China Nanjing Zhitian Mechanical And Electrical Co., Ltd. company news

What is ZT615A nickel-based alloy and why is it important? ZT615A is an advanced nickel-based alloy developed by ZHITIAN, designed specifically for demanding industrial applications requiring exceptional wear resistance and corrosion protection. The alloy's main chemical composition includes more than 60% Nickel (Ni), over 15% Chromium (Cr), and significant Iron (Fe) content, which together provide a durable and stable metal matrix suitable for harsh working environments. Material Chemical Composition C Si B Cr Fe Ni ZT615A 0.8-1.2 3.0-5.0 3.0-4.0 15-18 ≤5 bal. How does ZT615A achieve high hardness and durability? After vacuum sintering, ZT615A forms a dense alloy layer approximately 2 millimeters thick on surfaces such as the eight-shaped hole of twin screw extruder barrels. This layer exhibits a uniform metallographic structure with low porosity. The hardness reaches an impressive range of HRC 55-58, providing strong resistance against mechanical wear. What makes ZT615A highly wear-resistant? ZT615A contains hard phase elements such as Chromium (Cr), Silicon (Si), and Boron (B). During high-temperature sintering, these elements form fine, dispersed carbide particles throughout the alloy matrix. These carbides greatly enhance the alloy's wear resistance. Laboratory abrasion tests show that under identical conditions, ZT615A's wear resistance is 2.5 to 3 times higher than that of conventional high-speed tool steel M2 (W6Mo5Cr4V2). How does ZT615A perform in corrosion resistance? Nickel is known for its excellent high-temperature stability, corrosion resistance, and rust prevention. Coupled with a high Chromium content, ZT615A significantly outperforms traditional iron-based corrosion-resistant alloys like 304 and 316L stainless steel. This makes it ideal for environments with chemical exposure or high thermal oxidation demands. FAQ: Frequently Asked Questions about ZT615A Alloy Q1: What industries can benefit from ZT615A alloy? A1: Industries requiring durable components under high wear and corrosive conditions such as plastic extrusion, chemical processing, and metallurgy benefit greatly from ZT615A. Q2: How thick is the alloy layer formed by ZT615A powder on equipment surfaces? A2: Typically, a 2 mm thick dense layer is formed via vacuum sintering, providing long-lasting protection. Q3: Can ZT615A replace traditional tool steels in extrusion barrels? A3: Yes. Due to its superior hardness and wear resistance, ZT615A is an excellent replacement, especially in harsh extrusion conditions. Q4: How does ZT615A compare to stainless steel in corrosion resistance? A4: ZT615A has much higher corrosion resistance than common stainless steels such as 304 and 316L, due to its high Nickel and Chromium content. About ZHITIAN's Material Innovation .gtr-container { font-family: Arial, sans-serif; color: #333333; line-height: 1.6; max-width: 900px; margin: 0 auto; } .gtr-heading { font-size: 20px !important; font-weight: 700; color: #1a5276; margin: 25px 0 15px 0; padding-bottom: 8px; border-bottom: 2px solid #2874a6; } .gtr-content { font-size: 14px !important; margin-bottom: 20px; } .gtr-faq-question { font-weight: 600; color: #2874a6; margin: 15px 0 5px 0; } .gtr-faq-answer { margin-left: 20px; margin-bottom: 15px; } .gtr-list { margin-left: 20px; padding-left: 0; } .gtr-list li { margin-bottom: 8px; list-style-type: disc; } .gtr-highlight { font-weight: 600; color: #2874a6; } ZHITIAN has developed ZT615A as part of its continuous effort to provide advanced alloy solutions tailored for twin screw extruder parts and other demanding applications. Combining metallurgical expertise and state-of-the-art powder metallurgy technology, ZHITIAN ensures each batch meets rigorous quality standards, supporting customers worldwide with durable and high-performance materials.

