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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.

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