4140 Mechanical Structure Tube
4140 Mechanical structure tube 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.

The 4140 Mechanical structure tube is a type of alloy steel tube commonly used in various industrial applications, particularly in the automotive, construction, and manufacturing sectors. This steel is known for its robustness, strength, and versatility, making it an ideal choice for mechanical and structural purposes. The tube is typically manufactured using a combination of carbon, chromium, molybdenum, and manganese, which gives it excellent mechanical properties such as high tensile strength, good fatigue resistance, and wear resistance.

Composition and Properties

4140 steel is a medium-carbon alloy steel that contains 0.40% carbon, along with chromium (Cr) and molybdenum (Mo), which significantly improve its mechanical properties. The typical chemical composition of 4140 steel is:

Carbon (C): 0.38-0.43%

Manganese (Mn): 0.75-1.00%

Chromium (Cr): 0.80-1.10%

Molybdenum (Mo): 0.15-0.25%

Silicon (Si): 0.20-0.35%

Phosphorus (P): ≤0.035%

Sulfur (S): ≤0.035%

This combination of alloying elements ensures that 4140 tubes offer excellent hardenability, meaning they can be heat-treated to achieve desired levels of hardness and strength. When hardened and tempered, the 4140 steel tube achieves a tensile strength of up to 100,000 psi (690 MPa) and a yield strength of 60,000 psi (415 MPa).

Additionally, 4140 tubes exhibit good toughness, wear resistance, and the ability to withstand high-impact stress, which makes them suitable for demanding applications in harsh environments.

Manufacturing Process:

The process of producing 4140 mechanical structure tubes generally involves several stages, including:

Steel Making

The first step is producing the 4140 steel itself by combining the alloying elements in an electric arc furnace or an induction furnace. The raw material is melted and refined to achieve the desired composition.

Forming the Tube Shape

Once the steel is prepared, it is formed into tubular shapes through processes such as extrusion, rotary piercing, or welding, depending on the tube's diameter and wall thickness.

Heat Treatment

After the tubes are formed, they undergo heat treatment to enhance their mechanical properties. Common heat treatments for 4140 steel include quenching, tempering, and annealing. These treatments improve the tube's strength, hardness, and overall performance.

Finishing and Inspection

After heat treatment, the tubes are subject to finishing processes such as surface grinding, polishing, and cutting to meet specific dimensional requirements. Quality control is essential, and tests such as tensile strength, hardness, and ultrasonic testing are conducted to ensure the tube's performance and reliability.

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.

Certification:

Packaging and Transportation: