Steel 12KH18N10T (18CR10NITI)

Designation

Name	The value
Designation GOST Cyrillic	12Х18Н10Т
Designation GOST Latin	12X18H10T
Transliteration	12H18N10T
By chemical elements	12Cr18Н10Ti

Name	The value
Designation GOST Cyrillic	Х18Н10Т
Designation GOST Latin	X18H10T
Transliteration	H18N10T
By chemical elements	Cr18Н10Ti

Description

The 12KH18N10T steel is used: for the manufacture of forgings parts, General machinery; parts of chemical equipment; parts operating at temperatures up to +600 °C; welding machines and vessels working in dilute solutions of nitric, acetic, phosphoric acids, alkaline solutions and salts; of parts working under pressure at temperatures from -196 to +600 °C, and in the presence of corrosive media up to +350 °C; details of aviation; consumer goods for the household; vehicles and parts in the food industry; connections of equipment working in radioactive environments and in contact with aggressive environment; as a cladding layer in the manufacture of hot-rolled dual-layer corrosion-resistant sheets; solid-rolled rings for different purposes, and rings welded from profiled sheet deformation for rotating equipment-plant engineering and chemical industries; cold-rolled steel and roll-formed sections, intended for the manufacture of oblivi and frame of body of passenger cars; sheet metal thickness from 40 mm to 160 mm, used in the manufacture of parts and structures of shipbuilding, working in conditions of sea water; ropes a double and a triple lay for special working conditions; cold-rolled seamless, cold drawn and replicating pipes intended for pipes and fittings of high quality; woven wire mesh twill weave, used as reinforcement material in the manufacture of asbestine sheets, for separating granular materials according to grain size, filtration and other purposes; spring wire, intended for the manufacture of cylindrical springs operating in air and aggressive environments (sea water, salt and chlorine solutions, pairs of seawater in a tropical climate) at temperatures from -253 °C to +300 °C and used in the seals of the turbines, safety valves, pumps, regulators, compressors; torsion springs; bimetallic sheets of aluminum alloy AMg6, intended for the manufacture of flat adapters General purpose; tsentrobezhnolityh pipes used as components in equipment for metallurgical, engineering, glass, ceramic, mining and processing petrochemical industry and is intended for the manufacture of blanks and parts used in the composition of the products of aviation and the nuclear industry.

Note

Steel corrosion resistant, heatresistant and heat-proof.
Stabilized chromium-Nickel steel of austenitic class.
The recommended maximum operating temperature for a long time +800 °C.
The recommended maximum operating temperature for a very long time +600 °C.
Temperature intense scaling in air 850 °C.

