38KHA steel is used: for the manufacture of hot rolled plates; worms and worm pairs of parts, gears, pinions, shafts, axles, critical bolts, special fasteners and other upgradable parts, rolled rings for different purposes.

Note

Structural steel high quality chrome.

Standards

Name	Code	Standards
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 3-1053-86, TU 14-1-2118-77, TU 14-1-2765-79, TU 14-1-2995-80, TU 14-1-950-74, TU 14-1-3238-81, 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 8278-83, GOST 8281-80, GOST 8282-83, GOST 8283-93, GOST 8319.0-75, GOST 9234-74, GOST 11474-76, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Sheets and strips	В33	GOST 1577-93, TU 14-1-1409-75, TU 14-1-4118-86, TU 14-1-4118-2004
Steel pipes and fittings to them	В62	GOST 21729-76, TU 14-3-675-78, TU 14-3Р-50-2001
Sheets and strips	В23	GOST 82-70, GOST 19903-74, GOST 103-2006, GOST 19903-90
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 14-1-4992-91, TU 1-92-156-90
Steel cylinders	В66	TU 14-3-246-74
Processing of metals by pressure. Forgings	В03	TU 14-3-286-74

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
TU 14-1-2765-79	0.35-0.42	≤0.015	≤0.025	0.5-0.8	0.8-1.1	0.17-0.37	≤0.3	Rest	≤0.25	≤0.05	≤0.03	≤0.15	≤0.2
TU 14-1-950-74	0.35-0.42	≤0.025	≤0.025	0.5-0.8	0.8-1.1	0.17-0.37	≤0.3	Rest	≤0.25	≤0.05	≤0.03	≤0.15	≤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 38ХА-Ш.
According to TU 14-1-3238-81 for steel grade 38XA-C, 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
Hot-rolled steel and hot rolled with special surface finish
	-	-	-	-	-	-	≤187	-
Steel calibrated and calibrated with special surface finish
	-	-	-	-	-	-	≤207	-
	-	-	≤590	-	≥60	-	≤207	-
	-	-	≤560	-	≥60	-	≤207	-
Pipe seamless cold drawn, cold rolled and toplocatie, heat-treated in the delivery condition according to GOST 21729-76
	-	-	≥588	≥14	-	-	-	-
Forgings. Quenching in oil from 850 °C + vacation at 560 °C, air cooling
100	-	≥540	≥690	≥15	≥45	≥590	240-280	-
Rolled steel. Hardening in water from 850 °C + Vacation
-	400	≥1220	≥1310	≥7	≥38	-	≥380	-
A rod with a diameter of 25 mm. Quenching in oil from 860 °C to + Vacation at 550 °C
-	-	≥900	≥1040	≥18	≥58	-	-	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	880-1080	-	-	-	262-311	27-34
Forgings. Quenching in oil from 850 °C + vacation at 560 °C, air cooling
100-200	-	≥490	≥660	≥13	≥40	≥540	230-270	-
Rolled steel. Hardening in water from 850 °C + Vacation
-	500	≥930	≥1030	≥12	≥47	-	≥320	-
A rod with a diameter of 25 mm. Quenching in oil from 860 °C to + Vacation at 550 °C
-	-	≥930	≥1100	≥18	≥55	-	-	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	1080-1270	-	-	-	311-363	34-39
Ring forged in OST 1 92049-76. Quenching in oil with 845-875 °C + Vacation at 500-590 °C, cooling in water or oil
25	-	≥745	≥880	≥9	≥40	≥657	-	-
Forgings. Quenching in oil from 850 °C + vacation at 560 °C, air cooling
200-300	-	≥440	≥640	≥14	≥40	≥540	230-260	-
Rolled steel. Hardening in water from 850 °C + Vacation
-	600	≥710	≥830	≥17	≥63	-	≥260	-
A rod with a diameter of 25 mm. Quenching in oil from 860 °C to + Vacation at 550 °C
-	-	≥1000	≥1120	≥18	≥55	-	-	-
Bars hot rolled, forged and calibrated. Quenching in oil with 845-875 °C + Vacation, cooling in water or oil
	500-550	≥785	≥930	≥12	≥50	≥980	285-341	-
A rod with a diameter 28-55 mm Quenching in oil from 830 °C to + Vacation at 680 °C (extract 3 hours)
-	-	≥570	≥700	≥26	≥60	-	207-217	-
Bars hot rolled, forged and calibrated. Quenching in oil with 845-875 °C + Vacation, cooling in water or oil
	560-590	≥785	≥880	≥12	≥50	≥880	262-311	-
A rod with a diameter 28-55 mm Quenching in oil from 830 °C to + Vacation at 680 °C (extract 3 hours)
-	-	≥430	≥590	≥19	≥71	-	-	-
-	-	≥360	≥420	≥24	≥79	-	-	-
-	-	≥210	≥245	≥32	≥89	-	-	-
A rod with a diameter 28-55 mm Quenching in oil from 850 °C + Vacation at 550 °C (extract 3 hours)
-	-	≥790	≥940	≥13	≥55	-	285-302	-
-	-	≥680	≥880	≥17	≥58	-	-	-
-	-	≥610	≥690	≥18	≥68	-	-	-
-	-	≥430	≥490	≥21	≥80	-	-	-

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)	R, Mr. · m	a, 10^-6 1/°C
0	196	83	7850	-	290	-
20	196	-	7850	-	290	-
200	-	-	7800	46	-	131
600	-	-	7650	35	-	142
100	-	-	-	50	-	127
300	-	-	-	42	-	135
400	-	-	-	40	-	138
500	-	-	-	37	-	142
700	-	-	-	31	-	-
800	-	-	-	-	-	146

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, it is recommended that fusion welding with preheating and subsequent heat treatment.
Склонность к отпускной хрупкости	inclined
The temperature of forging	Start - 1240 °C, the end - 780 °C.
Flock-sensitive sensitivity	sensitive
Machinability	blower SB=930 MPa Kn TV.SPL.=0.7 Kn b.St.=0.8

Steel 38KHA

Designation

Description