A519 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.

A519 precision seamless steel tube is a high-quality mechanical steel tube manufactured according to the ASTM A519 standard, designed for precision applications that demand superior mechanical strength, dimensional accuracy, and surface quality. Produced using advanced cold drawing or cold rolling technology, A519 precision seamless tubes are widely used in automotive, hydraulic, mechanical, energy, and construction industries where strength, reliability, and precision are essential.

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Standard Overview

ASTM A519 covers seamless carbon and alloy steel mechanical tubing used for machining, mechanical parts, and structural components. These tubes are supplied in various conditions—hot finished or cold drawn—to meet specific engineering requirements. The standard applies to grades such as 1020, 1045, 4130, 4140, 4340, and other carbon or alloy steels, ensuring consistent performance under dynamic and high-stress conditions.

A519 precision seamless steel tubes are valued for their tight dimensional tolerances, uniform mechanical properties, and smooth surface finish, which make them ideal for precision machining and assembly.

Manufacturing Process

The production of A519 precision seamless steel tubes begins with solid round billets that are heated and pierced to form hollow tubes. These are then cold drawn or cold rolled to achieve the desired dimensions and surface finish. The process includes:

• Cold drawing/cold rolling – reduces diameter and wall thickness with precision.
• Heat treatment (normalizing or annealing) – enhances ductility and relieves internal stress.
• Straightening and sizing – ensures perfect roundness and uniform wall thickness.
• Surface treatment – produces bright, polished, or phosphated finishes to improve corrosion resistance.
• The final product is a high-precision seamless tube with excellent mechanical integrity, roundness, and smoothness.

Features

• High dimensional accuracy: Outer diameter tolerance up to ±0.05 mm.
• Excellent mechanical properties: High tensile and yield strength for structural integrity.
• Superior surface finish: Smooth, bright inner and outer surfaces.
• Good machinability: Ideal for precision cutting, drilling, and threading.
• Versatile material grades: Available in carbon and alloy steel grades for varied industrial needs.
• Customizable specifications: Produced in different sizes, wall thicknesses, and lengths as required.

Application

• Automotive industry: Drive shafts, steering columns, and suspension systems.
• Hydraulic and pneumatic systems: hydraulic cylinders, pistons, and pressure lines.
• Mechanical engineering: Shafts, rollers, machine tools, and mechanical structures.
• Energy sector: Oil and gas equipment, power generation, and heat exchangers.
• Construction and machinery: High-strength structural supports and precision frameworks

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.

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