Steel 40KH24N12SL (30Х24Н12СЛ)

Designation

Name The value
Designation GOST Cyrillic 40Х24Н12СЛ
Designation GOST Latin 40X24H12CL
Transliteration 40H24N12SL
By chemical elements 40Cr24Н12С
Name The value
Designation GOST Cyrillic 30Х24Н12СЛ
Designation GOST Latin 30X24H12CL
Transliteration 30H24N12SL
By chemical elements 30Cr24Н12С

Description

40KH24N12SL steel is used: for the manufacture of castings of parts operating at high temperature and pressure (compressors and blades of the nozzle apparatus, furnace conveyors, screws, fasteners, etc.); hinged cast chains for rotary kilns, consisting of high-temperature or heat-resistant parts applied in the middle area when the temperature of the gas stream +500−1000 °C.

Note

Steel austenitic-ferritic, corrosion resistant, heat-resistant and heat-resistant (up to +1000 °C).

Standards

Name Code Standards
Castings with special properties (iron and steel) В83 GOST 2176-77, TU 4112-07507311-010-02
Steel castings В82 GOST 977-88, OST 24.920.01-80
Thermal and thermochemical treatment of metals В04 STP 26.260.484-2004

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu
GOST 977-88 ≤0.4 ≤0.03 ≤0.035 0.3-0.8 22-26 0.5-1.5 11-13 Rest -
GOST 2176-77 ≤0.4 ≤0.03 ≤0.035 0.3-0.8 22-26 0.5-1.5 11-13 Rest ≤0.3
Fe is the basis.
According to GOST 2176-77 the chemical composition is given for steel grade 40Х24Н12СЛ. Deviations from the norms of chemical composition are allowed: for carbon ± 0.020%; for silicon ± 0.10%; on manganese, copper, chromium and nickel ± 0.10% each; by titanium and tungsten ± 0.050% each; by vanadium, molybdenum and niobium ± 0.020% each.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2
Casting without heat treatment (depending on the type of casting)
- 215-235 550-610 24-38 29-49 340-780
Quenching in water from 1150 °C
- 295 590 45 60 -
Casting for STP 26.260.484-2004. Quenching in water, oil or air with 1030-1070 °C
≥250 ≥500 ≥20 ≥28 ≥294
Quenching in water from 1150 °C
- - 470 41 62 -
Casting. Quenching in water, oil or air with 1040-1060 °C
100 ≥245 ≥491 ≥20 ≥28 -
Quenching in water from 1150 °C
- - 265 46 51 -
- - 205 40 52 -
Cyclic annealing for 3500-5000 h Cycle: heating to 950 °C (8 h exposure), cooling to room temperature, 8 h.
- 245-315 410-620 7-30 11-32 -
- 170-200 285-335 8-20 6-30 -
- 78-88 98-110 19-26 26-36 -
- 59 69-78 18-34 5-28 -

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
KCU Toughness

Physical characteristics

Temperature Е, HPa r, kg/m3 R, Mr. · m a, 10-6 1/°C
0 196 7800 860 -
20 196 7800 860 -
500 167 - - -
600 157 - - -
700 145 - - -
100 - - - 184
300 - - - 184
1200 - - - 206

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 welding method SMAW.
Склонность к отпускной хрупкости tend not
Flock-sensitive sensitivity not sensitive
Machinability Kn TV.SPL.=0,3
Features of heat treatment Steel castings to eliminate the tendency to intergranular corrosion are subjected to hardening regime: heating to 1035-1065 °C, exposure during heating for quenching for products with wall thickness up to 10 mm - 30 min, over 10 mm — 20 min + 1 min per 1 mm max thickness cooling in water or oil depending on the thickness of the material and configuration of the product. Products austenite-ferritic steels do not require heat treatment after welding.