304 is a versatile stainless steel that is widely used to make equipment and parts that require good overall performance (corrosion resistance and formability). 301 stainless steel shows a significant work hardening phenomenon during deformation and is used in various applications where higher strength is required.
302 stainless steel is essentially a variant of 304 stainless steel with a higher carbon content, which can be obtained by cold rolling.
302B is a kind of stainless steel with high silicon content. It has high resistance to high temperature oxidation.
303 and 303Se are free-cutting stainless steels that contain sulfur and selenium, respectively, and are used in applications where high lightness and high lightness are primarily required. 303Se stainless steel is also used to make parts that require hot boring because the stainless steel has good hot workability under these conditions.
304L is a variant of 304 stainless steel with a low carbon content and is used where welding is required. The lower carbon content minimizes the precipitation of carbides in the heat-affected zone near the weld, and the precipitation of carbides may cause intergranular corrosion in some environments (weld erosion).
304N is a nitrogen-containing stainless steel that is added to improve the strength of the steel.
305 and 384 stainless steels contain high nickel and have a low work-hardening rate. They are suitable for a wide range of applications requiring high cold formability.
308 stainless steel is used to make the electrode.
309, 310, 314, and 330 Stainless steels have relatively high contents of nickel and chromium in order to improve the oxidation resistance and creep strength of steel at high temperatures. The 30S5 and 310S are variants of the 309 and 310 stainless steels. The only difference is that the carbon content is low, in order to minimize the precipitation of carbides near the weld. 330 stainless steel has a particularly high resistance to carburization and thermal shock resistance.
Type 316 and 317 stainless steels contain aluminum, which greatly outperforms 304 stainless steels in marine and chemical industry environments. Among them, Type 316 stainless steel consists of variants including low-carbon stainless steel 316L, nitrogen-containing high-strength stainless steel 316N, and high sulfur-rich free-cutting stainless steel 316F.
321, 347, and 348 are stainless steels stabilized with titanium, niobium, tantalum, and niobium, respectively, suitable for use as welded components at high temperatures. 348 is a kind of stainless steel suitable for the nuclear power industry. It has certain restrictions on the amount of concrete and drill. The most commonly used stainless steel for decorative tube sheets is austenitic type 304. Generally speaking, it is non-magnetic or weakly magnetic. However, magnetic properties may occur due to chemical composition fluctuations or processing conditions due to smelting, but this cannot be considered as Counterfeit or unqualified, what is the reason?
The above mentioned austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to segregation or improper heat treatment during smelting, it will cause a small amount of martensite or ferrite in austenitic 304 stainless steel. Body organization. In this way, 304 stainless steel will have a weak magnetic.
In addition, 304 stainless steel after cold processing, the organization structure will also be transformed to martensite, the greater the cold deformation degree, the more martensite transformation, the greater the magnetic steel. Such as the same batch of steel, production Φ76 tube, no significant sense of magnetic, production Φ9.5 tube. Due to the large bending deformation of the magnetic induction is obvious, the production of rectangular tube due to the deformation of the larger than the round tube, especially the folding part, the deformation is more intense magnetic more obvious.
In order to completely eliminate the magnetic properties of 304 steel caused by the above reasons, the stable austenite structure can be recovered by high-temperature solution treatment, thereby eliminating magnetic properties.
In particular, the magnetic properties of 304 stainless steel due to the above reasons are not the same as the magnetic properties of stainless steels of other materials such as 430 and carbon steel. That is, the magnetic properties of 304 steel always show weak magnetic properties.
This tells us that if the stainless steel is weakly magnetic or completely magnetic, it should be judged to be 3-4 or 316; if it is the same as carbon steel, it shows strong magnetism, because it is not 304 material.
302 stainless steel is essentially a variant of 304 stainless steel with a higher carbon content, which can be obtained by cold rolling.
302B is a kind of stainless steel with high silicon content. It has high resistance to high temperature oxidation.
303 and 303Se are free-cutting stainless steels that contain sulfur and selenium, respectively, and are used in applications where high lightness and high lightness are primarily required. 303Se stainless steel is also used to make parts that require hot boring because the stainless steel has good hot workability under these conditions.
304L is a variant of 304 stainless steel with a low carbon content and is used where welding is required. The lower carbon content minimizes the precipitation of carbides in the heat-affected zone near the weld, and the precipitation of carbides may cause intergranular corrosion in some environments (weld erosion).
304N is a nitrogen-containing stainless steel that is added to improve the strength of the steel.
305 and 384 stainless steels contain high nickel and have a low work-hardening rate. They are suitable for a wide range of applications requiring high cold formability.
308 stainless steel is used to make the electrode.
309, 310, 314, and 330 Stainless steels have relatively high contents of nickel and chromium in order to improve the oxidation resistance and creep strength of steel at high temperatures. The 30S5 and 310S are variants of the 309 and 310 stainless steels. The only difference is that the carbon content is low, in order to minimize the precipitation of carbides near the weld. 330 stainless steel has a particularly high resistance to carburization and thermal shock resistance.
Type 316 and 317 stainless steels contain aluminum, which greatly outperforms 304 stainless steels in marine and chemical industry environments. Among them, Type 316 stainless steel consists of variants including low-carbon stainless steel 316L, nitrogen-containing high-strength stainless steel 316N, and high sulfur-rich free-cutting stainless steel 316F.
321, 347, and 348 are stainless steels stabilized with titanium, niobium, tantalum, and niobium, respectively, suitable for use as welded components at high temperatures. 348 is a kind of stainless steel suitable for the nuclear power industry. It has certain restrictions on the amount of concrete and drill. The most commonly used stainless steel for decorative tube sheets is austenitic type 304. Generally speaking, it is non-magnetic or weakly magnetic. However, magnetic properties may occur due to chemical composition fluctuations or processing conditions due to smelting, but this cannot be considered as Counterfeit or unqualified, what is the reason?
The above mentioned austenite is non-magnetic or weakly magnetic, while martensite or ferrite is magnetic. Due to segregation or improper heat treatment during smelting, it will cause a small amount of martensite or ferrite in austenitic 304 stainless steel. Body organization. In this way, 304 stainless steel will have a weak magnetic.
In addition, 304 stainless steel after cold processing, the organization structure will also be transformed to martensite, the greater the cold deformation degree, the more martensite transformation, the greater the magnetic steel. Such as the same batch of steel, production Φ76 tube, no significant sense of magnetic, production Φ9.5 tube. Due to the large bending deformation of the magnetic induction is obvious, the production of rectangular tube due to the deformation of the larger than the round tube, especially the folding part, the deformation is more intense magnetic more obvious.
In order to completely eliminate the magnetic properties of 304 steel caused by the above reasons, the stable austenite structure can be recovered by high-temperature solution treatment, thereby eliminating magnetic properties.
In particular, the magnetic properties of 304 stainless steel due to the above reasons are not the same as the magnetic properties of stainless steels of other materials such as 430 and carbon steel. That is, the magnetic properties of 304 steel always show weak magnetic properties.
This tells us that if the stainless steel is weakly magnetic or completely magnetic, it should be judged to be 3-4 or 316; if it is the same as carbon steel, it shows strong magnetism, because it is not 304 material.
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