Standards

Name	Code	Standards
Bars and shapes	В22	GOST 1133-71, GOST 2590-2006, GOST 2879-2006
Test methods. Packing. Marking	В09	GOST 11878-66
Wire, steel, alloy	В73	GOST 18143-72, TU 3-230-84, TU 3-1002-77, TU 14-4-867-77
Processing of metals by pressure. Forgings	В03	GOST 25054-81, OST 108.109.01-92, OST 5Р.9125-84, OST 26-01-135-81, TU 108.11.930-87, TU 14-1-1530-75, TU 14-1-2902-80, TU 108.11.917-87, ST ЦКБА 010-2004
Tape	В34	GOST 4986-79, TU 3-703-92, TU 14-1-1073-74, TU 14-1-1370-75, TU 14-1-1774-76, TU 14-1-2192-77, TU 14-1-2255-77, TU 14-1-3166-81, TU 14-1-4606-89, TU 14-1-652-73, TU 14-1-3386-82
Sheets and strips	В33	GOST 5582-75, GOST 7350-77, GOST 10885-85, GOST Р 51393-99, TU 108-1151-82, TU 108-930-80, TU 14-105-451-86, TU 14-1-1150-74, TU 14-1-1517-76, TU 14-1-2186-77, TU 14-1-2476-78, TU 14-1-2542-78, TU 14-1-2550-78, TU 14-1-2558-78, TU 14-1-2675-79, TU 14-1-3199-81, TU 14-1-3720-84, TU 14-1-394-72, TU 14-1-4114-86, TU 14-1-4262-87, TU 14-1-4364-87, TU 14-1-4780-90, TU 14-1-5040-91, TU 14-1-5041-91, TU 14-1-867-74, TU 14-229-277-88, TU 14-138-638-93, TU 14-1-3485-82, TU 05764417-038-95, TU 14-1-4212-87
Classification, nomenclature and General rules	В30	GOST 5632-72
Bars and shapes	В32	GOST 5949-75, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 18907-73, OST 1 90224-76, OST 1 90365-85, TU 14-1-686-88, TU 14-1-1534-76, TU 14-1-1673-76, TU 14-1-2142-77, TU 14-1-2537-78, TU 14-1-2972-80, TU 14-1-3564-83, TU 14-1-3581-83, TU 14-1-377-72, TU 14-1-3818-84, TU 14-1-3957-85, TU 14-1-5039-91, TU 14-1-748-73, TU 14-11-245-88, TU 14-131-1110-2013, TU 14-1-1271-75
Steel pipes and fittings to them	В62	GOST 9940-81, GOST 9941-81, GOST 11068-81, GOST 14162-79, GOST 19277-73, TU 14-159-165-87, TU 14-3-1109-82, TU 14-3-1120-82, TU 14-3-1574-88, TU 14-3-308-74, TU 14-3-769-78, TU 1380-001-08620133-93, TU 14-159-249-94, TU 14-159-259-95, TU 1380-001-08620133-05, TU 14-158-135-2003, TU 14-3Р-110-2009, TU 14-3Р-115-2010, TU 14-131-880-97, TU 14-225-25-97, TU 14-158-137-2003, TU 95.349-2000, TU 14-3-1654-89, TU 1333-003-76886532-2014
Parts and assemblies common to the various machines and mechanisms	Г11	GOST Р 50753-95
Norms for calculation and design	В02	OST 1 00154-74
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 95-29-72, OST 1 90241-76, OST 1 90284-79, OST 1 90342-83, OST 1 90393-90, OST 1 90397-91, OST 1 90425-92, TU 3-1083-83, TU 14-105-495-87, TU 14-1-1214-75, TU 14-1-1924-76, TU 14-132-163-86, TU 14-1-3844-84, TU 14-1-4434-88, TU 14-1-565-84, TU 14-1-632-73, TU 14-1-685-88, TU 14-133-139-82, TU 14-3-770-78, TU 14-1-3129-81
Welding and cutting metals. Soldering, riveting	В05	OST 95 10441-2002, TU 14-1-656-73
Thermal and thermochemical treatment of metals	В04	STP 26.260.484-2004, ST ЦКБА 016-2005
Sheets and strips	В53	TU 1-9-1021-84, TU 1-9-1-84, TU 1-9-556-79, TU 1-9-1021-2008
Mesh metal	В76	TU 14-4-1569-89, TU 14-4-1561-89, TU 14-4-507-99
Steel wire rope	В75	TU 14-4-278-73

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	N	V	Mo	W	O
TU 1333-003-76886532-2014	≤0.12	≤0.02	≤0.035	≤2	17-19	≤0.8	9-11	Rest	≤0.4	-	≤0.2	≤0.5	≤0.2	-
TU 14-1-3844-84	≤0.12	≤0.02	≤0.035	≤2	17-19	≤0.8	10-11	Rest	≤0.4	-	≤0.2	≤0.5	≤0.2	-
TU 14-1-632-73	0.08-0.12	≤0.015	≤0.015	1-2	17-19	≤0.8	9-11	Rest	≤0.25	-	-	-	-	-
GOST 19277-73	≤0.12	≤0.015	≤0.015	≤2	17-19	≤0.8	9-11	Rest	≤0.25	-	-	-	-	-
TU 14-1-3581-83	≤0.12	≤0.02	≤0.03	≤2	17-19	≤0.8	9-11	Rest	≤0.4	-	≤0.2	≤0.3	≤0.2	-
TU 14-1-656-73	≤0.12	≤0.02	≤0.035	1-2	17-19	≤0.8	9-11	Rest	≤0.4	≤0.02	≤0.2	≤0.5	≤0.2	≤0.006
TU 14-1-748-73	≤0.12	≤0.02	≤0.04	≤2	17-19	≤0.8	9-11	Rest	≤0.4	-	≤0.2	≤0.5	≤0.2	-
TU 3-1002-77	0.09-0.12	≤0.02	≤0.035	1.5-2	17-18	≤0.8	10-11	Rest	≤0.4	-	≤0.2	≤0.5	≤0.2	-
TU 14-158-137-2003	≤0.12	≤0.02	≤0.035	≤2	17-19	≤0.8	9-11	Rest	-	-	-	-	-	-

