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	s_T\|s_0,2, MPa	σ_U, 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
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	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.

Steel 40KH24N12SL (30Х24Н12СЛ)

Designation

Description