Heat Treating Services


RISS has been providing Heat Treating services to clients in Saudi Arabia and Middle East since 2009.


With stringent adherence to ISO Quality Management System standards, RISS has gained the reputation as a reliable contractor of Heat Treating. An exceptional, experienced and motivated team provides a variety of services including the treatment of: weld joints, piping, regenerators, stripper columns, pressure vessels, boiler headers, modules, deck pipelines and structures and boiler heater tubes.


Sources of residual stresses: Welding, Casting, Forging, Rolling, Forming, Drawing, Hammering, Bending, Shearing, Machining


What heat treating does:

  • Relieves stresses

  • Removes cold work

  • Improves dimensional stability

  • Increases corrosion resistance

  • Improves toughness

  • Improves ductility


Equipment specs:

  • 70kVA – 3 phase double wound class H

  • 380/415 V

  • 106 Amps

  • 6 chancels/unit


The recorder specs:

  • Multiple numbering stamping from # 1 to 12 temperature every 2 hrs.


Post Weld Heat Treating (PWHT)‎


In PWHT, steel is heated to a temperature below or close to the lower critical temperature with a specific rate of heating. It is held at the temperature for a desired length of time, followed by cooling with a specific rate up to a certain temperature. It tempers the metal and reduces the tensile stress, minimizing the risk of brittle fractures. There is no change in grain structure.


Weld Preheating and Concurrent Heating

  • It drives off the moisture that would release hydrogen that could penetrate the weld and cause porosity and subsequent cracking.

  • It reduces heat loss to the surrounding metal minimizing the rate of weld hardening and allowing hydrogen that is present to escape.

  • It improves the microstructure and durability of the heat-affected zone.



Normalizing is the treatment of steel by heating it above the transformation temperature, holding for a certain time, and then cooling it to room temperature in still or slightly agitated air. This is done to remove the processing stress and provide a more uniform structure.

Solution Annealing


Austenitic stainless steels are heated to above 1050°C and held for the desired time followed by cooling to room temperature within few minutes by quenching/blowing the air.‎


Hydrogen De-Gassing

This de-gassing process helps to improve the integrity of the welded components whilst also reducing the possibility of cracking from fabrication. Hydrogen de-gassing occurs before the welding/cutting of older process equipment, protecting it during the cutting and welding phases.‎

Positive Paint Curing


Curing coatings and resistance furnaces are used in the finishing industry for baking vitreous enamel coatings onto metal substrates and for drying and curing organic coatings, such as paints and varnishes, on a variety of materials.‎

Material Decontamination


The huge storage tanks that once held toxic agents may be decontaminated by using electrical resistance heating. This heating process drives residual chemical agents out of the tank wall, so they can be collected and the tank can be dismantled.

Dry Out Refractory


A method used to remove both free and chemically held water, to minimize spilling, cracking and extend the refractory life.