Steel 03Х12Н10МТР (ЭП810; VNS-25)

Designation

Name	The value
Designation GOST Cyrillic	03Х12Н10МТР
Designation GOST Latin	03X12H10MTP
Transliteration	03H12N10MTR
By chemical elements	03Cr12Н10MoTiB

Name	The value
Designation GOST Cyrillic	ЭП810
Designation GOST Latin	EP810
Transliteration	EhP810
By chemical elements	-

Name	The value
Designation GOST Cyrillic	ВНС-25
Designation GOST Latin	BHC-25
Transliteration	VNS-25
By chemical elements	WНС-25

Description

03Х12Н10МТР steel is used: for the production of rolled steel; forgings, fabricated free forging used to manufacture parts of different sectors of the engineering method subsequent cold machining or hot for subsequent processing (forming, forging, rolling, etc.).

Note

Corrosion resistant steel martensitic class.

Standards

Name	Code	Standards
Bars and shapes	В22	GOST 1133-71, GOST 2590-2006, GOST 2591-2006
Classification, nomenclature and General rules	В20	OST 1 90005-91
Blanks. Of the workpiece. Slabs	В31	TU 14-1-1214-75, TU 14-131-855-92, TU 14-1-4207-86
Sheets and strips	В33	TU 14-1-1768-76, TU 14-1-3681-83, TU 14-1-4675-89, TU 14-1-4676-89
Bars and shapes	В32	TU 14-1-2235-77

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Al	B	Ti	Mo	Ca	Zr
TU 14-131-855-92	≤0.03	≤0.01	≤0.01	≤0.25	11.5-12.5	≤0.25	9-10.3	Rest	≤0.2	≤0.003	0.15-0.25	0.5-0.8	≤0.05	≤0.1
TU 14-1-1214-75	≤0.03	≤0.01	≤0.01	≤0.15	11.5-12.5	≤0.15	9-10.3	Rest	≤0.2	≤0.001	0.15-0.25	0.5-0.8	≤0.05	≤0.05

Fe is the basis.
According to TU 14-1-2235-77 and TU 14-1-4207-86 the chemical composition is given for steel 03Х12Н10МТР-ВД (ЭП810-ВД, ВНС-25). Boron, zirconium and calcium are introduced into the metal by calculation and chemical analysis are not determined. In the finished metal, deviations in chemical composition are allowed: by nickel -0.20%, by chromium -0.20%, titanium ± 0.050%, sulfur and phosphorus, provided that their total content in the metal is not more than 0.020%.
According to TU 14-1-1214-75, the chemical composition is given for steel for limited use 03Х12Н10МТРУ-ВД (ЭП810У-ВД). Boron, zirconium and calcium are introduced by calculation and chemical analysis are not determined. In the finished rolled steel the following chemical composition tolerances are allowed: chromium by -0.20%, titanium ± 0.050%, sulfur and phosphorus, provided that their sum is not more than 0.020%. The content of residual elements should not exceed: copper, vanadium and tungsten - no more than 0.20% each; niobium - no more than 0.15%. The content of the residual elements can not be determined.
According to TU 14-131-855-92, the chemical composition is given for steel for limited use 03H12N10MTRU-VD (EP810U-VD). In the finished metal, deviations in chemical composition are allowed: by nickel -0.20%, by chromium -0.20%, titanium ± 0.050%, sulfur and phosphorus, provided that their total content is not more than 0.020%. Boron, zirconium and calcium are introduced by calculation and chemical analysis are not determined. The content and allowable deviations from the residual elements are in accordance with GOST 5632. The content of the residual elements can not be 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
-	-	980-1080	-	-	-	248-302	26-32.2
-	-	-	-	-	-	262-302	26-35
Forgings of steel grade 03Х12Н10МТР-VD (ЭП810-VD) TU 14-131-855-92. The longitudinal samples. Quenching in water from 1000±10 °C + Quenched in water from 600±10 °C (exposure for 1 hour) + Aging at 500±10 °C (exposure 2 hours), air cooling. In the graph given the values of KCU KCU20°C/KCU-196°C
	≥590	≥690	≥18	≥60	≥1470/980	-	-
Bars hot rolled and forged (10-180 mm) TU 14-1-2235-77, tubular billet of forged or rolled on the other 14-1-4207-86. Quenching in water or air with 740-760 °C to cool [toughness at -196 °C, determined on specimen with heat treatment regime: Quenching in water or air with 740-760 °C to cool + Vacation at 490-510 °C (exposure 2 hours), air cooling] (KCU - +20/-196 °C) (samples with allowance for grinding)
	≥910	≥980	≥11	≥60	≥1373/785	-	-
Bars hot rolled and forged (10-180 mm). Quenching in water or air with 740-760 °C to cool + Vacation at 240-260 °C (exposure 2 hours), air cooling (KCU - +20/-196 °C)
	≥734	≥912	≥13	≥68	≥1373/980	-	-

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
Pressure treatment	Clan (extract ratio) tube blank on the other 14-1-4207-86 should be: - up to rod diameter 130 mm inclusive ≥ 5,0; - over rod diameter 130 mm ≥3,0.
Macrostructure and pollution	The macrostructure of billets on the other 14-1-4207-86 should not have cracks, bubbles, traces of shrinkage and looseness, slag inclusions and delaminations are visible without using the magnifying devices. The permissible defects of the macrostructure shall not exceed: Central porosity - 2 points; - phase separation in the square - 2 points; - point heterogeneity - 2 points. Evaluation of contamination of metal billets, non-metallic inclusions is made at the scales GOST 1778. In the metal allowed the presence of non-metallic inclusions is not more than: - oxides of stroke (OS) - 2 points; - point oxides (FROM) - 1.5 points; - silicates fragile (CX) - 1.0 points; - silicates plastic (SP) - 1.0 points; - silicates, non-deformed (CH) - 1.0 points; - sulphides (C) - 1.0 points; - nitrides and carbonitrides - 3.5 points. Macrostructure of steel forgings on the other 14-131-855-92 when testing for transverse templet, cut off from the forge billets with a diameter of 80-100 mm, or from supplied profile should not have shrinkage porosity, bubbles, cracks, crusts, inclusions, visible without using the magnifying devices. Pollution steel non-metallic inclusions on the average score shall not exceed the standards similar to THAT 14-1-4207-86.