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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.

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