SGHT Powder Metallurgy FeCrAl Thick Heating Wire (φ1.0–8.5 mm）

Available in diameters from 1.0 mm to 8.5 mm, SGHT powder metallurgy ultra-high temperature FeCrAl thick heating wire is manufactured in strict compliance with the GB/T 1234-2012 national standard, with a maximum element operating temperature of 1420°C. Produced via advanced powder metallurgy technology, it delivers outstanding high-temperature creep resistance, oxidation stability and anti-sagging performance, along with excellent winding formability. It is ideal for high-end industrial heating applications including ceramic sintering kilns, high-temperature heat treatment furnaces and vertical diffusion furnaces, with full traceable material test certificates available on request.

For industrial furnace designers, heating element manufacturers and high-end procurement teams sourcing thick FeCrAl heating wire for ultra-high temperature applications, finding a material that delivers long service life and dimensional stability above 1300°C remains a persistent industry challenge. Conventional cast FeCrAl alloys often suffer from composition segregation and uneven microstructure in large-diameter specifications, leading to coil sagging, accelerated oxidation and unplanned furnace downtime.

Developed independently by Shougang Gitane, SGHT powder metallurgy ultra-high temperature heating wire addresses these pain points with advanced manufacturing technology and strict compliance with GB/T 1234-2012 High resistance alloys for electrical heating national standard. It outperforms traditional melted FeCrAl grades in high-temperature strength, creep resistance and service life. This article introduces the technical features, core performance, specifications and typical applications of SGHT thick round wire (φ1.0–8.5 mm) for global industrial heating buyers.

Powder Metallurgy Manufacturing with Standard-Compliant Quality Control

Unlike standard FeCrAl resistance wires produced via traditional melting and casting, SGHT starts with refined master alloy, which is atomized into uniform fine powder and consolidated into fully dense ingots via hot isostatic pressing, followed by specialized hot/cold working and precision heat treatment. This process fundamentally eliminates composition segregation and grain inhomogeneity in large-diameter wire, ensuring consistent performance across the entire cross-section of thick gauge products.

All SGHT thick heating wires are manufactured, inspected and accepted in strict accordance with GB/T 1234-2012, covering chemical composition tolerance, dimensional accuracy, mechanical properties, electrical resistivity and acceptance test methods. As a leading enterprise in China’s electrothermal alloy industry, Shougang Gitane has presided over or participated in the formulation of all national standards for heating alloys, holding 72 authorized patents. Decades of technical heritage ensure every batch of SGHT wire delivers consistent, traceable quality recognized by industrial buyers worldwide.

In 2020, Shougang Gitane launched China’s first powder metallurgy ultra-high temperature FeCrAl heating tube, ending the long-standing industry status of “wire available, tube unavailable” for ultra-high temperature FeCrAl materials. Built on the same powder metallurgy technology platform, the SGHT thick wire series matches the performance of top-tier imported high-temperature heating alloys, while offering more flexible lead times and superior total cost of ownership.

 Core Performance Advantages of SGHT Thick Round Wire 

SGHT is an Fe-Cr-Al based ultra-high temperature electrothermal alloy with optimized micro-alloy design within the GB/T 1234-2012 framework. Its typical chemical composition is: C ≤ 0.04%, Si ≤ 0.5%, Mn ≤ 0.4%, Cr 21–23%, Al 5.5–6.0%, Fe balance. For thick wire used in heavy-duty industrial heating coils, its advantages are reflected in four key dimensions:

1、Industry-leading temperature capability

The maximum element operating temperature of SGHT reaches 1420°C, suitable for long-term operation in high power density, corrosive atmosphere and carburizing furnace environments. Its temperature limit significantly exceeds common NiCr alloys and standard FeCrAl grades such as 0Cr25Al5, enabling higher furnace throughput and more demanding thermal processing technologies.

2、Superior creep resistance and anti-sagging performance

For horizontally installed thick wire heating coils, high-temperature creep deformation is the primary cause of element failure and shortened service life. SGHT delivers outstanding high-temperature structural strength: annealed tensile strength at room temperature is 650–750 MPa with 15–25% elongation. At 1000°C, its 100-hour creep strength reaches 7.1 MPa, and high-temperature tensile strength remains 24–28 MPa. This greatly reduces coil sagging and collapse risk during continuous high-temperature operation, extending furnace maintenance intervals and reducing replacement costs.

3、Stable and predictable electrical properties

SGHT has a resistivity of 1.45 ± 0.07 μΩ·m at 20°C, with finished wire resistance tolerance within ±5%, fully meeting the accuracy requirements of GB/T 1234-2012 for wire diameters above 0.32 mm. Its temperature coefficient of resistance (Ct) is 1.03 at 800°C, 1.04 at 1000°C and 1.05 at 1400°C. The predictable and stable resistance-temperature relationship allows heating element designers to accurately calculate coil dimensions, power output and temperature control parameters, reducing design iterations and improving overall equipment reliability.

