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Steel 40Г18Ю3Ф (Ю3Ф)

Designation

Name The value
Designation GOST Cyrillic 40Г18Ю3Ф
Designation GOST Latin 40G18Ju3F
Transliteration 40G18Yu3F
The chemical elements 40Mn18Al3V
Name The value
Designation GOST Cyrillic Ю3Ф
Designation GOST Latin Ju3F
Transliteration Yu3F
The chemical elements Al3V

Description

40Г18Ю3Ф steel is used: for the manufacture of long products and forgings; hull structures of ships, vessels and goods marine equipment with static and cyclic loads without friction (shafts, spindles, axles, worm and gear wheels of low-speed mechanisms, hubs, couplings, power studs, springs, Cams, fingers, parts of motors).

Note

Low austenitic steel.
Steel is not intended for use in aggressive environments.
Steel dispersion-hardened state has a low frictional properties and wear resistance and friction is not applied.
Magnetic permeability μ ≤ 1,01 GS/e and is almost constant in any thermal and thermomechanical processing.
High strength steel is provided by heat treatment due to the dispersion hardening — selection of dispersed carbides of vanadium.

Standards

Name Code Standards
Castings from non-ferrous metals and alloys В84 RD 9257-76
Sectional and shaped rolling В32 TU 14-1-1773-76

Chemical composition

Standard C S P Mn Cr Si Ni Fe Al V
TU 14-1-1773-76 0.35-0.45 ≤0.03 ≤0.04 17.5-19.5 ≤0.5 ≤0.6 ≤0.5 The rest 2.6-3.5 1-1.3
RD 9257-76 0.35-0.45 ≤0.03 ≤0.04 17.5-19.5 ≤0.5 ≤0.6 ≤0.5 The rest 2.6-3.5 1-1.3
Fe is the basis.

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa d5, % y, %
Forged round and square. Quenching in water from 1120 °C to + Vacation at 675 °C, air cooling
100-180 ≥687 ≥834 ≥10 ≥15
Long products hot-rolled steel. Without heat treatment
30-70 ≥687 ≥834 ≥10 ≥15

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

Physical characteristics

Temperature Е, ГПа r, кг/м3 l, Вт/(м · °С) R, НОм · м a, 10-6 1/°С С, Дж/(кг · °С)
20 1716 7550 - 950 - -
200 - - 1633 - 1840 -
300 - - 1842 - 1940 -
400 - - 2051 - 2030 -
500 - - 2261 - 2120 -
600 - - 2470 - 2150 -
100 - - - - 1700 5443
700 - - - - 2200 -

A description of the physical symbols

Name Description
Е The normal elasticity modulus
r Density
l Coefficient of thermal conductivity
R UD. the resistivity

Technological properties

Name The value
Weldability steel is not welded.
Workability by cutting The complexity of drilling, and turning of steel Ю3Ф in the initial state without heat treatment at 50% less than steel Ю45Г17Ю3 (Yu3), and in face milling for 20% less. The machinability of the steel after heat treatment 15% lower than that of steel 45Г17Ю3 (Yu3).

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