Alloy Steel Reheater Tube Bundle High Temperature Reheat Service 12Cr1MoVG T91

Alloy Steel Reheater Tube Bundle for High-Temperature Reheat Service with 12Cr1MoVG/T91 Materials

The Alloy Steel Reheater Tube Bundle is a high-temperature reheat steam heating component fabricated by Boyu Heavy Industry, specifically designed for the high-temperature sections of reheater systems in utility and large industrial boilers. As an ASME S/U certified boiler component manufacturer with specialized alloy steel fabrication capabilities, Boyu produces reheater tube bundles using creep-resistant alloy steel materials (12Cr1MoVG and T91) that provide reliable long-term service at reheat steam temperatures up to 571C. This tube bundle serves the primary function of heating reheat steam to its final design temperature in the high-temperature convective or radiant section, where carbon steel and low-alloy materials cannot provide adequate creep resistance.

The Alloy Steel Reheater Tube Bundle is specifically constructed with high-temperature alloy steel seamless tubes arranged in serpentine or vertical panel configurations. Boyu fabricates bundles from 12Cr1MoVG (SA-213 T11/T22) for 520-565C service and T91 (SA-213 T91) for up to 593C service. These materials provide excellent creep strength, oxidation resistance and microstructural stability at high temperatures, which are essential for reheater service where tube metal temperatures can exceed steam temperature by 20-50C due to heat flux. The reheat steam pressure is 1.2-3.8MPa, allowing tube walls of 4-6mm (thinner than equivalent superheater tubes), which reduces thermal stress and improves heat transfer. Standard tube sizes are 42-63.5mm OD. CNC precision bending ensures ovality <8%.

Manufactured using certified alloy steel tubes with CNC bending, robotic welding, post-weld heat treatment and comprehensive NDT, every Alloy Steel Reheater Tube Bundle undergoes 100% RT for weld joints, bend inspection, dimensional verification, hardness testing (for PWHT verification) and 1.5x design pressure hydraulic test. The ASME S/U certified fabrication ensures compliance with international pressure vessel standards. Boyu's specialized alloy steel fabrication capability includes proper welding procedure qualification (WPS/PQR) for each alloy grade and mandatory PWHT to prevent reheat cracking. Typical delivery is 30-45 days. Full documentation including MTC, WPS/PQR, PWHT reports, hardness records and NDT reports accompanies every shipment.

One significant advantage of Boyu Alloy Steel Reheater Tube Bundles is the specialized alloy steel fabrication expertise that ensures reliable high-temperature performance. Alloy steel welding requires precise control of preheat temperature, interpass temperature and post-weld heat treatment to prevent cracking and ensure proper mechanical properties. Boyu's qualified welding procedures and systematic quality control ensure every alloy weld meets ASME standards. Additionally, the systematic material selection (12Cr1MoVG for standard 540C service, T91 for advanced 565-571C service) ensures appropriate creep resistance for each design condition, avoiding both under-design (premature failure) and over-design (unnecessary cost).

The Alloy Steel Reheater Tube Bundle is adaptable to various utility and large industrial boiler types, making it suitable for power generation, coking waste heat and large industrial steam applications. Its versatility enables fabrication for high-temperature reheater sections across boiler capacities from 300MW to 1000MW and above, with reheat steam parameters from 2.4MPa/480C inlet to 3.8MPa/571C outlet. Furthermore, bundles can be customized for specific tube sizes, bend configurations, material grades and transition joints (alloy-to-carbon steel), ensuring optimal performance for each boiler's high-temperature reheat requirements.

In addition to functional benefits, the Alloy Steel Reheater Tube Bundle is designed with safety and long-term reliability in mind. All alloy steel materials and fabrication comply with ASME BPVC Section I and GB/T 16507 standards. Boyu provides technical support for material grade selection, creep life assessment, welding procedure qualification, failure analysis and maintenance planning, helping clients achieve optimal high-temperature reheater performance and service life. Proper alloy steel reheater design ensures stable reheat steam temperature and prevents creep-related tube failures.

To summarize, the Boyu Alloy Steel Reheater Tube Bundle represents a specialized high-temperature reheat heating solution leveraging our ASME S/U alloy steel fabrication expertise. By delivering creep-resistant alloy steel bundles with qualified welding procedures, verified PWHT and comprehensive NDT, it ensures reliable service at reheat steam temperatures up to 571C. Our specialized alloy fabrication capability, rigorous quality control and expert technical support make this product an ideal choice for large boiler manufacturers and EPC contractors requiring high-performance reheater components.

Features

·        Creep-resistant alloy: 12Cr1MoVG(T11/T22) 520-565C / T91 up to 593C

·        ASME S/U certified, qualified WPS/PQR for each alloy grade

·        Reheat pressure 1.2-3.8MPa, tube walls 4-6mm (thinner than superheater)

·        CNC precision bending, ovality <8%, tube OD 42-63.5mm

·        100% RT welds + bend inspection + hardness test + 1.5x hydraulic

·        Mandatory PWHT with hardness verification to prevent reheat cracking

·        Tube metal temp can exceed steam temp by 20-50C due to heat flux

·        Suitable for 300MW to 1000MW+ utility boilers

·        Steam: 2.4MPa/480C inlet to 3.8MPa/571C outlet

·        Delivery: 30-45 days, full documentation with traceability

Technical Parameters

Applications

The Boyu Alloy Steel Reheater Tube Bundle is a high-temperature reheat steam heating component for utility and large industrial boilers. Manufactured in Shandong, China under ASME S/U certification with creep-resistant alloy steel, this bundle provides reliable service at reheat steam temperatures up to 571C. Certified with ISO9001, ASME S/U, Grade A, SGS and IBR, the product guarantees high quality and reliable high-temperature performance.

This Alloy Steel Reheater Tube Bundle is widely used in large utility boilers (300MW to 1000MW+), coking waste heat boilers and large industrial boilers with high-temperature reheat cycles. Its 12Cr1MoVG/T91 construction and qualified welding procedures ensure reliable creep resistance and long service life in the most demanding reheat applications.