CN109355592B - Non-magnetic 316L stainless steel and production method thereof - Google Patents
Non-magnetic 316L stainless steel and production method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
Abstract
The invention discloses a non-magnetic 316L stainless steel and a production method thereof, wherein the non-magnetic 316L stainless steel comprises the following chemical components in percentage by weight: c0.01-0.03; si is less than or equal to 1.0; mn is less than or equal to 2.0; p is less than or equal to 0.045; s is less than or equal to 0.002; 16.5-17.50% of Cr; 13.5 to 14.0 Ni; mo: 2.5 to 2.7; n is less than or equal to 0.11; b0.001-0.003; the balance of Fe and other inevitable impurity elements; md30 is between-170 ℃ and-200 ℃; delta ferrite is less than 0.5 percent; the method comprises the processes of smelting of steel billets, heating of plate blanks, rolling of the plate blanks, annealing and pickling of black coils, modulation and calendering, and cleaning and oil removal. The invention has the advantages that the requirements of non-magnetism, processability and corrosion resistance are considered, the harmful element S, P is controlled, the Cr oxidation is inhibited, and the inclusion is controlled; the non-magnetic stainless steel is obtained without annealing and demagnetization, and is used for electronic product structural parts and stainless steel frames.
Description
Technical Field
The invention belongs to the technical field of stainless steel production, and particularly relates to non-magnetic stainless steel and a production method thereof.
Background
As is well known, magnetism is a problem often encountered in stainless steel parts for electronic devices, and it is desired to use nonmagnetic materials for camera parts, navigators, mobile phone structural parts, and the like. Although 304(Cr-Ni), 316L (Cr-Ni-Mo) austenitic stainless steel is conventionally classified as nonmagnetic steel, some magnetism tends to remain or to be generated due to composition differences or the influence of processing. However, the general austenitic stainless steel is limited in composition, the content of austenite stabilizing elements is insufficient, and the steel generally contains about 5 to 10% of delta ferrite at normal temperature, so that the steel is slightly magnetic. Also, since austenite is not sufficiently stable and accompanies partial transformation of austenite into deformed martensite during cold working, 304 and 316L stainless steels exhibit different magnetic properties during working and use thereof since δ ferrite and martensite are both ferromagnetic structures.
The technical parameter for measuring the magnetism of the stainless steel is relative magnetic permeability (mu r) which is the ratio of the magnetic permeability of a special medium to vacuum magnetic permeability (mu 0), and the nonmagnetic requirement of instruments and standard parts is that the mu r is less than or equal to 1.01 or lower. In particular, precision parts and standard parts with high machining requirements have a serious influence on the machining performance when the standard parts are machined by a Computer Numerical Control (CNC) machine tool, such as magnetic materials. For example, when a Computer Numerical Control (CNC) machine tool is processed, fine metal chips of a processing blade are easily gathered, the service life of the blade is influenced, metal powder generated by additional workers is easily absorbed when a product is processed, the metal powder is not easily removed, and the quality and the precision of the product are seriously influenced.
In the prior art, the 310 steel type can also achieve a nonmagnetic effect, but most electronic products belong to intelligent wearable products, are in high chloride ion corrosion environments such as human sweat, body fluid and the like for a long time, have insufficient corrosion resistance, and limit the application of the products in certain aspects, and the current research is continuously dedicated to the development of high corrosion resistance and nonmagnetic austenitic stainless steel.
The high-manganese non-magnetic steel has poor corrosion resistance, so that the high-manganese non-magnetic steel can only be applied to occasions with low requirements on corrosion resistance, and the situation complementary to the non-magnetic stainless steel in industrial application is formed. Since the 2l century, the contents of Ni and Cr are no longer the main factors restricting the development of nonmagnetic stainless steel in China, and from the viewpoints of increasing the labor cost and the comprehensive cost and maintainability of the whole life cycle of modern equipment, the development of high Cr-Ni-Mo nonmagnetic stainless steel is particularly urgent for the manufacture of precise instruments and high-end large-scale equipment parts, and the use cost of the high Cr-Ni-Mo nonmagnetic stainless steel can be greatly reduced along with the remarkable extension of the use life, so that the high Cr-Ni-Mo nonmagnetic stainless steel plays an important role in improving the quality of material products in the industries of electronic equipment, precise machinery and the like and upgrading the industry.
Chinese patent application No. 201310039502.0, application No. 2013.02.01, granted publication No. 2014.12.03, granted publication No. CN103060523B, discloses a "method for smelting non-magnetic stainless steel", but the method focuses on improving cracks in quality, is only suitable for producing non-magnetic steel of 0Cr16Ni14 and 0Cr18Ni12, and does not contain Mo element in the product. In the steel grade, a large amount of austenite forming element Ni is added, and during cold working, the austenite element Ni has a positive effect of expanding an austenite phase region and preventing martensite from forming, while Mo is a ferrite element, but the improvement of Mo has a great effect of corroding Cl-ions, and although the increase of Mo increases the cold working permeability of the stainless steel, but the large amount of austenite element balance phase greatly reduces the tendency of pitting corrosion while improving the cold working performance.
