{"id":8261,"date":"2026-06-10T17:21:36","date_gmt":"2026-06-10T15:21:36","guid":{"rendered":"https:\/\/gbcspa.com\/?p=8261"},"modified":"2026-06-20T17:51:51","modified_gmt":"2026-06-20T15:51:51","slug":"pipe-cutting-beveling-thermal-power-plants-steam","status":"publish","type":"post","link":"https:\/\/gbcspa.com\/en\/pipe-cutting-beveling-thermal-power-plants-steam\/","title":{"rendered":"Pipe cutting and beveling in thermal power plants and steam plants: challenges and solutions"},"content":{"rendered":"<p><em>Thermal power plants and industrial steam plants use creep-resistant alloy steel pipes (P22, P91, P92, austenitic stainless steels) that require cold mechanical cutting and chamfering to comply with ASME B31.1 welding specifications and ASME BPVC Section IX qualified procedures. Thermal break is excluded or subject to strict preheating and post-heating procedures for these materials. Portable cutting and beveling machines allow these operations to be carried out in the field, on already installed pipes or on site, without altering the metallurgy of the base material.<\/em><\/p>\n<h2><strong>The background: pipes and materials in thermal power plants<\/strong><\/h2>\n<p>In thermoelectric power plants, the network of pipes crossed by high-pressure and high-temperature steam is among the most critical components of the plant. Live steam pipes (those that connect the steam generator to the turbines) work in the most severe operating conditions, ranging from <a href=\"https:\/\/www.mdpi.com\/1996-1073\/13\/21\/5592\" target=\"_blank\" rel=\"noopener\">165 bar (540\u00b0C)<\/a> for subcritical plants, up to over 300 bar (30 MPa) and 600-620\u00b0C for <a href=\"https:\/\/globalenergyprize.org\/en\/2023\/06\/01\/power-plants-with-high-efficiency-to-provide-two-thirds-of-new-capacities-in-coal-fired-power-generation\/\" target=\"_blank\" rel=\"noopener\">ultra-supercritical<\/a> (USC) systems, with experimental peaks <a href=\"https:\/\/www.mdpi.com\/2071-1050\/13\/2\/801\" target=\"_blank\" rel=\"noopener\">close to 700\u00b0C<\/a>.<\/p>\n<p>These extreme parameters require materials with a high creep resistance, which is essential to ensure structural integrity throughout the plant&#8217;s estimated <a href=\"https:\/\/www.researchgate.net\/publication\/272272702_Creep_Life_Prediction_of_9Cr-1Mo_Ferritic_Steel_with_Larson-Miller_and_Manson-Haferd_Parameter\" target=\"_blank\" rel=\"noopener\">100,000 to 200,000 operating hours.<\/a><\/p>\n<h2><strong>Popular materials<\/strong><\/h2>\n<p>Creep-resistant ferritic-martensitic steels <a href=\"https:\/\/www.phase-trans.msm.cam.ac.uk\/2005\/LINK\/146.pdf\" target=\"_blank\" rel=\"noopener\">are the dominant choice<\/a> for live steam and resuperheat piping in steam plants:<\/p>\n<ul>\n<li><strong>P22 (2,25Cr-1Mo, ASTM A335 Gr. P22):<\/strong> historical steel, in service for decades, suitable for wall temperatures typically up to 565-590\u00b0C depending on the design and creep margins. Still present in numerous existing plants all over the world. It requires preheating before welding to prevent hydrogen cracking (qualified WPS defines the exact value) and post-weld heat treatment (PWHT) by stress relieving.<\/li>\n<li><strong>P91 (9Cr-1Mo-V, ASTM A335 Gr. P91):<\/strong> introduced in the 80s, it allows to reduce thicknesses at the same pressure thanks to its superior mechanical resistance. Suitable for continuous use up to approx. 600-650\u00b0C. Above this threshold, the choice generally falls on the P92.<\/li>\n<li><strong>P92 (9Cr-2W-Mo-V-Nb, ASTM A335 Gr. P92):<\/strong> evolution of P91, with the addition of tungsten which increases creep resistance. Used in ultra-supercritical systems that operate stably above 600\u00b0C. Very sensitive to the soldering procedure and PWHT.<\/li>\n<li><strong>Austenitic stainless steels (TP304H, TP316H, TP347H):<\/strong> mainly used in heat exchangers, superheaters and boiler tubes that work at maximum temperature. They resist creep up to higher temperatures than ferritics, but have a higher coefficient of thermal expansion and a higher cost.<\/li>\n<li><strong>P11 (1.25Cr-0.5Mo) and P5 (5Cr-0.5Mo):<\/strong> present in lines at intermediate temperatures and pressures.