China made Q690E carbon steel plate sheet properties

The toughness index of Q345B steel should be tested by impact test at 20 ℃. Although the strength of Q345B steel and Q345A steel are the same, the S / P control of Q345B steel is more strict, and the ambient temperatures of Q690E carbon steel plate sheet, Q345B steel and Q345A steel are different. The cold impact test refers to the impact test at a certain temperature to obtain the energy consumed by punching the specimen. The more energy consumed, the higher the toughness of the material. Q345A is not subject to impact test. So Q345B steel is better than Q345A steel.

Based on the main Q690E carbon steel plate sheet business of iron and steel, we are committed to producing high-quality, green and efficient steel products. The main steel products are medium and heavy plate, hot rolled coil, section steel, steel tube, etc., which are widely used in automobile, oil, railway, bridge, construction, electricity, transportation, machinery, shipbuilding and other important fields. Our steel Q690E carbon steel plate sheet products are exported to Indonesia, Bangladesh, Myanmar, Iran, Brazil, Mexico, UAE, Iraq, etc Egypt, Mozambique, Ukraine and other dozens of countries and regions.

As the thickness and hardness of Q690E carbon steel plate sheet increase, the tendency to crack at the cutting edge increases. In order to prevent the Q690E carbon steel plate sheet from cutting cracks, preheating should be carried out before Q690E carbon steel plate sheet cutting. Special attention should be paid to preheating to make the entire Q690E carbon steel plate sheet interface evenly heated to avoid local overheating in the area contacting the heat source. If the whole Q690E carbon steel plate sheet cannot be preheated, the partial preheating method can be used instead.

After the steel plate is produced from the original factory, it will pass through a series of transportation and storage links and then be delivered to the processing workshop. During this period of time, the steel plate surface will contact with the air continuously, which will inevitably produce a layer of oxide skin. The oxide skin is a difficulty in the treatment process. It has high melting point, is not easy to burn and dissolve, increases preheating time, reduces cutting speed. Therefore, the surface of the Q690E carbon steel plate sheet plate should be derusted before cutting.

Our company will accept the product quality objection registration record, pass it to the Q690E carbon steel plate sheet production unit and relevant departments, and timely coordinate the supervision of product Q690E carbon steel plate sheet quality objection. Our company coordinates the relevant department personnel to the customer unit to carry on the investigation, the processing.