Which material should you choose for extrusion barrels under high-corrosion and high-temperature conditions? ZT610 nickel-copper alloy, independently developed by ZHITIAN, is engineered to replace Hastelloy C for twin screw extruder barrel applications. Produced using vacuum hot-press sintering, ZT610 features high density, low porosity, and uniform metallurgical structure. Compared to Hastelloy C, it delivers significantly enhanced wear resistance and corrosion performance, making it ideal for highly corrosive industries such as chemicals, pesticides, fluoropolymers, chlorinated polymers, organic salts, and marine applications. What makes ZT610 different from Hastelloy C? ZT610 achieves a hardness above HRC45, whereas Hastelloy C offers only HRC20-21. In abrasion testing, ZT610 performs 4 times better under identical conditions. In terms of corrosion resistance, ZT610 achieves 1.5 to 2 times the resistance of Hastelloy C, making it suitable for long-term, high-shear, and chemically aggressive extrusion processes. ZT610 Key Benefits: High hardness and superior wear resistance (HRC ≥ 45) Nickel-copper matrix improves corrosion performance by forming solid solutions Added molybdenum and chromium for enhanced chemical resistance Vacuum hot-pressed for high structural density and stability Specially designed for twin screw extruder barrel applications How ZT610 Works ZT610 forms a high-density solid solution structure at elevated temperatures, thanks to the full miscibility of nickel and copper. With the addition of molybdenum and chromium, the alloy resists both intergranular corrosion and pitting under acidic or alkaline conditions, ensuring long-term stability. ZT610 Typical Specifications: Item ZT610 Nickel-Copper Alloy Main Elements Ni, Cu, Mo, Cr Production Method Vacuum Hot-Press Sintering Application Twin Screw Extruder Barrels Suitable Industries Chemicals, Fluoropolymers Hardness HRC ≥ 45 Corrosion Resistance 1.5–2× of Hastelloy C Wear Resistance 4× of Hastelloy C Frequently Asked Questions What industries benefit from ZT610 alloy?ZT610 is widely used in chemical synthesis, chlorination, fluoropolymer processing, precision chemical reactions, and other harsh environments involving hydrochloric acid, HF, and high-temperature organic solvents. ZT610 vs Hastelloy C: How to choose?If your goal is to extend equipment life and reduce maintenance costs, ZT610 is the ideal replacement. ZHITIAN offers custom-sized extrusion barrel components using ZT610 for optimal performance.  Keywords: ZT610 alloy Hastelloy C alternative corrosion-resistant alloy twin screw extruder barrel material  Ni-Cu alloy barrel ZHITIAN metal materials fluoropolymer extrusion alloy vacuum hot-press alloy

The barrel of a twin screw extruder is a key wear part that directly affects extrusion performance, mixing efficiency, and product quality. Replacing the barrel at the right time can prevent equipment failure and reduce overall production costs. So, how can you tell when the barrel needs to be replaced? 1. Increased Clearance Between Screw and Barrel When the gap between the screw and the barrel increases beyond the standard value (typically 0.1–0.4 mm depending on size), the material seal is no longer tight. This can lead to pressure instability, poor plasticization, and material backflow. 2. Visible Inner Surface Wear If the inner wall of the barrel shows significant wear, scratches, or even grooves, especially at the feeding and degassing zones, it indicates serious wear and reduced shear efficiency. 3. Decline in Product Quality If you observe unstable extrusion output, inconsistent pellet size, or poor material dispersion, it may be a result of barrel wear that affects the mixing and conveying processes. 4. Frequent Overheating or Vibration Abnormal temperature rises or mechanical vibrations during operation may be caused by uneven wear or misalignment in the barrel. 5. Maintenance Record and Service Life Regularly track the operating time of the barrel. For standard nitrided steel barrels, the typical service life is around 12–18 months. For bimetallic or wear-resistant barrels, it can extend to 2–3 years. Once the expected lifespan is reached, a detailed inspection is recommended. FAQ Q: What’s the most common cause of barrel wear?A: High filler content, glass fibers, corrosive additives, and poor material selection are major factors. Q: Can I repair a worn barrel instead of replacing it?A: For slight wear, inner surface grinding or re-lining may help. But for severe wear, replacement is more cost-effective. Q: How to extend the service life of a barrel?A: Choose the right material (e.g., ZHITIAN’s ZT715/ZT818 with carbide content up to 82%) and ensure proper cooling, lubrication, and maintenance.

