Q345qC steel plate is the steel plate of bridge structure, the implementation standard is GB / T 714-2015 standard. A36 hot rolled carbon steel coil, Q345qC-Z25 steel: Q represents the yield strength, 345 represents the small yield strength, the unit is MPa, q is short for the bridge, C quality grade, corresponding to the corresponding impact temperature and impact work value, Z is the Z-direction performance that is the performance of the steel plate thickness direction, Z25 is the Z-direction Performance level requirements.
The sulfur element (S element) comes from the ore and fuel coke of steelmaking. It is a harmful element in A36 hot rolled carbon steel coil etc. steel. Sulfur exists in steel in the form of iron sulfide (FeS). FeS and Fe form a low melting point (985℃) compound. The hot working temperature of steel is generally above 1150 - 1200℃, so when the steel is hot working, the premature melting of FeS compound causes the workpiece to crack, which is called "hot brittleness". It reduces ductility and toughness of steel and causes cracks during forging and rolling. Sulfur is also detrimental to welding performance and reduces corrosion resistance.
Cutting speed directly affects the stability of A36 hot rolled carbon steel coil cutting process and the quality of cutting section. If you want to artificially increase the cutting speed to improve production efficiency and reduce the cutting speed to best improve the quality of the cutting section, it is impossible, can only make the cutting section quality worse.
In March, the daily output of key iron and steel enterprises fell on a month on month basis, while the overall inventory of A36 hot rolled carbon steel coil and so on steel materials was lower but still at a high level. In terms of production, in March, according to the key statistics, the cumulative average daily output of pig iron, crude steel and steel for iron and steel enterprises was 1.824 million tons, 1.695 million tons and 1.766 million tons respectively, down 2.1%, 3.1% and 1.7% on a month on month basis.
