Alloy structural steel high quality with low carbon content.
Steel 12KH2NVFMA strengthen by heat treatment (quenching in oil with subsequent tempering or normalizing with tempering). Case hardening steel.

Standards

Name	Code	Standards
Sheets and strips	В33	GOST 11268-76, GOST 11269-76, TU 14-1-1122-74
Sheets and strips	В23	GOST 82-70
Classification, nomenclature and General rules	В20	OST 1 90005-91
Blanks. Of the workpiece. Slabs	В31	TU 1-92-156-90
Bars and shapes	В32	TU 14-1-1885-85, TU 14-1-950-74

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
GOST 11268-76	0.09-0.16	≤0.025	≤0.025	0.6-0.9	1.9-2.4	0.17-0.37	1.2-1.6	Rest	≤0.25	0.18-0.28	≤0.03	0.35-0.45	1-1.4

Fe is the basis.
According to TU 14-1-1885-85, the chemical composition is given for steel grade 12Х2НВФМА-ВД (ЭИ712М-ВД). At the request of the consumer, bars larger than 30 mm are supplied with a molybdenum content of 0.50-0.70%. In this case the steel is marked EI712A. The presence of titanium up to 0.030% is not a rejection sign. The allowable variation in manganese content in steel is ± 0.010%.

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
Steel hot-rolled sheet (4-60 mm) 4-th and 5-th categories. Quenching in oil or air from 910±15 °C, leave at 500-550 °C, air cooling
	-	-	≥980	≥11	-	-	≥590	-	-
Bars and strip hot rolled and forged. Quenching in oil with 895-925 °C + Vacation, air cooling
	500-550	≥885	≥980	≥12	-	≥55	≥785	269-341	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	980-1180	-	-	-	-	285-341	30-37
Flats on the other 14-1-4118-2004
≤3.9	-	-	490-736	≥15	≥11	-	-	-	-
Bars and strip hot rolled and forged. Quenching in oil with 895-925 °C + Vacation, air cooling
	200-300	≥930	≥1080	≥10	-	≥50	≥687	302-388	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	-	-	-	-	-	285-415	30-43.5
Rods made of steel 12KH2NVFMA (ЭИ712М) TU 14-1-1885-85. Quenching in oil with 895-925 °C + Vacation, air cooling. In the graph KCU KCU values are shown along the fiber/KCU across the grain
Образец 15х15	480-510	≥885	≥980	≥12	-	≥55	≥784/-	285-374	-
Образец 15х15	200-300	≥930	≥1080	≥10	-	≥50	≥686/-	302-387	-

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)

Technological properties

Name	The value
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 12KH2NVFMA (ЭП506; ЭИ712М)

Designation

Description

Note

Standards

Chemical composition

Mechanical properties

Description mechanical marks

Technological properties

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