Introduction In the world of twin screw extrusion, barrel wear is a persistent challenge that directly affects production efficiency, product consistency, and maintenance costs. Choosing the right wear-resistant material is not only about durability—it’s also about balancing cost, application environment, and corrosion resistance. In this article, we explore the most effective materials for twin screw extruder barrels and introduce Zhitian’s advanced alloy options to help you make a smarter, long-term decision. Why Does Wear Resistance Matter in Extruder Barrels? Wear resistance determines how long your barrel can withstand the constant mechanical abrasion from screw elements and filler-loaded materials. In high-throughput applications, improper material selection can lead to frequent barrel replacement, downtime, and increased production cost. Key factors that affect barrel wear: Processing abrasive materials (glass fiber, CaCO₃, pigments) High temperature and pressure conditions Corrosive additives or polymers Extended operation hours Zhitian’s Wear-Resistant Barrel Materials Overview Zhitian offers a diverse range of barrel materials, each engineered for specific wear and corrosion conditions: Material Code Type Alloy System Key Properties Applications ZT610 Ni-Cu Nickel–Copper Alloy Excellent corrosion resistance; moderate wear resistance Corrosive but low-abrasive processes ZT615 Ni-Cr Nickel–Chromium Alloy Balanced corrosion + wear resistance Universal-grade for mixed applications ZT715 Ni–WC Nickel–Tungsten Carbide, 15% WC Entry-level wear protection Moderate filler content ZT725 Ni–WC Nickel–Tungsten Carbide, 25% WC Enhanced wear resistance High filler or glass-fiber loading ZT735 Ni–WC Nickel–Tungsten Carbide, 35% WC Strong wear protection High-output or abrasive environments ZT818 Co–WC Cobalt–Tungsten Carbide, 82% WC Ultra-high hardness, best-in-class wear resistance Extreme wear conditions How to Choose the Right Material? Scenario Recommended Material High corrosion, low wear ZT610 Balanced corrosion + wear ZT615 General plastic compounding ZT715 High filler content (CaCO₃, GF) ZT725 or ZT735 Long lifespan, extreme abrasion ZT818 FAQ: Twin Screw Barrel Wear-Resistant Materials Q1: What’s the difference between nickel-based and cobalt-based materials?A: Nickel-based materials like ZT610–735 offer a range of corrosion and wear protection. Cobalt-based ZT818 has superior hardness and is ideal for ultra-abrasive applications. Q2: Can ZT818 be used as a full barrel or only as a lining?A: Due to its extremely high hardness and cost, ZT818 is typically used for barrel lining or cladding, especially at high-wear zones like feed sections or vent ports. Q3: Are these materials compatible with laser cladding?A: Yes. Zhitian applies precision laser cladding technology, allowing these alloys to bond effectively with base metals like 38CrMoAl, ensuring both mechanical integrity and longevity. Q4: Which material offers the best cost-performance ratio?A: ZT725 is widely regarded as the best balance between cost and performance for typical filler-loaded extrusion lines. Q5: How can I customize my barrel with Zhitian materials?A: Zhitian supports full customization, including twin-barrel assemblies, lined barrels, vented designs, and multi-material segment transitions based on your extrusion recipe. Export-Ready. Performance-Proven. With over 15 years of experience and two fully equipped factories in Nanjing and Anhui, Zhitian serves customers across Europe, Southeast Asia, and the Americas. Our CNC-machined barrels are trusted by OEMs and rebuilders alike. Whether you're in plastic compounding, masterbatch production, or high-volume extrusion, choosing the right wear-resistant barrel material can significantly extend equipment life and improve ROI. Keywords for extruder barrel materials Twin screw extruder barrel materials Wear-resistant alloy for extruder barrel Carbide-lined twin screw barrel High-performance extrusion components ZHITIAN bimetallic barrel solutions

