Company Overview

Sistem Teknik, founded in 1979, is a global leader in designing and manufacturing thermal processing equipment for various industries. The company offers turnkey plant solutions, commissioning, start-up services, personnel training, and complies with European and NADCAP aviation standards. It collaborates with scientific centers to provide integrated technological support, auxiliary equipment, and industrial/laboratory testing.

Industries Served

• Metallurgical
• Automotive
• Mechanical Engineering
• Toolmaking
• Medical
• Electronics
• Energy
• Nuclear
• Agricultural
• Foundry
• Defense
• Space and Aviation

Mission

The mission emphasizes maintaining leadership through in-house R&D, technological investments, and customer satisfaction. The R&D division is equipped for customized research and testing with advanced laboratory and metallographic analysis.

Factory Location and Production Capabilities

Located in Kocaeli near Istanbul, the 12,000 m² factory produces a wide range of furnaces including vacuum, fire resistance testing, automotive suspension, protective atmosphere, soldering, bright annealing, steel improvement, gas carburizing/nitriding, aluminum aging, homogenization, extrusion line, foil annealing, and thermal processing lines.

Technical Design and Engineering

Sistem Teknik uses advanced 3D modeling (SolidWorks, AutoCAD-LT) and analytical tools (CosmosWorks) to design flexible, clean, and precise thermal equipment. Benefits include tailored solutions, high quality, cost efficiency, long lifespan, ease of operation/maintenance, and short payback periods.

Vacuum Thermal Processing

Vacuum processing is widely applied for quenching, tempering, annealing, brazing, sintering, and chemical-thermal treatments. Advantages include no oxidation or decarburization, bright surfaces, stable material properties, reduced deformation, elimination of hydrogen embrittlement, environmental cleanliness, and energy savings. High-pressure gas cooling and compression vacuum furnaces expand applicability and improve quenching quality.

Vacuum Furnace Features

• Compliance with AMS 2750-E, NADCAP, CQI-9
• Horizontal/vertical loading; load capacity 1–3000 kg
• Insulation: graphite, ceramic, metallic; vacuum levels 10⁻² to 10⁻⁸ mbar
• Operating temperatures above 2000°C; temperature uniformity ±3 to ±5°C
• Gas cooling pressures 0.9–40 bar with various gases
• Two-chamber furnaces for oil quenching
• Dynamic radial/axial cooling; multi-stage pumping systems
• PC-based NADCAP-compatible control with SCADA data acquisition

Heating Zone Designs

Two main horizontal furnace chamber shapes:

• Rectangular: gas cooling from multiple sides, round graphite rods, U-shaped chambers with molybdenum elements for special needs
• Cylindrical: versatile for taller/wider loads, fully metallic chambers with multi-layer radiation shields and segmented graphite elements

Special Application Equipment

• Cryogenic tempering furnaces (-100°C to +600°C)
• Rotating load horizontal furnaces to reduce deformation
• Vertical furnaces with tailored heating zones
• Vacuum furnaces with oil/gas cooling for large loads
• Vacuum sintering furnaces with sliding floors
• Induction vacuum furnaces for melting/casting aerospace and military alloys

Insulation Materials

• Ceramic fiber
• Graphite felt, foil, rigid plates
• Refractory metals (molybdenum, tantalum-tungsten alloys)
• Carbon fiber composites
• Combined metal-carbon insulation

Vacuum Quenching Furnaces Series VF-2D-A

Series designed for vacuum quenching with load capacities from 50 to 2500 kg, operating up to 2300°C and vacuum levels down to 10⁻⁸ mbar. Certified to CE and NADCAP standards.

Cooling System Variants

Internal cooling systems optimize compactness and performance; external systems offer economic advantages and flexibility, adaptable for high-pressure operation.

Standard Vacuum Furnace Models and Specifications

Standard Features and Options

• Graphite insulation, convection heating
• Standard max temperature 1350°C; up to 2300°C with molybdenum elements
• Vertical/horizontal gas quenching (N2 standard at 6.0 bar)
• PLC control with PC interface
• Options: high-pressure reservoirs, multi-zone temperature control, alternative quenching gases (Ar, He), cryogenic treatment, closed-loop water cooling, vacuum to 10⁻⁸ mbar, noise protection, SCADA integration, remote diagnostics

Vacuum Furnaces for Tempering (VF-te Series)

Designed for 250–2500 kg loads, supporting gas nitriding, black oxidation, nitrocarburizing with stainless steel retorts, vacuum purging, protective atmospheres, and temperature uniformity ±3°C. Cooling options include indirect air and direct gas-water heat exchangers. Additional features include computerized control, afterburners, and supervisory interfaces.

Vacuum Brazing Furnaces

Provide clean, flux-free brazing with high integrity. Available in vertical and horizontal types with load capacities up to 2500 kg and temperature uniformity ±5°C. Features include automatic program control, adjustable gas cooling, short cycles, and vacuum levels 10⁻² to 10⁻⁵ mbar. Applications span aerospace, automotive, medical, and energy sectors.

