Steel 12H25N16G7AR (ЭИ835)

Steel 10Х11Н20Т2Р (ЭИ696А) 10X23H10 steel Steel 10Х23Н18 (0Х23Н18) Steel 12Х25Н16Г7АР (ЭИ835) Steel 20X23H18 (EI417) Steel 40Х10С2М (ЭИ107) Steel 40Х9С2 (4Х9С2) Steel 45Х22Н4М3 (EP48) Steel 55Kh20G9AN4 (EP303)

Designation

Name	The value
Designation GOST Cyrillic	12Х25Н16Г7АР
Designation GOST Latin	12X25H16G7AP
Transliteration	12H25N16G7AR
The chemical elements	12Cr25Н16Mn7NB

Name	The value
Designation GOST Cyrillic	ЭИ835
Designation GOST Latin	EI835
Transliteration	EhI835
The chemical elements	-

Description

12H25N16G7AR steel is used: for the production of sheets, wires, tubes, tapes, parts operating up to +950 °C at moderate loads; details of the turbine (parts of gas pipeline systems, combustion chambers, diaphragms, sheet metal parts), operating at temperatures up to +1050 °C and pressures up to 7760 kg/m³; the welding wire used for welding parts and welding of steel structures in energy engineering; welding electrodes; solid-rolled rings for different purposes.

Note

Heat-resistant steel and heat resistant austenitic class.
The recommended maximum operating temperature for a long time +1050 °C.
Temperature intense scaling in air +1100 °C.
Steel 12H25N16G7AR, it is recommended to replace heat-resistant Nickel-based alloys: KHN75MBTJU (ЭИ602), KHN78T (ЭИ435).

Standards

Name	Code	Standards
Sectional and shaped rolling	В22	GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Sheets and stripes	В23	GOST 19904-90, GOST 103-2006
Sheets and stripes	В33	GOST 4405-75, GOST 5582-75, GOST 7350-77, TU 14-1-1747-76
Tapes	В34	GOST 4986-79, TU 14-1-1007-74
Classification, nomenclature and general norms	В30	GOST 5632-72
Sectional and shaped rolling	В32	GOST 5949-75, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, OST 1 92049-76, TU 14-1-225-72, TU 14-1-3564-83, TU 14-11-245-88
Bulls. Blanks. Slabs	В21	OST 1 90176-75
Bulls. Blanks. Slabs	В31	OST 3-1686-90, OST 1 90160-74, OST 1 90387-89, TU 14-1-1214-75
Thermal and thermochemical treatment of metals	В04	ST ЦКБА 016-2005
Metal forming. Forgings	В03	TU 14-1-1530-75, TU 14-1-2902-80
Welding and cutting of metals. Soldering, riveting	В05	TU 14-1-997-74, TU 14-1-997-2012

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	N	V	B	Ti	Mo	W
TU 14-1-1747-76	≤0.12	≤0.02	≤0.035	5-7	23-26	≤1	15-18	The rest	≤0.2	0.3-0.45	-	≤0.01	-	-	-
GOST 5632-72	≤0.12	≤0.02	≤0.035	5-7	23-26	≤1	15-18	The rest	≤0.3	0.3-0.45	≤0.2	≤0.01	≤0.2	≤0.3	≤0.2
TU 14-1-225-72	≤0.12	≤0.02	≤0.035	5-7	23-26	≤1	15-18	The rest	-	0.3-0.45	-	≤0.01	-	-	-
TU 14-1-2902-80	≤0.12	≤0.015	≤0.035	5-7	23-26	≤1	15-18	The rest	≤0.3	0.3-0.45	≤0.2	≤0.01	≤0.2	≤0.3	≤0.2

Fe is the basis.
According to TU 14-1-2902-80 the chemical composition is given for 12Х25Н16Г7АР-Ш.
According to TU 14-1-225-72 the chemical composition is given for 12Х25Н16Г7АР and 12Х25Н16Г7АР-Ш. The 12Х25Н16Г7АР-Ш grade of the highest quality grade sets the phosphorus content P≤0,025%.

