Alloy ХН55МВЦ (ЧС57)
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Designation
| Name | The value |
|---|---|
| Designation GOST Cyrillic | ХН55МВЦ |
| Designation GOST Latin | XH55MBTs |
| Transliteration | HN55MVTs |
| The chemical elements | CrNi55CuВZn |
| Name | The value |
|---|---|
| Designation GOST Cyrillic | ЧС57 |
| Designation GOST Latin | ChC57 |
| Transliteration | ChS57 |
| The 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 |
|---|---|---|
| Bulls. Blanks. Slabs | В31 | TU 14-1-1214-75, TU 14-1-4081-86, TU 14-1-4747-89 |
| Sectional and shaped rolling | В32 | TU 14-1-3663-83 |
| Sheets and stripes | 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 | The 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 | The 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 | The 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.
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 characteristics
| Section, mm | sT|s0,2, MPa | σB, 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 |
|---|---|
| Section | Section |
| sT|s0,2 | Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB | 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 contamination | 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. |
