Yijin Industry Co. , Ltd is an enterprise specializing in the production, sales and import and export of metal materials. The company's products include steel, Stainless steel,aluminum alloy, copper alloy, nickel-based alloy and other metal materials, which are widely used in aerospace, automobile, construction, electronics, machinery and other fields.
Our company has advanced production equipment and a professional technical team to ensure the high quality and stability of products. At the same time, the company also pays attention to environmental protection and sustainable development, adopts environmental protection technology in the production process, and strictly abides by national and international environmental protection regulations.
Why Choose Us
Rich Experience
Adhering to the business philosophy of "quality first, reputation first", Yijin is committed to providing high-quality metal materials and high-quality services to global customers.
Professional Team
The company has a complete after-sales service system and a professional technical support team, which can respond to customer problems and needs in a timely manner, provide customers with beneficial technical guidance and solutions, and enhance customer loyalty and satisfaction.
High Quality
The company continuously strives to promote the construction of products and brands, actively carries out publicity activities, and establishes a good corporate image and brand image. At the same time, the company also pays attention to improving product quality. Through continuous improvement of technology and process, the competitiveness of products and market share have been improved.
Quality Control
We have established long-term and stable cooperative relations with many well-known domestic and foreign steel mills, aluminum factories and other metal material manufacturers, and has a stable supply capacity of a large number of high-quality raw materials, reducing procurement costs. It can also provide customers with better product quality assurance.
-
DIN EN 10025-2 - European Standards
Products Description DIN EN 10025-2 is an important European standard that governs the
Add to Inquiry -
Products Description JIS G3106 steel plate also offers excellent formability. It can be easily
Add to Inquiry -
JIS G3131 Hot-roll Mild Steel Plates
Products Description JIS G3131 Hot-roll mild steel plates are widely known for their exceptional
Add to Inquiry -
Products Description Steel Plate JIS G3101 is a widely used and highly regarded steel product with
Add to Inquiry -
Products Description ASTM A709 steel plate is a widely recognized and highly specified material
Add to Inquiry -
Products Description ASTM A284 steel is a versatile and widely used material with a range of
Add to Inquiry -
ASTM A283 steel plate is a widely used structural steel product with several notable
Add to Inquiry -
ASTM A573 Steel Plate Grade 58, 60,65,70
Products Description ASTM A573 steel plate grades 58, 60, 65, and 70 are widely recognized for
Add to Inquiry -
SM 400B steel is a widely used structural steel with remarkable properties. This steel grade is
Add to Inquiry -
Products Description SM41A steel is a remarkable material with numerous outstanding
Add to Inquiry -
Products Description SM400A steel plate is a high-quality product with excellent performance.
Add to Inquiry -
Furthermore, Q235C steel plate's consistent quality and performance make it a trusted choice
Add to Inquiry
It is easy to identify hot rolled steel by the bluish tint that it often has to it from the rolling process. By being rolled in the extremely high temperatures, hot rolled steel loses many of the properties of cold rolled steel. This makes it a lower tolerance to outside pressures and makes it more malleable. Because of this increased flexibility, is far easier for hot rolled steel to take on a variety of shapes.
Due to its flexibility, hot rolled steel is highly sought out after as a structural component. This includes things like “I” beams and railroad tracks. Another popular use, due to its flexibility, is to craft it into sheet metal. While it is not as strong as the other, hot rolled steel is extremely useful for its ability to bend.
High Strength and Durability
One of the standout features of hot-rolled steel is its strength and durability. Hot-rolled steel is much stronger than cold-rolled steel because it has a higher carbon content. This makes it an ideal choice for applications that require a high load-bearing capacity, such as bridges, large structures, and heavy machinery. The strength of hot-rolled steel also means it is more resistant to wear and tear and can be used in high-stress areas.
Excellent Formability
Hot-rolled steel is renowned for its excellent formability. This is due to the processes it undergoes. The heating and cooling cycles of hot rolling the steel, along with the pressure applied during the process, create much more malleable steel than cold-rolled steel. The resulting product is easier to bend, shape, cut, and weld than cold-rolled steel. This makes this steel the preferred choice of engineers and manufacturers when creating structural components, such as beams, pipes, and tubing.
