Description
Stainless Steel Forged Bars are solid steel bars with round or square cross-sections made of stainless steel through a forging process. The forging process heats the metal billet and applies pressure to deform it in a die to form the desired shape and size. This process increases the internal structural density of the metal and improves its mechanical properties. Stainless Steel Forged Bars are often used to manufacture mechanical parts that are subject to high loads or high pressures, such as shafts, gears, couplings, etc. Its size, shape and performance can be customized according to specific application requirements. Stainless Steel Forged Bars are widely used in aerospace, chemical, petroleum, machinery manufacturing and other industries.
Features
Strong mechanical properties
During the forging process, stainless steel is in a high temperature state and is subjected to strong pressure, which causes the internal grains to rearrange along the deformation direction, forming a dense, fine and consistent grain structure. This change directly enhances the tensile strength, yield strength and fatigue life of the material. The yield strength of 316 stainless steel forged rods treated by hot forging can reach 290 MPa, and the tensile strength is increased to 580 MPa, which is about 15% higher than the cold-rolled materials of the same grade. At the same time, the cross-sectional shrinkage and elongation are also improved simultaneously, which improves the overall toughness and plasticity of the material. This strength comes from the grain refinement effect and the distribution of the internal fiber streamlines of the metal along the contour direction of the part, which avoids the probability of processing cracks, thereby enhancing the bearing capacity of the overall structure, especially for components requiring high mechanical stress.
Excellent corrosion resistance
During the forging process, due to uniform heating and deformation, the uniform distribution of alloy elements (such as chromium, nickel, and molybdenum) in stainless steel is ensured, forming a stable passivation film and enhancing its corrosion resistance. Taking 316L forged stainless steel as an example, its chromium content is 16.5%-18%, nickel content is 10%-12%, and 2%-3% molybdenum is added to improve the pitting resistance in chloride ion environment. After forging, there are almost no defects such as inclusions and pores inside the material, so the pitting potential increases by more than 300 mV, which significantly reduces the probability of local corrosion. In addition, the metal crystal structure is dense, which inhibits the development of microcracks and intergranular corrosion paths. Compared with rolled materials, forged rods show a lower corrosion rate in salt spray tests, and the average corrosion depth decreases by more than 20%. This feature makes it widely used in marine, chemical and high-humidity environments.
Strong thermal stability
In high-temperature applications, stainless steel forged rods can maintain good dimensional stability and mechanical properties, mainly due to the stable grain structure after high-temperature forging treatment. 310S stainless steel forged rods still have a yield strength of about 190 MPa at 1150°C, and the thermal expansion coefficient is controlled at 16.3 µm/m·K, which effectively avoids thermal deformation and expansion mismatch problems. At the same time, the forged structure can prevent grain coarsening and improve the creep rupture life. After 304 forged stainless steel has been running continuously at 650°C for 3000 hours, the creep rate of the material is less than 0.2%/1000 hours, which increases the thermal stability time by 35% compared with ordinary rolled materials. Therefore, it is widely used in heat exchangers, boiler pipes, turbine shafts and other scenes with strict requirements on high temperature stability.
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