Chinese patent application No. 201610722915.2, application No. 2016.08.25, application No. 2016.12.21, and application No. CN106244944A disclose "a non-magnetic stainless steel wire rod and a method for producing the same", which also does not contain Mo element, cannot solve the problem of Cl ion corrosion such as human sweat, and has a low content of austenite element, and in the cold working deformation process, martensite is generated, which causes magnetic flux to rise, and cannot meet the requirements of materials for electronic devices.
Disclosure of Invention
Aiming at the problems that the non-magnetic stainless steel in the prior art cannot meet the requirements of non-magnetism, processability and corrosion resistance due to low alloy content, no Mo element and the like, the invention meets the performance requirements, meets the requirements of electronic products, adjusts the components of 316L stainless steel products, controls S, P harmful elements in steel making, develops an ultra-low desulfurization and decarburization technology and ensures steel making components. Meanwhile, molten steel has strong oxidizability at high temperature, and a pure steel smelting process is implemented while Cr oxidation is inhibited, so that the aim of controlling inclusions is fulfilled.
According to the defects of the conventional austenitic stainless steel 316L described above, the nonmagnetic stainless steel can be obtained without annealing and demagnetizing processes after being rolled or processed in other modes, and can be applied to the fields of electronic product structural parts, stainless steel frames and the like with high requirements on the magnetism of the stainless steel.
The magnetism of stainless steel is related to the composition and structure of the material, the composition is a fully austenitic structure, namely showing no magnetism, and when the composition is ferrite or martensite, showing magnetism, Post and Eberly in the article of special steel wires propose that the lowest Ni content for obtaining the fully austenitic structure in 300 series stainless steel at normal temperature is:
theoretical Ni value (Cr +1.5Mo-20)2/12-Mn/2-35C +15
In the formula, Ni, Cr, Mo, Mn and C are the mass percent of the elements, for example, the Cr content is 16.5 percent, and the calculated Cr is 16.5. For stainless steels containing nitrogen and copper, Criffiths and Wright et al, in turn, propose a modified formula for the minimum Ni content:
theoretical Ni value (Cr +1.5Mo-20)2/12-Mn/2-35C-Cu-27N +15
For the magnetic properties of the stainless steel components, the stability of austenite in the steel can be judged by a measure of the delta value (actual value of Ni-theoretical value):
the delta is a total austenite structure at normal temperature and has no magnetism when the actual value-the theoretical value delta of Ni is more than 0;
delta ferrite structure exists at normal temperature and shows weak magnetism when delta is an actual value of Ni-a theoretical value of Ni, and delta is less than 0;
when Δ is less than 0 in the above formula, the larger the negative value is, the stronger the magnetic property is.
Based on the mechanism, the invention considers the design purposes of economy, processability and non-magnetism of the material, finally determines reasonable component proportion and processing technology through a plurality of laboratory tests, and obtains the non-magnetism stainless steel with more excellent corrosion resistance, processability and non-magnetism compared with the conventional 316L stainless steel through production.
The invention relates to non-magnetic 316L stainless steel and a non-magnetic stainless steel plate strip produced by the same, which are characterized by comprising the following chemical components in percentage by weight: c: 0.01 to 0.03; si is less than or equal to 1.0; mn is less than or equal to 2.0; p is less than or equal to 0.045; s is less than or equal to 0.002; cr: 16.5 to 17.50; ni: 13.5 to 14.0; mo: 2.5 to 2.7; n is less than or equal to 0.11; b: 0.001 to 0.003; the balance of Fe and other inevitable impurity elements; md30 is between-170 ℃ and-200 ℃; delta ferrite is less than 0.5 percent.
Preferably, the nonmagnetic 316L stainless steel comprises the following chemical components in percentage by weight: c: 0.01 to 0.03; si: 0.3 to 0.6; mn is less than or equal to 2.0; p is less than or equal to 0.045; s is less than or equal to 0.002; cr: 17.0 to 17.50; ni: 13.5 to 14.0; mo: 2.5 to 2.7; n: 0.05 to 0.08; b: 0.001 to 0.003; the balance of Fe and other inevitable impurity elements; md30 is between-170 ℃ and-200 ℃; delta ferrite is less than 0.5 percent.
Preferably, the weight percentage of the component P is less than or equal to 0.035.
