15KH11MF steel is used: for the production workers and guides turbine blades, forgings, tires and other parts, long operating at temperatures up to +580 °C.

Note

Steel heat-resistant martensitic class.
The recommended maximum operating temperature for a long time — up to 580 °C. the Temperature of intensive scaling in air +750 °C.

Standards

Name	Code	Standards
Classification, nomenclature and General rules	В30	GOST 5632-72
Bars and shapes	В32	GOST 5949-75, GOST 18968-73, GOST 19442-74, TU 14-11-245-88
Blanks. Of the workpiece. Slabs	В31	OST 108.020.03-82, OST 3-1686-90
Processing of metals by pressure. Forgings	В03	TU 0306.018-80

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Fe	Cu	V	Ti	Mo	W
GOST 5632-72	0.12-0.19	≤0.025	≤0.03	≤0.7	10-11.5	≤0.5	Rest	≤0.3	0.25-0.4	≤0.2	0.6-0.8	≤0.2

Fe is the basis.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa
Bars and strip hot rolled and forged GOST 18968-73. Normalization or annealing at 1050-1100 °C, air cooling or oil + Leave in 660-770 °C, air cooling
	590-755	≥740	≥15	≥50	≥588	229-269
Bars hot rolled and forged according to GOST 5949-75. Quenching in oil with 1030-1060 °C + Vacation at 700-740 °C, cooling in oil
	≥490	≥690	≥15	≥55	≥588	-
Contoured rods (g/K, x/K and x/t for steam turbine blades; x/a and x/t for coupling blades of steam turbines) according to GOST 19442-74. Annealing in air or in oil with 1050-1100 °C + Vacation at 660-770 °C, air cooling (specified strength)
	539-656	686-882	≥15	≥50	≥588	217-255
	588-754	735-931	≥15	≥50	≥588	229-269
	666-784	813-980	≥13	≥40	≥392	255-286

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
HB	Brinell hardness number

Physical characteristics

Temperature	Е, HPa	r, kg/m³	l, W/(m · °C)	a, 10^-6 1/°C	С, J/(kg · °C)
20	228	7850	-	-	-
100	222	-	-	103	500
200	213	-	244	106	525
300	205	-	261	108	567
400	193	-	272	113	630
500	180	-	276	117	700
600	-	-	28	12	800
700	-	-	-	122	-
800	-	-	-	124	-

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	difficult weldability

Steel 15KH11MF (1Х11МФ)

Designation

Description