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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

Linear shrinkage, % 2.7