In ZSK co-rotating twin screw extruders, bimetallic barrels are one of the most critical wear parts. Choosing the right barrel improves dispersion, shear performance, and overall extrusion efficiency, while significantly extending service life. 1. Identify Your Application Material type defines the barrel lining material: Plastic compounding / masterbatch: Cr26 or WR13 linings for high filler wear resistance. Biodegradable materials (PLA, PBAT, PBS): Nickel-based or SAM26 for anti-acid corrosion. Food or medical grade: 316L or pollution-free linings to meet safety regulations. Engineering plastics: Heat- and corrosion-resistant bimetallic barrels are ideal. 2. Confirm Key Specifications Center Distance:  precision match is essential. Barrel Type: Closed, venting, side feeder, or combi-barrel must suit process needs. With or Without Liner: Most ZSK barrels use liners to enhance durability. 3. Recommended Material Selection Application Type Recommended Lining Key Features High-wear filler Cr26, WR13 High hardness, abrasion resistant Corrosive materials SAM26, Nickel alloy, 316L Acid-resistant, durable General engineering plastics Cr12MoV, 38CrMoAla Good heat treatment, impact resistance Food-grade extrusion 316L, lead-free alloy Safe, FDA compliant 4. FAQ Q1: Can it replace original ZSK barrels?A: Yes. With matching center distance and hole diameter, it can fully replace ZSK58,ZSK70, ZSK92, etc. Q2: What’s the typical service life?A: Depending on material, up to 1–2 years for high-wear-resistant barrels. Q3: Are screw elements also available?A: Yes, ZHITIAN offers full spare parts including screws, shafts, and gearboxes for ZSK machines. Keywords for ZSK Twin Screw Extruder Barrels ZSK Twin Screw Barrel Replacement Bimetallic Barrel for High Wear Resistance Corrosion Resistant Extruder Barrel Linings Extruder Barrel for Engineering Plastics Food Grade Twin Screw Extrusion Barrel

What Are the Challenges in Engineering Plastics Pelletizing? In the engineering plastics industry, the twin screw extruder barrel plays a critical role in ensuring long-term stability and efficiency of the compounding process. However, continuous high-temperature, high-shear, and highly corrosive environments bring significant challenges to barrel materials and manufacturing quality. Zhitian's Solution: Advanced Barrel Design for Engineering Plastics Compounding Zhitian, founded in 2006, specializes in precision manufacturing of twin screw extruder barrels for engineering plastics granulation. With two production bases in Nanjing and Anhui, Zhitian integrates advanced CNC machining, laser cladding, and proprietary alloy technology to address the demanding needs of engineering plastics like PA, PBT, PC, PPS, and LCP. Key Advantages: Laser Cladding Technology: Zhitian applies a 1.5mm thick nickel-tungsten carbide alloy layer to the barrel's inner wall. This metallurgically bonded coating significantly enhances wear and corrosion resistance, especially for glass fiber-filled engineering plastics. Custom Alloy Solutions: Zhitian's proprietary materials such as ZT818 (Co-based carbide) provide 20 times the wear resistance of traditional tool steel (e.g., W6Mo5Cr4V2), making it a reliable choice for extreme compounding conditions. Adaptability: Compatible with a wide range of extruder models (diameter from 25mm to 150mm), the barrel can be customized based on torque grade, venting zones, and liner type (sleeved or integrated). Applications: Engineering plastics pelletizing (PA6, PA66, PC, PBT, PPS, LCP) High-glass-fiber filled masterbatch compounding Flame-retardant and conductive additive extrusion Recycled engineering polymer granulation FAQ Q1: How to improve wear resistance of extruder barrels for glass fiber materials? Apply a nickel-tungsten carbide alloy coating using laser cladding technology. Zhitian's ZT818 solution provides exceptional durability for high-glass-content formulas. Q2: What types of barrels are suitable for engineering plastics? Barrels with integrated or sleeved liners made from PM-HIP or cobalt-based materials are recommended, especially when processing materials like LCP, PPS, or