Centerway Steel Co., Ltd
Centerway Steel Co., Ltd
Centerway Steel Co., Ltd
carbon steel plate,steel coil,stainless steel plate,china export service provider.
carbon steel plate,steel coil,stainless steel plate,china export service provider.
In simple terms, cold-rolled stainless steel plates have a bright, smooth, and attractive surface, while hot-rolled stainless steel plates have an industrial, rough surface that feels more tactile.
Hot rolling involves using slabs (mainly continuous casting slabs) as raw materials, which are heated and then rolled by roughing and finishing mills into steel strips. The hot steel strips from the last finishing mill are cooled to a set temperature through laminar cooling and coiled into steel coils by coilers. After cooling, these steel coils are processed into steel sheets, leveled coils, and slitted steel strips through various finishing lines (flattening, straightening, cross-cutting or slitting, inspection, weighing, packaging, and marking) based on user requirements. Simply put, a heated steel slab (the red-hot, glowing blocks often seen in television) undergoes several rolling processes, trimming, and straightening to become a steel sheet. This process is known as hot rolling.
Surface and Toughness: Slightly poorer surface flatness and toughness.
Temperature: Hot rolling occurs at temperatures similar to forging.
Surface Oxidation: Hot-rolled stainless steel plates have an oxide layer on the surface and some thickness variation.
Applications: Due to its manufacturing process, hot-rolled stainless steel plate is often used in civilian applications like kitchenware and general household appliances.
Mechanical Properties: The mechanical properties of hot-rolled stainless steel are inferior to those of cold-processed and forged products but offer good toughness and ductility.
Cold rolling uses hot-rolled steel coils as raw materials. After acid pickling to remove the oxide layer, the steel is cold-rolled into hard coils. The continuous cold deformation causes work hardening, increasing the strength and hardness of the rolled hard coil, while reducing its ductility, making it suitable only for parts with simple deformation. Cold-rolled hard coils can be used as raw materials for hot-dip galvanizing plants, as these facilities have annealing lines. The weight of hard coils generally ranges from 6 to 13.5 tons, with an inner diameter of 610mm. The steel is continuously rolled at room temperature from hot-rolled pickled coils.
Toughness and Cost: Cold-rolled stainless steel plates have lower toughness due to some degree of work hardening and is more expensive.
Surface Quality: It has a high-quality surface with no oxide layer.
Dimensional Precision: Products made from cold rolling have high dimensional accuracy and good surface quality.
Applications: Cold-rolled steel is widely used in various industries due to its production process, including for making cold-stamped parts, cold-extruded profiles, cold-rolled springs, cold-drawn wires, and cold-forged bolts.
Cold-Rolled: No oxide layer, high-quality surface.
Hot-Rolled: Oxide layer present, some thickness variation.
Cold-Rolled: Better ductility and toughness, more expensive.
Hot-Rolled: Lower surface flatness and toughness, less expensive.
Cold-Rolled: Performed at room temperature, suitable for producing strips with high rolling speed.
Hot-Rolled: Performed at temperatures similar to forging.
Cold-Rolled: Gray surface.
Hot-Rolled: Black-brown surface.
Cold-Rolled: Higher smoothness.
Hot-Rolled: Less smooth compared to cold-rolled after plating.
These differences dictate the appropriate use of each type of stainless steel in various applications, ensuring the right balance of mechanical properties, surface finish, and cost.