Fe is the basis.
According to GOST 5632-72, TU 108-930-80 and TU 14-1-748-73, the content of Ti% = 5C% is 0.8%. For aircraft components, the Mo content is ≤ 0.30%.
According to TU 14-1-2902-80, the content of Ti% = 5 (C -0.02)% - 0.7%. At the customer's request, the content of Mn ≤ 1.0% can be set.
According to TU 14-1-2186-77 and TU 3-1002-77, the content of Ti% = 5 (C -0.02)% - 0.7%.
According to TU 14-158-137-2003 the content of Ti% = 5С% - 0,7%. It is permissible to introduce cerium and other rare-earth metals according to the calculation by 0.2-0.3%, which are not determined by chemical analysis.
According to TU 14-1-686-88 the chemical composition is given for 12Х18Н10Т-ВД steel. The content of Ti% = 5 (C-0.2)% - 0.7%. Deviations from the content of elements in the chemical composition of steel, not established by the specification - in accordance with GOST 5632.
According to GOST 19277-73 the chemical composition is given for 12Х18Н10Т-ВД steel; steel grade 12H18N10T must have a chemical composition in accordance with GOST 5632. The maximum deviation in chemical composition is in accordance with GOST 5632. The mass fraction of titanium in steels 12Kh18N10T and 12Kh18N10T-VD should be Ti% = 5 (C -0.02)% 0 , 7%.
According to TU 14-3Р-115-2010, the mass fraction of titanium in steel 08Х18Н10Т should be Ti% = 5С% - 0,7%, but not less than 0,30%.
According to TU 14-1-3581-83 the chemical composition is given for 12Х18Н10Т-ВД steel. The content of Ti% = 5C% is 0.8%.
According to TU 14-1-632-73, the chemical composition is given for 12Х18Н10Т-ВД steel. The titanium content is Ti = (C -0.02) x5% -0.7%. Allowed in the finished product deviations from the norms of chemical composition: for carbon -0.10%, for manganese -0.30%, for phosphorus +0.0050%.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	d₄	d	y, %	KCU, kJ/m²	HB, MPa
Tubes of small dimensions (capillary) heat-treated or cold-worked in the state of delivery according to GOST 14162-79
	-	≥549	≥35	-	-	-	-	-
Seamless pipes for oil and fuel lines, heat-treated in the delivery condition according to GOST 19277-73
	-	≥549	≥40	-	-	-	-	-
Rolled steel. Annealing 1050-1100 °C, air cooling
-	225-315	550-650	46-74	-	-	66-80	215-372	-
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	540-800	-	-	-	-	-	-
Billet (forgings) OST 95-29-72 in the state of delivery: Austenization at 1020-1100 °C, cooling in water or air
	≥246	≥520	≥37	-	-	-	-	-
Rolled steel. Annealing 1050-1100 °C, air cooling
-	135-205	390-440	30-42	-	-	60-70	196-353	-
Billet (forgings) OST 95-29-72 in the state of delivery: Austenization at 1020-1100 °C, cooling in water or air
	≥186	≥372	-	-	-	-	-	-
Rolled steel. Annealing 1050-1100 °C, air cooling
-	135-205	380-450	31-41	-	-	61-68	215-353	-
Blank pieces of pipe fittings according to ST CKBA 016-2005. Quenching in water or air with 1020-1100 °C (aging of 1.0 to 1.5 min/mm of maximum cross section but not less than 0.5 h)