Cost-Effective
Hot-rolled steel is one of the most cost-effective steel products available today. This is because hot rolling involves reheating steel billets at high temperatures, which is much simpler than cold rolling. This makes production costs much lower and, in turn, makes hot-rolled steel a much more cost-effective option. Additionally, hot rolling allows for the production of larger quantities of steel in a much shorter timeframe, making it an ideal choice for large-scale projects.
Versatile
Hot-rolled steel can be used in a wide range of applications due to its excellent properties, including its strength, durability, and formability. Some common applications of hot-rolled steel include construction materials, automotive parts, and industrial equipment.
What Are the Most Common Hot-Rolled Steel Grades?
A36
This low carbon steel is between 0.25% and 0.29% carbon by weight. The composition of the metal makes it easy to machine and weld, and it has excellent strength and mechanical characteristics during its lifespan. In fact, it’s named “A36” steel because its minimum yield tensile strength is 36,000 psi. This is an ASTM-designated steel.
C1010 and C1018
These two grades of hot rolled steel are very low carbon. C1010 steel is composed of 0.08% to 0.13% carbon by weight, and C1018 ranges between 0.14% and 0.20% carbon by weight. These low carbon amounts make the two metals very structurally similar, though the minute differences result in slight differences in tensile strength and ductility. Manufacturers can easily form, machine, and weld these metals. Common applications include fasteners, bolts, and tubing.
C1045
This AISI-designated metal is between 0.42% and 0.50% carbon by weight, making it a medium carbon steel. This metal is stronger than most other metals on this list, and the carbon increases its responsiveness to heat treatments like quenching and annealing. C1045 steel is primarily used for structural components due to its high strength.
A572
A572 is a high strength, low alloy steel plate that is produced in Grades 42, 50, 55, 60 & 65, with each grade signifying the material’s yield strength. This metal is used for a range of structural applications, such as buildings, bridges, rail parts and more.
A588
This metal, also known as weathering steel. is a corrosion-resistant, high-strength, low-alloy steel plate. Due to its resistance to atmospheric corrosion, it is often used for welding, riveting or bolting in construction applications, primarily for bridges and buildings.
Microalloyed Steel
This through-hardened material contains 0.05 to 0.15% alloying elements used to refine the grain microstructure. Its yield strength is between 40 and 110 ksi with good weldability.
Construction Materials
Hot-rolled steel is commonly used in construction due to its high strength and durability. It is often used to create structural components, such as beams, columns, and girders, as well as for roofing and wall cladding.
Automotive Parts
Hot-rolled steel is also widely used in the automotive industry due to its excellent formability and strength. It is commonly used to create parts such as car frames, wheels, and exhaust systems.
Industrial Equipment
Hot-rolled steel is also used in a wide range of industrial applications, including the manufacturing of heavy machinery, equipment, and tools. It is often used to create parts such as gears, bearings, and shafts.
Agriculture
Hot-rolled steel is also used in the agriculture industry for various applications, including the manufacturing of farm equipment, such as plows and harrows.
Cold Rolled Steel vs Hot Rolled Steel Main Differences
Appearance and Surface Quality
The edges and surfaces of hot rolled steel are usually rough. This is because cooling from extreme temperatures leaves remnants on the steel surface, making it look scaly. Thus, such surfaces may require decarburization or other surface treatments to prepare the steel for subsequent operations.
On the other hand, cold rolled steel has a smooth and shiny surface since it does not involve using very high temperatures. Thus, cold rolled steel is ideal for use in production operations without any surface treatments.
Recrystallization Point
When comparing hot rolled vs cold rolled steel, one of the major points to consider is the recrystallization point. Cold rolling occurs when the metal material is able to form “new grains.” The rolling and bending of the metal often destroy old grains. Cold work on steel may reduce its strength, so manufacturers add a final step of annealing. This process involves heating the steel to 1,333 – 1,400 degrees Fahrenheit (just above the recrystallization point of steel).
Cooling of the steel occurs very slowly without bringing it to room temperature too quickly. This way, the metal can create a uniform microstructure to reset its grains. In contrast, the processing of hot rolled steel occurs at above 1700 degrees Fahrenheit, which is higher than the recrystallization point of steel. This condition is necessary for the easy forming and shaping of the metal.
