Monthly Archives: May 2014

Differences between Hot Rolled Coil and Cold Rolled Coil

Before souring steel materials for a project, you should to know the differences between the different types of steel, How it is used and what are the advantages and disadvantages. Then you can make a decision and choose the right product for your project.

Below we will discuss a pretty common question: what’s the different between Hot Rolled Steel and Cold Rolled Steel, their advantage and disadvantage, etc

Cold Rolled Steel and Hot Rolled Steel

1 , Differences in rolling process:

Hot rolling is a metallurgical process that mainly to produce steel sheet or Steel Plate, after being passed between a set of work rolls, the billets are simply deformed or cut into steel plate, and the rolling temperatures would be over 1,000 degrees Fahrenheit.

Cold rolling is another metal working process at temperatures that are close to normal room temperature, deform metal by passing it through rollers. Cold rolling often used to decrease the thickness of steel plate or steel sheet, and increase the metal’s yield strength and hardness.

2 , Advantage and disadvantage: Hot Rolled Steel vs. Cold Rolled Steel

The cold rolled steel is more precise dimensionally than a hot rolled product that created by hot rolling process, The cold rolled steel has already gone through the cooling process, which help it closer to the finished dimension.

However, the shapes of cold rolled steel is limited because of these properties, round, square, flat and variations of those types of shapes. If with small transverse dimension and uniform cross section, other shapes can also be cold rolled.

During the cooling process, Hot rolled steel re-configures itself, which giving the finished product looser tolerances than the original material. Compared with cold rolled steel products, Hot rolled steel is more malleable, allowing it to be forced into a variety of different shapes.

3 Cost of Hot Rolled Steel vs. Cold Rolled Steel

Generally, the cost of cold rolled steel could be twice as much as the cost of hot rolled steel, as cold rolling is a More complex metal working process than hot rolling

There is also another finishing between hot rolling process and cold rolling process, Pickled and Oiled. By being pickled in acid and oiled, the mill scale on the hot rolled steel can be removed and protect it from rusting. Picking and oiling cost is somewhere in between regular hot rolling and cold rolling.

4 usage of Hot Rolled Steel and Cold Rolled Steel

Hot rolled steel always used to create larger size products, as those larger products need to be in more distinct shapes. Hot Rolled Coil is produced as a feedstock for Cold Rolled Coil and coated coil, but also for immediate use in a variety of industrial applications including Steel Tubes used in transport, shipbuilding, construction, gas containers, pressure vessels and energy pipelines.

And Smaller products need to be more durable and tolerant, always created by the Cold Rolled Steel. Cold Rolled Steel is a ‘flat’ steel product. The material is manufactured from Hot Rolled Steel, with further thickness reduction performed on a strip mill without the use of heat. The application of cold rolled steel including: Automotive components, Bathtubs, Construction and building components, Domestic appliances, Electrical goods, Furniture, etc

If you are still not so sure about what kind of steel can meet your project requirements, please feel free to contact us, our professional sales engineer will help you, offer you advice and suggestions, our best solutions for your reference.

How to Select a Steel Supplier from China

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How to find the best steel coil suppliers in China? This is your first time to source H Beam steel or IPE steel products from China? Do you want to find some useful tips or experiences? If your answers are Yes, then you are in the right place.

It’s important for you to find and buy only the best quality materials from hundreds and thousands of Chinese steel Supplier, with reasonable steel prices , whether you’re the owner of a trading company or running a manufacturing business. Keep in mind that the end result is only a product of what you put into it.

Before searching a steel company in China, there are Two things you should always in mind: High quality steel products and good reputation for services. Below are the factors that would guide you answer your questions, and help you find a steel supplier with high quality products and good services:

Production facilities

In Steel Industry, the steel products’ quality of a mill provided mainly depends on their facilities. As you know, Steel is a high volume product, it is improbable to check all the products’quality. That’s why it is important to find the right kind of Iron & Steel making route and right equipments to produce for you. Some of the common facilities including: Ladle Refining furnace, Continuous casting / Ingot Casting, Rolling, Finishing Facilities.