≤60	≥196	≥490	≥40	-	-	≥55	-	121-179
Rolled steel. Annealing 1050-1100 °C, air cooling
-	120-205	340-410	28-38	-	-	51-74	196-358	-
Blank pieces of pipe fittings according to ST CKBA 016-2005. Quenching in water or air with 1020-1100 °C (aging of 1.0 to 1.5 min/mm of maximum cross section but not less than 0.5 h)
60-100	≥196	≥490	≥39	-	-	≥50	-	121-179
Rolled steel. Annealing 1050-1100 °C, air cooling
-	120-195	270-390	27-37	-	-	52-73	245-353	-
Blank pieces of pipe fittings according to ST CKBA 016-2005. Quenching in water or air with 1020-1100 °C (aging of 1.0 to 1.5 min/mm of maximum cross section but not less than 0.5 h)
100-200	≥196	≥490	≥38	-	-	≥40	-	121-179
Rolled steel. Annealing 1050-1100 °C, air cooling
-	120-195	265-360	20-38	-	-	40-70	255-353	-
Blank pieces of pipe fittings according to ST CKBA 016-2005. Quenching in water or air with 1020-1100 °C (aging of 1.0 to 1.5 min/mm of maximum cross section but not less than 0.5 h)
200	≥196	≥490	≥35	-	-	≥40	-	121-179
Ring selectany in the state of delivery according to OST 1 90224-76. Quenching in air, oil or water 1050-1100 °C
	≥196	≥510	≥40	-	-	≥55	-	-
Tape nagarebana in the state on the other 14-1-1073-74
-	-	≥834	-	≥5	-	-	-	-
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	-	≥530	-	≥35	-	-	-	-
0.2	-	≥530	-	≥18	-	-	-	-
Tape cold-rolled heat-treated with the etched surface without testirovanie in the state of delivery on the other 14-1-652-73
0.1-0.8	-	≥529	-	≥35	-	-	-	-
Hot rolled sheet (of 1.5-3.9 mm) and cold rolled (0,7-3,9 mm) steel according to GOST 5582-75. Without heat treatment
≤3.9	-	880-1080	≥10	-	-	-	-	-
≤3.9	-	≥740	≥25	-	-	-	-	-
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
	-	≥250	≥40	-	-	-	-	-
	≥205	≥530	≥40	-	-	-	-	-
Hot rolled sheet (4,0-50,0 mm) and cold rolled (4,0-5,0 mm) steel according to GOST 7350-77. Quenching in water or air from 1000-1080 °C
-	≥235	≥530	≥38	-	-	-	-	-
Cold-rolled sheet (0.7 to 5.0 mm) and hot-rolled steel (3,0-6,0 mm) of steel 12KH18N10T in the state of delivery on the other 14-1-2476-78. Quenching in water or air from 1050-1080 °C
-	-	≥540	≥40	-	-	-	-	-
Forgings for parts resistant to the ICC. Quenching from 1000-1050 °C in oil, water or air
100-300	≥196	≥510	≥38	-	-	≥45	-	121-179
60-100	≥196	≥510	≥39	-	-	≥50	-	121-179
60	≥196	≥510	≥40	-	-	≥55	-	121-179
Forgings. Quenching in water or air from 1050-1100 °C
1000	≥196	≥510	≥35	-	-	≥40	-	-
Forgings. Hardening in air, 1050-1100 °C, cooling in oil or water
	≥196	≥540	≥40	-	-	≥55	-	-
Spring wire groups (high-strength) and IN (high strength for critical applications) on the other 3-1002-77. Nagarebana on delivery
0.11-0.71	-	1720-2010	-	-	-	-	-	-
0.81-2.81	-	1720-2010	-	-	-	-	-	-
3.01-3.51	-	1670-1960	-	-	-	-	-	-
4.01	-	1620-1910	-	-	-	-	-	-
4.51	-	1620-1860	-	-	-	-	-	-
5.01-5.51	-	1570-1760	-	-	-	-	-	-
6.01	-	1520-1720	-	-	-	≥20	-	-
6.51	-	1470-1670	-	-	-	≥20	-	-
7.01-7.51	-	1420-1620	-	-	-	≥20	-	-
