Introduce
Precision Tubes are high-precision, high-surface-finish seamless or welded steel tubes manufactured through cold rolling, cold drawing, or precision rolling processes. They feature tight dimensional tolerances (within ±0.05mm) and excellent surface quality (roughness Ra ≤0.8μm). Available in materials such as carbon steel, alloy steel, stainless steel (e.g., 304, 316), and non-ferrous metals, they meet diverse performance requirements across industries.
Product Description
| Type |
seamless |
| Steel Grade |
customized |
| Tolerance |
±1% |
| Steel Grade |
310S, 316Ti, 316L, 316, 430, 304, 304J1 |
| Surface Finish |
Polishing, Hair line,Pickling,NO.1,etc |
| Invoicing |
by actual weight |
| Place of Origin |
Shandong, China |
| Delivery Time |
15 Day |
| Processing Service |
Bending, Welding, Moulding, Cutting, Punching, Decoiling |
| Application |
architecture, agriculture, industry, decoration |
| Surface |
Customers't Requirement |
| Technique |
Cold Rolled |
| Size |
Customized Size |
| Shape |
Round Shape |
| Standard |
bs EN GB AISI ASTM DIN JIS |
| Packaging Details |
In bundles with waterproof material, in wooden cases or as customers' requirements |
High precision
They have high dimensional accuracy. The outer diameter tolerance can generally be controlled within ±0.05mm, and the wall
thickness tolerance can reach ±0.05mm or even higher precision, which can meet the processing requirements of various
high-precision equipment and components.
Good surface quality
Both the inner and outer surfaces have a high finish. The roughness usually can reach Ra0.2-Ra1.6μm, and there are no obvious
defects on the surface, such as cracks, laps, pitting, etc., which is beneficial to improving the corrosion resistance of the
pipeline and the fluid conveying efficiency.
Applications
Automobile Manufacturing
Engine: Precision tubes are used in the manufacturing of the fuel injection system, turbocharging system, and cooling system pipelines of engines. Their high-precision inner and outer diameters ensure the precise delivery of fuel, lubricating oil, and coolant, enhancing the performance and reliability of the engine.
Transmission: In automatic transmissions, precision tubes are used as oil pipes for the hydraulic control system. They need to withstand high pressure and ensure the precise control of oil flow to achieve smooth gear shifting of the transmission.
Chassis System: Precision tubes are also used in the shock absorbers and power steering systems of automobiles. The precision tubes in shock absorbers serve as guiding components for piston movement and require high-precision inner diameter dimensions and good surface quality to ensure the performance and service life of the shock absorbers.
AerospaceAero
Engine: The fuel system, lubrication system, and hydraulic system of aero engines all require a large number of precision tubes. These precision tubes need to operate under extreme conditions of high temperature, high pressure, and high rotational speed, so extremely high requirements are placed on the material properties, dimensional accuracy, and surface quality of the tubes.
Aircraft Hydraulic System: The landing gear retraction and extension, flight control systems, etc. of aircraft all rely on the hydraulic system to provide power. As the pipelines of the hydraulic system, precision tubes must have the characteristics of high strength, corrosion resistance, and high precision to ensure the reliable operation of the hydraulic system.
Precision Instruments
Medical Equipment: In high-end medical equipment such as CT scanners and magnetic resonance imaging (MRI) devices, precision tubes are used to manufacture various high-precision components, such as the casings of X-ray tubes and the support structures of detectors. These devices have extremely high requirements for precision, and the application of precision tubes can ensure the stability and accuracy of the equipment. Industrial Automation Equipment: Precision tubes also play an important role in key components such as sensors and actuators in automated production lines. For example, the cylinders in pneumatic actuators usually use precision tubes as the cylinder barrels to ensure the smooth movement of the piston and precise position control.
Electronic Industry
Semiconductor Manufacturing Equipment: In the chip manufacturing process, a large number of high-precision gas delivery pipelines and liquid delivery pipelines are required. Precision tubes can meet the strict requirements of semiconductor manufacturing processes for pipeline precision, cleanliness, and corrosion resistance, ensuring the precise delivery of process gases and chemical liquids.
Heat Dissipation of Electronic Equipment: Some high-performance electronic devices, such as servers and high-end graphics cards, use precision tubes to make heat dissipation pipes to ensure heat dissipation effects. By circulating the coolant inside the pipes, the heat generated by the electronic components can be quickly dissipated.
Hydraulic Systems
Industrial Hydraulic Equipment: In various industrial production equipment, such as injection molding machines, die-casting machines, machine tools, etc., the hydraulic system is a key component for realizing power transmission and motion control. As the oil pipes of the hydraulic system, precision tubes can withstand the impact of high-pressure oil, ensuring the tightness of the oil and the accuracy of flow control.