flame-retardant PA. Q3: Can the barrel be customized for vented extrusion lines? Yes. Zhitian supports vented and vacuum barrel designs, and provides modular zones for side feeding, devolatilization, and pressure control. .gtr-container { font-family: 'Arial', sans-serif; color: #333; line-height: 1.6; max-width: 1000px; margin: 0 auto; padding: 20px; } .gtr-heading { font-size: 22px !important; font-weight: 700; color: #1a3e6f; margin: 25px 0 15px 0; padding-bottom: 8px; border-bottom: 2px solid #e0e0e0; } .gtr-subheading { font-size: 18px !important; font-weight: 600; color: #1a3e6f; margin: 20px 0 10px 0; } .gtr-text { font-size: 14px !important; margin-bottom: 15px; } .gtr-list { font-size: 14px !important; margin: 15px 0; padding-left: 20px; } .gtr-list li { margin-bottom: 8px; } .gtr-faq-question { font-size: 15px !important; font-weight: 600; color: #1a3e6f; margin: 15px 0 5px 0; } .gtr-faq-answer { font-size: 14px !important; margin-bottom: 20px; padding-left: 15px; border-left: 3px solid #e0e0e0; } .gtr-highlight { background-color: #f5f9ff; padding: 15px; border-radius: 4px; margin: 15px 0; }

In plastic modification processes--such as filler masterbatch production, glass fiber reinforcement, and engineering polymer blending--the twin screw extruder barrel is a critical component. It not only supports material feeding, plasticization, and transport, but also directly influences processing stability and product consistency. Challenges in plastic compounding environments Plastic compounding often involves abrasive fillers (like talc or calcium carbonate), corrosive additives, or high-temperature polymers. These materials can severely degrade the inner surface of barrels over time, especially when using conventional nitrided steel or basic alloys. Zhitian's advanced barrel solutions for compounding applications Zhitian offers high-performance barrels specifically engineered for demanding plastic compounding lines. The company uses premium wear- and corrosion-resistant materials such as SAM26, SAM39, and CPM10V--PM-HIP alloys known for their superior durability under abrasive and reactive environments. For even more extreme cases, Zhitian introduces laser cladding technology, applying a 1-2mm nickel-based tungsten carbide layer directly onto the barrel's inner surface. This metallurgical bond not only extends barrel lifespan but also enhances chemical resistance and thermal stability. The laser cladding solution is ideal for machines ranging from 65mm to 320mm and above. Optimized design for maximum production efficiency Zhitian's barrel designs are precision-machined to match twin screw extruders from major brands like Coperion, Leistritz, JSW, Theysohn, and others. Customizable barrel lengths, cooling channels, and material options help customers adapt their lines to different plastic formulations and throughput demands. Conclusion As compounders seek longer service life, improved efficiency, and stable product quality, upgrading to high-performance barrels is essential. Zhitian continues to support plastic compounding plants worldwide with advanced material technologies and engineering expertise. FAQ: Frequently Asked Questions About Twin Screw Extruder Barrels for Plastic Compounding Q1: What types of materials are used for barrels in plastic compounding? A: Common materials include nitrided steel (e.g., 38CrMoAl), tool steel (e.g., W6Mo5Cr4V2), and PM-HIP alloys such as SAM26, SAM39, CPM10V, which provide excellent wear and corrosion resistance. For extreme environments, laser cladding with nickel-based tungsten carbide is also applied. Q2: How do I choose the right barrel material for my compounding application? A: If your process involves abrasive fillers (e.g., glass fiber, talc), use high wear-resistant PM-HIP materials like CPM10V. For corrosive additives (e.g., flame retardants), corrosion-resistant grades such as SAM39 or laser-cladded barrels are recommended. Q3: Can Zhitian barrels fit my existing extruder model? A: Yes. Zhitian manufactures compatible barrel segments for many international brands, including