8.01	-	1370-1570	-	-	-	≥20	-	-
The wire spring group N (normal strength) on the other 3-1002-77. Nagarebana on delivery
0.51-6.01	-	≥1230	-	-	-	-	-	-
6.51-10.01	-	-	-	-	-	-	-	-
The wire is heat-treated in the delivery condition according to GOST 18143-72 (elongation, % at rated sample length of 100 mm is specified for the wire of the 1st class in brackets are for 2nd class)
0.2-1	-	590-880	-	-	≥25 (≥20)	-	-	-
1.1-7.5	-	540-830	-	-	≥25 (≥20)	-	-	-
Cold drawn wire in the delivery state according to GOST 18143-72
0.2-3	-	1130-1470	-	-	-	-	-	-
3.4-7.5	-	1080-1420	-	-	-	-	-	-
Hire in the delivery condition, without heat treatment
≤5	-	≥930	-	-	-	-	-	-
-	-	≥529	≥40	-	-	-	-	-
-	-	≥549	≥35	-	-	-	-	-
The cold rolled sheets and decks cold-shaped sections heat-treated in the delivery condition according to GOST R 51393-99. Quenching in water or air from 1050-1080 °C
-	≥205	≥530	≥40	-	-	-	-	-
Bars hot rolled and forged on the other 14-1-656-73. The longitudinal samples. Quenching in water from 1000-1050 °C
	-	≥510	≥40	-	-	≥55	-	-
Bars calibrated in delivery condition (cold-worked) on the other 14-1-3581-83
20-25	≥225	≥539	≥25	-	-	≥55	-	-
Bars on the other 14-1-3581-83. Quenching in air, oil or water from 1050-1100 °C
	≥196	≥539	≥40	-	-	≥55	-	-
Bars of polished, processed on a given strength (TS) according to GOST 18907-73
1-30	-	590-830	-	-	≥20	-	-	-
Bars hot rolled and forged according to GOST 5949-75. Quenching in air, oil or water with 1020-1100 °C
	≥196	≥510	≥40	-	-	≥55	-	-
Pre-painted steel sheet heat-treated (softening) on the other 14-1-3199-81
0.5-3	≥274.4	≥549.8	≥40	-	-	-	-	-
Tubular billet on the other 14-1-686-88. Quenching in water or air from 1050-1080 °C
	-	≥530	≥40	-	-	-	-	-
Tubular billet heat-treated on the other 14-1-3844-84. Samples of longitudinal and tangential
	-	≥529	≥40	-	-	-	-	-
	-	≥510	≥40	-	-	-	-	-
Bericochea tubes seamless cold-deformed (cold rolled, cold drawn and toplokatie) TU 14-3-769-78. Heat-treated in the delivery condition
	≥196	≥548.8	≥35	-	-	-	-	-
Seamless hot deformed tubes in the delivery condition according to GOST 9940-81
	-	≥529	≥40	-	-	-	-	-
Seamless tubes with a diameter up to 60 mm cold-worked state beyond 14-3-770-78
	≥196	≥550	≥35	-	-	-	-	-
Tubes seamless cold-and warm of improved quality in the delivery condition on the other 14-3-1109-82
	-	≥558	≥36	-	-	-	-	-
Pipe pressingly hex heat-treated on the other 14-131-880-97
	≥196	≥490	≥40	-	-	≥55	-	-
Pipe tsentrobezhnolityh heat-treated in the delivery condition according to TU 14-3P-115-2010. Quenching in water or air under the fan with 1050-1080 °C
	≥190	≥470	≥35	-	-	-	-	-
Pipe-welded heat-treated in the delivery condition (DH=8,0-102,0 mm)
	≥226	≥550	≥35	-	-	-	-	-
Forming at OST 1 90176-75. Quenching in air, oil or water from 1050-1100 °C
	≥196	≥540	≥40	-	-	≥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
d	Elongation after rupture
y	The relative narrowing
KCU	Toughness
HB	Brinell hardness number

