Steel 50L
Designation
Name |
The value |
Designation GOST Cyrillic |
50Л |
Designation GOST Latin |
50L |
Transliteration |
50L |
The chemical elements |
50 |
Description
50L steel is used: for the manufacture of gears, sliders, wheels, gears, lifting machines, rolls of large-, medium -, and small-section mills for rolling soft metal and other working parts for wear.
Note
Steel 50L is used in the normalized or improved state and after surface hardening with heating HDTV.
Standards
Name |
Code |
Standards |
Castings, steel |
В82 |
GOST 977-88, OST 24.920.01-80, OST 3-4365-79, OST 5Р.9285-95 |
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 |
0.47-0.55 |
≤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 |
d |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
Hardening in air, 860-880 °C + vacation at 600-630 °C |
100 |
≥392 |
≥736 |
≥14 |
≥20 |
≥294 |
- |
Normalization at 860-880 °C, air cooling to 300-350 °C, exposure 2 h + vacation at 600-620 °C (extract 3 hours), cooled for 1 h in a furnace to 500 °C, air cooling (named place of clippings sample) |
100 |
280-340 |
630-710 |
14-17 |
13-19 |
- |
206-229 |
Normalization at 860-880 °C + vacation at 600-630 °C |
100 |
≥334 |
≥569 |
≥11 |
≥20 |
≥245 |
159-240 |
Normalization at 860-880 °C, air cooling to 300-350 °C, exposure 2 h + vacation at 600-620 °C (extract 3 hours), cooled for 1 h in a furnace to 500 °C, air cooling (named place of clippings sample) |
10 |
295-355 |
650-680 |
15-21 |
13-27 |
- |
- |
Annealing at 850-870 °C, cooling with furnace + normalization at 870-880 °C + vacation at 600-650 °C, air cooling |
30 |
≥335 |
≥570 |
≥11 |
≥20 |
≥240 |
≥174 |
Normalization at 860-880 °C, air cooling to 300-350 °C, exposure 2 h + vacation at 600-620 °C (extract 3 hours), cooled for 1 h in a furnace to 500 °C, air cooling (named place of clippings sample) |
100 |
270-360 |
620-710 |
13-15 |
14-17 |
- |
229 |
30 |
290-325 |
650-690 |
15-19 |
19-25 |
- |
170-187 |
Castings for shipbuilding. Normalization at 850-880 °C + vacation at 630-670 °C, air cooling |
- |
≥340 |
≥580 |
≥11 |
≥18 |
≥250 |
170-199 |
Normalization at 860-880 °C, air cooling to 300-350 °C, exposure 2 h + vacation at 600-620 °C (extract 3 hours), cooled for 1 h in a furnace to 500 °C, air cooling (named place of clippings sample) |
50 |
265-275 |
610-630 |
16-21 |
19-28 |
- |
162-170 |
After normalization and tempering quenching in oil 860-870 °C + vacation at 620-630 °C (extract 3 hours), air cooling (named place of clippings sample) |
100 |
420-470 |
750-760 |
19-23 |
34-44 |
- |
216-229 |
200 |
375-430 |
670-750 |
17-23 |
32-61 |
- |
206 |
10 |
480-530 |
760-780 |
16-21 |
36-41 |
- |
216-229 |
100 |
395-440 |
710-750 |
18-21 |
44-54 |
- |
229 |
200 |
375-390 |
680-710 |
12-18 |
44-54 |
- |
229 |
30 |
420-475 |
720-770 |
18-27 |
40-59 |
- |
216-229 |
50 |
400-440 |
710-750 |
16-24 |
54-56 |
- |
206-229 |
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 |
Е, ГПа |
G, ГПа |
r, кг/м3 |
l, Вт/(м · °С) |
R, НОм · м |
a, 10-6 1/°С |
С, Дж/(кг · °С) |
0 |
219 |
85 |
7820 |
48 |
191 |
- |
- |
20 |
219 |
- |
7820 |
48 |
191 |
- |
- |
100 |
214 |
83 |
- |
48 |
240 |
12 |
479 |
200 |
208 |
81 |
- |
46 |
321 |
124 |
500 |
300 |
196 |
76 |
- |
44 |
407 |
128 |
517 |
400 |
178 |
69 |
- |
41 |
509 |
133 |
542 |
500 |
170 |
65 |
- |
38 |
631 |
137 |
559 |
600 |
155 |
59 |
- |
34 |
779 |
141 |
584 |
700 |
136 |
52 |
- |
30 |
941 |
145 |
617 |
800 |
122 |
46 |
- |
25 |
1139 |
124 |
727 |
900 |
- |
- |
- |
26 |
1170 |
124 |
727 |
1100 |
- |
- |
- |
- |
- |
133 |
710 |
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 |
limited weldability. Requires pre-heating and subsequent heat treatment. |