Ones355j2Introduction to steel plates1. S355J2 belongs to the European standard alloy plate, which is a low-alloy high-strength structural steel with good impact toughness and welding function, which is equivalent to the national standard Q345D.
2. S355J2 steel plate grade indicates:
s": represents European standard steel plate;
355": indicates the yield strength of the steel plate 355, unit: MPa;
J2": indicates the quality level of the steel plate, and the -20 impact test is made.
3. S355J2 steel plate implementation standard: EN10025-2:2004 (European standard).
4. S355J2 steel plate delivery status: mostly delivered in hot rolled state, but also according to technical requirements to specify the delivery status.
5. S355J2 steel plate thickness direction performance requirements: Z15, Z25, Z35.
6. S355J2 steel plate size: thickness 8-150mm, width 1600-2500mm, length 6000-12000
7. S355 series corresponds to the national standard level.
S355JR steel plate is equivalent to the national standard Q355B grade;
S355J0 steel plate is equivalent to the national standard Q355C level;
S355J2 steel plate is equivalent to the national standard Q345D grade;
S355K2 steel plate is equivalent to the national standard Q355E grade.
Second, S355J2 steel plate production process and process:
S355J2 is a commonly used structural steel plate material, which is mainly used in construction, bridges, machinery and other fields. The following is the general production process and process of S355J2 steel plate:
1.Raw material preparation: First of all, it is necessary to prepare raw materials suitable for the production of S355J2 steel plate, including molten iron and additives for smelting.
2.Melting: The raw materials are added to the furnace for melting, and the furnace temperature and atmosphere are controlled to make the alloy composition meet the design requirements.
3.Casting: Molten steel is poured into a pre-prepared mould and cooled and cured in an appropriate manner to form a preliminary casting billet.
4.Heat treatment: Heat treatment of the casting billet, including processes such as heating, heat preservation and cooling, to adjust the structure and performance.
5.Hot rolling or cold rolling: The heat-treated billet is hot-rolled or cold-rolled, and the billet is gradually pressed into a steel plate of appropriate thickness by controlling the rolling force and rolling temperature.
6.Surface treatment: pickling, derusting and processing are carried out on the surface of the steel plate after hot or cold rolling to improve the surface quality.
7.Cutting: According to the size requirements of the customer's needs, the steel plate is cut to obtain a finished product that meets the requirements.
8.Inspection: Conduct quality inspection on the cut steel plate, including appearance quality, dimensional accuracy, chemical composition and mechanical properties.
9.Packing and storage: Pack the qualified S355J2 steel plate and store it properly in the warehouse for subsequent use or shipment.
3. Chemical composition of S355J2 steel plate:
Carbon content (c): no more than 022%
Silicon content (Si): not more than 055%
Manganese content (mn): not more than 160%
Phosphorus content (p): no more than 0035%
Sulfur content(s): not more than 0035%
Molybdenum content (mo): no more than 010%
Copper content (Cu): not more than 055%
Chromium content (cr): not more than 030%
Nylon content (Ni): not more than 030%
Titanium content (Ti): no more than 003%
S355J2 steel plate performance parameters:
S355J2 steel plate is a commonly used structural steel plate, which has the following performance parameters:
1.Strength: The yield strength of S355J2 steel plate is 355MPa, and the tensile strength is 510-680MPa. This gives it a high strength when subjected to large loads and pressures.
2.Toughness: S355J2 steel plate has good toughness and is able to work at low temperatures. It is able to absorb impact energy and has high fracture toughness.
3.Corrosion resistance: S355J2 steel plate has good corrosion resistance, which is suitable for applications in marine environment and chemical media.
4.Weldability: S355J2 steel plate is easy to weld, can be connected by common welding methods, and has good strength and toughness after welding.
5.Machinability: S355J2 steel plate is easy to process, including cutting, upsetting, drilling, bending and other process operations.
It should be noted that the above performance parameters may vary according to specific product standards and production processes, and it is recommended to refer to the relevant material specifications and technical information provided by the manufacturer before actual use.