<\/li>\n<\/ul>\n<h2><strong>The challenges of cutting and beveling in the industry <\/strong><\/h2>\n<h3><strong>Metallurgy sensitive to thermal variations<\/strong><\/h3>\n<p>P91 and P92 are the most critical materials in this respect. The martensitic structure (the one that gives creep resistance) is the result of a precise thermal cycle of normalization and tempering. Any uncontrolled heat input into the cutting zone can locally alter this structure, producing areas of low hardness or, in the case of rapid cooling, fragile areas. Cutting with plasma, oxyacetylene flame or laser can only be allowed with rigid procedures that involve preheating; In most specifications, however, it requires subsequent mechanical processing to remove the heat-affected layer.<\/p>\n<p>Mechanical cold cutting with a tungsten carbide tool is the preferred method in the power plant specifications: it removes the material without introducing heat into the adjacent area and without altering the metallurgical structure of the pipe.<\/p>\n<h3><strong>High thicknesses and tight tolerances<\/strong><\/h3>\n<p>Live steam pipes in large power plants typically have diameters between DN100 and DN500 (about 4&#8243;-20&#8243;), with some cases reaching DN800 (32&#8243;) in main lines. Wall thicknesses in high-pressure circuits (25-35 MPa) are generally between 30-50 mm, exceeding 50-60 mm in critical areas. Cutting a pipe of such size within a tight tolerance requires the cutting motion to be mechanically guided. In GBC cold cutting and chamfering machines, the tool rotates around the tube and advances incrementally, ensuring precision and stability.<\/p>\n<h3><strong>Accessibility in the field<\/strong><\/h3>\n<p>The scheduled maintenance and urgent repair of a thermoelectric power plant take place on pipes that are already installed, often in confined spaces, with scaffolding, insulation to be removed and access constraints. Field cutting and beveling machines must be mountable on the pipe in situ, light enough to be positioned manually or with lifting equipment, and capable of operating in complex positions.<\/p>\n<h3><strong>Regulatory requirements for metal chamfering<\/strong><\/h3>\n<p><a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/b31-1-power-piping\" target=\"_blank\" rel=\"noopener\">The ASME B31.1<\/a> (Power Piping) code is the dominant regulatory reference for steam plant piping in the United States and many other countries. For butt welds, B31.1 requires that the edges be prepared according to a Welding Procedure Specification (WPS) qualified under ASME BPVC Section IX. The standard does not prescribe a specific bevel angle: it refers to the qualified WPS, which in turn is based on a PQR (Procedure Qualification Record) with mechanical tests. In jobsite practice, the 37.5\u00b0 angle (with a total opening of 75\u00b0 for single V joints) is the prevailing industry standard in WPS for P91, P22 and austenitic steels, in accordance with general recommendations for flap preparation. Other common designs include compound bevel (e.g. 10\u00b0+30\u00b0 or 15\u00b0+37.5\u00b0) and, for high thicknesses, narrow-gap weld prep.<\/p>\n<p>An out-of-tolerance angle, excessive eccentricity or a cut zone with altered hardness compromise the quality of the weld and the passing of the non-destructive tests (RT, UT phased array) that are standard for all critical joints in steam power plants. <a href=\"https:\/\/gbcspa.com\/en\/weld-joint-preparation-asme-b31\/\"><u>Read the article dedicated to ASME standards. <\/u><\/a><\/p>\n<h2><strong>Mechanical solutions: cutting and beveling in the field<\/strong><\/h2>\n<p>For power plant pipes made of P91, P92 and austenitic steels, the thermal break is excluded or subject to rigid preheating procedures. The reference solution is cold mechanical cutting and beveling with tungsten carbide inserts: the tool rotates around the circumference of the tube without introducing heat into the work area, preserving the metallurgical structure of the base material.<\/p>\n<h3><strong>GBC&#8217;s FAST and Supercutter: cutting and chamfering on the same machine<\/strong><\/h3>\n<p>The <a href=\"https:\/\/gbcspa.com\/en\/product\/fast\/\">FAST<\/a> and the <a href=\"https:\/\/gbcspa.com\/en\/product\/supercutter\/\">Supercutter<\/a> machines perform cutting and chamfering on the same machine, with dedicated tools for edge preparation. Both cover the \u00d8e 6&#8243;-60&#8243; range and are available not only in hydraulic, electric and brushless versions, but also in pneumatic versions &#8211; for power plant construction sites where compressed air is often the only energy source available.