Construction Machinery: The hydraulic systems of construction machinery such as excavators, loaders, and cranes also use a large number of precision tubes. These devices operate in harsh working environments, and the hydraulic system needs to have high reliability and stability, and the application of precision tubes can meet these requirements.
Other Fields
High-pressure Boilers: In high-pressure boilers in the power industry, high-precision seamless steel tubes are required to transport high-temperature and high-pressure steam and water. The high quality and precision of precision tubes can ensure the safe operation of the boiler and improve the heat exchange efficiency.
Offshore Engineering: In fields such as offshore oil extraction and offshore wind power, the marine environment is characterized by high corrosion and high pressure. After special anti-corrosion treatment, precision tubes can be used to manufacture the pipelines of the hydraulic systems of offshore platforms, the pipelines of seawater desalination equipment, etc., and can withstand the corrosion of seawater and the effect of high pressure.
Production process
1,Blanking Preparation
Raw Material Selection: High-quality carbon steel or alloy steel is usually selected as the blank. Common materials include 10#, 20#, 45# steel, etc. According to different usage requirements, special materials such as stainless steel are also used. The quality of the raw materials directly affects the performance and quality of the precision tubes. Therefore, strict inspections should be carried out on the raw materials, including chemical composition analysis and mechanical property testing.
Tube Blank Cutting: According to the required length and specifications of the precision tubes, the selected steel blanks are cut into appropriate lengths. The cutting methods usually include sawing and shearing. Sawing has higher precision but relatively lower efficiency; shearing has high efficiency, but it may produce certain burrs and deformations at the cut, which require subsequent treatment.
2,Heating
The cut tube blanks are heated to an appropriate temperature, generally around 1000 - 1200°C. The purpose of heating is to reduce the deformation resistance of the steel and improve its plasticity, so that plastic deformation can be carried out smoothly in the subsequent piercing and rolling processes. Common heating equipment includes pusher-type reheating furnaces and walking-beam reheating furnaces. During the heating process, the heating temperature and time should be strictly controlled to avoid defects such as overheating and burning.
3,Piercing
A piercing machine is used to pierce the heated tube blank into a hollow mandrel. The main types of piercing machines include cross-rolling piercing machines and push-rolling piercing machines. During the piercing process, the tube blank rotates and moves forward under the action of the rolls, and at the same time, it is affected by the axial force of the plug, gradually forming a hollow mandrel. In the piercing process, parameters such as the rotational speed of the rolls, the feed angle, and the position of the plug should be well controlled to ensure the quality of the mandrel and avoid defects such as internal and external folds and out-of-tolerance ovality.
4,Pickling
The surface of the pierced mandrel usually has a layer of scale, which needs to be removed by pickling. Pickling generally uses acid solutions such as sulfuric acid and hydrochloric acid. The mandrel is immersed in the acid solution, and the scale reacts chemically with the acid and dissolves in the acid solution. After pickling, the surface of the mandrel should show a metallic luster without obvious residual scale. After pickling, the mandrel also needs to be washed with water and neutralized to remove the residual acid solution on the surface to prevent the acid solution from affecting the subsequent processing equipment and product quality.
5,Cold Drawing or Cold Rolling
Cold Drawing: The pickled mandrel is drawn through a series of dies from small to large, so that its diameter and wall thickness gradually decrease to reach the required precision dimensions. During the cold drawing process, the mandrel undergoes plastic deformation under the action of the die, and its structure is further refined, thus improving the strength and surface quality of the tube. The cold drawing process can produce precision tubes with high precision and high surface finish, but the production efficiency is relatively low, which is suitable for the production of small batches of high-precision products.
Cold Rolling: Cold rolling is to roll the mandrel through a multi-pass cold rolling mill to further improve the dimensional accuracy and surface quality of the tube. During the cold rolling process, the tube undergoes continuous plastic deformation under the action of the rolls, and its precision control is more accurate and the surface quality is better. The cold rolling process has high production efficiency and is suitable for the production of large batches of high-precision products, but the equipment investment is relatively large.
6,Heat Treatment
According to the material and usage requirements of the precision tubes, heat treatment is carried out on the tubes after cold drawing or cold rolling. Common heat treatment processes include annealing, normalizing, quenching, and tempering. Annealing can eliminate the residual stress inside the tube, reduce the hardness, and improve the plasticity and toughness; normalizing can refine the grains and improve the strength and toughness of the tube; quenching and tempering are usually used in combination to obtain good comprehensive mechanical properties. During the heat treatment process, parameters such as the heating rate, holding time, and cooling rate should be strictly controlled to ensure the heat treatment effect.
