4140 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.

4140 Precision Seamless Steel Tube is a high-strength alloy steel tube manufactured through advanced cold drawing or cold rolling processes to achieve outstanding mechanical performance, precise dimensional tolerances, and superior surface quality. Made from AISI 4140 steel, this tube offers an excellent combination of toughness, fatigue resistance, and wear resistance, making it an ideal material for applications requiring high strength and precision in automotive, hydraulic, mechanical, and energy industries.

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Material Overview

AISI 4140 is a chromium-molybdenum alloy steel known for its high tensile strength, good hardenability, and excellent impact resistance. It contains approximately 0.40% carbon, 1.0% chromium, and 0.2% molybdenum, giving it superior mechanical properties even under high-stress or high-temperature conditions. After heat treatment (such as quenching and tempering), 4140 steel provides exceptional hardness, toughness, and fatigue strength, making 4140 precision seamless tubes ideal for demanding mechanical and structural applications.

Manufacturing Process

The production of 4140 precision seamless tubes begins with high-quality hot rolled seamless pipes, followed by precise cold drawing or cold rolling to refine dimensions and enhance surface finish. The process involves:

• Cold drawing/cold rolling to achieve tight dimensional control.
• Heat treatment (annealing or normalization) to improve ductility and relieve internal stress.
• Straightening and sizing to ensure perfect concentricity and uniform wall thickness.
• Surface finishing (bright annealed, phosphated, or oiled) to prevent corrosion and improve appearance.
• These processes produce high-precision seamless tubes with excellent roundness, consistent wall thickness, and a smooth surface free from oxidation or scale.

Features

• High dimensional accuracy: Outer diameter tolerance up to ±0.05 mm.
• Excellent mechanical properties: High tensile and yield strength, suitable for high-load environments.
• Superior toughness and fatigue resistance: Ideal for dynamic or cyclic loading applications.
• Good machinability: Suitable for cutting, drilling, threading, and welding.
• Smooth surface finish: Ensures efficient hydraulic flow and minimal friction.

Application

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.

• Automotive industry: Drive shafts, axles, gear components, and suspension systems.
• Hydraulic and pneumatic systems: hydraulic cylinder barrels, precision pistons, and pressure fittings.
• Mechanical engineering: Machine tool spindles, shafts, gears, and rollers.
• Oil and gas industry: Drilling tools, connectors, and structural supports.
• Heavy machinery: Construction, mining, and agricultural equipment components.

Their high fatigue strength and excellent surface finish ensure superior performance in critical mechanical and hydraulic applications.​​​

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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