<\/p>\n<p>The difference between the two types is relevant during the selection phase for field installation:<\/p>\n<p><strong>FAST<\/strong> <em>(split frame):<\/em> it is completely divided into two separate halves that close around the tube. The self-centering device &#8211; a unique feature in the GBC range &#8211; ensures automatic alignment on the axis even in difficult access conditions. It offers a wide range of standard and combination cutting and beveling tools. The <a href=\"https:\/\/gbcspa.com\/en\/product\/fast\/\">FAST<\/a> machines and the <a href=\"https:\/\/gbcspa.com\/en\/product\/supercutter\/\">Supercutter<\/a> perform cutting and beveling on the same machine, with dedicated tools for edge preparation. Both cover the \u00d8e 6&#8243;-60&#8243; range and are available not only in hydraulic, electric and brushless versions, but also in pneumatic versions &#8211; for power plant construction sites where compressed air is often the only energy source available.<\/p>\n<p><strong>Supercutter<\/strong> <em>(clamshell): <\/em>it is hinged on one side and opens like a shell without separating into two pieces. It has two tool holders with an external diameter profile copying system, which eliminates chamfer variations between one pass and another. It has no limits on the thicknesses that can be machined thanks to the possibility of producing custom-made tools.<\/p>\n<p>Both machines are mounted directly on the pipe already in place, without access from the end and without disassembling the adjacent supports.<\/p>\n<h3><strong>HYPERMAXI: dedicated pipe cutter for large diameters<\/strong><\/h3>\n<p>When the preparation of the flap requires multiple operations in sequence on the same end &#8211; turning, internal and external taper, chamfering with complex geometries &#8211; GBC has the <a href=\"https:\/\/gbcspa.com\/en\/product\/hypermaxi-20_40\/\">HYPERMAXI.<\/a> The machine works on internal diameters from 508 to 937 mm (20&#8243;-36&#8243;), with extension kits up to 1016 mm OD (40&#8243;), in carbon, stainless, duplex and Inconel steels. It is available in pneumatic, hydraulic and brushless versions, with automatic feed in the hydraulic version.<\/p>\n<p>The HYPERMAXI is the ideal solution for applications where the welding specification requires chamfer profiles that go beyond the standard V-prep: J-prep, compound bevel, internal taper for the root pass.<\/p>\n<h2><strong>Preheating management before residual thermal break<\/strong><\/h2>\n<p>Although mechanical cold cutting is the first choice for P91 and P92, there are situations (partial demolitions, detachment of large members) where thermal cutting is performed as a preliminary operation, followed by mechanical rework. In this case, the <a href=\"https:\/\/www.epri.com\/research\/products\/000000003002010839\" target=\"_blank\" rel=\"noopener\">EPRI<\/a> (Electric Power Research Institute) specifications and the WPS of the power plants provide:<\/p>\n<ul>\n<li>Preheating of the P91 prior to thermal break, to the minimum temperature prescribed by the qualified WPS (typically in the range of 150-200\u00b0C according to EPRI guidelines for thermal break, higher for welding)<\/li>\n<li>Mechanical cold removal of <strong>at least 3 <\/strong>mm (or according to the specifications of the WPS of the project) to completely eliminate the surface Thermally Affected Zone (HAZ \/ HAZ) and avoid initiation of cold cracks.<\/li>\n<li>Checking the hardness of the final surface before welding<\/li>\n<\/ul>\n<p>Mechanical <a href=\"https:\/\/gbcspa.com\/en\/product-category\/pipe-bevelers\/\"><strong>pipe cold beveling machines<\/strong><\/a> are used sequentially after thermal break to ensure the quality of the joint surface.<\/p>\n<h2><strong>Austenitic stainless steels: specific considerations<\/strong><\/h2>\n<p>TP304H, TP316H and TP347H pipes in steam plants pose different challenges than ferritics. Their hardness is lower than that of P91, but they have:<\/p>\n<ul>\n<li><strong>High tendency to work harden:<\/strong> similar to duplex, but less pronounced. The insert must have positive rake angle geometry to reduce cutting forces and limit surface work.