Coperion (ZSK, STS), Leistritz (ZSE), JSW (TEX), Theysohn (TSK), Feddem (FED-MTS), and others. Q4: What's the benefit of laser cladding over traditional nitriding? A: Laser cladding creates a 1-2 mm metallurgical bond layer with superior wear and corrosion resistance. It lasts 4-6 times longer than nitrided steel, especially in filler- or flame-retardant-rich formulations. Q5: How long does a typical barrel last in plastic compounding? A: Service life depends on the material and operating conditions. Nitrided barrels may last 6-12 months under heavy wear, while PM-HIP or laser-cladded barrels can last over 2-3 years with stable performance. .gtr-container { font-family: Arial, sans-serif; color: #333333; line-height: 1.6; max-width: 1000px; margin: 0 auto; padding: 20px; } .gtr-heading { font-size: 20px !important; font-weight: bold; color: #1a5276; margin: 25px 0 15px 0; padding-bottom: 5px; border-bottom: 2px solid #3498db; } .gtr-subheading { font-size: 18px !important; font-weight: bold; color: #2874a6; margin: 20px 0 10px 0; } .gtr-paragraph { font-size: 14px !important; margin-bottom: 15px; } .gtr-list { font-size: 14px !important; margin-left: 20px; padding-left: 0; } .gtr-list-item { margin-bottom: 8px; } .gtr-faq-question { font-size: 14px !important; font-weight: bold; color: #21618c; margin: 15px 0 5px 0; } .gtr-faq-answer { font-size: 14px !important; margin-bottom: 20px; padding-left: 15px; border-left: 3px solid #aed6f1; }

When it comes to replacing barrels for twin screw extruders, precision, material standards, and compatibility are the top concerns for European equipment users. ZHITIAN, a certified manufacturer specializing in twin screw extruder components, offers ISO-compliant production, design support, and extensive export experience. Our barrels are designed for applications such as plastic compounding, masterbatch production, biodegradable materials, engineering plastics, and food-grade extrusion. Compatible with major brands including Coperion, Leistritz, Berstorff, JSW, TOSHIBA, Jwell, SM, KEYA, USEON, CPM, Buhler, Cowin, XINDA, and more. Why Choose ZHITIAN’s Twin Screw Extruder Barrels? Materials meet European standards (e.g., German 38CrMoAlA, 1.2344, 1.2379, 1.4112) Machining tolerances up to ±0.01mm; total run-out

Twin screw extruder screw elements are core components of the extrusion system. Especially under high-wear conditions, their wear resistance directly affects equipment stability and production costs. Choosing the right wear-resistant screw elements is key to ensuring high production efficiency and extending equipment lifespan. This article will detail how to select wear-resistant twin screw extruder screw elements from the perspectives of material selection, design structure, and manufacturing process. 1. Select High-Performance Wear-Resistant Materials Wear-resistant materials are the primary factor determining the service life of screw elements. Common wear-resistant materials include: High-Speed Tool Steel W6Mo5Cr4V2: Offers good hardness and wear resistance, suitable for general high-wear conditions. Powder Metallurgy PM-HIP Materials (such as WR5, WR13, CPM10V): Manufactured by powder metallurgy, these materials have higher hardness and superior wear resistance, ideal for extreme wear environments. Nickel-Based Tungsten Carbide Alloys: Used for higher strength and wear resistance in barrels and elements, providing excellent durability. Material selection should consider the specific working conditions and material properties to ensure hardness and wear resistance meet actual needs. 2. Optimize Screw Element Design Structure The design structure of screw elements also impacts their wear resistance. A reasonable geometry can effectively distribute wear and reduce local stress concentration. Common design optimizations include: Improving helix angles and pitch of conveying and kneading elements. Applying wear-resistant coatings or laser cladding technology to enhance surface hardness. Designing multifunctional elements to improve material mixing and conveying efficiency, reducing wear. 3. Strict Manufacturing Process Control Manufacturing precision affects the fit and performance of screw elements. High-precision machining and heat treatment can improve hardness and wear resistance, such as: CNC precision machining to ensure dimensional tolerance. Heat treatment processes to enhance material hardness. Advanced techniques like cold isostatic pressing and laser cladding to reinforce surfaces. 