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Chemical processing plants operate under extreme conditions that push metals to their limits. High temperatures, corrosive media, and continuous cycling create conditions that demand more than standard fabrication. Heat treatment services are critical in chemical processing environments to ensure material integrity, reduce residual stresses, and prevent premature failure in service.
In chemical processing plants, metal components are subjected to residual weld stresses, hydrogen embrittlement, and material fatigue. Without proper heat treatment, such stress can lead to cracking, brittle fracture, or premature failure at the worst possible moment.
Heat treatment for chemical processing plants addresses these risks by altering the microstructure of metals in a controlled way. The right thermal cycle is engineered to the specific alloy, geometry, and operating environment.
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Chemical processing facilities rely on a range of heat treatment services throughout new constructions, turnarounds, and ongoing maintenance.
Axiom HT specializes in the following:
| Post Weld Heat Treatment (PWHT) PWHT is a widely specified and controlled heat treatment process applied after welding.Reduces the hardness and residual stresses introduced during welding.Learn More | Hydrogen Bake Out Hydrogen bake-out promotes diffusion of absorbed hydrogen out of the weld and heat-affected zone before it can cause cracking.Especially critical for in-service components being returned to service after maintenance.Learn More |
| Preheat Preheating the base metal before welding reduces the temperature differential between the weld and the surrounding metal.Dramatically lowers the risk of hydrogen cracking and distortion.Learn More | Thermal Stabilizing Thermal stabilizing relieves internal stresses and improves dimensional stability in fabricated components.Helps maintain integrity under thermal cycling and long-term plant operating conditions. Learn More |
| Solution Annealing Materials used in corrosive chemical service are susceptible to sensitization, a condition where chromium carbides precipitate at grain boundaries, leaving the metal vulnerable to intergranular corrosion.Produces a homogeneous austenitic microstructure and helps recover corrosion resistance by dissolving chromium carbide precipitates. Learn More | Refractory Dry OutChemical plant furnaces, heaters, and reactors are often lined with refractory materials that must be gradually dried and cured before the unit is brought to operating temperature.Prevents thermal shock damage and extends refractory service life from day one.Learn More |
| Line Thaw Line thawing is used in chemical processing plants to clear frozen process piping and instrumentation lines.Ensures uninterrupted flow of steam, water, hydrocarbons, and utility fluids when low temperatures cause solidification or blockages.Learn More | Phenolic Coating Cure Phenolic coating cure is a controlled heating process that fully hardens internal tank and piping coatings.Ensures maximum chemical resistance, adhesion, and long-term corrosion protection.Learn More |
No single heating method fits every application.
Axiom HT deploys multiple approaches, selecting and combining them based on component geometry, alloy requirements, and site constraints:
| Electrical Resistance Heating | Low-voltage flexible ceramic heating elements provide precise, controllable heat for piping, flanges, and complex geometries. This is the most widely used method for PWHT and preheat in chemical plant turnarounds. |
| Combustion Heating | For large structures such as furnace shells, process vessels, or refractory-lined equipment, high-velocity combustion burners deliver uniform heat across large surface areas with excellent efficiency. |
| Induction Heating | High-frequency induction coils provide rapid, targeted heating for high-production applications. Ideal for repetitive preheat operations or localized repairs where speed and precision are essential. |
| Axi-Therm Blended Heating & Cooling | Axiom’s Axi-Therm blended heating and cooling methodology integrates radiant, conduction, and convection heating techniques with controlled cryogenic cooling to improve heat distribution, reduce required energy input, and shorten cooling and turnaround times, helping operators return equipment to service faster. |
Heat treatment in chemical processing is a contractual and regulatory requirement.
Projects are governed by ASME B31.3 (Process Piping), ASME Section VIII (Pressure Vessels), API 510, API 570, and client-specific welding procedures and quality plans.
Every heat treatment cycle performed by Axiom HT is documented with:
Chemical plant turnarounds operate on compressed schedules where every hour of delay carries direct cost.
Axiom HT specializes in onsite heat treatment that works within these constraints — mobilizing rapidly, setting up efficiently, and running heat treatment operations concurrent with other mechanical activities where safe to do so.
Axiom HT has supported energy, chemical, and refining clients across the United States with onsite heat treatment services since the 1920s. Our engineering-led approach means every project begins with a thermal analysis, not a generic procedure pulled from a library.
