Water-glass Casting for Oil and Gas Components

- Water - glass: The water - glass with appropriate modulus and density is used. The binding properties are affected by the modulus and fluidity as well as coating thickness is affected by fluidity as well as by density. In case of additives in oil as well as gas, water - glass having a modulus between 2.2 - 2.8 is generally adopted because it provides good workability as well as toughness.

Ibgħat l-inkjesta

Deskrizzjoni

- Base Metal:

- Pattern making: The gas as well as the oil parts are made in 3D with great precision with the assistance of CAD software. The highly shaped details in the final product are duplicated with great precision.

- Pattern Materials:

- Coating application: The design from polystyrene or from wax is soaked in a water-glass paste that is a combination between water with a refractory material - The coating is deposited in a sequence with particles with a variety in each - The coats at beginning have particles that are smaller in a move towards attaining a surface finish that is not as rough, with coarser particles in succeeding coats.

- Drying:

- Pattern Ejection: The pattern is forced out from drying as also from becoming hardened. In a pattern cast in wax, it is obtained by heating the mould shell in a device having a source of steam or in a high-pressure autoclave that melts out the wax.

- Metal Melting: The raw metal is melted in a furnace at suitable heat. Carbon steel, for example, is melted at 1500 - 1600 degree . There is rigorous heat maintenance in a manner that the metal is in suitable fluidity as well as having suitable ratios of chemicals.

- Pouring: The metal is cast in a pre - heated mould shell in a directed manner. Gravity pouring or methods of low - pressure pouring can be made as a function of component complexity as well as component size.

Post - casting Treatment

- Shell stripping:

- Heat Treatment: The heat - treated castings in order to enhance their mechanical properties, i. e., toughness, hardness, and strength. Some common heat - treatments are annealing, quenching, and tempering.

- Machining And Finishing: Final dimensions as also surface finishes are machined in castings as in case of application of gas as also application of oil. The work can be turning, as also can be milling. The non - destructive ultrasonic examination as also magnetic particle examination are also carried out in order to inspect whether internal flaws are present.

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