Steel Strength and Hardness
Material strength and hardness also help mentioned earlier, the process of forming cold rolled steel gives a uniform microstructure. This process helps to create metal with higher strength and hardness. It is not too hard, however, making it easily malleable.
The hot rolling process, on the other hand, involves extreme heat and rapid cooling, preventing the stress from regaining its grains. Thus, the resulting metal has more liver strength and hardness than cold rolled steel.
Internal Stresses
Steel strength and hardness significantly impart internal stresses on the material. Therefore, cold rolled steel with greater strength and hardness has greater internal stresses than hot rolled steel. It is crucial to relieve such stresses before processing the material to prevent the warping of the final product.
Distortions
Hot rolled steel experiences slight distortions (e.g. through sheet metal bending) because the cooling process gives slightly trapezoidal shapes and forms. Cold rolled steel has perfectly squared angles with well-defined corners and edges. The tubes formed also have excellent concentric uniformity and better straightness.
Quality Control Measures in Hot Rolled Coil Steel Production
In-line inspection techniques during the rolling process
During the production of hot rolled coil steel, meticulous quality control measures are implemented at multiple stages to ensure the integrity and reliability of the final product. In-line inspection techniques play a crucial role in identifying any potential defects that may occur during the rolling process.
One such technique is in-line ultrasonic testing, which involves the use of high-frequency sound waves to detect internal defects within the steel. Ultrasonic testing is conducted by directing sound waves into the material being inspected and analyzing the reflected waves.
This non-destructive testing method allows for precise detection of flaws such as voids, cracks, or inclusions that may affect the structural integrity of the hot rolled coil steel. By identifying these defects early on, manufacturers can take necessary corrective actions to prevent further processing or eliminate faulty coils from reaching customers.
Surface inspection using cameras
In addition to ultrasonic testing, surface inspection using sophisticated cameras is an integral part of quality control in hot rolled coil steel production. These cameras are equipped with advanced imaging technology that captures high-resolution images of every inch of the steel’s surface. The images are then analyzed by trained professionals who meticulously examine them for surface defects or irregularities.
By employing this method, manufacturers can identify imperfections such as scratches, pits, scale remnants, or any other anomalies that might compromise the visual appearance or performance characteristics of the hot rolled coil steel. Surface inspection significantly enhances overall product quality and helps maintain customer satisfaction by ensuring that only top-notch coils with impeccable surfaces are delivered.
The Manufacturing Process Behind Hot Rolled Steel
In the world of steel production, hot rolled steel is a common term that you've likely come across. Whether it's in construction, manufacturing, or even in your daily life, such steel plays a crucial role.
Slab Selection & Heating
The journey of hot rolled steel begins with the selection of high-quality metal slabs, which are fed into a Reheating Furnace, where the slabs are heated in a furnace to extreme temperatures, often exceeding 2,200 degrees Fahrenheit (1,204 degrees Celsius), based on the type of steel grade being rolled.
Primary Descaling
When the slabs exit the furnace, the slabs are covered with oxide layer which needs to be removed before rolling. Descaling involves high-pressure water jets (220 Bar) that clean the surface and prepares it for further processing.
Rolling
Once the slab is descaled, it passes through a series of rollers. These rollers exert tremendous pressure, reducing the thickness of the steel slab and rolling to long steel strips.
Laminar Cooling
Before the steel strip is rolled to coils, the steel strip is cooled by a laminal water stream in the hot rolling mill. This helps to stabilize the steel's microstructure, achieving the required properties.
Coiling
The steel strip is then coiled for further processing or dispatched directly to our customers.
Our Factory
The company's import and export business volume has increased year by year and has become one of the company's important businesses. Adhering to the tenet of "quality first, customer first", the company continuously improves service levels and product quality to meet market demand and customer expectations, and contribute to the development of the metal material industry.
FAQ
As one of the leading hot-rolled steel suppliers in China, we warmly welcome you to wholesale bulk high-grade hot-rolled steel in stock here from our factory. All metal materials are with high quality and competitive price.
Inconel800H, CuSn8, HC380LA