316l Stainless Pipe

316l stainless pipe

316L is a low carbon stainless steel. It can be either electric welding or argon arc welding.

Austenitic stainless steel is considered to be the easiest stainless steel to weld, and can be welded with all fusions, as well as resistance welding. Welding points to consider two important factors:

Avoid hardening cracks;

Maintain corrosion resistance of welding joints and heat affected zones.

For welds used in corrosive environments, low carbon 316L welding is recommended. The higher the carbon content of the welding metal, the more likely it is to produce carbide precipitation (sensitization), which can lead to intergranular corrosion

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Daily precautions for 316L stainless steel pipe

Stainless steel is not permanent rust, but also for daily maintenance and cleaning. Regardless of the corrosion, the surface of stainless steel should be kept clean during processing and use.

For light industry, less maintenance is required, and only sheltered areas sometimes need to be cleaned with pressurized water. Heavy industry recommends frequent cleaning to remove accumulated dust, which may eventually cause corrosion and damage the surface appearance of stainless steel.

Stubborn stains and deposits can be scrubbed with detergent and fiber brush, sponge, stainless steel wool. Stainless steel lint can leave a permanent scratch on a smooth stainless steel surface. Many stainless steels are cleaned and disinfected regularly. Equipment is usually cleaned with special caustic soda, organic solvents, and acidic solutions (such as phosphoric acid or sulfuric acid). Strong reducing acids (such as hydrofluoric acid or hydrochloric acid) can cause damage to stainless steel. After solution cleaning, rinse stainless steel thoroughly with clean water. In this way, daily maintenance is very useful for the protection of stainless steel.

The role of stainless steel solution treatment

Austenitic stainless steel is softened by solid solution treatment, generally heating the steel wire to about 950 ~ 1150 ° C, holding heat for a period of time, so that carbide and various alloying elements are fully and evenly dissolved in austenite, and then quickly quenched water cooling, carbon and other alloying elements are too late to precipitate, and pure austenitic organization is obtained, which is called solid solution treatment. Solution treatment has three functions.

Make the steel wire structure and composition uniform, which is especially important for the raw material, because the rolling temperature and cooling speed of each section of the hot rolled wire are not the same, resulting in inconsistent organizational structure. At high temperature, the atomic activity intensifies, the σ phase dissolves, the chemical composition tends to be uniform, and a uniform single-phase structure is obtained after rapid cooling.

Eliminate work hardening to facilitate continued cold working. Through solution treatment, the twisted lattice is restored, the elongated and broken grains are recrystallized, the internal stress is eliminated, the tensile strength of the steel wire is reduced, and the elongation is increased.

Restore the inherent corrosion resistance of stainless steel. Due to cold processing caused by carbide precipitation, lattice defects, so that the corrosion resistance of stainless steel decreased. The corrosion resistance of the steel wire was restored to the best state after solution treatment.

The three elements of solution treatment are temperature, holding time and cooling rate. The solution temperature is mainly determined by the chemical composition. Generally speaking, with many types of alloying elements and high content, the solution temperature should be increased accordingly. Especially for steel with high content of manganese, molybdenum, nickel and silicon, the softening effect can be achieved only by increasing the solution temperature and fully dissolving it. However, in stabilized steels, such as 1Cr18Ni9Ti, the carbides of stabilized elements are fully dissolved in austenite when the solution temperature is high, and will precipitate at the grain boundaries in the form of Cr23C6 during subsequent cooling, resulting in intergranular corrosion. In order to make the carbides of stabilized elements (TiC and NbC) do not decompose and do not solute, the lower limit solution temperature is generally used.

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