If you are sourcing screw & barrel for extrusion or injection molding, you may have noticed a confusing situation:

The same size screw & barrel can have very different prices.
Sometimes the difference is 20%, 50%, or even 2–3 times.

Many buyers ask the same question:

“Why is the price so different? Where is the difference?”

The truth is: screw & barrel is not a simple commodity. The price is determined by multiple technical factors, especially:

• steel material selection
• machining accuracy and tolerance control
• heat treatment quality
• surface treatment (nitriding)
• bimetallic alloy layer (wear-resistant liner)

If you only compare the quotation number, you may end up paying more later through downtime, scrap, and frequent replacement.

Let’s explain the real reasons behind the price difference.

1) Steel Material: Not All “38CrMoAl” Is the Same

Most standard screw & barrel are made from nitriding steel such as 38CrMoAlA. But even with the same steel name, quality can differ due to:

• different steel suppliers and purity
• different forging quality
• different internal structure and stability
• different mechanical properties after treatment

For demanding applications, upgraded materials may be required, especially when processing:

• high filler compounds (CaCO₃)
• glass fiber reinforced plastics
• recycled plastics with impurities
• corrosive materials

External link: Basic overview of nitriding steel and surface hardening
https://www.sciencedirect.com/topics/engineering/nitriding

2) Machining Accuracy: Precision Directly Impacts Performance

High precision machining is not “extra cost for nothing.” It determines:

• correct screw-barrel clearance
• stable melt pressure and output
• reduced leakage and backflow
• lower vibration and better running stability

Poor machining can lead to:

• unstable output
• pressure fluctuation
• higher scrap rate
• early wear and failure

Internal link (product): High Precision Screw & Barrel
https://juyuan-machinery.com/screw-barrel/

3) Heat Treatment: The Hidden Key to Service Life

Heat treatment is one of the biggest reasons why two screws look similar but perform very differently.

A professional heat treatment process improves:

• core strength and toughness
• resistance to deformation under high torque
• stable hardness distribution
• long-term performance under high temperature

Low-quality heat treatment may cause:

• bending or deformation
• cracking risk
• unstable hardness
• short service life

In many cases, heat treatment quality is the “invisible difference” behind the price.

4) Nitriding Process: Depth and Hardness Matter

Nitriding is commonly used for standard screw & barrel. But nitriding quality depends on:

• nitriding depth
• surface hardness level
• process stability and control
• final polishing and finishing

A shallow or unstable nitriding layer wears out quickly, leading to:

• rapid clearance increase
• unstable output
• frequent maintenance

If you want stable production, nitriding quality must be controlled seriously.

Internal link (product): Nitrided Screw & Barrel
https://juyuan-machinery.com/nitrided-screw-barrel/

5) Bimetallic Alloy Layer: The Biggest Upgrade for Wear Resistance

If you process abrasive or corrosive materials, a bimetallic barrel can make a huge difference.

A bimetallic barrel includes an alloy inner liner designed to resist:

• abrasion from fillers (CaCO₃, glass fiber)
• corrosion from additives and recycled materials
• high-speed, high-output wear conditions

This is why bimetallic barrels cost more—but they often provide:

• much longer service life
• more stable output
• fewer shutdowns and lower downtime risk

Internal link (product): Bimetallic Screw Barrel
https://juyuan-machinery.com/bimetallic-screw-barrel/

The Real Question: Cheap Price or Low Cost per Ton?

A low price is attractive, but the real goal is low cost per ton.

If a cheaper screw & barrel causes:

• frequent replacement
• unstable product quality
• downtime and lost production
• high scrap rate

then it becomes more expensive in the long run.

A higher-quality screw & barrel can deliver:
✅ stable production
✅ consistent quality
✅ longer service life
✅ fewer shutdowns
✅ better profit per month

How We Help Customers Choose the Right Solution

At Zhoushan Juyuan Machinery Co., Ltd, we provide screw & barrel solutions based on real production needs—not only price competition.

We support customers with:

• material recommendation based on application
• high precision machining and inspection
• reliable heat treatment and nitriding control
• wear-resistant bimetallic options for heavy-duty production
• custom screw design for output and stability improvement

Internal link (service): Custom Screw Design & Manufacturing
https://juyuan-machinery.com/custom-screw-barrel/

Contact Us (Fast Reply)

Chen Xiujiang
Zhoushan Juyuan Machinery Co., Ltd
🌐 Website: https://juyuan-machinery.com/
📧 Email: cxj.job@gmail.com
📱 Phone/WhatsApp/WeChat: +86 13905808474

If you received very different quotations and want to understand the real differences (material, process, heat treatment, alloy liner), contact us today. We will help you choose the most cost-effective screw & barrel solution for your production.