Physical characteristics

Temperature	Е, HPa	G, HPa	r, kg/m³	l, W/(m · °C)	R, Mr. · m	a, 10^-6 1/°C	С, J/(kg · °C)
20	198	77	7920	15	725	-	-
100	194	74	-	16	792	166	462
200	189	71	-	18	861	17	496
300	181	67	-	19	920	172	517
400	174	63	-	21	976	175	538
500	166	59	-	23	1028	179	550
600	157	57	-	25	1075	182	563
700	147	54	-	27	1115	186	575
800	-	49	-	26	-	189	575
900	-	-	-	-	-	189	-
1100	-	-	-	-	-	193	-
1000	-	-	-	-	-	-	596

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
С	Specific heat

Technological properties

Name	The value
Weldability	Welded without any restrictions. Welding methods: SMAW (electrodes CT-26), ESW and the CCC. Recommended subsequent heat treatment. For NPP equipment - automatic arc welding with non-consumable electrode in a continuous mode, manual argon arc welding with non-consumable electrode (filler or without filler material) allowed manual arc welding with coated electrodes. For manual arc welding using electrodes of the EA-400/10U; for automatic submerged arc - wire Св04Х19Н11МЗ flux RP-6, welding wire SV-08Х19Н10МЗБ with flux an-26; for welding in shielding gas Ar welding wire SV-04Х19Н11МЗ or SV-08Х19Н10МЗБ. To prevent the tendency to stab corrosion of welded assemblies running in nitric acid welded assemblies are subjected to tempering in air 970-1020 °C; the temperature should be kept at the upper limit (the speed is not less than 2,5 min/mm of maximum wall thickness, but not less than 1 hour). In the case of welding wire SV 04Х19Н11М3 or electrodes type e-07Х19Н11М3Г2Ф (grade EA-400/10U, EA-400/10T, wire St 04Х19Н11М3, etc.) applied annealing in air from 950-1050 °C (aged for at least 2.5 minutes/mm of maximum wall thickness, but not less than 1 hour). In the case of welding electrodes type e-08Х19Н10Г2МБ (stamps EA 898/21 B, etc.) to relieve residual stresses in welded assemblies: a) working at 350 °C and above; b) operating at temperatures above 350 °C, if the hardening is impractical to apply a stabilizing annealing at 850-920 °C (extract after heating the batch for at least 2 hours). To relieve residual stresses of welded assemblies operating at temperatures above 350 °C, after final mechanical machining (before lapping) if the carrying out of other types of heat treatment applied is inappropriate vacation at 375-400 °C (delay of 6-10 h), air cooling. In the case of welding of pipes with internal diameter not less than 100 mm and more to the body (without delay) in accordance with KD applies a stabilizing annealing at 950-970 °C, air cooling.
The temperature of forging	Start - 1200 °C, the end - 850 °C. the cross Sections up to 350 mm cooled in air.
Flock-sensitive sensitivity	not sensitive.
Machinability	In the hardened state in HB 169 and blower SB=610 MPa Kn TV.SPL.=0,85 Kn b.St.=0,35.
Macrostructure and pollution	Macrostructure of steel shall be no traces of shrinkage, delamination, foreign inclusions. The macrostructure of the steel on the other 14-1-686-88 should not have shrinkage, porosity, bubbles, cracks, inclusions, crusts, delamination and placenow visible without using the magnifying devices. For Central porosity, spot inhomogeneity and phase separation the square of the defects of the macrostructure should not exceed the score of I for each type. The presence of layer-by-layer crystallization and the bright contour in the macrostructure of metal is not a rejection symptom. The content of nonmetallic inclusions in steel, the maximum score shall not exceed: oxides and silicates (ON, OS, SH, SP, SN) - 2 points; sulfide (S) - 1 points, nitrides and carbonitrides of titanium (NT) - 4.5 points.
Microstructure	The content of ferrite phase (alpha-phase) bars with a diameter or a side of a square of 80 mm or more must not exceed 1.5 points (4-5 %). Bars with a diameter or side of less than 80 mm and the strip is not subjected to a determination of the ferritic phase.
