VAG’s Variety of Materials

VAG's Variety of Materials

VAG offers a great variety of materials for the most diverse applications. What material should be chosen depends on various factors, such as customer specifications, heat resistance, the pressure acting on a valve, the medium flowing through a valve or the size of the valve. 

On this page, VAG gives you a general overview of the materials the bodies of most of VAG’s valves are made of. Generally, these materials can be subdivided into three categories: cast iron, steel and stainless steel. The following sections explain the most important types of these three categories. The names used are as per the current DIN EN material codes and numbers, the ASTM code and also as per the old GG codes.

Cast Iron

EN-GJL-250 (EN-JL 1040; GG-25; ASTM A 48 40 B)

Characteristic properties: EN-JL 1040 cast iron is an iron-carbon-silicon casting alloy whose lamellar graphite provides the cast iron with good self-lubricating properties when it is cut during processing.

Advantages of EN-JL 1040 cast iron

  • good castability
  • good machinability
  • vibration damping
  • good thermal conductivity
  • good corrosion resistance

Areas of application: This cast material is primarily used for machine tool building, for machine beds, marine diesel engines, steam turbine housings, pumps and valves.

EN-GJS 400-15 (EN-JS 1030; GGG-40; ASTM A 536 Gr. 60-40-18)

Characteristic properties: EN-JS 1030 cast iron is an iron-carbon-silicon casting alloy in which the graphite is present in the form of spheroids. Due to its good castability as well as its good strength and toughness, the properties of this material are similar to those of steel.

Advantages of EN-JS 1030 cast iron

  • high elongation at break
  • high tensile strength

Areas of application: This cast material is primarily used for motors, compressors, turbines, in mining and shipbuilding, in metallurgy and machine building as well as in the manufacturing of valves as an innovative material.

EN-GJS-400-18-LT (EN-JS 1025; GGG-40.3)

Characteristic properties: EN-JS 1025 cast iron is an iron-carbon-silicon casting alloy in which the graphite is present in the form of spheroids.  Due to its good castability as well as its good strength and toughness, the properties of this material are similar to those of steel.

Advantages of EN-JS 1025 cast iron

  • very high elongation at break
  • very high impact bending strength
  • very high notched bar impact strength

Areas of application: This cast material is primarily used for motors, compressors, turbines, in mining and shipbuilding, in metallurgy and machine building as well as in applications with low temperatures or higher nominal pressures.

EN-GJS-500-7 (EN-JS 1050; GGG-50; ASTM A 536 Gr. 65-45-12)

Characteristics properties: EN-JS 1050 cast iron is an iron-carbon-silicon casting alloy in which the graphite is present in the form of spheroids.

Advantage of EN-JS 1050 cast iron

  • high tensile strength

Disadvantage of EN-JS 1050 cast iron

  • low elongation at break

Areas of application: This cast material is primarily used for motors, compressors, turbines, in mining and shipbuilding, in metallurgy and machine building. In valve manufacturing this material is considered obsolete and is therefore used only occasionally.

Steel

Structural steel (S 355 J 2 WP / S 355 J 2; ASTM A 242 Type 1 / ASTM A 572 Gr. 50)

Characteristic properties: This steel is used for constructional steelwork and hydraulic steel construction.

Advantages of structural steel

  • weatherproof
  • less susceptible to corrosion
  • lower sheet/plate thickness
  • does not need to be pre-heated
  • smaller seam volume

Areas of application: This steel is mainly used for constructional steelwork, in industry, in buildings, in bridge construction, for heavy road vehicles and for cranes.

Forged steel (P 250 GH; ASTM A 105 / ASTM A 668 Class F / ASTM A 516 Gr. 60)

Characteristic properties: The special feature of this stainless steel is that it can be used in temperatures of up to 480 °C.

Advantages of forged steel

  • heat resistant
  • good weldability

Disadvantage of forged steel

  • Tempering required

Areas of application: This forged steel is primarily used for flanges, in constructional steelwork, for gas-turbine blades and for pressure vessels as well as in valve manufacturing / power plants for forged valves.

Welded steel (S 235 JR G 2 / S 235 JR + AR; ASTM A 283 Gr. C)

Characteristic properties: This steel is used for constructional steel work as it is particularly suitable for welding and exhibits good fracture toughness.

Advantage of Welded steel 

  • high breaking strength

Areas of application: Mainly in constructional steelwork and in the manufacture of welded valves.

H II (P 265 GH; ASTM A 516 Gr. 60)

Characteristic properties: This kind of steel is very heat resistant.

Advantage of H II

  • very durable, e.g. due to heat insulation layers

Areas of application: This steel is frequently used for gas-turbine blades as well as for pressure vessels. It is also used for the manufacture of welded valves.

Stainless steel

1.4308 (ASTM A 351 Gr. CF 8)

Characteristic properties: This steel consists of a chromium-nickel alloy.

Advantages of 1.4308

  • good corrosion resistance
  • can be given mirror finish

Areas of application: This stainless steel is mainly used in the food-, beverage- and packaging industries, for valves exposed to aggressive media or environments, in pumps and mixers.

1.4462 (ASTM A 182 Gr. F 51)

Characteristic properties: This stainless steel belongs to the group of duplex steels and its micro-structure consists of a mixture of austenitic and ferritic crystal grains.

Advantages of 1.4462

  • high corrosion resistance
  • excellent strength

Areas of application: This stainless steel is frequently used in the construction-, oil-, food- and chemical industries and also for electronic equipment, in machine- and shipbuilding and off-shore applications; it is also used for the manufacture of valves installed in aggressive media or sea water.

1.4571 (ASTM A 182 Gr. 316 Ti)

Characteristic properties: This type of stainless steel is an austenitic steel.

Advantages of 1.4571

  • good weldability, does not need to be tempered
  • very high corrosion resistance

Areas of application: The areas of application of this stainless steel primarily include the manufacture of chemical equipment, nuclear power applications, vacuum technology, submarine and furnace construction and the manufacture of welded valves suitable for use in aggressive media.

1.4408 (ASTM A 351 - CF 8 M)

Characteristic properties: This stainless steel is a cast version of chromium-nickel-molybdenum steels.

Advantage of 1.4408

  • excellent oxidation resistance

Areas of application: This stainless steel is primarily used for pumps, valves and machine parts exposed to aggressive media and also in the chemical industry.

References

Special valves

You have a project where you are at a loss and need the help of experienced engineers and technical designers? Then please do not hesitate to contact us and we’ll come up with a solution tailored to your individual needs. That something has not been done before does not mean we’re unable to do it or would not like to realise it together with you.  

Here you can find a small selection of special valves realised successfully by VAG in the past few years.

VAG EKN® Butterfly Valve DN 800, made of type 1.0038 welded steel, with rubber lining, with base plate as anchor-point valve and equipped with a hydraulic brake-and-lift unit

VAG RIKO® Plunger Valve DN 250 made of cast stainless steel type 1.4408

VAG EKN® Butterfly Valves MT/MT-G made of type 1.0038 welded steel with UVV-safety interlock and welding ends

You can read more about other special valves here in our brochure.