38KHS steel is used: for the manufacture of shafts, gears, clutches, fingers and improve other parts of small dimensions, which are requirements of high strength, elasticity, and durability; solid-rolled rings for different purposes.

Note

Structural steel high-quality chromium-silicon.

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, OST 1 92049-76, TU 14-1-1611-76, TU 14-1-2118-77, TU 14-1-908-74, 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 1133-71, GOST 5267.0-90, 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
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-4944-90
Steel pipes and fittings to them	В62	TU 14-3-642-77

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
GOST 4543-71	0.34-0.42	≤0.035	≤0.035	0.3-0.6	1.3-1.6	1-1.4	≤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%.

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	-	≥540	≥685	≥15	≥45	≥579	223-262
≤100	-	≥590	≥735	≥14	≥45	≥579	235-277
Quenching in water or oil from 900 °C + Vacation at 630 °C, cooling in water or oil
≤100	-	≥540	≥685	≥15	≥45	≥590	-
Rolled steel. Quenching in water or oil from 900 °C + Vacation at 600 °C, cooling in water (named place of clippings sample)
80-120	-	≥720	≥950	≥17	≥60	≥746	-
A rod with a diameter of 20-70 mm. Quenching in oil from 900 °C to + Leave (exposure 2 hours), air cooling
-	200	≥1670	≥1960	≥10	≥40	≥590	-
Steel calibrated and calibrated with special surface finish, hot rolled and hot rolled with special surface finish
-	-	-	-	-	-	-	≤255
Quenching in water or oil from 900 °C + Vacation at 630 °C, cooling in water or oil
25	-	≥735	≥930	≥12	≥50	≥690	-
Rolled steel. Quenching in water or oil from 900 °C + Vacation at 600 °C, cooling in water (named place of clippings sample)
30-50	-	≥870	≥1030	≥18	≥58	≥1383	-
A rod with a diameter of 20-70 mm. Quenching in oil from 900 °C to + Leave (exposure 2 hours), air cooling
-	300	≥1580	≥1760	≥10	≥42	≥490	-
Ring forged in OST 1 92049-76. Quenching in oil with 885-915 °C + Vacation at 600-660 °C, cooling in oil
25	-	≥695	≥880	≥9	≥40	≥510	-
Rolled steel. Quenching in water or oil from 900 °C + Vacation at 600 °C, cooling in water (named place of clippings sample)
50-80	-	≥790	≥980	≥16	≥56	≥1040	-
A rod with a diameter of 20-70 mm. Quenching in oil from 900 °C to + Leave (exposure 2 hours), air cooling
-	400	≥1370	≥1570	≥10	≥45	≥590	-
Rolled steel. Quenching in water or oil from 900 °C + Vacation at 600 °C, cooling in water (named place of clippings sample)
80-120	-	≥620	≥890	≥20	≥58	≥618	-
A rod with a diameter of 20-70 mm. Quenching in oil from 900 °C to + Leave (exposure 2 hours), air cooling
-	500	≥1080	≥1270	≥12	≥50	≥690	-
Rolled steel. Quenching in oil from 900 °C + Vacation at 600 °C, cooling in water (named place of clippings sample)
80-120	-	≥680	≥910	≥16	≥57	≥657	-
A rod with a diameter of 20-70 mm. Quenching in oil from 900 °C to + Leave (exposure 2 hours), air cooling
-	600	≥880	≥980	≥18	≥55	≥780	-
Rolled steel. Quenching in oil from 900 °C + Vacation at 600 °C, cooling in water (named place of clippings sample)
≤30	-	≥770	≥960	≥15	≥59	≥942	-
30-50	-	≥810	≥1000	≥16	≥56	≥824	-
50-80	-	≥720	≥920	≥17	≥53	≥647	-
80-120	-	≥500	≥840	≥22	≥60	≥765	-

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	G, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
20	211	84	7640	38	284	-	-
100	203	80	-	38	329	123	466
200	194	78	-	37	413	131	508
300	184	72	-	35	563	136	529
400	174	68	-	34	725	138	563
500	166	65	-	33	902	142	592
600	157	62	-	31	1060	145	621
700	139	55	-	29	1280	147	634
800	127	48	-	28	-	147	634
1000	-	-	-	-	-	125	663

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	Difficult weldability. Welding methods: RDS - necessary heating and subsequent heat treatment. CCC - a necessary subsequent heat treatment.
Склонность к отпускной хрупкости	Inclined.
The temperature of forging	Beginning - 1220 °C, the end - of 800 °C. the cross Sections up to 250 mm are cooled in air, 251-350 mm - in the pit.
Flock-sensitive sensitivity	not sensitive.
Machinability	At 250 to 300 HB[100] blower SB=780-880 MPa Kn TV.SPL.=0.8 Kn b.St.=0,72.

Steel 38KHS

Designation

Description