Steel 30L
Designation
| Name |
The value |
| Designation GOST Cyrillic |
30Л |
| Designation GOST Latin |
30L |
| Transliteration |
30L |
| The chemical elements |
30 |
Description
30L steel is used: for the manufacture of levers, balance wheels, gear housings, couplings, pulleys, brackets, parts of welded-cast structures, bowls and cones of the charging apparatus, beds, beams, support rings, tires, flywheels and other parts operating under the influence of average static and dynamic loads; casting parts, steam, gas, hydraulic turbines, and axial compressors.
Standards
| Name |
Code |
Standards |
| Castings, steel |
В82 |
GOST 977-88, OST 24.920.01-80, OST 3-4365-79, TU 108-23.45-88, TU 108-978-80 |
| Classification, nomenclature and general norms |
В20 |
OST 84-218-85 |
| Welding and cutting of metals. Soldering, riveting |
В05 |
RTM 108.020.122-78 |
| Castings with special properties (cast iron and steel) |
В83 |
TU 4112-78269737-008-05 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Si |
Fe |
| GOST 977-88 |
0.27-0.35 |
≤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 |
| Casting. Quenching with 860-880 °C + vacation at 610-630 °C |
| 100 |
≥294 |
≥491 |
≥17 |
≥30 |
≥343 |
| Normalization at 900 °C + quenching from 800 °C + vacation at 580 °C (named place of clippings sample) |
| - |
320-330 |
545-550 |
20-25 |
28-30 |
- |
| Casting. Normalization at 880-900 °C + vacation at 610-630 °C |
| 100 |
≥255 |
≥471 |
≥17 |
≥30 |
≥343 |
| Normalization at 900 °C + quenching from 800 °C + vacation at 580 °C (named place of clippings sample) |
| - |
320-340 |
540-560 |
16-17 |
27-31 |
- |
| Normalization at 900 °C + vacation at 580 °C (named place of clippings sample) |
| - |
320-330 |
545-550 |
20-25 |
28-30 |
- |
| - |
310-320 |
530-535 |
14-16 |
20-21 |
- |
| Annealing at 900 °C + normalization at 900 °C + vacation at 600 °C (named place of clippings sample) |
| - |
255 |
480 |
28 |
44 |
- |
| - |
230 |
430 |
25 |
35 |
- |
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 |
- |
76 |
126 |
470 |
| 200 |
- |
65 |
126 |
470 |
| 400 |
- |
44 |
15 |
483 |
| 500 |
- |
38 |
15 |
- |
| 300 |
- |
- |
139 |
- |
| 700 |
- |
- |
156 |
- |
| 600 |
- |
- |
- |
525 |
| 800 |
- |
- |
- |
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 the annealed condition with HB of 160 Kn TV.SPL.=1,25 Kn b.St.=1,0. |
| Defect welding |
Welding defects of castings after cutting is carried out with preliminary and attendant heating to 150-200 °C. for semi-automatic welding in carbon dioxide environment used welding wire SV-08G2S diameter of 2 mm at a current of 380-420 A. Welding defects by manual welding is done with electrodes Э50А type (GOST 9467) brand SSSI-13/55. Before mechanized welding of large defects of the edge samples, it is recommended to coat the electrodes of these brands. The thickness of the facing layer of 8-10 mm. After welding should slow cooling with rate 50 °C/h. |
