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Creep-resistant steels are essential materials in power generation, oil and gas processing, and petrochemical refining — any application where metals must perform reliably under sustained elevated temperatures for years or decades. Unlike standard structural steels, which are designed primarily for ambient-temperature mechanical performance, creep-resistant steels are engineered to resist the slow, time-dependent deformation that occurs when metals are loaded at high temperatures over extended periods.
Welding these materials correctly is one of the most demanding challenges in industrial fabrication. The same alloying elements that give creep-resistant steels their high-temperature strength also make them susceptible to specific and serious cracking mechanisms during and after welding. This guide covers the metallurgical background, the two primary cracking risks, welding procedure requirements, and ESAB's filler metal recommendations for the most commonly encountered creep-resistant steel grades.
Creep is the permanent, time-dependent deformation of a material under sustained load at elevated temperature — typically above approximately 30–40% of the material's melting point. For steels used in boilers, pressure vessels, and pipework operating at 450–650°C, creep resistance is a fundamental design requirement.
Creep-resistant steels are ferritic steels strengthened by the controlled addition of alloying elements that form stable carbides and nitrides at grain boundaries, resisting the dislocation movement that causes creep. The principal alloying elements and their roles are:
Common creep-resistant steel grades encountered in welding include:
Cold cracking — also known as hydrogen-induced cracking (HIC) or delayed cracking — typically occurs within 24–48 hours of welding, predominantly in the heat-affected zone (HAZ). It is caused by the combination of three factors, all of which must be present simultaneously:
Eliminating or minimising any one of these three factors reduces the risk of cold cracking. In practice, this means preheating (to slow cooling and reduce martensite formation), using low-hydrogen consumables, and maintaining hydrogen control throughout the welding operation. For guidance on hydrogen and moisture control in flux-dependent processes, see our article on managing welding fluxes and WPS and PQR procedure management.
Reheat cracking — also known as stress-relief cracking or SR cracking — occurs in the HAZ during post-weld heat treatment (PWHT) or elevated temperature service, typically in the temperature range of 450–700°C. It is caused by the precipitation of carbides within grains during reheating, which strengthens the grain interiors but leaves grain boundaries relatively weak. The residual stresses relaxing during PWHT are then concentrated at grain boundaries, causing intergranular cracking.
The risk is highest in steels containing vanadium, niobium, and titanium — the same elements that provide the best creep resistance. This creates a fundamental trade-off in advanced grades like P91 and P92 that must be managed through careful procedure development.
Mitigation measures include:
Preheating is essential for virtually all creep-resistant alloy grades. It slows the cooling rate through the martensite transformation range, reduces the hardness of the HAZ martensite, and allows hydrogen to diffuse out of the weld zone before cracking can occur.
Recommended preheat temperatures depend on the specific grade, section thickness, restraint level, and hydrogen potential of the consumables being used. The IIW carbon equivalent (CE) method used for structural steels is not applicable to CrMo alloys. Specific guidance must come from the applicable material specification, the consumable manufacturer's data, or the welding procedure specification. Typical ranges are:
Always consult the WPS or the material specification — preheat requirements for P91 in particular are strictly controlled and must not be estimated.
PWHT is mandatory for all CrMo and advanced CrMoV grades in structural and pressure-containing applications. Its purposes are to temper the martensitic HAZ (reducing hardness and improving toughness), relieve residual welding stresses, and restore some of the creep strength properties in the weld metal that are lost during welding.
PWHT temperatures and hold times are grade-specific and code-dependent. For P22 (2.25Cr-1Mo), typical PWHT is 690–750°C for a minimum of 1 hour per 25 mm of thickness. For P91 (9Cr-1Mo-V), PWHT must be performed at 730–800°C with strict hold time requirements — and the cooling rate from PWHT must be controlled to avoid re-entering the martensite transformation range too quickly.
All consumables used for CrMo and advanced alloy welding should be specified to the lowest available hydrogen designation — H5 or better where possible. ESAB's VacPac™ electrode packaging hermetically seals low-alloy stick electrodes under vacuum, guaranteeing factory-fresh moisture content and eliminating the need for rebaking when the seal is intact. For flux-dependent processes, see our flux baking guide.
ESAB offers a comprehensive range of filler metals covering all common creep-resistant steel grades across stick (SMAW), TIG (GTAW), MIG (GMAW), and submerged arc (SAW) processes.
ESAB's complete range of CrMo filler metals — including B2, B3, and B9 (P91) grades across SMAW, GTAW, GMAW, and SAW processes — is detailed in our comprehensive filler metals range. For the full technical data including preheat requirements, PWHT guidance, and mechanical properties by grade, download the ESAB Welding Guide: Creep Resistant Steels from your local ESAB representative or contact our applications team.