VDM Alloys 22

Supplier, Manufacturer & Distributor in India.

VDM Alloy 22 is a nickel-chromium-molybdenum alloy with tungsten and extremely low carbon and silicon content.

VDM Alloy 22 is characterized by:

  • Extraordinary resistance across a wide range of corrosive media under oxidizing and reducing conditions
  • Particularly high resistance to the crevice, pitting, and stress corrosion shrink, opening angles of 60 to 70°.

VDM Alloys 22

Sailesh-Metal-Corporation-VDM-Alloys-22

VDm Alloys 22 Supplier

Sailesh-Metal-Corporation-VDM-Alloys-22-Supplier

VDM Alloys 22 Distributor

Sailesh Metal Corporation VDM Alloy 22 Distributor

Designations

Standard Material Designation
EN 2.4602 – NiCr21Mo14W
ISO NiCr21Mo14W3
UNS N06022

 Standards

Product form ASTM ASME DIN ISO NACE Sonstige
Sheet, plate B575 SB575 17750 17744 6208 9722 MR 0103/ISO 17945

MR 0175/ISO 15156

 VdTÜV 479
Strip B575 SB575 17744 18274 6208 MR 0175/ISO 15156 VdTÜV 479
Rod, bar B574

B564

 SB574

SB564

 17744

17752

 MR 0175/ISO 15156 MR 0103/ISO 17945
Wire 17744 DIN EN ISO 18274

Chemical Composition of VDM Alloy 22

Cr Mo   Ni    Fe W CO Mn V Si P C S
Min 20.0 12.5 bal 2.0 2.5
Max 22.5 14.5 6.0 3.5 2.5 0.50 0.35 0.08 0.025 0.015 0.02

Physical Properties of VDM Alloy 22

Density Melting range Brinell
7 g/m³ at 20 ° 1,360 – 1,400 °C 240
543 lb/ft² at 68 °F 2,470 – 2,550 °F

VDM Alloy 22 has a cubic, face-centered crystal structure.

Mechanical properties of VDM Alloy 22

The following minimum values at room and increased temperatures apply to the solution-annealed condition for longitudinal and traverse test samples of the specified dimensions. The properties for larger dimensions must be agreed upon separately.

Temperature Yield strength

Rp 0.2

 Yield strength

Rp 1,0

 Tensile strength                    Rm Elongation

A
°C °F MPa ksi MPa Ksi MPa ksi     %
20 68 310 45 335 48.6 690-950 100-138     45
100 212 270 39.2 290 42.1
200 392 225 32.6 245 35.5
300 300 195 28.3 215 31.2
400 752 175 25.4 195 28.3

Corrosion resistance

Due to the extremely low carbon and silicon concentrations, VDM® Alloy 22 has no propensity for grain boundary dispersions in hot forming or welding. This alloy can therefore be used in many chemical processes with both oxidizing and reducing media when welded. The high chrome, molybdenum, and nickel concentrations make the alloy resistant to chloride-ion attacks. The tungsten concentration further increases this resistance. VDM Alloy 22 is resistant to chlorine gas, hypochlorite, and chlorine dioxide solutions such as those that can be encountered in the cellulose industry. The alloy is characterized by excellent resistance to concentrated solutions of oxidizing salts (such as iron III and copper chloride).

Applications of VDM Alloy 22

VDM Alloy 22 has a broad field of application in the chemicals and petrochemicals industry and is used for components in organic processes that contain chloride and for catalytic systems. The material is especially effective in hot, contaminated mineral acids, solutions, organic acids (such as formic acid and acetic acid), or seawater. Other fields of application are:

  • Acetic acid production
  • Pharmaceuticals industry
  • Fine chemicals

Fabrication & Heat Treatment

VDM Alloy 22 can be easily formed both hot and cold and can also be machined

Heating

It is important that the workpieces are clean and free of any contaminations before and during heat treatment. Sulfur, phosphorus, lead and other low-melting point metals can result in material damage during the heat treatment. This type of contamination is also contained in marking and temperature-indicating paints or pens, and also in lubricating grease, oils, fuels and similar materials.

Hot forming

The material can be hot-formed in a temperature range between 1,100 and 900 °C (2,012 °F-1,652 °F) with subsequent rapid cooling down in water or air. Heat treatment after hot forming is recommended in order to achieve optimal properties.

Cold forming

VDM Alloy 22 has higher work hardening rate than other austenitic stainless steels. This should be taken into account when selecting forming equipment. The workpiece should be in the solution-annealed condition. Intermediate annealing is necessary for major cold forming work.

 Heat treatment

Solution annealing should take place at temperatures between 1,105 and 1,135 °C (2,021-2,075 °F). Cooling down should be accelerated with water to achieve optimum corrosion properties. Fast air cooling can also be carried out at thicknesses of less than approx. 1.5 mm. For strip and wire products, the heat treatment can be performed in a continuous furnace at a speed and temperature that is adapted to the material thickness.

Descaling and Pickling

Oxides of VDM Alloy 22 and heat tint in the area around welds adhere more strongly than in stainless steels. Grinding using extremely fine abrasive belts or grinding discs is recommended. It is imperative that grinding burns be avoided. Before pickling in nitric-hydrofluoric acid, the oxide layers should be destroyed by abrasive blasting or fine grinding, or pre-treated in salt baths.

Machining

VDM Alloy 22 should be machined in the solution-annealed condition. Because of the considerably elevated tendency toward work hardening in comparison with low-alloy austenitic stainless steels, a low cutting speed and a feed level that is not too high should be selected and the cutting tool should be engaged at all times.

Welding Information

When welding nickel alloys and special stainless steels, the following information should be taken into account:

Safety

The generally applicable safety recommendations, especially for avoiding dust and smoke exposure must be observed.

Workplace

A separately located workplace, which is specifically separated from areas in which C-steel is being processed, must be provided. Maximum cleanliness is required, and drafts should be avoided during gas-shielded welding.

Auxiliary Equipment and Clothing

Clean fine leather gloves and clean working clothes must be used.

Tools and Machines

Tools that have been used for other materials may not be used for nickel alloys and stainless steels. Only stainless steel brushes may be used. Processing and treatment machines such as shears, punches or rollers must be fitted (felt, cardboard, films) so that the workpiece surfaces cannot be damaged by the pressing in of iron particles through such equipment, as this can lead to corrosion.

Edge Preparation

Welding seam preparation should preferably be carried out using mechanical methods through lathing, milling or planing. Abrasive waterjet cutting or plasma cutting is also possible. In the latter case, however, the cut edge (seam flank) must be cleanly reworked. Careful grinding without overheating is also permissible.

Striking The Arc

The arc should only be struck in the seam area, such as on the weld edges or on an outlet piece, and not on the component surface. Scaling areas are areas in which corrosion more easily occurs.

Included Angle

Compared to C-steels, nickel alloys and special stainless steels exhibit lower heat conductivity and greater heat expansion. These properties must be taken into account by larger root openings or root gaps (1 to 3 mm, 0.039 to 0.118 in). Due to the viscosity of the welding material (compared to standard austenite) and the tendency to shrink, opening angles of 60 to 70°.