Nitrided Bimetallic Single Screw Barrel and Screw for High-Filler PVC Extrusion
URL Slug: nitrided-bimetallic-single-screw-barrel-pvc
Product Summary
This single screw barrel and screw set features a nitrided bimetallic design specifically for high-filler PVC extrusion applications. The bimetallic lining (alloy hardness HRC50-65, depth 0.8-2.0mm) combined with nitrided case (HV850-1000, depth 0.45-0.7mm) ensures superior resistance to abrasive calcium carbonate fillers. Suitable for film blowing and pipe extrusion lines processing PVC compounds with high filler content.
Key Selling Points
- Bimetallic Wear Protection: Alloy layer hardness HRC50-65 with 0.8-2.0mm depth provides extended service life (1-5 years under normal high-filler conditions).
- Nitrided Case Hardness: HV850-1000 nitrided surface (depth 0.45-0.7mm) reduces friction and improves plasticizing efficiency.
- Chromium Plating After Nitriding: ≥900HV surface hardness and 0.025-0.10mm plating depth further enhance corrosion and wear resistance.
- Precision Manufacturing: Surface roughness Ra 0.4 and straightness 0.015mm ensure uniform melt flow and dimensional consistency.
- ISO Certified Quality: Manufactured under ISO9001:2015, ISO14001:2015, and ISO45001:2018 management systems.
Technical Specifications
| Parameter | Value |
| Diameter Range | Φ20 - Φ500 |
| Nitrided Hardness | HV850-1000 |
| Nitrided Case Depth | 0.45-0.7 mm |
| Alloy Hardness | HRC50-65 |
| Alloy Depth | 0.8-2.0 mm |
| Surface Roughness | Ra 0.4 |
| Straightness | 0.015 mm |
| Chromium Plating Hardness | ≥900 HV |
| Chromium Plating Depth | 0.025-0.10 mm |
Models and Options
Available in diameters from Φ20 to Φ500. The bimetallic lining is applied to the barrel inner surface. Material options include 38CrMoAl, 42CrMo, SKD61, and other alloys suitable for nitriding and bimetallic overlay. Custom lengths and feed section geometries are available upon request.
Materials and Structure
The screw and barrel are manufactured from high-grade alloy steels such as 38CrMoAl (1.8509), 42CrMo, SKD61, or equivalent, with a nitrided case and bimetallic alloy lining on the barrel. The bimetallic layer provides wear resistance against abrasive fillers. The screw can be nitrided or coated with chromium for enhanced performance.
Applications
Specifically designed for high-filler PVC pipe, profile, and sheet extrusion lines. Works with PVC conical twin-screw extruders (as per our application scenario) but also suitable for single screw extruders processing high-filler PVC compounds. Continuous counter-rotating conical twin-screw extrusion is typical, but the single screw variant can be adapted for pre-plasticizing or secondary extrusion stages.
Customization
We offer custom diameters, lengths, flight geometries, and material combinations to match your extruder specifications. MOQ: 1 unit. Delivery: FOB/CIF. Payment: 30/70. Pre-shipment testing available.
Case Study
Client: Plastic Products Manufacturer
Application: High-wear and corrosive polymer processing, compounding, and extrusion/molding production.
Result: Significantly enhanced wear and corrosion resistance, prolonged equipment service life, and minimized production downtime.
Highlight: Wear resistant, long lifetime, excellent plasticizing effect.
(Source: Case ID 1600)
FAQ
What is the typical lifespan of your nitrided bimetallic barrel?
Under normal high-filler PVC extrusion conditions, the barrel and screw set typically lasts 1-5 years, depending on filler content and operating parameters.Can the bimetallic layer be repaired or replaced?
We recommend replacement of the barrel assembly as the bimetallic lining is integrally applied. However, we can provide refurbishment services for certain configurations.Do you offer sample or prototype machining?
Yes, we accept custom orders with batches from 1 to 50 pieces based on technical drawings.What certifications do your products hold?
Our manufacturing facilities are ISO9001:2015, ISO14001:2015, and ISO45001:2018 certified.How do you ensure dimensional accuracy?
We use advanced CNC machining and German-imported inspection equipment, with straightness tolerance of 0.015mm and surface roughness Ra 0.4.Can this product be used for non-PVC materials?
While optimized for PVC, the bimetallic design also performs well in processing abrasive engineering plastics. Please consult our engineers for specific material compatibility.What is the minimum order quantity?
MOQ is 1 unit.Inquiry Information
For pricing and technical consultation, contact:
Name: Martin
Email: info@gmscrew.com
Tel: +86 13575629951
WhatsApp: +86 13858143949
Address: Zhoushan, China
Download catalogue: Product Catalogue
Image Filename and Alt Suggestions
- nitrided-bimetallic-barrel-front.png - Alt: Nitrided bimetallic single screw barrel front view for PVC extrusion
- nitrided-bimetallic-barrel-side.png - Alt: Side view of bimetallic lined barrel with nitrided screw
- nitrided-bimetallic-barrel-closeup.png - Alt: Close-up of bimetallic alloy layer and nitriding surface