4. Choose Suppliers According to Working Conditions Professional screw element manufacturers provide material recommendations and customized solutions based on specific customer working conditions to ensure optimal wear resistance and system compatibility. Conclusion Selecting wear-resistant twin screw extruder screw elements requires a comprehensive evaluation of material performance, design rationality, and manufacturing process. ZHITIAN has years of experience in extruder parts R&D and manufacturing, offering a variety of high-performance wear-resistant materials and customized screw elements to help customers achieve efficient and stable production. Contact us to learn more about tailored solutions.

What Are the Nine Key Steps in Manufacturing Twin Screw Extruder Screw Elements? Twin screw extruder screw elements are the core working parts of the extruder. The precision and rigor of their manufacturing process directly affect equipment performance and service life. Based on years of industry experience, ZHITIAN summarizes the nine key steps in screw element production to ensure every product meets high standards of accuracy and durability. 1. Raw Material Inspection and Cutting All raw materials undergo strict inspection to ensure chemical composition and performance meet standards. Qualified materials are then cut and drilled to produce bars with required length and specifications. 2. Spheroidizing Annealing Spheroidizing annealing reduces material hardness and improves machinability, minimizing cracking and deformation risks during subsequent processing. 3. Rough Turning The bars are rough turned to remove most excess material, shaping them close to the final outer contour for easier finishing. 4. Internal Spline Machining Precision machining of internal splines in the central bore is critical for efficient torque transmission between the screw element and shaft. 5. End Face Truing The end faces are machined to ensure flatness, parallelism, and perpendicularity of the central axis, meeting assembly and operational requirements. 6. Surface Grinding Precise grinding controls dimensions and tolerances between end faces, achieving excellent surface finish and ensuring sealing and fit accuracy. 7. 3D Profile Machining Turning for conveying elements and milling for kneading elements create the final three-dimensional geometry to optimize material conveying and mixing. 8. Heat Treatment Strict heat treatment enhances hardness and strength, improving wear resistance and extending service life. 9. Final Profile and Surface Grinding Final precision grinding corrects heat treatment distortions, ensuring dimensional stability and high accuracy of the finished product. Conclusion Through rigorous control of these nine key steps, ZHITIAN's twin screw extruder screw elements achieve excellent performance, outstanding stability, and durability, meeting the demanding requirements of plastics, chemical, and new energy industries. .gtr-container { font-family: Arial, sans-serif; color: #333333; line-height: 1.6; max-width: 1000px; margin: 0 auto; padding: 20px; } .gtr-heading { font-size: 18px !important; font-weight: 700; color: #2a5885; margin: 25px 0 15px 0; padding-bottom: 8px; border-bottom: 2px solid #e0e0e0; } .gtr-subheading { font-size: 16px !important; font-weight: 600; color: #3a3a3a; margin: 20px 0 10px 0; } .gtr-content { font-size: 14px !important; margin-bottom: 15px; } .gtr-list { margin: 15px 0; padding-left: 25px; } .gtr-list li { margin-bottom: 8px; font-size: 14px !important; } .gtr-conclusion { font-size: 14px !important; font-style: italic; margin-top: 25px; padding-top: 15px; border-top: 1px solid #e0e0e0; }