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.

Product: 4140 Mechanical structure tube

Brand: Hengxin Zhicheng

Standards: ASTM, GB, ISO, etc. of various countries

Material/Steel Grade: 10 #, 20 #, A335, A53(A, B), A106(B, C), A179-C, ST37, ST42, ST35.8, St42-2, St45-8, S355, 10 #-45 #, A53-A369, ST35-ST52, AISI 1020/1045/1050, C75, S45C, P11, P12, etc.

Length: Can be made from 0.1m to 15m, customized according to customer requirements

Wall Thickness: Can be made from 1mm to 150mm

Outer Diameter: Can be made from 4mm to 1600mm

Surface: Can be painted, galvanized, oiled, etc.

Technology: Hot rolling, cold rolling, cold drawing, forging, hot expansion

Port: Shanghai Port or designated port

Packaging Details: Default bare pipe bundling, or packaging according to customer requirements, such as oil cloth packaging, wooden box packaging, frame packaging

Processing Services: Cutting, chamfering, painting, polishing, anti-corrosion, sealing

Payment Terms: Telegraphic Transfer

Trade Terms: EXW, FOB, CIF, DAP, DDP

Delivery Time: 10 to 35 days

Application Fields: Construction (underground pipelines, bridges, steel structure factories, etc.), mechanical processing (automobile parts, equipment manufacturing, etc.), electrical field (gas transmission pipelines, oil pipeline pipes)

Usage: For automotive parts, hardware components, steel structures, etc

Pictures:

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.

Applications:

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.

Company profile:

Since its establishment in 2014, Wuxi Hengxin Zhicheng Co., Ltd. has rapidly grown into a leading enterprise in the steel manufacturing industry. We focus on the research, production and sales of seamless steel pipes, Special-shaped steel pipes and hydraulic cylinders, and are committed to providing customers with high-quality, customizable products that fully meet diverse application needs.

Our products are exported to global markets such as the Middle East, South America, Africa, and Southeast Asia, and are highly trusted by large purchasers and customers in the steel industry. We always prioritize quality, reliability and customer service, and attach great importance to establishing long-term and stable cooperative relationships with customers. We provide each customer with tailor-made solutions.

We continuously promote technological innovation and improve service capabilities and production efficiency. Through an efficient online platform, you can browse our best-selling products at any time and communicate with the sales and support teams in real time to conveniently obtain the information you need. We sincerely invite partners from all countries to visit, exchange and provide guidance, and jointly explore more possible cooperation opportunities!

Certification:

Packaging and Transportation:

【Package standard】

We use steel bands to tightly package the products into hexagonal bundles. The structure is stable and not prone to deformation. Each bundle is equipped with two high-strength nylon straps to ensure the safety and convenience of the lifting operation.

To meet various maritime transportation needs, we offer a range of customized packaging options, including full coverage with oilcloth, moisture-proof wooden boxes, and high-strength protective frame packaging, to ensure the maximum safety of goods during transportation.

【Guarantee for transportation】

We offer 20-foot and 40-foot standard container transportation services. Each container can carry up to 25 tons of goods and we can accept trial orders with a minimum of 5 tons. This allows for flexible adaptation to your purchasing scale. All packaging complies with maritime shipping standards to ensure that the goods are delivered to the destination efficiently and safely.

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.