Steel 12H21N5T (ЭИ811; 1Х21Н5Т)

Designation

Name	The value
Designation GOST Cyrillic	12Х21Н5Т
Designation GOST Latin	12X21H5T
Transliteration	12H21N5T
By chemical elements	12Cr21Н5Ti

Name	The value
Designation GOST Cyrillic	ЭИ811
Designation GOST Latin	EI811
Transliteration	EhI811
By chemical elements	-

Name	The value
Designation GOST Cyrillic	1Х21Н5Т
Designation GOST Latin	1X21H5T
Transliteration	1H21N5T
By chemical elements	1Cr21Н5Ti

Description

12H21N5T steel is used: for the manufacture of welded and brazed structures in corrosive environments; solid-rolled rings for different purposes; welding wire.

Note

Austenite corrosion resistant steel-ferritic class.
Steel has higher strength compared with steel 08KH22N6T and the best ability for soldering in comparison with steel 08KH18N10T.

Standards

Name	Code	Standards
Steel pipes and fittings to them	В62	GOST 11068-81, TU 14-3-1327-85
Tape	В34	GOST 4986-79, TU 14-1-2298-77, TU 14-1-2299-77
Sheets and strips	В33	GOST 5582-75, GOST 7350-77, TU 14-1-1150-74, TU 14-1-2476-78, TU 14-1-617-73
Classification, nomenclature and General rules	В30	GOST 5632-72
Bars and shapes	В32	GOST 5949-75, OST 1 92049-76, TU 14-1-1273-75, TU 14-1-1283-75, TU 14-11-245-88
Blanks. Of the workpiece. Slabs	В31	OST 3-1686-90, OST 1 90232-76
Thermal and thermochemical treatment of metals	В04	STP 26.260.484-2004
Welding and cutting metals. Soldering, riveting	В05	TU 14-1-1464-75
Processing of metals by pressure. Forgings	В03	TU 3-1585-89, TU 14-1-1530-75, TU 14-1-2918-80

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	Al	V	Ti	Mo	W
TU 14-1-2476-78	0.09-0.14	≤0.02	≤0.035	≤0.8	20-22	≤0.8	5.3-5.8	Rest	-	≤0.08	-	0.25-0.5	-	-
TU 14-1-2918-80	0.09-0.14	≤0.02	≤0.03	≤0.8	20-22	≤0.8	4.8-5.8	Rest	≤0.3	≤0.08	≤0.2	0.25-0.5	≤0.3	≤0.2
TU 14-3-1327-85	0.09-0.14	≤0.02	≤0.025	≤0.8	20-22	≤0.8	5.3-5.8	Rest	-	≤0.08	-	0.25-0.5	-	-
GOST 5632-72	0.09-0.14	≤0.025	≤0.035	≤0.8	20-22	≤0.8	4.8-5.8	Rest	≤0.3	≤0.08	≤0.2	0.25-0.5	≤0.3	≤0.2

Fe is the basis.
According to TU 14-1-2918-80 the chemical composition is given for steel grade 12Х21Н5Т-ВД. Cerium is introduced into steel by calculation and chemical analysis is not determined.
According to TU 14-3-1327-85, the chemical composition is given for steel grades 12Х21Н5Т (ЭИ811), 12Х21Н5Т-ВД (ЭИ811-ВД). The residual content of elements is allowed in accordance with GOST 5632. At the same time, deviations are allowed: for carbon +0.010%, for nickel -0.20%, for titanium -0.050%. For steel 12Х21Н5Т-ВД (ЭИ811-ВД) the sulfur content should not be more than 0,015%.
According to TU 14-1-2476-78, the chemical composition is given for steel grade chemical composition is given for steel grades 12Х21Н5Т (ЭИ811), 12Х21Н5Т-ВД (ЭИ811-ВД), 12Х21Н5Т-Ш (ЭИ811-Ш). In the finished product, deviations in chemical composition are allowed: for titanium -0,050%, for nickel -0,20%, for carbon +0,010%, for aluminum +0,020%. For the Zaporizhstal plant, nickel content limits of 4.80-5.80% are allowed in steel. In the finished product, deviations in the chemical composition of the remaining elements are allowed in accordance with GOST 5632.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d₄	y, %	KCU, kJ/m²
Ring welded at OST 1 90232-76. Quenching in water or air from 950-1050 °C
-	≥343	≥686	≥16	-	≥45	≥588
-	≥297	≥637	≥12	-	≥25	≥441
Ring forged in OST 1 92049-76. Quenching in water or air from 950-1050 °C
15	≥345	≥685	≥12	-	≥36	≥441
15	≥345	≥685	≥15	-	≥38	≥490
Cold-rolled steel strip of 0.05-2.00 mm according to GOST 4986-79. Quenching in water or air from 950-1050 °C (samples)
0.2-2	-	≥690	-	≥15	-	-
0.2	-	≥690	-	≥8	-	-
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 1000-1080 °C
-	≥440	≥690	≥18	-	-	-
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 or air from 950-1050 °C
-	≥390	≥690	≥14	-	-	-
Cold-rolled sheet (0.7 to 5.0 mm) and hot-rolled steel (3,0-6,0 mm) made of steel 12H21N5T in the state of delivery on the other 14-1-2476-78. Quenching in water or air from 1000-1080 °C. the elongation specified for the transverse specimens / samples for longitudinal
	≥441	≥686	≥18/20	-	-	-
Bars hot rolled and forged according to GOST 5949-75. Forgings. Quenching in water or air from 950-1050 °C
	≥315	≥690	≥16	-	≥45	≥588
Bars hot rolled and forged according to GOST 5949-75. Forgings. Annealing in air 1000-1050 °C + cold Treatment at minus 60-100 °C (endurance 4 hours) + Vacation at 100-200 °C (aging 2-3h), air cooling
	≥345	≥690	≥16	-	≥45	≥588
Bars hot rolled and forged at STP 26.260.484-2004. Annealing in air 1020-1050 NN the fire °C
	≥350	≥700	≥20	-	≥40	≥588
Tubes seamless cold - and warm in the delivery condition on the other 14-3-1327-85 after termoobrabotki and etching
-	343-588	686-932	≥17	-	-	-
Tubes seamless cold - and warm on the other 14-3-1327-85 after hot processing. Quenching in water from 950-1000 °C (exposure for 1 h) and cooling with furnace at a rate of 100 °C/h to 300 °C, then air cooling
	-	-	-	-	-	≥392

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
KCU	Toughness

Technological properties

Name	The value
Macrostructure and pollution	Macrostructure of steel shall be no traces of shrinkage, delamination, foreign inclusions.
Features of heat treatment	Steel products to eliminate the tendency to intergranular corrosion are subjected to hardening regime: heating to 1050±25 °C, exposure during heating for quenching for products with wall thickness up to 10 mm - 30 min, over 10 mm — 20 min + 1 min per 1 mm max thickness cooling in water or air. Products austenite-ferritic steels do not require heat treatment after welding.