Steel 15KHM

Designation

Name	The value
Designation GOST Cyrillic	15ХМ
Designation GOST Latin	15XM
Transliteration	15HM
By chemical elements	15CrMo

Description

Steel 15KHM used: for the manufacture of bushings for tracks of tractors; various parts operating at temperatures from -40 °C to +560 °C under pressure; pipelines with quenching in water or air and release air; a tube blank intended for the production of seamless cold, warm, hot-wrought, including hot-pressed and hot-pressed reduced pipes for steam boilers and pipelines, installations with high and supercritical steam parameters.

Note

The structural quality chromium vanadium steel.

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 10702-78, GOST 14955-77, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-1529-2003, TU 14-1-5228-93, TU 14-136-367-2008
Bars and shapes	В22	GOST 1133-71, GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006
Processing of metals by pressure. Forgings	В03	GOST 8479-70, OST 5Р.9125-84, TU 0306.018-80, ST ЦКБА 010-2004
Steel pipes and fittings to them	В62	GOST 8732-78, GOST 8734-75, GOST 9567-75, GOST 23270-89, GOST 24950-81, GOST 30563-98, GOST 30564-98, GOST 8733-87, GOST 8731-87, GOST Р 53383-2009, TU 14-159-195-90, TU 14-3-463-2005, TU 14-3-460-2009, TU 14-3Р-55-2001, TU 14-3-460-2003, TU 14-3-1654-89
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 108-938-80, TU 14-1-4944-90, TU 14-1-4992-91
Thermal and thermochemical treatment of metals	В04	ST ЦКБА 026-2005

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
TU 14-3-460-2003	0.11-0.15	≤0.025	≤0.035	0.4-0.7	0.8-1.1	0.17-0.37	≤0.25	Rest	≤0.2	-	-	0.4-0.55	-
GOST 4543-71	0.11-0.18	≤0.035	≤0.035	0.4-0.7	0.8-1.1	0.17-0.37	≤0.3	Rest	≤0.3	≤0.05	≤0.03	0.4-0.55	≤0.2
TU 14-3Р-55-2001	0.1-0.15	≤0.025	≤0.035	0.4-0.7	0.8-1.1	0.17-0.37	≤0.25	Rest	≤0.2	-	-	0.4-0.55	-

Fe is the basis.
According to GOST 4543-71 the content in high-quality steel is regulated: P ≤ 0.025%; S ≤ 0.025%; Cu ≤ 0.30%; in high-grade steel: P ≤ 0.025%; S ≤ 0.015%; Cu ≤ 0.25%.
According to TU 14-1-1529-2003 and TU 14-3-460-2003 for steel produced by scrap process or from cuprous ores, the mass fraction of residual copper and nickel is allowed up to 0.30% of each. A technological addition of rare earth elements is allowed to improve the quality of the metal. Deviation by the mass fraction of carbon is allowed - minus 0.020%.
According to TU 14-3P-55-2001 for steel made by scrap-process or from cuprous ores, the content of copper and nickel is allowed to not exceed 0.30% of each. The presence of rare-earth elements introduced as technological additives is allowed.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa
Forgings. Hardening + Vacation
100-300	-	≥345	≥590	≥17	≥40	≥530	174-217
100	-	≥395	≥615	≥17	≥45	≥579	187-229
100	-	≥440	≥635	≥16	≥45	≥579	197-235
100	-	≥490	≥655	≥16	≥45	≥579	212-248
Blank pieces of pipe fittings. Quenching in water from 910-930 °C (exposure for 2.5-4.0 hours depending on thickness and weight of the workpiece) with the following tempering in the air
≤100	560-580	≥490	≥615	≥18	≥50	≥686	197-217
Steel calibrated and calibrated with special surface finish, hot rolled and hot rolled with special surface finish. Heat-treated (annealing)
	-	-	-	-	-	-	≤179
Seamless pipes for steam boilers and pipelines according to TU 14-3P-55-2001. Normalization at 930-960 °C + Vacation at 680-730 (excerpt of not less than 0.5 h), air cooling
	-	≥225	-	-	-	-	-
Rolled steel. Normalization at 900-920 °C, air cooling + Vacation at 630-650 °C
-	-	≥345	≥530	≥26	≥67	-	-
Blank pieces of pipe fittings. Annealing in air from 930-950 °C (exposure for 2.5-4.0 hours depending on thickness and weight of the workpiece) with the following tempering in the air
≤300	620-640	≥255	≥441	≥22	≥40	≥590	143-163
Seamless pipes for steam boilers and pipelines according to TU 14-3P-55-2001. Normalization at 930-960 °C + Vacation at 680-730 (excerpt of not less than 0.5 h), air cooling
	-	≥196	-	-	-	-	-
Rolled steel. Normalization at 900-920 °C, air cooling + Vacation at 630-650 °C
-	-	≥220	≥500	≥22	≥67	-	-
Forgings for parts resistant to the ICC. Annealing in air from 870-890 °C + Vacation at 640-660 °C, air cooling
≤250	-	≥275	≥441	≥21	≥55	≥1177	-
Seamless pipes for steam boilers and pipelines according to TU 14-3P-55-2001. Normalization at 930-960 °C + Vacation at 680-730 (excerpt of not less than 0.5 h), air cooling
	-	≥191	-	-	-	-	-
Rolled steel. Normalization at 900-920 °C, air cooling + Vacation at 630-650 °C
-	-	≥245	≥495	≥24	≥69	-	-
Tubular billet + hot deformed Tubes (DH=57-465 mm) TU 14-3-460-2003. Normalization at 900-930 °C + Vacation at 700-730 °C (aged for at least 30 min), air cooling
20-25	-	≥225	440-460	≥20	≥45	≥490	-
Rolled steel. Normalization at 900-920 °C, air cooling + Vacation at 630-650 °C
-	-	≥245	≥480	≥22	≥74	-	-
Tubular billet + hot deformed Tubes (DH=57-465 mm) TU 14-3-460-2003. Normalization at 900-930 °C + Vacation at 700-730 °C (aged for at least 30 min), air cooling
20-25	-	≥235	440-640	≥21	≥50	≥590	-
Forgings. Normalization + Vacation
100-300	-	≥195	≥390	≥23	≥50	≥530	111-156
Rolled steel. Normalization at 900-920 °C, air cooling + Vacation at 630-650 °C
-	-	≥265	≥440	≥20	≥76	-	-
Forgings. Normalization + Vacation
100	-	≥195	≥390	≥26	≥55	≥579	111-156
Seamless pipes for steam boilers and pipelines according to TU 14-3P-55-2001. Normalization at 930-960 °C + Vacation at 680-730 (excerpt of not less than 0.5 h), air cooling
-	-	≥225	441-637	≥20	≥45	≥490	-
Rolled steel. Normalization at 900-920 °C, air cooling + Vacation at 630-650 °C
-	-	≥265	≥410	≥20	62-82	-	-
Forgings. Normalization + Vacation
100-300	-	≥215	≥430	≥20	≥48	≥481	123-167
Seamless pipes for steam boilers and pipelines according to TU 14-3P-55-2001. Normalization at 930-960 °C + Vacation at 680-730 (excerpt of not less than 0.5 h), air cooling
-	-	≥235	441-637	≥21	≥50	≥590	-
Rolled steel. Normalization at 900-920 °C, air cooling + Vacation at 630-650 °C
-	-	≥245	≥410	≥21	≥79	-	-
Tubes seamless cold - and hot-deformed in the delivery condition heat treated
	-	≥225	≥431	≥21	-	-	-
Forgings. Normalization + Vacation
100	-	≥215	≥430	≥24	≥53	≥530	123-167
Rolled steel. Normalization at 900-920 °C, air cooling + Vacation at 630-650 °C
-	-	≥240	≥305	≥22	51-77	-	-
Forgings. Normalization + Vacation
100-300	-	≥245	≥470	≥19	≥42	≥334	143-179
100	-	≥245	≥470	≥22	≥48	≥481	143-179
100-300	-	≥275	≥530	≥17	≥38	≥334	156-197
300-500	-	≥275	≥530	≥15	≥32	≥285	156-197
100	-	≥275	≥530	≥20	≥40	≥432	156-197
100	-	≥315	≥570	≥17	≥38	≥383	167-207
100	-	≥345	≥590	≥18	≥45	≥579	174-217

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)
0	205	7850	-	-	-
100	-	7830	44	122	-
200	-	7800	41	13	-
300	-	7760	41	133	487
400	-	7730	39	137	-
500	-	7700	36	14	-
600	-	7660	34	143	-
800	-	-	29	134	-
900	-	-	29	-	-
700	-	-	-	145	-
1000	-	-	-	112	-
1200	-	-	-	125	-

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	Welded without any restrictions. Welding methods: SMAW, ADS under gas protection, the CCC. Recommended heating and subsequent heat treatment.
Склонность к отпускной хрупкости	Tend not.
The temperature of forging	Start - 1260 °C, the end - 750 °C. the cross Sections up to 200 mm are cooled in air, 201-700 mm are subjected to low temperature annealing.
Flock-sensitive sensitivity	Sensitive.
Machinability	In the normalized and tempered condition, when blower SB 138 HB=460 MPa Kn TV.SPL.=1,6 Kn b.St.=1,4.