38KH2N2MA steel is used: for the manufacture of shafts, rods, bolts, hairpins, rings of turbogenerators and other large critical heavily loaded parts of complex configuration used in the superior condition; for the manufacture of pipes tsentrobezhnolityh for the manufacture of the coils of the tubular furnace installations production of ammonia, hydrogen, ethylene, carbon disulphide, etc., operating in the temperature range 760−1060 °C and a pressure of 3.92 MPa (40 kgf/cm²); solid-rolled rings for different purposes.

Note

Structural steel high-quality romancelatina heat-resistant and corrosion-resistant.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 103-2006
Bars and shapes	В32	GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, OST 1 92049-76, TU 14-1-2118-77, TU 14-11-245-88, TU 14-136-367-2008
Bars and shapes	В22	GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Processing of metals by pressure. Forgings	В03	GOST 8479-70, OST 5Р.9125-84, ST ЦКБА 010-2004
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-4944-90
Steel pipes and fittings to them	В62	TU 1333-047-00220302-02

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo
GOST 4543-71	0.33-0.4	≤0.025	≤0.025	0.25-0.5	1.3-1.7	0.17-0.37	1.3-1.7	Rest	≤0.3	≤0.05	≤0.03	0.2-0.3

Fe is the basis.
GOST 4543-71 regulates the content of high-quality steel: P≤0,025%; S≤0.015%; Сu≤0.25%. When changing the alloying Mo to W, the steel has the designation 38Х2Н2ВА.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d	d₁₀	y, %	KCU, kJ/m²	HB, MPa	HRC
Quenching in oil from 850 °C + vacation
-	200	1520	1810	11	-	-	46	432	-	53
-	300	1420	1630	10	-	-	45	363	-	49
-	400	1350	1470	10	-	-	46	383	-	46
-	500	1190	1240	13	-	-	55	667	-	40
-	600	880	960	17	-	-	64	1344	-	32
Ring forged in OST 1 92049-76. Quenching in oil with 855-885 °C + Vacation at 530-630 °C, air cooling or oil
25	-	≥890	≥1030	≥9	-	-	≥40	≥588	-	-
Quenching in oil from 860 °C to + vacation at 560 °C, cooling in water (named place of clippings of sample) [130]
120-200	-	770	930	17	-	-	57	-	-	-
Quenching + tempering (forgings)
-	-	440	635	11	-	-	30	383	197-235	-
Long products (wire). Quenching in oil from 870 °C to + Vacation at 580 °C air cooling or oil
25	-	≥930	≥1080	≥12	-	-	≥50	≥765	-	-
Quenching in oil from 860 °C to + vacation at 560 °C, cooling in water (named place of clippings of sample) [130]
80-120	-	770	940	18	-	-	61	-	-	-
Quenching + tempering (forgings)
-	-	735	880	13	-	-	40	579	277-321	-
Tsentrobezhnolityh pipe outer diameter 85-320 mm. Quenching in water or air from 1100-1150 °C
	-	≥170	≥420	-	≥30	-	-	-	-	-
Quenching in oil from 860 °C to + vacation at 560 °C, cooling in water (named place of clippings of sample) [130]
120-200	-	750	900	17	-	-	52	-	-	-
Quenching + tempering (forgings)
-	-	785	930	12	-	-	40	579	293-331	-
Quenching in oil from 860 °C to + vacation at 560 °C, cooling in water (named place of clippings of sample) [130]
20-30	-	860	1000	19	-	-	64	-	-	-
30-50	-	830	970	16	-	-	61	-	-	-
50-80	-	750	900	18	-	-	61	-	-	-
80-120	-	740	900	19	-	-	60	-	-	-
Quenching in oil from 950 °C to + vacation at 580-600 °C (specify the place and the cutting direction of sample)
300-500	-	760	930	-	-	11	23	-	-	-
500-700	-	730	880	-	-	11	20	-	-	-
700-900	-	700	870	-	-	11	22	-	-	-
300-500	-	770	960	-	-	17	55	-	-	-
500-700	-	740	930	-	-	17	52	-	-	-
700-900	-	700	890	-	-	16	49	-	-	-
300-500	-	740	930	-	-	11	-	-	-	-
500-700	-	790	900	-	-	-	-	-	-	-
700-900	-	690	730	-	-	-	6	-	-	-
300-500	-	760	930	-	-	15	52	-	-	-
500-700	-	740	900	-	-	17	51	-	-	-
700-900	-	710	850	-	-	7	16	-	-	-

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
d	Elongation after rupture
d₁₀	Elongation after rupture
y	The relative narrowing
KCU	Toughness
HB	Brinell hardness number
HRC	Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature	Е, HPa	G, HPa	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
0	213	84	38	322	-	-
20	213	-	38	322	-	-
100	206	80	37	398	119	490
200	194	76	35	482	125	502
300	180	71	35	592	131	523
400	174	67	33	740	133	532
500	164	63	32	910	138	565
600	157	59	30	1090	141	560
700	141	59	28	1300	146	615
800	129	48	28	-	146	615
1000	-	-	-	-	118	670

A description of the physical symbols

Name	Description
Е	The normal elasticity modulus
G	Modulus of elasticity shear torsion
r	Density
l	Coefficient of thermal conductivity
R	UD. the resistivity
С	Specific heat

Technological properties

Name	The value
Weldability	does not apply to welded structures.
Склонность к отпускной хрупкости	tend not
The temperature of forging	Start - 1200 °C, the end - of 800 °C. Alpigena slow.
Flock-sensitive sensitivity	sensitive

Steel 38KH2N2MA (38ХНМА)

Designation

Description