Corrosion resistant

The special corrosion-resistant alloys comprise iron and nickel as a base. However, in order to obtain properties that exceed those of steel and therefore withstand extreme mechanical and corrosive applications, they also use chromium and other elements. As a result, such items are used in electronics, petrochemical and chemical industries.

Special corrosion-resistant alloys manufactured by Villares Metals:

VF562 (ASTM F562 / UNS R30035 / AMS 5844)

F562 is an austenitic Ni-Co-Cr-Mo alloy with ultra high mechanical strength (above 1200 MPa) associated with very high corrosion resistance, mainly to chlorides. Due to these properties, one of the main applications of this grade is as componentes and parts for marine environments like, for instance, cables which conduct sensors for measurements in deep ocean. F562 also is used in the automotive and aerospace industries. But, originally, this grade was developed for cirurgical implants. The strength hardening mechanism envolved is complex, involving a solution annealing heat treatment, followed by cold working and finally by an aging (precipitation hardening) heat treatment.

  • ABTN | ASTM | SAE | AISI | AMS: ASTM F562 / AMS 5844
  • UNS: UNS R30035 
  • Chemical Composition:
C %Si %Mn %Cr %Ni %Fe %Ti %Mo %OTHERS %
max. 0,02max. 0,15max. 0,1520,0035,00max. 1,00max. 1,0010,0Co = rest.

VRC20Nb3

Alloy stabilized with niobium to prevent sensitization and intergranular corrosion. The alloy has good resistance to general corrosion, with remarkable performance in solutions containing sulfuric acid. It is mainly used for tanks, heat exchangers, pumps and valves in chemical processes.

  • ABTN | ASTM | SAE | AISI: Alloy 20 | ASTM B473 | UNS NO8020
  • DIN | WNr: WNr 2.4660
  • Chemical Composition:
C %Si %Mn %Cr %Ni %Fe %Cu %OTHERS %
max. 0,051,02,020,035,0Rest.3,50Mo=2,50
Nb=0,70

VRC276

Excellent resistance to ferric and cupric chloride, mineral acids, chlorinated environments, formic and acetic acids, sea water and brine. Resistant to oxidation at temperatures up to 1040°C. It is widely used in chemical, petrochemical and oil industries.

  • ABTN | ASTM | SAE | AISI: Alloy C276 | ASTM B574 | UNS N10276
  • DIN | WNr: DIN 17744 | WNr 2.4819
  • Chemical Composition:
C %Si %Cr %Ni %Fe %OTHERS %
max. 0,01max. 0,0815,5Rest.5,5Mo=16,0
W=3,5

VRC400 (MONEL 400 / UNS N04400)

Resistant to corrosion by seawater and swamps under high-speed conditions and various acids, such as sulfuric, hydrochloric and hydrofluoric. Used in pump parts and valves, propeller shafts, descaling, pickling and etching equipment, and chemical processes.

  • ABTN | ASTM | SAE | AISI: Alloy 400 | ASTM B164 | UNS N04400
  • DIN | WNr: DIN 17743 | WNr 2.4360
  • Chemical Composition:
C %Ni %Fe %Cu %
0,16Rest.1,4532,5

VRC622

The VRC622 alloy has outstanding corrosion resistance, exceeding the VRC276 alloy with regard to generalized corrosion and pitting corrosion in a wide range of corrosive environments.

  • ABTN | ASTM | SAE | AISI: Alloy C22 | ASTM B574 | UNS N06022
  • DIN | WNr: WNr 2.4602
  • Chemical Composition:
C %Si %Mn %Cr %Ni %Fe %Cu %OTHERS %
max. 0,01max. 0,08max. 0,5022,3Rest.3,80max. 0,50Mo=14
W=3

VRC625 (Alloy 625 / UNS N06625)

Corrosion-resistant alloy that can be used in several harsh environments. The alloy is virtually immune to chloride-induced stress corrosion and, for this reason, it is used for components exposed to sea water. Widely used by the chemical and petrochemical industry, including cryogenic applications.

  • ABTN | ASTM | SAE | AISI: Alloy 625 | ASTM B446 | UNS N06625
  • DIN | WNr: DIN 17744 | WNr 2.4856
  • Chemical Composition:
C %Si %Mn %Cr %Ni %Fe %Ti %Al %OTHERS %
max. 0,05max. 0,30max. 0,1521,0Rest.max. 5,00max. 0,40max. 0,40Mo=8,5
Nb=3,3

VRC625QA (ASTM B446 / UNS N06625)

Resistant to corrosion in several aggressive environments. It is practically immune to chloride stress corrosion and, due to this, it is an alloy used in components that are exposed to the seawater. Used in the manufacturing of injection nozzles for aircraft and helicopter turbines.

  • ABTN | ASTM | SAE | AISI: ASTM B446 – B564 / UNS N06625
  • DIN | WNr: DIN 17744 | WNr 2.4856
  • Chemical Composition:
C %Si %Mn %Cr %Ni %Fe %Ti %Al %OTHERS %
max. 0,05max. 0,30max. 0,1521,0Rem.max. 5,00max. 0,40max. 0,40Mo=8,5 | Nb=3,3

VRC725

This is an alloy of high resistance to corrosion and high mechanical strength. The corrosion resistance is similar to that of the 625 alloy, but its mechanical strength is twice as much. This strength is developed by the precipitation of the γ” phase obtained by solubilization and aging heat treatment.

  • ABTN | ASTM | SAE | AISI: Inconel 725 | ASTM B637 e B805 | UNS N07725
  • DIN | WNr: –
  • Chemical Composition:
C %Si %Mn %Cr %Ni %Fe %Ti %OTHERS %
max. 0,03max. 0,2max. 3,521,057,0Rest.1,35Mo=8,0
Nb=3,5

VRC825 (Alloy 825 / UNS NO8825)

Excellent resistance to pitting and crevice corrosion due to the addition of chromium, molybdenum, copper and titanium alloy elements. Resistant to corrosion of many substances, including sulfuric acid containing chloride, and sea water.

  • ABTN | ASTM | SAE | AISI: Alloy 825 | ASTM B425 | UNS NO8825
  • DIN | WNr: –
  • Chemical Composition:
C %Cr %Ni %Fe %Cu %Ti %OTHERS %
max. 0,0421,042,0Rest.2,500,80Mo=3

VRC925

This is an alloy of high resistance to corrosion and high mechanical strength. The resistance is developed by the precipitation of the γ’ phase through solubilization and aging heat treatment, so as to maintain ductility and toughness at high levels. It is mainly used in components and parts for the production of natural gas and oil.

  • ABTN | ASTM | SAE | AISI: Inconel 925 | ASTM B637 e B805 | UNS N09925
  • DIN | WNr: –
  • Chemical Composition:
C %Si %Mn %Cr %Ni %Fe %Cu %Ti %Al %OTHERS %
max. 0,03max. 0,5max. 1,021,044,022,02,252,150,30Mo=2,5 – 3,5