Quality Control

Quality control can be achieved With higher levels of automations and by complying with efficient quality systems. You can check whether the company have any certifications of factory management and quality control assurance, ISO9001, ISO14001 for example. A steel mill gets accredited to ISO or other various renowned quality standards and private quality standards, then a quality control system is in place. Please note that the quality control is related with all departments, not only the quality control department. This attitude will ensure reduction of defective steel products

Good Services

Your suppliers would like to provide you a steel solution? or just sell products? Steel plants should always make themselves as a steel solution provider, rather than steel producer and sellers. A sales with good services would offer you some suggestions, help you saving cost. As a buyer, you have to check how customer friendly of the sales is and how your orders are taken care of. There are lots of steel plants with good facilities and products, but with poor sales team and bad attitude.It will take some time to find a sales team with fully support, but it is worth to do that. Understand each other, trust each other, enjoy a long term win-win cooperation.

There are another better and easier way for you to judge the level of a steel supplier’s product quality and their services: Check the company’s reputation of their past dealing for references, check their existing clientele. but you should know every customer have different needs, you should know your market and your position.

The Difference between Galvanized Steel and Galvalume Steel

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With the sustained and stable development of China’s national economy, the galvanized steel and galvalume steel has been in rapid growth, and in the field of international trading, China steel prices also attract large amount of requirements of them.

The main difference between galvanized steel and galvalume is the plate coating. Surface of galvanized steel evenly distributed the layer of zinc materials, which plays the role of anodic protection for base material, that means corrosion of zinc material give the protection of the base material , and only when all the zinc coating is corroded ,can harm done to the base metal inside. Galvalume coating surface is made from 55% aluminum, 43.5% zinc and a little amount of other elements. Galvalume coating is of a honeycomb structure under microscopic circumstance .The “honeycomb”, which is made of aluminum, contains all the zinc .In this case, the galvalume coating also plays the role of anodic protection, but with the decrease of the zinc amount, and the zinc material covered by aluminum, the anodic protection reduced greatly. So once the galvalume steel sheets are cut, the cutting edge without protection will soon be corroded. So should galvalume sheets be cut less, and zinc-rich paint or anti-rust paint applied to the cutting edge could be able to increase the life of the steel sheets.

The surface of galvalume sheet is more beautiful than galvanized sheet, while the galvalume sheet is much more expensive than galvanized sheet, and the price of small spangle is more expensive than large spangle.

In a rainy and humid city, once corrosion occurs at some point on galvalume sheet, it will spread increasingly on whole board if you do not take measures timely to slowly rust; while galvanized rust not spread if it occurs at a point.

Even a galvalume with greatest quality cannot overcome this shortcoming. Therefore, when we propose customers of the galvanized products, we will explain to customers the difference between them, if they require galvalume products, then we can only try to use corrosion paint immediately once it is cut.

What is Angle Iron?

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Angle Iron, also commonly known as angle steel, is a 90 degree folded flat metal along its length. With equal length of the 2 sides of the angle, we called it “Equal steel Iron”, otherwise, we called it “Unequal Steel Iron”. Its specifications expressed in “Edge width * Edge width × Edge Thickness”. “∠30×30×3″ for example, it means the edge width of Steel Iron is 30mm, and the thickness is 3 mm.

Applications of Angle Iron

According to the different needs, Angle Iron often used as structural element in building, bridge, Transmission tower, Lifting and transport machinery, or for variety of supports, such as bed frame, Warehouse shelves, etc.

application of angle iron

Factors that affect angle iron prices

Size of Angle iron, The type and grades of Steel are normal factors that impact prices of Steel Iron. Other factors like shipping cost, import & export clearance fees should also considered if you want to buy Angle Iron from China steel suppliers.

1．Depends on your projects or intended applications, you need different dimensional size and thickness of Angle Iron, the Typical size range: 20×20-200×200, 0.3mm-25mm Thick, 6m-13m Long. With more steel is used to create a larger Angle Iron, the price will increase accordingly, Normally, your suppliers will provide you the prices based on the weight of Angle iron.

2．The type of steel used to produce Angle iron can also impact the prices because the cost of the steel types varies greatly. Galvanized angle iron with hot-dip galvanized (zinc) coatings need more labor and process, which will cost much more money. And those cost will be added onto the prices.

3．If you import angle iron from China, you may also consider to adding boron into angle iron. By adding boron, China Steel suppliers can get a 9% to 13% tax rebate for a number of products, which makes huge differences on the price . The difference can up to 100 USD/MT. You can save more cost by importing angle iron from private mills instead of State owned mills.

Contact us now to get more ideas about how to choose the right type of angle iron for your projects and how to saving cost by importing angle iron from China.