0.9 |
13-15 |
0.2-0.75 |
6-8.5 |
The rest |
- |
- |
- |
- |
- |
0.5-1 |
- |
| GOST 2176-77 |
≤0.08 |
≤0.03 |
≤0.03 |
0.3-0.9 |
13-15 |
0.2-0.75 |
6-8.5 |
The rest |
≤0.3 |
- |
- |
- |
- |
0.5-1 |
- |
Fe is the basis.
According to OST 1 90090-79, the content of nitrogen in the steel is allowed up to 0.070%.
According to GOST 2176-77 the chemical composition is given for steel grade 08H14N7ML. Deviations from the norms of chemical composition are allowed: for carbon ± 0.020%; for silicon ± 0.10%; on manganese, copper, chromium and nickel ± 0.10% each; by titanium and tungsten ± 0.050% each; by vanadium, molybdenum and niobium ± 0.020% each.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
| Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91 |
| - |
- |
980-1270 |
- |
- |
- |
302-363 |
| The casting and the ceramic mold. Hardening in air, 1100-1120 °C, cold treatment at -70 °C (2 hours) + vacation at 250-350 °C (2 hours), air cooling |
| - |
≥687 |
≥981 |
≥12 |
≥30 |
≥392 |
302-363 |
| Casting. Hardening in air, 1090-1110 °C (heating in a protective environment)+ cold treatment at minus 50 °to 70 ° C + vacation at 250-350 °C, air cooling |
| 100 |
≥687 |
≥981 |
≥10 |
≥25 |
≥294 |
- |
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 |
| d |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |