15X steel is used: for the manufacture of bushings, fingers, gears, rollers, pushers and other case hardening of parts, which required high surface hardness with a low strength of the core; parts operating in conditions of wear by friction; seamless tubes for the manufacture of parts and structures in motovelotehnika.

Note

Steel structural quality chrome.

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 14-1-5414-2001, TU 3-1059-86, TU 14-1-2118-77, TU 14-11-245-88, TU 14-1-1271-75, TU 14-1-5228-93, TU 14-136-367-2008
Bars and shapes	В22	GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Processing of metals by pressure. Forgings	В03	GOST 8479-70, ST ЦКБА 010-2004
Steel pipes and fittings to them	В62	GOST 8734-75, GOST 9567-75, GOST 12132-66, GOST 23270-89, GOST 24950-81, GOST 8733-87
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-4944-90

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
GOST 4543-71	0.12-0.18	≤0.035	≤0.035	0.4-0.7	0.7-1	0.17-0.37	≤0.3	Rest	≤0.3	≤0.05	≤0.03	≤0.15	≤0.2
GOST 10702-78	0.12-0.18	≤0.035	≤0.035	≤0.6	0.7-1	≤0.2	≤0.3	Rest	≤0.3	≤0.05	≤0.03	≤0.15	≤0.2

Fe is the basis.
According to GOST 4543-71 the content in high-quality steel is regulated: P≤0,025%; S≤0.025%; Сu≤0.30%;
in high-grade steel: P≤0,025%; S≤0.015%; Сu≤0.25%. In accordance with the order, the content of Si = 0.10-0.37% can be established.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d₁₀	y, %	KCU, kJ/m²	HB, MPa	HRC
Hot-rolled steel and hot rolled with special surface finish
-	-	-	-	-	-	-	-	≤156	-
Steel calibrated and calibrated with special surface finish
-	-	-	≥590	≥5	-	≥45	-	≤207	-
-	-	-	≤550	-	-	≥60	-	≤179	-
-	-	-	340-440	-	-	≥60	-	≤179	-
Forgings. Hardening + Vacation
100	-	≥345	≥590	≥18	-	≥45	≥579	174-217	-
Forgings. Normalization
100-300	-	≥195	≥390	≥23	-	≥50	≥530	111-156	-
100	-	≥195	≥390	≥26	-	≥55	≥579	111-156	-
Long products (wire). Quenching in water from 880 °C + Quenching in water 770-820 °C + Vacation at 180 °C, air cooling
15	-	≥490	≥690	≥12	-	≥45	≥690	-	-
Rolled steel. Quenching in water from 880 °C to + Leave (longitudinal samples)
-	200	≥550	≥780	≥7	-	≥46	≥383	-	-
Sample diameter 10 mm, length 100 mm, annealed. The speed of the grippers of the machine of 0.38-0,47 mm/min.
-	-	-	≥48	-	≥36	≥56	-	-	-
Long products (wire). Carburizing at 910 °C + Quenching in water from 790 °C to + Vacation at 190 °C
15	-	≥370	≥610	≥15	-	≥45	≥579	≥179	58-64
Rolled steel. Quenching in water from 880 °C to + Leave (longitudinal samples)
-	300	≥560	≥750	≥4	-	≥55	≥481	-	-
Sample diameter 10 mm, length 100 mm, annealed. The speed of the grippers of the machine of 0.38-0,47 mm/min.
-	-	-	≥47	-	≥19	≥25	-	-	-
Seamless cold-worked tubes in the delivery condition heat-treated (NV - wall > 10 mm)
	-	-	≥412	≥19	-	-	-	≤179	-
Rolled steel. Quenching in water from 880 °C to + Leave (longitudinal samples)
-	400	≥560	≥720	≥6	-	≥59	≥765	-	-
Sample diameter 10 mm, length 100 mm, annealed. The speed of the grippers of the machine of 0.38-0,47 mm/min.
-	-	-	≥32	-	≥29	≥52	-	-	-
Rolled steel. Quenching in water from 880 °C to + Leave (longitudinal samples)
-	500	≥540	≥680	≥9	-	≥61	≥961	-	-
Sample diameter 10 mm, length 100 mm, annealed. The speed of the grippers of the machine of 0.38-0,47 mm/min.
-	-	-	≥32	-	≥42	≥96	-	-	-
Rolled steel. Quenching in water from 880 °C to + Leave (longitudinal samples)
-	600	≥530	≥630	≥10	-	≥61	≥1246	-	-
Sample diameter 10 mm, length 100 mm, annealed. The speed of the grippers of the machine of 0.38-0,47 mm/min.
-	-	-	≥19	-	≥52	≥98	-	-	-

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
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	r, kg/m³	l, W/(m · °C)	a, 10^-6 1/°C	С, J/(kg · °C)
20	215	-	7830	44	-	-
100	212	82	7810	44	102	496
500	170	67	-	36	135	567
600	162	63	7640	33	135	588

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 restriction (except chemical-thermally treated parts). Welding methods: SMAW, CCC.
Склонность к отпускной хрупкости	Tend not.
The temperature of forging	Start - 1260 °C, end - 800 °C. of the Workpiece cross-section up to 200 mm are cooled in air, 200-700 mm are subjected to low temperature annealing.
Flock-sensitive sensitivity	not sensitive.

Steel 15KH

Designation

Description