Phosphated Tubes: Enhancing Corrosion Resistance and Paint Adhesion

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Phosphated tubes have become a crucial component in various industries, offering exceptional corrosion resistance, superior paint adhesion, and an appealing appearance. In this article, we will delve into the world of DIN/EN black phosphated precision seamless steel tubes, exploring their features, technical characteristics, applications, and the manufacturer behind these innovative solutions.

Xuzhou Global Precision Steel Tube Co., Ltd: Crafting Customized Tubes

At the heart of the phosphated tubes industry lies Xuzhou Global Precision Steel Tube Co., Ltd, a leading manufacturer specializing in producing customized steel tubes. Their extensive product range includes:

A. Galvanized Tube

B. Phosphated Tube

C. Bright Precision Steel Tube

D. Passivated Tube

With a focus on delivering tailored solutions for the automotive, engineering machinery, railway locomotive, ships, and hydraulic systems, Xuzhou Global Precision Steel Tube Co., Ltd has earned a reputation for quality and innovation.

Key Features of Phosphated Tubes

Phosphated tubes, specifically DIN/EN black phosphated precision seamless steel tubes, offer a host of advantages that make them invaluable in various industries. Here are some key features:

1. Black Phosphated Coating

These tubes are coated with black phosphate on both sides, providing a layer of protection that enhances their durability.

2. Delicate Coating

The phosphated coating is delicate, with high lubricity and uniform color. This ensures a smooth surface that meets the highest quality standards.

3. Aesthetic Appeal

Phosphated tubes are not only functional but also visually appealing. Their good-looking appearance adds an element of sophistication to the end product.

4. Corrosion Resistance

One of the standout features of phosphated tubes is their high resistance to corrosion and rust. This makes them ideal for applications in harsh environments.

5. Paint-Friendly

Phosphated tubes have excellent paint adhesion properties, allowing for strong bonding when painted or spray-treated.

Technical Characteristics of Phosphated Tubes

Understanding the technical aspects of these tubes is crucial for their successful integration into various applications:

1. Standard

Phosphated tubes adhere to international standards, including DIN2391/C (EN10305-1), EN10305-4 (DIN2445), and SAE J524.

2. Grade

They are available in various grades, such as E235 (ST35, ST37.4), E255 (ST45), and E355 (ST52).

3. Heat Treatment

Phosphated tubes undergo NBK (+N) normalization to ensure consistent quality.

4. Surface Treatment

They feature a bright surface finish, achieved through cold drawing.

5. Straightness

Phosphated tubes maintain a high level of straightness, with a deviation of 10μm per meter.

6. Delivery Conditions and Packaging

To meet the diverse needs of customers, phosphated tubes are delivered in various conditions:

a. Goods: NBK (+N)

b. Packaging: Both ends are sealed with plastic caps, bundled with plastic film, and wrapped in woven bags. Each bundle can weigh up to 1000 kg.

c. Length: Tubes are typically supplied in fixed 6-meter lengths or as per customer requirements.

Applications of Phosphated Tubes

These versatile tubes find applications in a wide range of industries, including:

1. Engineering Machinery: Phosphated tubes offer durability and corrosion resistance, making them suitable for various components in engineering machinery.

2. Ships: Their resistance to rust and corrosion makes phosphated tubes essential for marine applications.

3. Precision Machinery: These tubes play a vital role in precision machinery due to their high-quality surface finish and corrosion resistance.

4. Hydraulic and Pneumatic Systems: The consistent quality and resilience of phosphated tubes make them a preferred choice in hydraulic and pneumatic systems.

Furthermore, the surface of phosphated precision steel tubes is especially well-suited for painting or spray treatment. The strong adhesion of paint enhances the appearance and significantly improves rust prevention.

