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The brand name S355MC is derived from the European standard EN 10149 and is often seen in domestic corporate standards. The M in the grade refers to thermomechanical controlled rolling, which is equivalent to what we often call TMCP (thermomechanical control process), which is used by all major domestic steel mills. TMCP: A technology that obtains a good structure and significantly improves the strength and toughness of the material by reasonably controlling various parameters such as billet heating temperature, rolling temperature, deformation amount, deformation rate, final rolling temperature and post-rolling cooling process.S355MC is a European standard high yield strength cold forming automotive steel. It is mainly used in the field of automotive reinforcements and structural parts and has high product added value.

The steel grades of the S315MC to S700MC series are used for cold-formed components of the most varied designs. Their fields of application include the manufacture of : – Longitudinal beams – Frames – Cold-pressed parts – Cold-rolled sections – and Structural pipes The user of these steel grades must make sure that his calculation, design and processing methods are appropriate for the material. The forming process used must be suitable for the intended application and comply with the state-ofthe-art; it is of fundamental importance to the processing behaviour of these steel grades. These steel grades offer excellent bending, flanging, cold-bordering and folding properties in both longitudinal and transverse direction. The bending radii specified below should be observed as minimum values.If agreed in the order, the notch impact energy is proved using longitudinal samples at -20 °C. The average notch impact energy from 3 samples must be 40 J minimum. One individual value may fall short of the required minimum value by not more than 30 %. The sample width shall equal the product thickness if the latter is between 6 and 10 mm. The tests are performed by using samples similar to Charpy-V samples. The required minimum values are to be reduced proportionally to the sample width.

Normalised and stress relief annealing above 580 °C with long holding times results in a reduction of yield strength and tensile strength as compared to the ‘asdelivered’ condition which is why such heat treatments should be avoided. It also follows that these steel grades are not suitable for hot-forming. If low-voltage annealing is necessary to compensate the welding stresses, the recommended annealing time between 530 °C and 580 °C is 30 minutes for all product thicknesses and steel grades.These steel grades can be welded both manually and using automatic equipment by means of all electrical welding processes provided the general technical rules are observed. No major hardness increases appear in the heat-affected zone. Preheating is not necessary under normal welding conditions and down to workpiece temperatures of +5 °C. Below +5 °C, pre-heating to 150 °C is recommended. The welding wires and electrodes approved in the respective strength category must be used as filler metals. In addition to this, the general meaning of the detailed information provided in ‘Stahl-Eisen-Werkstoffblatt’ (Iron and steel material sheet) 088 must be observed.

S355MC pickled plate is a high-quality carbon structural steel plate. After pickling treatment, the surface shows a uniform luster and has good physical properties. The physical properties of S355MC pickling plate will be introduced in detail below. First of all, S355MC pickled plate has high strength and toughness. Its yield strength reaches 355MPa, and its tensile strength is as high as 470-630MPa, which means that it can withstand large external forces without plastic deformation. At the same time, its elongation is also very high, reaching 22%, which allows it to absorb more energy when subjected to external force and has better impact resistance. Secondly, S355MC pickled board has good weldability and processability. It can be connected through various welding methods, such as manual arc welding, gas shielded welding, etc., and the quality of the welded joints is stable and can meet the needs of various structural connections. In addition, it can be formed through various processing methods such as cold bending, hot rolling, and shearing. The processed parts have high dimensional accuracy and good surface quality. Thirdly, S355MC pickled plate has good corrosion resistance. After pickling treatment, most of the iron oxide scale and impurities are removed from the surface, reducing the source of corrosion. At the same time, the chemical composition of S355MC pickled plate has also been optimized and contains appropriate amounts of chromium, nickel and other alloying elements, which can improve the corrosion resistance of the steel and enable it to maintain stable performance in various environments. In addition, S355MC pickled plate also has good low-temperature toughness. In low-temperature environments, its impact toughness can still maintain a high level and will not become embrittled due to lower temperatures, so it is suitable for use in various cold areas. Finally, S355MC pickled plate also has good wear resistance and fatigue resistance. In the case of high-speed operation or frequent loading, it can maintain a long service life, reduce the frequency of maintenance and replacement, and reduce the cost of use.

To sum up, S355MC pickled plate, as a high-quality carbon structural steel plate, has high strength, high toughness, good weldability, processability, corrosion resistance, low temperature toughness, wear resistance and fatigue resistance. and other excellent physical properties. These properties make S355MC pickled plates widely used in bridges, construction, machinery manufacturing, ships, vehicles and other fields. In the future development, with the continuous advancement of science and technology and the continuous improvement of technology, the physical properties of S355MC pickling plate will be further optimized and improved, providing more reliable and efficient material support for the development of various industries.

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