S355 Precision Seamless Steel Tubes

Product description:

Precision seamless pipe is a type of steel pipe formed by punching through round steel, with no welds on the surface. According to the production method, seamless steel pipes are divided into hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, and hot-expanded seamless steel pipes. Seamless steel pipes are classified into two types based on their cross-sectional shape: circular and special-shaped.

S355 Precision Seamless Steel Tube is a high-performance structural steel tube manufactured through advanced cold drawing or cold rolling processes to achieve exceptional dimensional accuracy, smooth surface finish, and superior mechanical strength. Made from S355 low-alloy high-strength structural steel, these precision tubes are widely used in mechanical engineering, construction machinery, automotive systems, and hydraulic applications, where strength, precision, and reliability are essential.

Parameters:

Pictures:

Material Overview

S355 steel is a non-alloy structural steel defined under EN 10025 and EN 10210/EN 10305 standards. It typically contains 0.22% carbon, 1.6% manganese, and trace amounts of silicon and phosphorus, offering an excellent balance of strength, ductility, and weldability. The “S” stands for structural, and “355” represents a minimum yield strength of 355 MPa, making it suitable for load-bearing and high-stress applications.

S355 precision seamless tubes are preferred for lightweight yet strong structures, combining mechanical strength with precision dimensional control.

Manufacturing Process

The production of S355 precision seamless steel tubes begins with high-quality hot rolled seamless pipes, which undergo cold drawing or cold rolling to achieve tighter dimensional tolerances and a smoother surface. The process involves:

Cold drawing/cold rolling: Reduces wall thickness and diameter under strict control.

Heat treatment (normalizing or annealing): Improves ductility and relieves internal stress.

Straightening and sizing: Ensures uniform wall thickness and excellent concentricity.

Surface finishing: Produces bright, polished, or phosphated finishes for corrosion resistance.

The final product is a precision tube with consistent mechanical properties and superior surface quality suitable for high-precision engineering uses.

Features

• High dimensional accuracy: Outer diameter tolerance up to ±0.05 mm.
• Excellent weldability and formability: Suitable for complex fabrication processes.
• Superior strength-to-weight ratio: Provides structural strength with reduced material weight.
• Smooth internal and external surfaces: Ideal for hydraulic and pneumatic systems.
• Reliable mechanical performance: Uniform hardness, ductility, and fatigue resistance.
• Customizable dimensions and finishes: Available in bright annealed, oiled, or phosphated surfaces.

Application

• Mechanical engineering: Shafts, rollers, machine frames, and precision components.
• Construction machinery: Boom arms, frames, and high-strength structural parts.
• Automotive industry: Axles, chassis components, and steering systems.
• Hydraulic and pneumatic systems: hydraulic cylinder barrels, piston rods, and pressure lines.
• Energy and offshore sectors: Transmission pipelines, offshore platforms, and support structures.

Their high strength and accuracy make them ideal for modern engineering systems that demand both load capacity and precise dimensional control.

The application scope of seamless steel pipes is very wide, including structures, fluid transportation, low to medium pressure boilers, high-pressure boilers, fertilizer equipment, petroleum cracking, geological drilling, diamond core drilling, petroleum drilling, ships, automotive half-shaft sleeves, diesel engines, etc. The use of seamless steel pipes will ensure no leakage problems, guarantee the usage effect, and improve material utilization. It can be seen that the application of seamless steel pipes mainly covers three major fields. The first is the construction field, which can be used for underground pipeline transportation, including extracting groundwater during construction. The second is the processing field, which can be used for mechanical processing, bearing sleeves, etc. The third is the electrical field, including gas pipelines and fluid pipelines for hydropower generation.

Why us?

We focus on the research, development, production and sales of seamless steel pipes, special-shaped steel pipes and hydraulic cylinders. We have a complete production chain and an advanced equipment system, including piercing machines, cold drawing machines, hot rolling machines, high-precision flaw detection and testing equipment. The company has passed multiple authoritative certifications such as ISO9001, API, SGS, CCS, DNV, ABS, CE, RoHS, etc., ensuring that each product complies with international standards. We are committed to providing customers with high-quality, customizable solutions to meet diverse application needs.

Relying on our own built processing base and modern workshops, combined with multiple branches and storage centers across the country, we have achieved sufficient inventory and efficient logistics coordination, significantly shortening the delivery cycle and ensuring the rapid delivery of orders.

We have established a complete service and support system. After the order is signed, the professional after-sales team can provide timely and safe on-site guidance and technical support to ensure that customers are at ease throughout the process from procurement to use.

FAQ:

1. Do you support customized design and production?

Sure. We have a professional engineering team that can conduct customized design and production with special sizes, control systems or OEM according to your requirements.

2. How fast can you deliver?

In stock sizes, it takes 3-5 days. For customized sizes, it takes 30-35 days.

3. What payment methods do you support?

We support TT payment. Generally, 30% to 50% of the payment is made in advance, and the remaining amount is paid before shipment.

4. Can you provide material certification (MTC)?

Yes, we will provide MTC to you after production is completed to ensure that the material quality meets the standards.

5. What is the minimum order quantity?

Generally, we accept trial orders. The minimum order quantity is 1-3 tons, which can be determined according to different products.

Certification:

Packaging and Transportation:

Packaging and Transportation: