25KHGSA steel is used: for the manufacture of hot rolled plates; responsible welded and stamped parts used in the improved condition (chassis screws, axles, shafts, worms, cranks, crankshafts, rods and other parts).

Note

Structural steel high-quality chromonemata.

Standards

Name	Code	Standards
Bars and shapes	В32	GOST 1051-73, GOST 4543-71, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-1-1885-85, TU 14-1-2118-77, TU 14-1-950-74, TU 14-1-3238-81, TU 14-11-245-88, TU 14-1-3238-2006, TU 14-1-1271-75, TU 14-1-5228-93, TU 14-136-367-2008
Sheets and strips	В33	GOST 11268-76, GOST 11269-76, TU 14-1-1307-75, TU 14-1-1409-75, TU 14-1-1598-75, TU 14-1-4118-86, TU 14-1-4118-2004
Sheets and strips	В23	GOST 82-70, GOST 103-2006
Bars and shapes	В22	GOST 8319.0-75, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Classification, nomenclature and General rules	В20	OST 1 90005-91
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, TU 14-1-4944-90, TU 1-92-156-90

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
TU 14-1-1885-85	0.22-0.28	≤0.015	≤0.025	0.8-1.1	0.8-1.1	0.9-1.2	≤0.3	Rest	≤0.25	-	-	-	-
TU 14-1-4118-2004	0.22-0.28	≤0.025	≤0.025	0.8-1.1	0.8-1.1	0.9-1.2	≤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%.
According to TU 14-1-3238-81 for steel grade 25ХГСА-СШ the content S≤0,015%.
According to TU 14-1-1885-85 the chemical composition is given for steel grade 25ХГСА-ВД. To ensure the required grain size, it is allowed to introduce vanadium in the steel smelting at the rate of its content in steel no more than 0.10%, the content of which in steel is not determined. The presence of tungsten to 0.20%, molybdenum to 0.15%, titanium to 0.030% is not a defect. The allowable variation in manganese content in steel is + 0.010 / -0.020%.

