Steel 40X24H12SL
Steel 40Cr24Ni12SL.
Steel 40Cr24N12SL: steel and alloys classifier. Below is systematized information on the purpose, chemical composition, types of supply, substitutes, critical point temperatures, physical, mechanical, technological and foundry properties for the grade — Steel 40Cr24Ni12SL.
General information about 40X24H12SL steel
| Grade substitute |
| steel 35Х23Н7СЛ. |
| Delivery type |
| GOST 2176−77 castings. |
| Application |
| Parts operating at high temperature and pressure (compressor and nozzle blades, furnace conveyors, screws, fasteners, etc.). The steel is corrosion-resistant, heat-resistant up to 1000 °C, heat-resistant of austenite-ferrite class. |
Chemical composition of steel 40Х24Н12СЛ
| Chemical element |
% |
| Silicon (Si) |
0.50−1.50 |
| Manganese (Mn) |
0.30−0.80 |
| Copper (Cu), not more |
0.30 |
| Nickel (Ni) |
11.0−13.0 |
| Sulfur (S), not more than |
0.030 |
| Carbon ©, not more than |
0.40 |
| Phosphorus (P), not more than |
0.035 |
| Chrome (Cr) |
22.0−26.0 |
Mechanical properties of steel 40Х24Н12СЛ
Mechanical properties
| Heat treatment, delivery condition |
Section, mm |
σ0.2, MPa |
σB, MPa |
δ5, % |
ψ, % |
| Tempering at 1050 °C, water, oil or air |
<100 |
250 |
500 |
20 |
28 |
| Cast state |
|
215−235 |
550−610 |
24−38 |
29−49 |
Mechanical properties at elevated temperatures
| t test,°C |
σ0, 2, MPa |
σB, MPa |
δ5, % |
ψ, % |
KCU, J/m2 |
| 1150 °C hardening, water. |
| 20 |
295 |
590 |
45 |
60 |
|
| 540 |
|
470 |
41 |
62 |
|
| 760 |
|
265 |
46 |
51 |
|
| 815 |
|
205 |
40 |
52 |
|
| Cyclic annealing for 3500−5000 h. Cycle: heating to 950 °C for 8 hours, holding for 8 hours, cooling to room temperature for 8 hours |
| 20 |
245−315 |
410−620 |
7−30 |
11−32 |
23−39 |
| 800 |
170−200 |
285−335 |
8−20 |
6−30 |
|
| 900 |
78−88 |
98−110 |
19−26 |
26−36 |
|
| 950 |
59 |
69−78 |
18−34 |
5−28 |
|
Mechanical properties in the long term strength test
| Creep limit, MPa |
Creep rate, %/h |
t test,°C |
Ultimate long-term strength, MPa |
Test duration, h |
t test, h |
| 65 |
1/10000 |
700 |
500 |
800 |
51 |
| 22 |
1/10000 |
875 |
1000 |
800 |
44 |
| 7 |
1/10000 |
1000 |
500 |
875 |
37 |
| 6 |
0.5/100000 |
1000 |
1000 |
875 |
33 |
Technological properties of steel 40Х24Н12СЛ
| Weldability |
| РDS welding method. |
| Manageability by cutting |
| Kυ tv.spl. = 0,3. |
| Tendency to tempering ability |
| is not inclined |
| Flockensitivity |
| not sensitive |
Heat resistance of steel 40Х24Н12СЛ
| Medium |
Temperature,°C |
Depth, mm/year |
Resistance group or grade |
| Air |
900 |
0,055 |
5 |
| Air |
1000 |
0,322 |
6 |
| Air |
1050 |
1,660 |
8 |
Physical properties of 40X24H12SL steel
| Test temperature,°C |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Modulus of normal elasticity, E, GPa |
196 |
|
|
|
|
167 |
157 |
145 |
|
|
| Steel density, pn, kg/m3 |
7800 |
|
|
|
|
|
|
|
|
|
| Electrical resistivity (p, nominal value — m) |
860 |
|
|
|
|
|
|
|
|
|
| Test temperature,°C |
20−100 |
20−200 |
20−300 |
20−400 |
20−500 |
20−600 |
20−700 |
20−800 |
20−900 |
20−1000 |
| Coefficient of linear expansion (a, 10−6 1/°C) |
18.4 |
|
|
|
|
|
|
|
|
20.6 |
Casting properties of steel 40Х24Н12СЛ