<\/li>\n<li><strong>Risk of sensitization:<\/strong> If the temperature in the cutting zone exceeds the range of 450-850\u00b0C with sufficient residence time, chromium carbide precipitates at the grain boundaries, depleting the adjacent zone of chromium and making it sensitive to intergranular corrosion. Thermal break can cause sensitization if the material is an unstabilized grade H (high carbon); <strong>Mechanical cold cutting does not pose this risk.<\/strong><\/li>\n<li><strong>No preheating required for soldering:<\/strong> unlike P91, austenitics solder at room temperature, but require control of the interpass temperature.<strong>\u00a0<\/strong><\/li>\n<\/ul>\n<h2><strong>Cut quality and welding preparation<\/strong><\/h2>\n<p>Regardless of the material, the preparation of the flap for welding in steam power plants must comply with stringent criteria:<\/p>\n<ul>\n<li><strong>Squaring of the cut:<\/strong> deviation from perpendicular to the axis of the pipe less than 0.5-1 mm according to typical WPS.<\/li>\n<li><strong>Surface finish:<\/strong> the roughness values (Ra) obtained with cold cutting prevent the triggering of defects or porosity, ensuring a perfect geometric coupling for the delicate execution of the root pass. For mechanical cutting with carbide inserts, the finish is usually sufficient without additional rework.<\/li>\n<li><strong>Absence of heat-affected zone:<\/strong> required for P91 and P92. Mechanical cutting satisfies it by definition.<\/li>\n<li><strong>Dimensional control of the chamfer:<\/strong> the angle, the length of the facing (land) and the eccentricity tolerance must be within the requirements of the qualified WPS.<\/li>\n<\/ul>\n<p>Many power plant specifications include a visual and dimensional inspection of the chamfer prior to welding (in some cases followed by a liquid penetrant (PT) or magnetic particle (MT) check for P91) as part of the plant&#8217;s quality process.<\/p>\n<h2><strong>How GBC supports operations in thermal power plants<\/strong><\/h2>\n<p>GBC has been manufacturing <strong>cold pipe cutters and pipe bevelers<\/strong> for boiler pipes and steam plants for over forty years. The range covers the typical diameters of the thermoelectric sector: from 10 mm pipes of vaporization panels to large diameters of manifolds and live steam pipes.<\/p>\n<p>For field operations (scheduled maintenance, overhaul stops, urgent repairs) GBC supplies compact pipe beveling machines, powered by electricity or compressed air, capable of working on internal and external diameters of various sizes and creating chamfers of various geometries.<\/p>\n<p><a href=\"https:\/\/gbcspa.com\/en\/contacts\/\"><strong>GBC technical support<\/strong><\/a> is available for the selection of the machine and tool according to the material (P22, P91, P92, austenitic), diameter, wall thickness and the requirements of the reference WPS.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thermal power plants and industrial steam plants use creep-resistant alloy steel pipes (P22, P91, P92, austenitic stainless steels) that require cold mechanical cutting and chamfering to comply with ASME B31.1 welding specifications and ASME BPVC Section IX qualified procedures. Thermal break is excluded or subject to strict preheating and post-heating procedures for these materials. Portable&#8230;  <a href=\"https:\/\/gbcspa.com\/en\/pipe-cutting-beveling-thermal-power-plants-steam\/\" class=\"more-link\" title=\"Read Pipe cutting and beveling in thermal power plants and steam plants: challenges and solutions\">Read More &raquo;<\/a><\/p>\n","protected":false},"author":3,"featured_media":8265,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[54],"tags":[],"class_list":["post-8261","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pipe cutting and beveling in thermal power plants | GBC Guide<\/title>\n<meta name=\"description\" content=\"How to avoid metallurgical alteration (HAZ) in the cutting and beveling of pipes for thermoelectric power plants. 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