Product Advantages and Quality Assurance

Phosphated tubes from Xuzhou Global Precision Steel Tube Co., Ltd offer several advantages:

1. Anti-Rust: They exhibit high corrosion resistance, ensuring longevity even in challenging environments.

2. Total Phosphating: Phosphating is applied both inside and outside the steel pipe, offering comprehensive protection.

3. Delicate Coating: The phosphated coating is delicate, offering high lubricity and uniform color.

4. Exterior Aesthetics: Phosphated tubes are visually appealing, adding an attractive element to your products.

5. Painting Compatibility: These tubes are suitable for painting and exhibit strong paint adhesion.

Product Video: Quality Assurance

Xuzhou Global Precision Steel Tube Co., Ltd ensures the quality of their phosphated tubes through various processes:

phosphated tubes

1. Cold Drawn/Cold Rolled: This process guarantees high dimensional accuracy and excellent internal and external wall finish.

2. Eddy Current Testing: Each steel pipe undergoes eddy current flaw detection to ensure product quality.

3. Anaerobic Bright Heat Treatment (NBK): This treatment preserves the original rolling accuracy and smoothness of the steel pipe while enhancing its mechanical properties and metallographic structure.

4. Surface Treatment (Phosphated): High-quality phosphating treatment on both the inner and outer walls creates a uniform and dense crystal structure. This improves corrosion resistance, and adhesion during painting, and plastic spraying.

Streamlining the Process: Steps to Wholesale Bulk Phosphated Tubes

Step 1: Identify Your Requirements

Before diving into the wholesale process, it’s crucial to have a clear understanding of your specific requirements. Determine the quantity of phosphated tubes you need, the dimensions, and any specific specifications required for your application. Xuzhou Global Precision Steel Tube Co., Ltd. offers customized solutions, so make sure you communicate your needs clearly.

Step 2: Contact the Manufacturer

Once you’ve defined your requirements, reach out to Xuzhou Global Precision Steel Tube Co., Ltd. You can contact their sales team through their official website or other communication channels provided. Provide them with all the necessary details, including the quantity, specifications, and delivery timeline.

Step 3: Request a Quotation

After contacting the manufacturer, request a detailed quotation for the bulk phosphated tubes you need. The quotation should include the price per unit, shipping costs, and any other applicable charges. Make sure to clarify any doubts and negotiate terms if necessary.

Step 4: Quality Assurance

Quality is paramount when it comes to industrial products. Xuzhou Global Precision Steel Tube Co., Ltd is known for its commitment to producing high-quality phosphated tubes. Before finalizing your order, inquire about their quality control processes. Ensure that their products meet the required industry standards and specifications.

Step 5: Lead Time and Production Schedule

Discuss the lead time and production schedule with the manufacturer. Knowing when you can expect the delivery of your bulk phosphated tubes is essential for your project planning. Xuzhou Global Precision Steel Tube Co., Ltd. values punctuality and strives to meet delivery deadlines.

Step 6: Payment Terms

Clarify the payment terms with the manufacturer. Discuss the payment methods they accept and the schedule for payments. Make sure you are comfortable with the terms before proceeding.

Step 7: Place Your Order

Once you are satisfied with the quotation, quality assurance, lead time, and payment terms, proceed to place your order. Ensure that all the details are accurately documented in the purchase order.

Step 8: Inspection and Acceptance

When you receive the bulk phosphated tubes, conduct a thorough inspection to ensure they meet your specifications and quality standards. If there are any discrepancies or issues, communicate them with the manufacturer promptly.

Step 9: Storage and Handling

Properly store and handle the phosphated tubes to prevent damage or corrosion. Follow the manufacturer’s guidelines for storage and handling to maintain the product’s integrity.

Step 10: Feedback and Future Collaboration

After successfully receiving and using the bulk phosphated tubes, provide feedback to the manufacturer. This helps them improve their services and products. Building a positive working relationship can lead to future collaborations and a reliable source for your industrial tubing needs.


DIN/EN black phosphated precision seamless steel tubes have become a cornerstone in various industries, thanks to their exceptional features, technical characteristics, and applications. With Xuzhou Global Precision Steel Tube Co., Ltd. at the helm, these tubes continue to provide innovative solutions for a wide range of industries, enhancing product quality and performance. Whether in automotive, engineering machinery, or hydraulic systems, phosphated tubes have proven their worth in protecting and enhancing the products they become a part of.