Vertical Vacuum Furnaces with Elevator Loading

Designed for aerospace applications with graphite or metallic chambers, vacuum levels down to 5×10⁻⁶ mbar, and AMS 2750 E compliant temperature uniformity. Alternative top shaft loading available.

"Golden Door®" Technology

Patented front door with TÜV Rheinland certification, safe for hydrogen use, minimizes part deformation, and enables hydrogen or nitrogen-hydrogen gas quenching with oil-quenching quality in single-chamber furnaces.

Laboratory Vacuum Furnaces

Used in atomic, electronic, aerospace industries with high-purity gases at pressures up to 0.02 MPa. Features water-cooled stainless steel bodies, molybdenum/tungsten hot zones, low gas emission, low thermal inertia, automatic/manual temperature control, max temperature 2500°C, vacuum to 10⁻⁶ mbar, and load capacity 1 kg.

Quenching Media Heat Transfer Characteristics

Data provided on heat transfer coefficients and quenching intensities for nitrogen, salt, polymer, oil, water, helium, and hydrogen, guiding selection based on material thickness and cooling requirements.

Roller Hearth Furnaces

Continuous furnaces with virtually unlimited length, high productivity, minimal metal loss, and high mechanization. Features include electric/gas heating, controlled atmospheres, full automation, recuperative energy efficiency, and robust stainless steel rollers. Applications include rolling mills, steel sheets, rails, pipes, and billets.

Equipment Composition for Roller Hearth Furnaces

• Automatic loading/unloading
• Loading/unloading tables
• Purging zones
• Furnace with slow and fast cooling zones

Processes: annealing, isothermal annealing, bright annealing, normalization, hardening, tempering, stress relief, spheroidizing annealing.

Fire Resistance Testing Furnaces

Compliant with EN 1363-1 and EN 1363-2 standards for testing cables and construction materials. Types include vertical, horizontal, combined, modular, and smoke leakage designs with loads up to 100 tons and heating up to 1400°C. Features include exhaust hoods and gas cleaning systems.

Thermal Treatment Equipment and Processes

Includes continuous lines (Series CL) for carburizing, nitrocarburizing, quenching, tempering with mesh/articulated belts, double folding curtains for atmosphere isolation, gas/electric heating, and recuperators. Walking beam furnaces offer hydraulic/mechanical drive, automatic loading, and oxygen control. Controlled atmosphere soldering furnaces provide uniform, clean soldering with various atmospheres and heating options.

Retractable hearth furnaces feature modular design, pneumatic door sealing, recuperative combustion, and temperature uniformity compliant with AMS 2750D Class 4. Shaft and bell-type furnaces support large parts with controlled atmospheres and various heating methods. Pusher furnaces enable simple transport and heating for metallurgy and mechanical engineering.

Fluidized bed equipment offers rapid heating with low emissions and precise atmosphere control for steels and alloys. Universal batch furnaces (Type GkF) provide controlled atmosphere chemical-thermal treatment with automated loading, microprocessor control, and ISO 9004 compliant data archiving.

Control and Management Systems

• Integrated SCADA software with user-friendly interface
• Database for steels/alloys and offline carbon diffusion simulation
• Real-time process visualization, scheduling, archiving, and documentation

Repair, Modernization, and Spare Parts

• Upgrading control/regulation systems
• Replacing furnace linings with modern insulation
• Designing and installing tailored heating elements

Standards Compliance

• CE certification
• EN ISO standards (9000/9001, 11690:2010, 13850, 1634-3, 1299+A1)
• SAE-AMS standards (AMS 2750, 2759-1E, 2769 B, 2774 C)
• CQI 9 automotive heat treatment standard
• IEC standard IES-584

Additional Technical Data

Includes pressure unit conversion tables for accurate instrumentation calibration and AMS 2750 D requirements for furnace classes and instrumentation tolerances. Hardness comparison tables (Brinell, Rockwell C, Vickers) support material characterization and quality control.

Critical Summary

• Wide range of vacuum furnace capacities (1–2500 kg) and temperatures (up to 2300°C)
• Support for multiple inert and reactive gas atmospheres
• Flexible cooling systems (internal/external) adaptable to process needs
• Advanced automation and control (PLC, SCADA) ensure repeatability and diagnostics
• Innovative technologies like "Golden Door®" enhance safety and quenching quality
• Roller hearth furnaces enable continuous, energy-efficient, high-throughput processing
• Fire resistance testing furnaces comply with international standards for material safety evaluation

This comprehensive technical overview highlights Sistem Teknik's expertise in thermal processing equipment design, manufacturing, control systems, and service support, ensuring high-quality, efficient, and standards-compliant industrial heat treatment solutions.