Features of heat treatment	Depending on assignment, working conditions, corrosive environment the product is subjected to: a) hardening (austenization); b) stabilizing annealing; C) annealing for stress relieving; d) a stepwise processing. The product is quenched in order to: a) prevent the tendency to intergranular corrosion (products can operate in temperatures up to 350 °C); b) to increase resistance against General corrosion; C) to eliminate the revealed tendency to intergranular corrosion; g) to prevent the tendency to stab corrosion (welded work product in solutions of nitric acid); d) to eliminate residual stress (products simple configuration); e) to increase the plasticity of the material. The quenching products should be carried out on mode: heating to 1050-1100 °C, items material thickness up to 10 mm cooling on air, more than 10 mm in water. Welded parts of complex configuration in order to avoid the leash is to be cooled in the air. The holding time at the heating for hardening to products with a wall thickness up to 10 mm - 30 min, over 10 mm - 20 min + 1 min per 1 mm maximum thickness. In the hardening of products, intended for operation in nitric acid, the heating temperature for hardening must be kept at the upper limit (exposure at the same weldment should be not less than 1 hour). Stabilizing annealing is applied to: a) prevent the tendency to intergranular corrosion (products work at temperatures above 350 °C); b) stress relief; C) the elimination of discovered tendency to intergranular corrosion, if for any reason hardening is inappropriate. A stabilizing annealing, for example for products and welded joints of steels in which the ratio of titanium to carbon 5 or more of niobium to carbon greater than 8. Stabilizing annealing to prevent the tendency to intergranular corrosion products, operating at temperatures over 350 °C can be subjected to steel containing not more than 0.08 % of carbon. Stabilising annealing should be carried out according to the mode: heating up to 870-900 °C, exposure time of 2-3 h, cooling in air. During heat treatment of large welded products are permitted to carry out local stabilizing annealing of closing seams in the same mode, with all welded components shall be subjected to a stabilizing annealing before welding. In the case of local stabilizing annealing is necessary to ensure both uniform heating and cooling across the length of the weld and adjacent base metal zones for a width equal to two or three widths of a seam, but not more than 200 mm. Manual heating method is invalid. For a more complete removal of residual stresses, the annealing products of stabilized chromium-Nickel steels is performed according to the mode: heating up to 870-900 °C; exposure of 2-3 h, cooling with the furnace to 300 °C (cooling rate of 50-100 °C/h), then by air. The annealing is carried out for products and welded joints of steel, from which the ratio of titanium to carbon 5 or more of niobium to carbon greater than 8. Step processing is to: a) relieve residual stresses and prevent the tendency to intergranular corrosion; b) to prevent the tendency to intergranular corrosion of welded joints of complex configuration with sharp transitions in thickness; C) products with the tendency to intergranular corrosion, remove which other method (annealing or stabilizing annealing) is inappropriate. Step treatment should be carried out according to mode: heating to 1050-1100 °C; the holding time at the heating for hardening to products with a wall thickness up to 10 mm - 30 min, over 10 mm - 20 min + 1 min per 1 mm of maximum thickness; cooling as fast as possible to 870-900°C; holding at 870-900 °C for 2-3 hours; cooling with the furnace to 300 °C (speed of 50-100 °C/h), then by air. To expedite the process, step-by-step treatment is recommended in two in two furnaces heated to different temperatures. When transferring from one furnace to another, the temperature of the products should not be below 900 °C. Speed of processing permitted for products and welded joints of steel, from which the ratio of titanium to carbon 5 or more of niobium to carbon greater than 8.
Corrosion resistance	Steel resistant to intergranular corrosion. Steel is unstable in sulfur-containing environments and is used when cannot be applied, Nickel-free steel. The steel should not have the tendency to intergranular corrosion.