Alloy ХН55МВЦ (ЧС57)

Designation

Name	The value
Designation GOST Cyrillic	ХН55МВЦ
Designation GOST Latin	XH55MBTs
Transliteration	HN55MVTs
By chemical elements	CrNi55CuВZn

Name	The value
Designation GOST Cyrillic	ЧС57
Designation GOST Latin	ChC57
Transliteration	ChS57
By chemical elements	ЧPb57

Description

Alloy ХН55МВЦ used: for the manufacture of prefabricated tubular billets and pipes, thin-walled tubes for critical applications (ХН55МВЦУ-VI); forged bars, hot and cold rolled sheet metal; parts and accessories of aerospace engineering.

Standards

Name	Code	Standards
Blanks. Of the workpiece. Slabs	В31	TU 14-1-1214-75, TU 14-1-4081-86, TU 14-1-4747-89
Bars and shapes	В32	TU 14-1-3663-83
Sheets and strips	В33	TU 14-1-4392-88, TU 14-1-4400-88

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	N	Al	B	Ti	Mo	W	Zr	Y
TU 14-1-3663-83	≤0.05	≤0.01	≤0.015	1.3-1.7	18-20	≤0.3	53-56	Rest	-	≤0.03	≤0.15	≤0.005	-	5-7	2-3	0.05-0.15	≤0.05
TU 14-1-4747-89	≤0.05	≤0.01	≤0.015	1.3-1.7	18-20	≤0.3	53-56	Rest	≤0.07	≤0.03	≤0.15	0.005	≤0.1	5-7	2-3	0.05-0.15	0.05
TU 14-1-4400-88	≤0.04	≤0.01	≤0.015	1.3-1.7	18-20	≤0.3	53-56	Rest	-	≤0.03	≤0.15	0.005	-	5-7	2-3	0.05-0.15	0.05

Ni is the basis.
According to TU 14-1-3663-83, the chemical composition is given for the alloy grade KhN55MVC-VI. Yttrium and boron are introduced into the metal by calculation and chemical analysis are not determined. Allowed for the introduction of calcium into the alloy by calculation of 0.10%, zirconium by 0.10% by calculation. Limit deviations in chemical composition - in accordance with GOST 5632.
According to TU 14-1-4081-86, the chemical composition is given for an alloy of the grade KhN55MVC-VI (ChS57-VI), vacuum induction melting on especially pure materials. Allowed the introduction of calcium into the alloy as calculated by 0.10%. Yttrium, boron and calcium are introduced into the metal by calculation and chemical analysis are not determined. The maximum deviations from the norms of chemical composition must not exceed the tolerances in accordance with GOST 5632. The mass fraction of the residual elements in the alloy must comply with GOST 5632.
In the alloy grade HN55MVTSU-VI (ChS57U-VI) boron is absent. The permissible content in the alloy of grade ХН55МВЦУ-ВИ (ЧС57У-ВИ) hafnium ≤0,150%, cerium ≤0,030%.
According to TU 14-1-4400-88 the chemical composition is given for an alloy of grades ХН55МВЦ (ЧС-57), ХН55МVЦ-VI (ЧС57-ВИ).
According to TU 14-1-4747-89, the chemical composition is given for an alloy of the brand KhN55MVTS-VI (ChS57-VI). Yttrium and boron are introduced into the metal by calculation and chemical analysis are not determined.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %
Steel hot-rolled sheet in the delivery condition on the other 14-1-4400-88. Austenization at 1100 °C (3minutes per 1 mm of sheet thickness), cooling in air or under water shower
-	≥215	≥560	≥40	-
Tubular billet on the other 14-1-4081-86. Austenization at 1100 °C, air cooling
20-25	≥245	≥590	≥40	≥65
20-25	≥127	≥230	≥45	≥55
20-25	≥118	≥160	≥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
y	The relative narrowing

Technological properties

Name	The value
Pressure treatment	The degree okowa a tube blank on the other 14-1-4081-86 must be at least 2.5.
Macrostructure and pollution	In the macrostructure of billets on the other 14-1-4081-86 should not be cracked, subcortical bubbles, traces of shrinkage, inclusions, delaminations, and other defects visible to the naked eye. Permitted in the macrostructure of the Central porosity, point heterogeneity as well as the exudation of a square no more than 1 point on the scale GOST 10243. The content of nonmetallic inclusions in the metal tube blank, as measured by the maximum score method, s-6 GOST 1778, shall not exceed: - sulphides (C) - 1.5 points; - oxides of stroke (OS) - 3.5 points; - point oxides (ON) - 2.0 points; - silicates fragile (CX) - 1.0 points; - silicates plastic (SP) - 1.0 points; - silicates, non-deformed (CH) - 1.0 points; - nitrides (N) - 2.0 points. In the macrostructure of wrought-iron bars on the other 14-1-3663-83 on cross etched templeto should not be intergranular cracks, pores, subcortical bubble, podnasadochnogo looseness, residues shrinkage, foreign non-metallic microflute, bundles for forging and intercrystalline cracks and other defects visible to the naked eye. Permitted in the macrostructure of the Central porosity, phase separation of the square not more than 1 score but scales GOST 10243, dot-spotted heterogeneity according to GOST 22838, which is a symptom of rejection is not. Content of nonmetallic inclusions in steel forged bars shall not exceed: - sulphides (C) - 1.5 points; - oxides of stroke (OS) - 3.5 points; - point oxides (ON) - 2.0 points; - silicates fragile (CX) - 2.0 points; - silicates plastic (SP) - 2.0 points; - silicates, non-deformed (CH) - 2.0 points; - nitrides (N) - 2.0 points.