Steel 40KH24N12SL (30Х24Н12СЛ)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
40Х24Н12СЛ |
| Designation GOST Latin |
40X24H12CL |
| Transliteration |
40H24N12SL |
| The chemical elements |
40Cr24Н12С |
| Name |
The value |
| Designation GOST Cyrillic |
30Х24Н12СЛ |
| Designation GOST Latin |
30X24H12CL |
| Transliteration |
30H24N12SL |
| The 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 (cast iron and steel) |
В83 |
GOST 2176-77, TU 4112-07507311-010-02 |
| Castings, steel |
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 |
The rest |
- |
| GOST 2176-77 |
≤0.4 |
≤0.03 |
≤0.035 |
0.3-0.8 |
22-26 |
0.5-1.5 |
11-13 |
The 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 characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
| 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 |
| 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 |
Е, ГПа |
r, кг/м3 |
R, НОм · м |
a, 10-6 1/°С |
| 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. |
| Propensity to temper brittleness |
tend not |
| Flock-sensitive sensitivity |
not sensitive |
| Workability by cutting |
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. |
