Medium-Fine Carbon Sleeve for GO Silicon Steel
Designed specifically for grain-oriented silicon steel annealing lines, this medium-fine structure carbon sleeve reliably operates in demanding ammonia-containing atmospheres up to 950℃. Developed through collaborative research with scientific institutions, it solves the critical challenge of ammonia corrosion that degrades conventional sleeves—ensuring stable strip support and surface quality throughout decarburization and nitriding processes.
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Ammonia-Resistant Formulation for GO Steel Annealing:Engineered with a specialized C-Si-N material system developed through collaborative research with scientific institutions, this carbon sleeve resists ammonia corrosion in decarburization and nitriding furnace sections—preventing surface degradation that compromises grain-oriented silicon steel quality.
Proven Technology with Decades of Field Validation:Based on breakthrough technology first commercialized in 2010 following successful scientific verification, this sleeve has been continuously refined through thousands of installations—delivering the confidence of mature, battle-tested performance in demanding GO applications.
Dual-Temperature Coverage for Complete Furnace Lines:Available in low-temperature (≤900°C) and medium-temperature (850–950°C) versions with distinct pore structures (0.2 mm vs. 0.1 mm), allowing seamless specification across both decarburization and nitriding zones from a single proven product family.
Optimized Pore Structure for Ammonia Environment Stability:Maximum pore size of 0.1–0.2 mm strikes the ideal balance between ammonia resistance and cost effectiveness—sufficiently dense to resist ammonia penetration while maintaining the economics required for high-volume GO steel production.
Balanced Mechanical Properties for Reliable Strip Support:Flexural strength of 15–18 MPa and compressive strength of 30–35 MPa provide the mechanical foundation for stable strip tracking through critical GO annealing stages, ensuring consistent magnetic property development without risk of roll failure.
Stable Graphitization for Consistent Surface Protection:Graphitization degree of 70–90% maintains reliable self-lubricating properties throughout the sleeve’s service life, minimizing friction-induced surface defects that could otherwise disrupt the precise Goss texture development in grain-oriented silicon steel.
Moderate Density Optimized for Ammonia Service:Bulk density of 1.72–1.75 g/cm³ combined with apparent porosity of 14–15% provides the optimal microstructure for ammonia-containing atmospheres—dense enough to resist chemical attack without the thermal stress sensitivity of ultra-high-density materials.
Historical Provenance in Critical GO Applications:Originally developed to replace imported sleeves in China’s premier GO steel facilities, this medium-fine structure sleeve carries decades of continuous improvement based on real-world performance feedback from demanding production environments.
Cost-Effective Entry Point for GO Steel Production:By focusing material science precisely on ammonia resistance rather than over-engineering for unrelated performance attributes, this sleeve delivers reliable GO annealing capability at the most accessible price point—lowering barriers for producers entering grain-oriented markets.
Application
Conventional Grain-Oriented Steel Decarburization Lines:In the low-temperature sections (800–900°C) of CGO steel production lines where ammonia-containing atmospheres are first introduced, this medium-fine sleeve provides reliable resistance to initial ammonia attack—ensuring stable strip tracking during the critical decarburization phase without premature surface degradation.
Nitriding Furnace Sections for Standard GO Grades:For producers manufacturing conventional grain-oriented steels requiring nitrogen pickup at 900–950°C, this sleeve’s optimized pore structure (≤0.1 mm for MT version) withstands the combined challenges of elevated temperature and ammonia exposure—maintaining dimensional stability throughout the nitriding process.
HiB Steel Roughing Zones Before Final Texture Development:In high-permeability grain-oriented lines where ultra-fine surface control is not yet critical, this cost-effective sleeve handles early-stage ammonia exposure in pre-heating and initial annealing zones—reserving premium composite sleeves for final texture development stages.
Multi-Grade GO Production Facilities with Frequent Changeovers:For plants alternating between CGO and HiB production schedules, this medium-fine sleeve offers sufficient ammonia resistance for both grades while enabling economical operation during non-premium production runs—reducing overall refractory costs without compromising quality.
Transformer Core Annealing Lines with Legacy Furnace Equipment:In older facilities processing grain-oriented steels for distribution transformers where furnace atmosphere control may vary, this sleeve’s proven C-Si-N formulation provides dependable ammonia resistance even when process conditions deviate from optimal—protecting against unexpected corrosion events.
Performance metrics | Low-temperature carbon sleeve | Medium temperature carbon jacket | Flexural strength/ MPa | ≥15
| ≥18
|
|---|---|---|
compressive strength/ MPa | ≥30 | ≥35
|
Apparent porosity/% | ≤15 | ≤14 |
Bulk density/ g·cm-3 | ≥1.72 | ≥1.75 |
Degree of graphitization/% | 70~90 | 70~90 |
Shore hardness/HS | 35~50 | 35~50 |
Maximum aperture size/mm | ≤0.2
| ≤0.1
|
Terms of use | Normal temperature -900°C dry/Wet atmosphere
| 850-950°C dry/Wet atmosphere |
Contacts
ADDRESS: 4578 Marmora Road, Glasgow, D04 89GR
PHONES: (800) 123-0045; (800) 123-0046</span
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