Steel 03Х21Н32М3Б (ЭП864; ЧС33)

Designation

Name	The value
Designation GOST Cyrillic	03Х21Н32М3Б
Designation GOST Latin	03X21H32M3B
Transliteration	03H21N32M3B
By chemical elements	03Cr21Н32Mo3Nb

Name	The value
Designation GOST Cyrillic	ЭП864
Designation GOST Latin	EP864
Transliteration	EhP864
By chemical elements	-

Name	The value
Designation GOST Cyrillic	ЧС33
Designation GOST Latin	ChC33
Transliteration	ChS33
By chemical elements	ZrС33

Description

03Х21Н32М3Б steel is used: for the manufacture of products, operating at high temperatures in special environments; steam generators for operation at temperatures up to +750 °C; oil refining equipment operating in environments with a high content of hydrogen sulfide and chlorides at temperatures up to +200 °C; casing and tubing for wells of oil and gas with a high content of hydrogen sulfide; a device for supplying gas mixture into wells; pipelines for sea water.

Standards

Name	Code	Standards
Blanks. Of the workpiece. Slabs	В31	OST 95-29-72, TU 14-1-2492-78, TU 14-1-720-73, TU 14-1-720-94
Processing of metals by pressure. Forgings	В03	TU 14-1-1603-76, TU 14-1-2513-78, TU 14-1-4737-89
Tape	В34	TU 14-1-2511-78
Bars and shapes	В32	TU 14-1-2512-78, TU 14-1-769-73
Sheets and strips	В33	TU 14-1-2863-79
Steel pipes and fittings to them	В62	TU 14-3-760-78, TU 14-159-251-95, TU 14-3-1316-85, TU 14-156-31-95, TU 14-3-758-78

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	N	Al	Ti	Mo	Nb
TU 14-1-2512-78	≤0.03	≤0.015	≤0.02	≤1	20-22	≤0.8	31.5-33	Rest	≤0.2	≤0.03	-	≤0.1	3-4	0.9-1.2
TU 14-159-251-95	≤0.03	≤0.01	≤0.015	1.3-1.7	20-22	≤0.35	31.5-33	Rest	-	-	-	-	3-4	0.9-1.2
TU 14-1-720-94	≤0.03	≤0.015	≤0.02	≤1	20-22	≤0.8	31.5-33	Rest	≤0.2	≤0.025	≤0.12	≤0.1	3-4	0.9-1.2
TU 14-1-769-73	≤0.03	≤0.015	≤0.015	1	20-22	≤0.8	31.5-33	Rest	≤0.2	≤0.025	-	-	3-4	0.9-1.2

Fe is the basis.
According to TU 14-159-251-95 the chemical composition is presented for steel grade 03Х21Н32МЗБ-ВИ (ЭП864-ВИ). In the chemical composition, the technological addition of yttrium and / or other rare-earth metals (REM) to 0.05% each is allowed. These elements are entered by calculation and chemical analysis are not determined, but are entered in the document on the quality of the pipes.
According to TU 14-1-720-73, the chemical composition is presented for steel grade 03X21N32MZB (EP864). tolerances in chemical composition within the limits of table 2 of GOST 5632 are allowed, with the exception of nitrogen. Deviations in nitrogen, carbon, chromium, nickel and other elements not provided in Table 2 of GOST 5632 are allowed by agreement of the parties.
According to TU 14-1-2492-78 the chemical composition is presented for steel grade 03Х21Н32МЗБ (ЭП864). The chemical composition of the steel allows deviations from the chemical composition within the limits of table 2 of GOST 5632, with the exception of nitrogen and niobium, for which the following deviations are allowed: for nitrogen +0.0050%, for niobium ± 0.050%.
According to TU 14-1-769-73, the chemical composition is presented for steel grade 03Х21Н32МЗБ-ВИ (ЭП864-ВИ). The chemical composition of the steel allowed deviations from the chemical composition within the limits of table 2 of GOST 5632, with the exception of nitrogen. Deviations are allowed for carbon, chromium, nickel and elements not listed in Table 2 of GOST 5632 - as agreed by the parties.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %
Rolled steel in the delivery state
	≥120	≥280	-	-
	≥216	≥540	≥28	-
Billet (forgings) OST 95-29-72 in the state of delivery: Austenization at 1020-1100 °C, cooling in water or air
	≥216	≥540	≥35	-
	≥167	≥440	-	-
Bars of steel 03Х21Н32М3Б-VI on the other 14-1-769-73. Austenization at 1050-1100 °C
	≥215	≥540	≥35	≥65
	≥167	≥440	≥35	≥55
	≥147	≥440	≥35	≥55
Tubular billet on the other 14-1-2492-78. Austenization at 980-1060 °C (holding time after heating 0.5 min/1 mm. cross section), cooling in water or air
	≥216	≥540	≥35	≥65
	≥167	≥440	≥35	≥55
	≥147	≥390	≥35	≥55
Tubular billet on the other 14-1-720-73. Austenization at 1050-1100 °C
	≥216	≥539	≥35	≥65
	≥167	≥441	≥35	≥55
	≥147	≥441	≥35	≥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
y	The relative narrowing

Technological properties

Name	The value
Weldability	Without restrictions.
Macrostructure and pollution	In the macrostructure of billets on the other 14-1-2492-78, THE 14-1-720-73 should be free of cracks, gas bubbles, traces of shrinkage, porosity, slag inclusions, visible to the naked eye. The steel is checked on the contamination of non-metallic inclusions. Norms of defects allowed by the maximum score should not exceed: - oxides of stroke - 2.0 points; the point oxides - 2.0 points; - silicates fragile - 2.0 points; - silicates plastic - 1.5 points; the non - deformed silicates - 2.0 points; - sulphides - 1.5 points; the nitrides of titanium and niobium - 4.0 points. The contamination of non-metallic inclusions of the metal tube blank on the other 14-1-720-73 produced by the method III-6 GOST 1778. The maximum score on the stroke oxides, oxides point, silicates, non-deformed not to exceed 2.0 points for each indicator; sulphides, silicates fragile, silicates plastic - no more than 1.5 points for each indicator; the nitrides of titanium and niobium is no more than 4.0 points.
Corrosion resistance	03Х21Н32М3Б steel has a high resistance to stress corrosion cracking and pitting corrosion in steam-water environments containing chlorides and hydrogen sulfide. The resistance to stress corrosion cracking in solutions of chlorides up to 100 times greater than that of steel 08KH18N10T and 80 times steel AISI 316L. For the resistance to ulcer formation is 5 times greater than that of steel 08KH18N10T and 4 times - steel AISI 316L. Steel in the delivery state should not have a tendency to ministering corrosion. Tests are conducted on cured samples (Austenization at 980-1060 °C (holding time after heating 0.5 min/1 mm. cross section), cooling in water or air) from the forge or perekatnoe billets with a diameter or a side of a square 80-100 mm method AM GOST 6032 with boiling for 15 hours after provoking heated to 650 °C with holding for 2 hours.