7,Straightening
The tubes after cold drawing, cold rolling, and heat treatment may have certain bending and deformation, and need to be straightened by straightening equipment. There are many straightening methods, such as pressure straightening, tension straightening, and roller straightening. Roller straightening is one of the most commonly used methods. It repeatedly bends and straightens the tube through multiple rollers to make the tube meet the required straightness requirements. The straightness of the straightened tube should comply with relevant standards and customer requirements.
8,Finishing
Cutting: According to the length required by the customer, the tube is cut into fixed lengths using cutting equipment. The cutting methods include sawing, plasma cutting, laser cutting, etc. Sawing is suitable for cutting with general precision requirements, and plasma cutting and laser cutting have higher precision but relatively higher costs.
Chamfering: Chamfering treatment is carried out on both ends of the cut tube to facilitate subsequent assembly and use. The chamfer angle and size are usually processed according to the customer's requirements.
Surface Treatment: According to the needs, further surface treatment is carried out on the precision tube, such as polishing, electroplating, painting, etc. Polishing can improve the surface finish and aesthetics of the tube; electroplating can improve the corrosion resistance and wear resistance of the tube; painting can play the role of anti-corrosion and decoration.
9,Inspection
Dimensional Accuracy Inspection: Measuring tools such as calipers, micrometers, and outside diameter measuring instruments are used to measure the outside diameter, inside diameter, wall thickness, length, and other dimensions of the tube to ensure that the dimensional deviations are within the specified range.
Surface Quality Inspection: Through visual inspection or using equipment such as a surface roughness tester, check whether there are defects such as cracks, scratches, pitting, and scale on the surface of the tube, and whether the surface roughness meets the requirements.
Mechanical Property Inspection: According to relevant standards and customer requirements, carry out tensile tests, hardness tests, impact tests, etc. on the tube to detect whether the mechanical properties such as strength, hardness, and toughness of the tube meet the usage requirements. Metallographic Structure Inspection: Observe the metallographic structure of the tube through a metallographic microscope, check the grain size, whether the structure is uniform, and whether there are abnormal structures. The quality of the metallographic structure directly affects the mechanical properties and corrosion resistance of the tube.
10,Packaging and Warehousing
The precision tubes that pass the inspection are packaged according to the customer's requirements. Generally, packaging materials such as plastic film, steel strips, and wooden boxes are used for packaging to prevent the tubes from being damaged and corroded during transportation and storage. The packaged tubes are stored in the warehouse and wait for delivery.
Company Profile
Shandong Meide Import and Export Co., LTD was established in 1997. Located in Liaocheng City, Shandong Province, the largest steel logistics center in North China.We are a Chinese company with over 25 years of forging experience.Our focus is on using high-efficiency electro-hydraulic hammer facilities to produce free forged and open-die forged products.We are proud of our independent quality assurance laboratory, which ensures that all of our products meet our customers' requirements. We have passed ISO9001:2000 quality system certification, SGS, ROSH, TUV and REACH certification. Has cold rolling, hot rolling and other production lines. Such as heat treatment chemical analysis, metal halide testing, physical testing, nondestructive testing and other testing equipment and testing technology, imported physical and chemical testing equipment full spectrum direct reading spectrometer, can quickly and accurately chemical analysis of all kinds of metal materials. According to American ASTM standard, Japanese JIS standard, German DIN standard, British BS standard and other standards production. At the same time, we can customize and develop new products according to the actual application of customers, and provide products for different cost and performance requirements. The company cooperates with more than 20 well-known steel mills in China, and has established modern large outdoor warehouse and indoor warehouse, with 20,000 tons of goods in stock. The customer base covers all provinces and cities in China, and has more than 100 long-term stable cooperative customers. We warmly welcome and look forward tocooperating with you!
Certifications
Packaging & Shipping
Packaging.
Waterproof paper steel ring standard airworthiness export packaging; Packing seaworthy wooden case packing.
Make sure all the goods are delivered to you. If you have any requirements, you can also contact us.
Transportation.
We ship goods from Qingdao, Tianjin ports. You can designate other ports as required.
Our delivery time is within 7-15 days. If the quantity is very large or special circumstances occur, it may be longer.
FAQ
1.Are you trading company or manufacturer ?
We are factory.
2.What do I need for offering a quote ?
Please offer us 2D or 3D drawings (with material, dimension, tolerance, surface treatment and other technical requirement etc.),quantity, application or samples. Then we will quote the best price within 24h.
3.What is the production cycle?
It varies a lot depending on product dimension,technical requirements and quantity. We always try to meet customers'requirement by adjusting our workshop schedule.
4.What kind of payment terms do you accept?
T/T, L/C, Escrow, paypal, western union, moneygram etc.
5.Do you provide samples ? is it free or extra ?
Yes, we could offer the sample.But it is not for free.
6.How do you control your quality?
We request QC inspect every productions links for each bacth goods.And we can provide you MTC and mill certificate when the goods is finished.
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