5140 Mechanical Structure Tube
5140 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 5140 Mechanical structure tube is a high-strength alloy steel tube designed for a wide range of mechanical applications. Known for its excellent combination of tensile strength, durability, and machinability, 5140 steel is commonly used in the automotive, construction, and manufacturing industries. This tube is ideal for use in applications that require superior performance under demanding conditions, including high stress, pressure, and wear.
Chemical Composition:
Carbon (C): 0.38–0.43%
Manganese (Mn): 0.60–0.90%
Chromium (Cr): 0.80–1.10%
Molybdenum (Mo): 0.15–0.25%
Silicon (Si): 0.20–0.35%
These alloying elements provide 5140 steel with its characteristic properties, such as improved hardenability, high tensile strength, and resistance to wear and tear. The addition of chromium and molybdenum enhances its corrosion resistance and toughness, making it suitable for applications where strength and reliability are paramount.
Mechanical Properties:
The 5140 mechanical structure tube exhibits a variety of beneficial mechanical properties that make it suitable for use in high-performance applications. These properties include:
Tensile Strength: Approximately 850–1000 MPa (megapascals), depending on the heat treatment.
Yield Strength: Around 450–550 MPa.
Elongation: Typically 16–20% in 50mm.
Hardness: Brinell hardness value of approximately 170–200 HB.
These characteristics ensure that 5140 steel tubes maintain their structural integrity even under significant mechanical stress, making them ideal for use in heavy-duty applications such as gear shafts, crankshafts, and suspension components in the automotive industry.
Applications:
5140 steel tubes are used in a variety of mechanical structures, including but not limited to:
Automotive Components: Crankshafts, connecting rods, axle shafts, and gear shafts.
Industrial Machinery: Gearboxes, hydraulic cylinders, and machine parts that require high strength and resistance to wear.
Construction Equipment: Parts of heavy machinery that are subject to high stress and load-bearing applications.
The 5140 mechanical structure tube is particularly useful in industries where the components are subject to high-impact forces, such as the automotive and construction sectors. The material’s ability to withstand stress and fatigue makes it ideal for components that need to function reliably over long periods under harsh conditions.



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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