Steel 15L
Designation
| Name |
The value |
| Designation GOST Cyrillic |
15Л |
| Designation GOST Latin |
15L |
| Transliteration |
15L |
| The chemical elements |
15 |
Description
15L steel is used: for the manufacture of pile drivers women, rollers, housings, leashes, grips, saw frames, details of welded-cast structures with a large amount of welding, plates, pillows, and other non-critical parts, working medium under the action of static and dynamic loads; the castings 1, 2 and 3 parts of valves and actuators to it (details of the magnetic, covers, caps, electromagnetic actuators and valves), working in different environments at temperatures from -40 to +400 °C and a nominal pressure up to 6.3 MPa (63 kgf/cm2); casting equipment parts (valves) for nuclear power stations, heat supply stations, heat and power plants, experimental and research nuclear reactors and installations.
Standards
| Name |
Code |
Standards |
| Castings, steel |
В82 |
GOST 977-88, OST 26-07-402-83, OST 24.920.01-80, OST 3-4365-79, TU 26-02-19-75, TU 108.11.352-87, ST ЦКБА 014-2004, TU 5.961-11151-92 |
| Welding and cutting of metals. Soldering, riveting |
В05 |
RTM 108.020.122-78 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Si |
Fe |
| GOST 977-88 |
0.12-0.2 |
≤0.04 |
≤0.04 |
0.45-0.9 |
0.2-0.52 |
The rest |
| TU 5.961-11151-92 |
0.12-0.2 |
≤0.025 |
≤0.025 |
0.45-0.9 |
0.2-0.52 |
The rest |
Fe is the basis.
According to GOST 977-88 the mass fraction of S and P content is indicated for 1 group of castings from the main 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.
According to TU 5.961-11151-92 for castings of grades 1 and 2 the mass fraction of cobalt in steel should not exceed 0.20%, and for castings in the direct irradiation zone - 0.15%.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
| Casting. Normalization at 910-930 °C or Normalizing at 910-930 °C + Vacation at 670-690 °C |
| 100 |
≥196 |
≥392 |
≥24 |
≥35 |
≥491 |
- |
| Castings with wall thickness up to 100 mm in the delivery state on the other 5.961-11151-92. Normalization at 910-930 °C + Vacation at 670-690 °C |
| - |
≥196 |
≥392 |
≥24 |
≥35 |
≥490 |
109-136 |
| - |
≥160 |
≥370 |
- |
≥34 |
- |
- |
| - |
≥140 |
≥350 |
- |
≥32 |
- |
- |
| - |
≥120 |
≥340 |
- |
≥30 |
- |
- |
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 |
| d |
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 |
7820 |
- |
- |
- |
| 20 |
7820 |
- |
- |
- |
| 100 |
- |
78 |
119 |
470 |
| 200 |
- |
67 |
119 |
470 |
| 400 |
- |
48 |
136 |
479 |
| 500 |
- |
41 |
136 |
- |
| 300 |
- |
- |
125 |
- |
| 700 |
- |
- |
142 |
- |
| 600 |
- |
- |
- |
517 |
| 800 |
- |
- |
- |
571 |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| r |
Density |
| l |
Coefficient of thermal conductivity |
| С |
Specific heat |
Technological properties
| Name |
The value |
| Weldability |
Welded without any restrictions. Welding methods: SMAW, ADS under gas protection electroslag welding. After repair of defects by welding is applied leave in 619-660 °C. |
| Propensity to temper brittleness |
Tend not. |
| Flock-sensitive sensitivity |
not sensitive. |
| Defect welding |
Welding defects of castings after cutting is usually carried out without prior and concomitant heating. By semiautomatic 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 Э42А type (GOST 9467) brand SSSI-13/45. When welding the hard contour of the casting or of the sample volume more than 2000 cm3 is recommended before applying the first roller to pre-heating at 120-150 °C. When welding is sample size more than 5000 cm3 it is necessary to produce preliminary and accompanying heating to 150-180 °C. |