Mechanical properties

Section, mm	t отпуска, °C	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d₄	d₁₀	y, %	KCU, kJ/m²	HB, MPa	HRC
Rolled steel. Quenching in oil from 890 °C to + Vacation at 600 °C, cooling in water (named place of clippings sample)
80-200	-	≥450	≥700	≥28	-	-	≥67	-	-	-
Rod cross-section 20-70 mm. Quenching in oil from 890 °C to + vacation
-	300	≥1320	≥1510	≥12	-	-	≥57	≥690	-	≥44
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	880-1080	-	-	-	-	-	262-311	27-34
Rolled steel. Quenching in oil from 890 °C to + Vacation at 600 °C, cooling in water (named place of clippings sample)
15-30	-	≥520	≥690	≥25	-	-	≥67	-	-	-
Rod cross-section 20-70 mm. Quenching in oil from 890 °C to + vacation
-	400	≥1200	≥1270	≥12	-	-	≥59	≥690	-	≥42
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	980-1180	-	-	-	-	-	285-341	30-37
Steel hot-rolled sheet (4-60 mm) 4-th and 5-th categories. Quenching in oil at 880±15 °C + Vacation at 470-550 °C, cooling in water or oil
	-	-	≥1030	≥10	-	-	-	≥490	-	-
Rolled steel. Quenching in oil from 890 °C to + Vacation at 600 °C, cooling in water (named place of clippings sample)
30-80	-	≥400	≥630	≥24	-	-	≥67	-	-	-
Rod cross-section 20-70 mm. Quenching in oil from 890 °C to + vacation
-	500	≥980	≥1030	≥17	-	-	≥60	≥1270	-	≥35
A sheet of thin (≤3.9 mm) hot - and cold-rolled. Quenching in oil at 880 °C + Vacation at 500-570 °C, cooling in water or oil
	-	-	≥1080	≥10	-	-	-	-	-	-
Rolled steel. Quenching in oil from 890 °C to + Vacation at 600 °C, cooling in water (named place of clippings sample)
80-200	-	≥390	≥610	≥30	-	-	≥67	-	-	-
Rod cross-section 20-70 mm. Quenching in oil from 890 °C to + vacation
-	600	≥730	≥830	≥20	-	-	≥67	≥1960	-	≥25
Flats on the other 14-1-4118-2004
	-	-	490-687	-	≥21	≥17	-	-	-	-
Rolled steel. Hardening through water in the oil from 890 °C to + vacation at 600 °C, okhlazhdeniem water (named place of clippings sample)
120-160	-	≥520	≥710	≥24	-	-	≥67	-	-	-
Bars and strip hot rolled and forged. Quenching in oil with 880-900 °C + Vacation at 470-500 °C, cooling in water or oil
	-	≥835	≥1080	≥10	-	-	≥45	≥590	311-363	-
Rolled steel. Hardening through water in the oil from 890 °C to + vacation at 600 °C, okhlazhdeniem water (named place of clippings sample)
160-200	-	≥510	≥710	≥25	-	-	≥63	-	-	-
Rods made of steel 25KHGSA on the other 14-1-1885-85. Quenching in oil with 880-900 °C + Vacation at 470-500 °C, cooling in water or oil. In the graph KCU KCU values are shown along the fiber/KCU across the grain
Образец 15х15	-	≥835	≥1080	≥10	-	-	≥45	≥588/-	310-363	-
Rolled steel. Hardening through water in the oil from 890 °C to + vacation at 600 °C, okhlazhdeniem water (named place of clippings sample)
80-120	-	≥550	≥720	≥21	-	-	≥67	-	-	-
Rolled steel. Quenching in oil from 890 °C to + Vacation at 600 °C, cooling in water
15-30	-	≥520	≥690	≥25	-	-	≥67	≥1795	-	-
Rolled steel. Hardening through water in the oil from 890 °C to + vacation at 600 °C, okhlazhdeniem water (named place of clippings sample)
120-160	-	≥410	≥640	≥28	-	-	≥68	-	-	-
Rolled steel. Quenching in oil from 890 °C to + Vacation at 600 °C, cooling in water
30-80	-	≥400	≥630	≥24	-	-	≥67	≥1825	-	-
Rolled steel. Hardening through water in the oil from 890 °C to + vacation at 600 °C, okhlazhdeniem water (named place of clippings sample)
160-200	-	≥390	≥630	≥29	-	-	≥66	-	-	-
30-50	-	≥560	≥720	≥26	-	-	≥69	-	-	-
80-120	-	≥440	≥660	≥26	-	-	≥67	-	-	-

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
d₄	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)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
0	213	83	7850	35	306	-	-
20	213	-	7850	35	306	-	-
100	206	81	7830	36	338	122	496
200	194	76	7790	37	415	13	504
300	187	74	7760	37	501	136	512
400	175	68	7730	39	573	14	533
500	168	65	7690	34	660	142	554
600	163	63	7650	32	830	144	584
700	143	51	7610	31	1000	145	622
800	130	49	-	29	1100	145	622
1000	-	-	-	-	-	123	693

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
a	The coefficient of linear expansion

Technological properties

Name	The value
Weldability	welded without any restrictions
Склонность к отпускной хрупкости	inclined
The temperature of forging	Start - 1180 °C, the end - 850 °C.
Flock-sensitive sensitivity	sensitive
Machinability	After hardening, tempering blower SB=780-900 MPa Kn NV 228-262 TV.SPL.=0.8, Kn b.St.=0.72
Macrostructure and pollution	Macrostructure of steel when testing for the breaks in the longitudinal direction and transverse templeto selected from rolled, should not have shrinkage, porosity, bubbles, cracks, delamination, inclusions and placenow and defects of fracture, listed in Annex 3 GOST 10243. The Central porosity, point heterogeneity and phase separation in the square should not exceed 1 points; layer-by-layer crystallization and the bright loop - 3 points reference scales GOST 10243. All other defects under GOST 10243, are not allowed. Pollution steel non-metallic inclusions should be according to the average score is not higher (in points): oxides of point 1,5, 2,0 stroke oxides, silicates fragile 1,0, 1,0 silicates plastic, silicates, non-deformed 2,5, 2,5 sulfides, nitrides stroke and point 1,0.

Steel 25KHGSA

Designation

Description