Steel is an alloy formed after being heated in an oven at high temperatures. This is an extremely important material that creates strength and durability in large or small projects and ensures absolute safety for life and property.

Steel is widely used and popular in a variety of fields: building, apartments, high-end serviced apartments, shipbuilding, machine manufacturing, etc. It is an indispensable part when you have an important project that you want to carry out and are in progress. Choosing the wrong type or using the wrong size means it will cause bad conditions, unpredictable dangerous situations.

There are many different types of steel, with a variety of types and sizes depending on the field and needs you want to buy. So what is the difference between CB300 and CB400 Rebar?

1. Mechanical properties:

The symbol CB represents the level of durability that steel brings, C is the abbreviation for grade, and B is the abbreviation for durability. The number 300 is often called the limit of steel or also means the strength of steel.

- CB300 represents steel with a strength of 300 N/mm2, which means that an rebar with a cross-section of 1 mm2 will withstand a tensile or compressive force of about 300N (equivalent to 30kg).

- CB400 has a strength of 400 N/mm2, corresponding to a CB400 rebar with a cross-section of 1 mm2 will withstand a tensile or compressive pressure of about 400N (equivalent to 40kg)

Under the impact of the environment with harsh oxidation conditions, the parameters of the steel will reflect to the user how resistant they are.

According to TCVN 1651 - 2018 standard, the yield strength of CB300 rebar is 300 N/mm2, the breaking strength is 450 N/mm2, the relative elongation is 19% and can be bent 180 degrees.All genuine CB400 rebar products comply with the basic standard TCVN 1651 -2018. According to TCVN 1651 - 2018 standard, the yield strength of CB400 is 400 N/mm2, the breaking strength is 570 N/mm2, the relative elongation is 14% and can be bent 180 degrees.

2. Application:

The two types of steel CB300 and CB400 have good tensile strength and high durability, so they are widely used in construction works in Vietnam. However, CB300 is suitable for construction works smaller than 7 floors (houses, apartments...).

CB300 steel products have sufficient mechanical strength, so they are often chosen for these works. As for residential works higher than 7 floors, projects, choosing products with CB400 becomes mandatory, because these works require steel products with high strength and durability.

3. Price:

Each different brand will have different prices for CB300 and CB400 steel products. But in general, there is not much difference between the steel brands between these two product lines. The price of CB400 steel is usually higher than the price of CB300 steel by about 100,000 VND - 200,000 VND/ton.

Nhan Luat Corporation specializes in distributing a variety of high-quality, durable steel products that are commonly used in many fields, and has many years of experience importing and supplying steel to meet customer needs.

Customers and partners who are interested in and looking for a reputable, quality steel supplier, please contact us for quotation!