4、Excellent oxidation resistance and extended service life

SGHT forms a dense, firmly adherent Al₂O₃ protective oxide scale at high temperatures, effectively inhibiting further internal oxidation and corrosion. Its emissivity in fully oxidized state reaches 0.7, improving thermal radiation efficiency and energy utilization. Tested according to GB/T 13300-91 standard, the fast service life at 1350°C exceeds 80 hours. In practical industrial furnace applications, SGHT thick wire delivers significantly longer service cycles than conventional melted FeCrAl alloys under identical furnace temperature and surface load conditions.

 Thick Wire Specifications & Delivery Conditions 

This product line covers SGHT thick round wire with diameter from 1.0 mm to 8.5 mm, available in standard delivery conditions to suit different processing and application scenarios:

• φ1.0–5.0 mm: Golden-yellow oxidized finish, supplied in coil form for general coil winding
• φ5.0–8.5 mm: Blue oxidized finish, supplied in coil form for heavy-duty large-coil applications

All dimensional tolerances comply with GB/T 1234-2012 specifications, ensuring excellent winding processability and interchangeability for heating element manufacturers. Custom surface finishes, spool packing and special heat treatment states can be arranged according to customer technical requirements.

Shougang Gitane provides complete meter resistance and weight per meter reference data for each wire diameter, enabling buyers to quickly estimate material consumption and procurement cost for heating element designs. In addition to round wire, the SGHT product family also includes flat ribbon (0.5–2.5 mm thickness, 5–48 mm width) and powder metallurgy heating tubes to support diversified ultra-high temperature heating solutions.

Design note: Surface load is a critical parameter directly affecting element service life. Higher surface load increases element operating temperature and reduces durability. When designing heating coils with SGHT thick wire, it is recommended to select appropriate surface load based on actual furnace temperature, atmosphere, support structure and thermal cycle frequency, with reference to the material’s dedicated surface load-temperature curve.

 Typical Application Fields 

SGHT thick FeCrAl heating wire is engineered for demanding industrial thermal processing scenarios where standard heating alloys cannot meet service life targets. It is widely selected by international furnace manufacturers and industrial end-users in the following fields:

• High-temperature ceramic sintering kilns: For continuous sintering of advanced structural ceramics, electronic ceramics and refractory materials above 1300°C, where large-diameter coils maintain dimensional stability and resist sagging during long production runs.
• High-temperature heat treatment furnaces: Suitable for solution treatment, high-temperature tempering and vacuum brazing of special alloys, as well as processes involving carburizing and mildly corrosive atmospheres.
• Vertical diffusion furnaces & electronic industrial furnaces: Provides stable, low-contamination heating for semiconductor and electronic component manufacturing requiring precise ultra-high temperature control.
• Laboratory and pilot-scale high-temperature furnaces: Delivers reliable, long-lasting heating performance for research institutions and material testing laboratories operating chamber furnaces near 1400°C.

By replacing imported premium heating alloys with SGHT thick wire, overseas customers can achieve equivalent high-temperature performance while reducing procurement costs and shortening delivery lead times, effectively minimizing production downtime caused by heating element failure.

 Quality Assurance & Supply Capability 

As a national-level specialized and sophisticated "Little Giant" enterprise and national green factory with 68 years of experience in electrothermal alloy R&D and manufacturing, Shougang Gitane provides comprehensive quality and service support for global customers:

• Each shipment can be supplied with material Test Certificate , covering chemical composition, resistivity, mechanical properties and test records, all fully traceable to GB/T 1234-2012.
• Professional technical team supports material selection guidance, coil design consultation and after-sales technical service.
• Flexible production capacity supports both small-batch trial orders and bulk mass production, with stable delivery cycles for international orders.

 Conclusion 

Fully compliant with GB/T 1234-2012, SGHT powder metallurgy thick FeCrAl heating wire represents a high-performance domestic solution for ultra-high temperature electrothermal applications. Its homogeneous powder metallurgy microstructure, excellent creep resistance and 1420°C temperature capability solve the common failure problems of large-diameter heating coils in high-temperature industrial furnaces, helping global customers reduce maintenance frequency, extend equipment service life and lower total operating costs.

If you are looking for a reliable ultra-high temperature FeCrAl thick wire supplier to replace imported premium grades, contact Shougang Gitane’s international sales team to request the full SGHT datasheet, detailed resistance reference table and customized quotation for your required specifications.