Steel 08KH14N7ML (VNL-1; 5Х14Н7МЛ)

Designation

Name The value
Designation GOST Cyrillic 08Х14Н7МЛ
Designation GOST Latin 08X14H7ML
Transliteration 08H14N7ML
By chemical elements 08Cr14Н7Mo
Name The value
Designation GOST Cyrillic ВНЛ-1
Designation GOST Latin BHL-1
Transliteration VNL-1
By chemical elements WНBe-1
Name The value
Designation GOST Cyrillic 5Х14Н7МЛ
Designation GOST Latin 5X14H7ML
Transliteration 5H14N7ML
By 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 (iron and steel) В83 GOST 2176-77, OST 1 90090-79
Steel castings В82 GOST 977-88, OST 1 80059-83
Bars and shapes 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 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 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 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 properties

Section, mm sT|s0,2, MPa σU, MPa d y, % KCU, kJ/m2 HB, 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
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d Elongation after rupture
y The relative narrowing
KCU Toughness
HB Brinell hardness number