Mechanical characteristics

Section, mm	s_T\|s_0,2, MPa	σ_B, MPa	d₅, %	d₄	y, %	kJ/m², кДж/м²	Brinell hardness number, MPa
Blank pieces of pipe fittings and welded assemblies at ST CKBA 016-2005. Quenching in water from 1050-1150 °C (delay of 2.0 min/mm the largest section)
≤180	≥343	≥735	≥45	-	≥45	≥2450	163-217
Leaves. Annealing in air or in water 1050-1100 °C
	-	≥176	≥30	-	-	-	-
Steel cold-rolled sheet (0.8 to 3.9 mm) as supplied
-	-	≤980	≥35	-	-	-	-
Annealing in air or in water 1050-1150 °C (aging of 0.5-1.0 h)
Образец т/о	≥345	≥740	≥45	-	≥45	-	160-217
Forgings, rods, rolled and forged. Annealing in air or in water 1050-1150 °C (aging of 0.5-1.0 h)
	-	≥180	≥15	-	≥20	-	-
Steel cold-rolled sheet (0.8 to 3.9 mm) as supplied
-	-	≥180	≥30	-	-	-	-
Annealing in air or in water 1050-1150 °C (aging of 0.5-1.0 h)
	≥330	≥700	≥40	-	-	-	-
Rod. Annealing in air from 1150 °C (exposure 40 min)
-	380-440	770-850	45-67	49-78	-	-	-
Ring forged in OST 1 92049-76. Quenching in water or air from 1050-1150 °C (aging of 0.5-1.0 h)
25	≥345	≥735	≥38	-	≥38	-	-
Rod. Annealing in air from 1150 °C (exposure 40 min)
-	225-245	560-610	48-57	64-76	-	-	-
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79. Quenching in water or air at 1050-1100 °C (samples)
0.2-2	-	≥690	-	≥30	-	-	-
Rod. Annealing in air from 1150 °C (exposure 40 min)
-	205-225	510-580	40-53	56-74	-	-	-
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79. Quenching in water or air at 1050-1100 °C (samples)
0.2	-	≥690	-	≥15	-	-	-
Rod. Annealing in air from 1150 °C (exposure 40 min)
-	175-215	380-450	22-33	22-34	-	-	-
Hot rolled sheet (of 1.5-3.9 mm) and cold rolled (0,7-3,9 mm) steel according to GOST 5582-75. Quenching in water or air from 1050-1100 °C
	-	≥180	≥30	-	-	-	-
Rod. Annealing in air from 1150 °C (exposure 40 min)
-	165-205	275-350	19-28	24-40	-	-	-
Hot rolled sheet (of 1.5-3.9 mm) and cold rolled (0,7-3,9 mm) steel according to GOST 5582-75. Quenching in water or air from 1050-1100 °C
	-	≤980	≥35	-	-	-	-
Rod. Annealing in air from 1150 °C (exposure 40 min)
-	125-175	175-235	20-36	25-44	-	-	-
Hot rolled sheet (4,0-25,0 mm) and cold rolled (4,0-5,0 mm) steel according to GOST 7350-77. Annealing in air or in water 1050-1150 °C
	≥390	≥740	≥50	-	-	-	-
Rod. Annealing in air from 1150 °C (exposure 40 min)
-	49-98	98-135	50-64	43-60	-	-	-
Bars hot rolled and forged according to GOST 5949-75. Annealing in air or in water 1050-1150 °C
	≥325	≥690	≥40	-	≥45	-	-
Rod. Annealing in air from 1150 °C (exposure 40 min)
-	-	39-59	50-70	41-62	-	-	-
Forming at OST 1 90176-75. Annealing in air from 1050-1150 °C (aging of 0.5-1.0 h)
	≥343	≥736	≥45	-	≥45	-	163-217
Rod. Annealing in air from 1150 °C (exposure 40 min)
-	-	29-39	59-64	48-69	-	-	-

Description mechanical marks

Name	Description
Section	Section
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_B	Limit short-term strength
d₅	Elongation after rupture
d₄	Elongation after rupture
y	The relative narrowing
kJ/m²	Toughness

Physical characteristics

Temperature	Е, ГПа	r, кг/м3	l, Вт/(м · °С)	R, НОм · м	a, 10-6 1/°С
0	193	7820	14	1000	-
20	1965	7820	1382	1060	-
100	186	-	15	1100	166
200	178	-	16	1170	162
300	171	-	18	1200	168
400	163	-	19	1240	174
500	156	-	21	1280	18
600	147	-	22	1310	183
700	138	-	24	1330	185
800	131	-	26	1360	187
900	127	-	28	1390	187
1100	-	-	-	-	189

A description of the physical symbols

Name	Description
Е	The normal elasticity modulus
r	Density
l	Coefficient of thermal conductivity
R	UD. the resistivity
a	The coefficient of linear expansion

Technological properties

Name	The value
Weldability	Steel is welded all types of welding. Welded assemblies of steel grades 12H25N16G7AR, 12H25N16G7AR-sh should be subjected to heat treatment regime: quenching from temperatures from 950 °C to 1050 °C with air cooling. Heat treatment of welded assemblies, made of steel grades 12H25N16G7AR, 12H25N16G7AR-sh where allowed reduced compared to the base metal strength of weld and stress relief is not required, it is allowed to produce, in addition to Assembly operating at cryogenic temperatures.
Forging temperature	Beginning - 1170 °C, the end - 950 °C. air Cooling.
Features of heat treatment	The workpiece of steel grade 12H25N16G7AR diameter (thickness) of less than 10 mm is allowed to cool from the quenching temperature in the air.

Steel 12H25N16G7AR (ЭИ835)

Designation

Description

Note

Standards

Chemical composition

Mechanical characteristics

Description mechanical marks

Physical characteristics

A description of the physical symbols

Technological properties

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Steel 12H25N16G7AR (ЭИ835)

Designation

Description

Note

Standards

Chemical composition

Mechanical characteristics

Description mechanical marks

Physical characteristics

A description of the physical symbols

Technological properties

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