07Х12НМБФ steel is used: for the manufacture of sheet and structural shapes, hot rolled and forged bars and forgings intended for subsequent cold machining or hot for subsequent machining (stamping, forging, rolling, etc.) in the manufacture of machine parts; solid-rolled rings for different purposes; welding wire.

Note

Steel corrosion-resistant martensitic class.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 82-70, GOST 19903-74, GOST 19904-90, GOST 19903-90
Classification, nomenclature and General rules	В20	OST 1 90005-91
Blanks. Of the workpiece. Slabs	В31	OST 1 90231-76, OST 1 90302-81, OST 1 90348-83, OST 1 90385-89, TU 14-1-1214-75
Bars and shapes	В32	OST 1 92049-76, TU 14-1-931-74
Processing of metals by pressure. Forgings	В03	TU 14-1-1530-75, TU 14-1-2918-80
Sheets and strips	В33	TU 14-1-2271-77, TU 14-1-2412-78
Welding and cutting metals. Soldering, riveting	В05	TU 14-1-2458-78

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	V	Mo	Nb	Ce
TU 14-1-2412-78	0.05-0.09	≤0.02	≤0.03	≤0.6	10.5-12	≤0.6	1.4-1.8	Rest	0.15-0.25	0.35-0.5	0.05-0.15	≤0.02
TU 14-1-2918-80	0.05-0.09	≤0.02	≤0.03	≤0.6	10.5-12	≤0.6	1.4-1.8	Rest	0.15-0.25	0.35-0.5	0.05-0.15	≤0.02

Fe is the basis.
According to TU 14-1-2271-77, TU 14-1-2412-78 and TU 14-1-2918-80, the chemical composition is given for steel grade 07X12HMBF-SH (EP609-Ш). Cerium is introduced into the metal by calculation and chemical analysis is not determined.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa	HRC
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	880-1080	-	-	-	262-311	23-34
Ring welded at OST 1 90231-76. Quenching in oil 1000-1050 °C + Vacation at 540-570 °C
	≥833	≥980	≥12	≥55	≥588	302-387	-
	≥755	≥883	≥7	≥30	≥294	-	-
Ring forged in OST 1 92049-76. Quenching in oil or air from 1000-1050 °C + Vacation at 630-670 °C, air cooling
30	≥785	≥910	≥10	≥50	≥735	-	-
Sheet of Kh/K (0.8-3.0 mm) and g/K to (2.0-3.0 mm). Without additional heat treatment in the delivery state (after annealing)
-	-	≤930	≥13	-	-	-	-
Sheet of Kh/K (0.8-3.0 mm) and g/K to (2.0-3.0 mm). Normalization 1040-1060 °C and leave at 640-660 °C, air cooling
-	640-830	830-1030	≥10	-	-	-	-
Sheet of Kh/K (0.8-3.0 mm) and g/K to (2.0-3.0 mm). Delivery condition + Tempering air with 1000-1050 °C + vacation at 630-670 °C, air cooling
-	≥735	≥833	≥10	-	-	-	-
Forgings. Annealing in air or in oil with 1000-1050 °C + Vacation at 630-670 °C, air cooling
	≥736	≥834	≥12	≥55	≥688	255-341	-
Strip (thickness 6,0-40,0 mm, width 400-480 mm). Annealing in air or in oil at 1000-1050 °C + vacation at 640-660 °C, air cooling
-	-	≥890	≥13	-	-	-	-
Strip (thickness 6,0-40,0 mm, width 400-480 mm). Delivery condition - after softening annealing
-	-	≤931	≥14	-	-	-	-

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
Particularities of production of goods	Ring welded at OST 1 90231-76 are supplied in the normalized and vysokoopasnye condition with hardness of the ≤285 HB (indentation diameter, mm) of at least 3.6.

Steel 07Х12НМБФ (ЭП609)

Designation

Description