38KHGN steel is used: for the manufacture of parts of excavators, fasteners, shafts, axles, gears, earrings and other critical parts, which are requirements of high strength.

Note

Structural steel quality homomasculinity.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 103-2006
Bars and shapes	В32	GOST 1051-73, GOST 4543-71, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-2118-77, TU 14-11-245-88, 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
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

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
GOST 4543-71	0.35-0.43	≤0.035	≤0.035	0.8-1.1	0.5-0.8	0.17-0.37	0.7-1	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	HRC
Quenching in oil from 850 °C + vacation
-	200	1580	1780	15	36	275	499	-
-	300	1470	1670	16	40	186	478	-
-	400	1290	1370	16	41	461	415	-
-	500	1150	1200	16	46	765	350	-
-	600	950	1040	19	54	1540	269	-
Quenching in oil from 850 °C + vacation at 570 °C, cooling in water or oil
≤25	-	685	780	12	45	961	-	-
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
250	-	660	810	16	51	628	255	-
Quenching + tempering (forgings)
300-500	-	315	570	12	30	-	167-207	-
A specimen of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain rate of 0.002 1/s.
-	-	185	200	34	93	-	-	-
Quenching in oil with 850-870 °C + vacation at 180-200 °C, air cooling
25-40	-	1340	1470	7	30	-	-	50-53
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
350	-	660	800	16	50	530	255	-
Quenching + tempering (forgings)
300-500	-	345	590	14	38	-	174-217	-
A specimen of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain rate of 0.002 1/s.
-	-	89	135	57	98	-	-	-
Quenching in oil with 850-870 °C + vacation at 650 °C, air cooling
50-100	-	690	880	-	60	-	241	-
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
450	-	690	840	15	47	481	248	-
Quenching + tempering (forgings)
500-800	-	345	590	12	33	-	174-217	-
A specimen of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain rate of 0.002 1/s.
-	-	52	76	68	100	-	-	-
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
250	-	700	850	15	54	677	269	-
Quenching + tempering (forgings)
100-300	-	395	615	15	40	-	187-229	-
A specimen of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain rate of 0.002 1/s.
-	-	27	50	75	100	-	-	-
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
350	-	730	840	17	59	814	262	-
Quenching + tempering (forgings)
300-500	-	395	615	13	35	-	187-229	-
A specimen of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain rate of 0.002 1/s.
-	-	18	35	66	100	-	-	-
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
450	-	730	890	15	54	716	262	-
Quenching + tempering (forgings)
500-800	-	395	615	11	30	-	187-229	-
A specimen of 10 mm diameter, 50 mm length, forged and annealed. The rate of deformation of 5 mm/min strain rate of 0.002 1/s.
-	-	10	20	66	100	-	-	-
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
250	-	700	860	17	48	579	241	-
Quenching + tempering (forgings)
≤100	-	440	635	16	45	-	197-235	-
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
350	-	690	870	14	43	481	248	-
Quenching + tempering (forgings)
300-500	-	440	635	13	35	-	197-235	-
Quenching in water or oil from 850 °C + vacation at 560 °C, cooling in water or oil (named place of clippings sample)
450	-	590	810	15	32	343	235	-
Quenching + tempering (forgings)
≤100	-	490	655	16	45	-	212-248	-
Quenching using water in oil from 850 °C + vacation at 560 °C (10 h exposure), cooling in water (named place of clippings sample)
550	-	660	870	14	52	530	275	-
Quenching + tempering (forgings)
100-300	-	490	655	13	40	-	212-248	-
Quenching using water in oil from 850 °C + vacation at 560 °C (10 h exposure), cooling in water (named place of clippings sample)
550	-	800	930	16	52	677	275	-
Quenching + tempering (forgings)
≤100	-	540	685	15	45	-	223-262	-
Quenching using water in oil from 850 °C + vacation at 560 °C (10 h exposure), cooling in water (named place of clippings sample)
550	-	490	730	15	30	589	229	-
Quenching + tempering (forgings)
100-300	-	540	685	13	40	-	223-262	-
≤100	-	590	735	14	45	-	235-277	-
Normalization (forgings)
500-800	-	315	570	11	30	-	167-207	-
≤100	-	345	590	18	45	-	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
HRC	Rockwell hardness (indenter diamond spheroconical)

Technological properties

Name	The value
Weldability	difficult weldability. Method of welding: SMAW. Necessary preheating and subsequent heat treatment.
Склонность к отпускной хрупкости	inclined
The temperature of forging	Start - 1200 °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	sensitive

Steel 38KHGN

Designation

Description