12H17G9AN4 steel is used: for the manufacture of products, working in atmospheric conditions at temperatures up to +350 °C; devices operating in atmospheric conditions; products for the aviation industry; welding wire used for welding parts and welding of steel structures in energy engineering; welding electrodes.

Note

Steel corrosion resistant austenitic class.
Steel 12H17G9AN4 recommended as a substitute for steel grades 12H18N9 and 12KH18N10T in products for atmospheric conditions.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 19904-90
Tape	В34	GOST 4986-79, TU 14-1-2410-78
Sheets and strips	В33	GOST 5582-75, GOST 7350-77, TU 14-1-2186-77, TU 14-1-3308-82
Classification, nomenclature and General rules	В30	GOST 5632-72
Bars and shapes	В32	GOST 5949-75, TU 14-1-377-72, TU 14-11-245-88
Classification, nomenclature and General rules	В20	OST 1 90005-91
Blanks. Of the workpiece. Slabs	В21	OST 1 90176-75
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, OST 1 90240-76, OST 1 90350-84, TU 14-1-85-71
Processing of metals by pressure. Forgings	В03	TU 14-1-1530-75, TU 14-1-2902-80
Welding and cutting metals. Soldering, riveting	В05	TU 14-1-997-74, TU 14-1-997-2012
Steel pipes and fittings to them	В62	TU 14-3-733-78

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	N	V	Ti	Mo	W
TU 14-1-2902-80	≤0.12	≤0.015	≤0.035	8-10.5	16-18	≤0.8	3.5-4.5	Rest	≤0.3	0.15-0.25	-	≤0.2	≤0.3	-
TU 14-1-997-74	≤0.12	≤0.02	≤0.035	8-10.5	16-18	≤0.8	3.5-4.5	Rest	≤0.2	0.15-0.25	-	-	-	-
TU 14-1-2186-77	≤0.12	≤0.02	≤0.035	8-10.5	16-18	≤0.8	3.5-4.5	Rest	≤0.3	0.15-0.25	≤0.2	≤0.2	≤0.3	≤0.2

Fe is the basis.
According to TU 14-1-2902-80 the chemical composition is given for 12Х17Г9АН4-Ш.
According to TU 14-1-2186-77 for steel smelted with electroslag remelting the content of S ≤ 0.015%.
According to TU 14-1-2410-78, the chemical composition is presented for steel grade 12X17G9AN4 (EI878).

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d₄	y, %
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	≥690	-	-	-
Ring welded at OST 1 90350-84. Quenching in water from 1050-1100 °C, cooling in water
-	≥343	≥687	≥45	-	≥55
-	≥294	≥637	≥30	-	≥40
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79 on delivery
0.2-2	-	≥1180	-	≥5	-
0.2	-	≥1180	-	≥3	-
0.2-2	-	≥980	-	≥13	-
0.2	-	≥980	-	≥7	-
0.2-2	-	810-980	-	≥30	-
0.2	-	810-980	-	≥15	-
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79. Quenching in water or air from 1050-1080 °C (samples)
0.2-2	-	≥640	-	≥40	-
0.2	-	≥640	-	≥20	-
Sheet full hard GOST 5582-75. Without heat treatment
≤3.9	-	≥980	≥15	-	-
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 1050-1080 °C
-	-	≥690	≥40	-	-
Hot rolled sheet (4,0-25,0 mm) and cold rolled (4,0-5,0 mm) steel according to GOST 7350-77. Quenching in water with 1030-1100 °C
-	≥345	≥690	≥40	-	-
Bars hot rolled and forged GOST 5949-75 + Forgings. Quenching in water, oil or air from 1050-1100 °C
	≥345	≥690	≥45	-	≥55
Forming at OST 1 90176-75. Quenching in water from 1050-1100 °C
	≥343	≥687	≥45	-	≥55

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
y	The relative narrowing

Steel 12H17G9AN4 (ЭИ878)

Designation

Description

Note

Standards

Chemical composition

Mechanical properties

Description mechanical marks

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