Steel 38H2MYUA (38ХМЮА)

Designation

Name	The value
Designation GOST Cyrillic	38Х2МЮА
Designation GOST Latin	38X2MJuA
Transliteration	38H2MYuA
By chemical elements	38Cr2MoAl

Name	The value
Designation GOST Cyrillic	38ХМЮА
Designation GOST Latin	38XMJuA
Transliteration	38HMYuA
By chemical elements	38CrMoAl

Description

Steel 38H2MYUA used: for the manufacture of rods of valves of steam turbines, operating at temperatures up to +450 °C; cylinder liners of internal combustion engines of the injection needle, plates, books, sprays, fingers, plungers, camshaft rollers, gears, shafts, bushings and other parts; elements of rocket and aircraft engines; parts of pipelines with quenching in oil and tempering in oil or water; nitride parts aircraft; solid-rolled rings for different purposes.

Note

Structural steel high-quality homalomena molybdenum.
In the manufacture of steel 38H2MYUA often using a nitriding process.

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 14-1-2765-79, TU 14-1-658-73, TU 14-1-950-74, TU 14-1-3238-81, TU 14-11-245-88, TU 14-1-3238-2006, TU 14-1-1271-75, 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
Steel pipes and fittings to them	В62	GOST 21729-76, GOST 23270-89, TU 14-3-1443-86, TU 14-3-675-78, TU 14-159-227-93
Classification, nomenclature and General rules	В20	OST 1 90005-91
Blanks. Of the workpiece. Slabs	В21	OST 14-13-75
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-4944-90, TU 14-1-564-73, TU 1-92-156-90
Processing of metals by pressure. Forgings	В03	OST 5Р.9125-84, TU 0306.018-80, ST ЦКБА 010-2004
Thermal and thermochemical treatment of metals	В04	ST ЦКБА 026-2005

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	Al	V	Ti	Mo	W
TU 14-1-2765-79	0.35-0.42	≤0.012	≤0.016	0.3-0.6	1.35-1.65	0.2-0.45	≤0.3	Rest	≤0.25	0.7-1.1	≤0.1	≤0.03	0.15-0.25	≤0.2
TU 14-1-950-74	0.35-0.42	≤0.025	≤0.025	0.3-0.6	1.35-1.65	0.2-0.45	≤0.3	Rest	≤0.25	0.7-1.1	≤0.05	≤0.03	0.15-0.25	≤0.2
GOST 4543-71	0.35-0.42	≤0.025	≤0.025	0.3-0.6	1.35-1.65	0.2-0.45	≤0.3	Rest	≤0.3	0.7-1.1	≤0.05	≤0.03	0.15-0.25	≤0.2

