Steel 40L

Designation

Name The value
Designation GOST Cyrillic 40Л
Designation GOST Latin 40L
Transliteration 40L
By chemical elements 40

Description

Steel 40L is used: for the manufacture of machine beds, housings, couplings, brake discs, gears, casings, forks, sprockets and other parts operating at temperatures up to 400 °C; tsentrobezhnolityh pipes used as components in equipment for metallurgical, engineering, glass, ceramic, mining and processing petrochemical industry and is intended for the manufacture of blanks and parts used in the composition of the products of aviation and the nuclear industry.

Standards

Name Code Standards
Steel castings В82 GOST 977-88, OST 24.920.01-80, OST 3-4365-79
Classification, nomenclature and General rules В20 OST 84-218-85
Steel pipes and fittings to them В62 TU 1333-003-76886532-2014
Castings with special properties (iron and steel) В83 TU 4112-78269737-008-05

Chemical composition

Standard C S P Mn Si Fe
TU 1333-003-76886532-2014 0.37-0.45 ≤0.04 ≤0.04 0.45-0.9 0.2-0.52 Rest
Fe is the basis.
The mass fraction of S and P content is indicated for 1 group of castings from the base steel. The content of sulfur and phosphorus in the castings of groups 2 and 3, in sour and basic open-hearth steel - see Table 4a in GOST 977-88.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa
Casting. Quenching with 860-880 °C + vacation at 600-630 °C
100 ≥343 ≥540 ≥14 ≥20 ≥294 -
Casting. Normalization at 860-880 °C + vacation at 600-630 °C
100 ≥294 ≥520 ≥14 ≥25 ≥294 146-173

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
HB Brinell hardness number

Physical characteristics

Temperature r, kg/m3 l, W/(m · °C) a, 10-6 1/°C С, J/(kg · °C)
0 7810 - - -
20 7810 - - -
100 - 60 124 470
200 - 53 124 470
400 - 47 126 483
500 - 41 - -
600 - - 145 525
800 - - 146 571

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 limited weldability. Welding methods: SMAW, ADS under gas protection electroslag welding. Recommended heating and subsequent heat treatment.
Склонность к отпускной хрупкости tend not
Flock-sensitive sensitivity not sensitive
Machinability In heat-treated state at 200 Kn NV TV.SPL.=1.1 Kn b.St.=1