Steel 40L
Designation
| Name |
The value |
| Designation GOST Cyrillic |
40Л |
| Designation GOST Latin |
40L |
| Transliteration |
40L |
| The 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 |
| Castings, steel |
В82 |
GOST 977-88, OST 24.920.01-80, OST 3-4365-79 |
| Classification, nomenclature and general norms |
В20 |
OST 84-218-85 |
| Pipes steel and connecting parts to them |
В62 |
TU 1333-003-76886532-2014 |
| Castings with special properties (cast 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 |
The 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 characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, 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 |
| 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 |
| kJ/m2 |
Toughness |
Physical characteristics
| Temperature |
r, кг/м3 |
l, Вт/(м · °С) |
a, 10-6 1/°С |
С, Дж/(кг · °С) |
| 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. |
| Propensity to temper brittleness |
tend not |
| Flock-sensitive sensitivity |
not sensitive |
| Workability by cutting |
In heat-treated state at 200 Kn NV TV.SPL.=1.1 Kn b.St.=1 |