Fe is the basis.
GOST 4543-71 regulates the content of high-quality steel: P≤0,025%; S≤0.015%; Сu≤0.25%.
According to TU 14-1-2765-79, the chemical composition is given for steel grade 38Х2МЮА-Ш.
According to TU 14-1-950-86, the chemical composition is given for steel grade 38X2MUA.
According to TU 14-1-3238-81 for steel grade 38Х2МЮА-СШ (38ХМЮА-СШ) the content of S≤0,015%.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa	HRC
Pipe seamless cold drawn, cold rolled and toplocatie, heat-treated in the delivery condition according to GOST 21729-76
	-	-	≥392	≥20	-	-	-	-
Rolled steel. Quenching in oil or water with 930-950 °C + Vacation at 640-680 °C, air cooling
100-200	-	≥590	≥780	≥10	≥45	≥590	-	-
Rolled steel. Quenching in oil from 900 °C + Vacation
-	300	≥1660	≥1810	≥8	≥43	≥390	≥550	-
A sample with diameter 10 mm, length 50 mm, laminated and annealed. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
-	-	≥98	≥110	≥66	≥95	-	-	-
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (indicated by temperature and duration of heat exposure)
-	-	≥640	≥800	≥20	≥60	-	-	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	-	-	-	-	285-341	25-37
Blank pieces of pipe fittings according to ST CKBA 026-2005. Quenching in oil with 935-965 °C (exposure for 2.5-4.0 hours depending on thickness and weight of the workpiece) + Holiday cooling in water or oil
≤160	620-650	590	≥735	≥13	≥40	≥490	235-277	-
Rolled steel. Quenching in oil or water with 930-950 °C + Vacation at 640-680 °C, air cooling
20-60	-	≥880	≥1030	≥18	≥52	-	250-300	-
Rolled steel. Quenching in oil from 900 °C + Vacation
-	400	≥1520	≥1670	≥10	≥39	≥100	≥500	-
A sample with diameter 10 mm, length 50 mm, laminated and annealed. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
-	-	≥66	≥84	≥57	≥97	-	-	-
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (indicated by temperature and duration of heat exposure)
-	-	≥550	≥710	≥23	≥63	-	-	-
Blank pieces of pipe fittings according to ST CKBA 026-2005. Quenching in oil with 935-965 °C (exposure for 2.5-4.0 hours depending on thickness and weight of the workpiece) + Holiday cooling in water or oil
≤40	620-650	835-880	≥1078	≥10	≥35	≥700	-	32.8-38.7
Rolled steel. Quenching in oil or water with 930-950 °C + Vacation at 640-680 °C, air cooling
60-100	-	≥730	≥880	≥10	≥45	≥590	-	-
Rolled steel. Quenching in oil from 900 °C + Vacation
-	500	≥1270	≥1420	≥10	≥44	≥290	≥450	-
A sample with diameter 10 mm, length 50 mm, laminated and annealed. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
-	-	≥39	≥49	≥66	≥98	-	-	-
Ring forged in OST 1 92049-76. Quenching in warm water or oil with 930-950 °C + Vacation at 600-670 °C, cooling in oil or water
30	-	≥795	≥930	≥13	≥42	≥755	-	-
Rolled steel. Quenching in oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
≤30	-	≥780	≥910	≥17	≥52	≥1150	-	-
Rolled steel. Quenching in oil from 900 °C + Vacation
-	600	≥1080	≥1180	≥12	≥60	≥780	≥370	-
A sample with diameter 10 mm, length 50 mm, laminated and annealed. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
-	-	≥22	≥32	≥77	≥100	-	-	-
Forgings. Quenching in oil with 935-965 °C + Vacation at 660-680 °C
100-300	-	≥590	≥735	≥13	≥40	≥490	235-277	-
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
140-180	-	≥780	≥930	≥14	≥48	≥390	-	-
A sample with diameter 10 mm, length 50 mm, laminated and annealed. The rate of deformation of 20 mm/min strain Rate 0,007 1/C
-	-	≥15	≥22	≥77	≥100	-	-	-
Bars hot rolled, forged and calibrated. Quenching in oil from 930-950 °C + Vacation at 600-670 °C, cooling in oil or water
	-	≥785	≥930	≥10	≥40	≥880	285-321	-
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
180-220	-	≥800	≥930	≥16	≥43	≥340	-	-
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (maintained for 5 h) HB≥255
-	-	≥650	≥800	≥17	≥64	-	-	-
Bars hot rolled, forged and calibrated. Quenching in oil from 930-950 °C + Vacation at 600-670 °C, cooling in oil or water
	-	≥785	≥930	≥15	≥50	≥1080	285-321	-
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
140-180	-	≥710	≥860	≥15	≥47	≥360	-	-
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (maintained for 5 h) HB≥255
-	-	≥580	≥780	≥17	≥56	-	-	-
Bars hot rolled, forged and calibrated. Quenching in warm water (30-60 °C) from 930-950 °C + Vacation at 600-670 °C, cooling in oil or water
	-	≥830	≥980	≥10	≥40	≥880	302-341	-
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
180-220	-	≥730	≥880	≥15	≥43	≥350	-	-
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (maintained for 5 h) HB≥255
-	-	≥570	≥810	≥18	≥58	-	-	-
Bars hot rolled, forged and calibrated. Quenching in warm water (30-60 °C) from 930-950 °C + Vacation at 600-670 °C, cooling in oil or water
	-	≥830	≥980	≥15	≥50	≥1080	302-341	-
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
30-50	-	≥830	≥950	≥16	≥50	≥1020	-	-
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (maintained for 5 h) HB≥255
-	-	≥550	≥720	≥20	≥63	-	-	-
Bars and strip hot rolled and forged. Quenching in oil or warm water with 930-950 °C + Vacation at 600-670 °C, cooling in water or oil
	-	≥835	≥980	≥15	≥50	≥883	302-341	-
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
50-80	-	≥830	≥940	≥15	≥50	≥480	-	-
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (maintained for 5 h) HB≥255
-	-	≥420	≥470	≥25	≥81	-	-	-
Bars and strip hot rolled and forged. Quenching in oil or warm water with 930-950 °C + Vacation at 600-670 °C, cooling in oil
30	-	≥785	≥932	≥15	≥50	≥980	285-321	-
Rolled steel. Hardening through water in the oil from 940 °C to + Vacation at 600 °C (named place of clippings sample)
80-140	-	≥780	≥920	≥15	≥48	≥410	-	-
Rolled steel. Quenching in oil with 930-940 °C + Vacation at 660 °C (maintained for 5 h) HB≥255
-	-	≥270	≥300	≥26	≥89	-	-	-
Bars and rods of steel treated in the ladle a synthetic slag in the delivery condition on the other 14-1-658-73. Samples of the cross
	-	-	-	≥9	≥33	≥490	302-341	-
	-	-	-	≥9	≥33	≥588	285-320	-
Rolled steel. Quenching in oil from 930 - 940 °C + Vacation at 660 °C (extract 5 h), air cooling
40-80	-	≥665	≥825	≥16.5	≥64	-	-	-
Rolled steel. Quenching in oil from 950 °C to + Vacation at 550 °C, cooling in oil
80-120	-	780-880	930-1030	12-15	35-45	690-980	285-302	-
Seamless tubes for mechanical treatment according to GOST 23270-89 heat-treated. Quenching in oil or water with 925-955 °C + Vacation at 600-680 °C, cooling in oil or water
	-	-	≥980	≥14	≥50	≥882	269-321	-

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
HRC	Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature	Е, HPa	G, HPa	r, kg/m³	l, W/(m · °C)	a, 10^-6 1/°C	С, J/(kg · °C)
0	209	82	-	33	-	-
20	209	-	7710	33	-	-
100	202	79	-	33	115	496
200	194	76	-	32	118	517
300	190	75	-	31	127	533
400	181	71	-	20	134	546
500	174	67	-	20	139	575
600	162	62	-	28	147	609
700	147	57	-	27	149	638
800	137	53	-	27	149	638
1000	-	-	-	-	123	676

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

Technological properties

Name	The value
Weldability	Does not apply to welded structures.
Склонность к отпускной хрупкости	Tend not.
The temperature of forging	Start - 1240 °C, the end - of 800 °C. the cross Sections up to 50 mm are cooled in stacks in the air, 51-100 mm - in boxes.
Flock-sensitive sensitivity	Sensitive.
Machinability	In the hardened and tempered condition when NV 240-277 blower SB=780 MPa Kn TV.SPL.=A 0.75 Kn b.St.=0,55.