Specifically, the functions and preferred compositions of the various elements employed in the present invention are:
c is an element which is advantageous for increasing the strength of stainless steel in principle of solid solution strengthening and is also an austenite stabilizing element, but an excessive amount of C causes Cr elements which are advantageous for corrosion resistance and the like to form carbides at the ferrite-austenite phase interface, reduces the content of Cr elements and the like around the grains, and reduces the corrosion resistance of stainless steel, preferably < 0.03%.
In stainless steel, like Ni, N is one of elements that contribute significantly to the stabilization of the austenite phase, and an increase in the N content may additionally improve corrosion resistance and strength, but an excessively high N content may reduce workability of stainless steel, and an excessively low N content may require a corresponding reduction in Cr to ensure phase balance, and may also adversely affect the phase balance and strength, preferably 0.05 to 0.08%.
Cr is an element necessary for ensuring the corrosion resistance of stainless steel, and increasing the Cr content can improve the corrosion resistance of stainless steel, but too much Cr content causes too much ferrite to be formed in the stainless steel, and sufficient tensile elongation of the stainless steel cannot be ensured, so the Cr content is generally preferably in the range of 16.5 to 18.0%, and more preferably 17.0 to 17.5%.
Ni: the Ni content is suitable within the range of 13.5-14.5%, and is preferably 13.5-14.0% because the electronic product structural member needs a large amount of mechanical processing in the later period.
Md30 is the temperature at which 50% of martensite is induced by machining when the machining amount is 30%, the lower the value of Md30 is, the less the martensite is induced by cold-working deformation, the smaller the cold-work hardening degree is, and the more the product magnetism is stabilized; it is generally believed that the effect of the Ni content on the mutagenized martensitic transformation point is significant, the Ni content is high, the martensitic transformation point is reduced, and the material hardens to a lesser extent during cold deformation. However, the austenitic stainless steel provided by the invention has an extremely low Md30 value, is controlled within the range of-170 to-200, and not only can the austenitic stainless steel be ensured to have good processing performance, but also the strength of the austenitic stainless steel can be improved.
Although delta ferrite is high-temperature ferrite, a small amount of delta ferrite still remains in a normal-temperature product in general stainless steel, and about 5-10% of delta ferrite exists in general austenitic stainless steel, so that the stress corrosion cracking tendency is favorably reduced. However, since both the δ ferrite and the martensite belong to the ferromagnetic phase, they should be controlled as a harmful phase in the non-magnetic stainless steel, preferably < 0.5%.
The invention also provides a production method of the non-magnetic 316L stainless steel aiming at the components of the non-magnetic 316L stainless steel, which is characterized by comprising the following steps:
firstly, smelting a steel billet: smelting by an electric furnace (EAF), argon oxygen decarburization refining (AOD) and a refining furnace (LT) and continuously casting by a continuous casting machine to form a plate blank;
step two, heating the plate blank: heating in a walking beam type heating furnace, wherein the heating temperature is controlled according to the following requirements: a preheating section 920 ℃; a heating section: 1070-1100 ℃, soaking section: 1200-1260 ℃; heating the plate blank for 240 minutes, discharging the plate blank after the temperature is reached, and carrying out hot rolling;
step three, rolling of the plate blank: after 5-7 times of rough rolling is carried out on a stainless steel rough rolling mill, the plate strip enters a steckel mill for finish rolling, is rolled into a 4.0mm hot-rolled black coil, is cooled by laminar flow, is coiled and is placed in a cooling field for air cooling to a normal temperature state;
step four, annealing and pickling of the black coil: introducing the stainless steel black coil into a continuous annealing pickling furnace for solution heat treatment, pickling the product after the heat treatment on a pickling line, and changing the pickled stainless steel black coil into a hot-rolled white coil;
and fifthly, carrying out 5-50% modulation rolling on the hot-rolled white coil according to the requirements of the thickness and the material hardness of the final product, then cleaning and removing oil to obtain strips with different hardness of 200-400 HV, and carrying out post-processing such as cutting and turning to obtain the non-magnetic 316L stainless steel product for the electronic equipment.
Compared with the prior art, the invention has the beneficial effects that aiming at the reasons that the non-magnetic stainless steel in the prior art is low in alloy content, does not contain Mo element and the like, the requirements of non-magnetism, processability and corrosion resistance can not be met, the invention meets the performance requirements, the requirements of electronic products are met, the components of 316L stainless steel products are adjusted, meanwhile, the harmful element S, P in steel making is controlled, ultra-low desulfurization and decarburization are carried out, and the steel making components are ensured; meanwhile, molten steel has strong oxidability at high temperature, and a pure steel smelting process is implemented while Cr oxidation is inhibited, so that the aim of controlling inclusions is fulfilled; after being rolled or processed by other modes, the non-magnetic stainless steel (the relative magnetic conductivity is less than 1.01Ur) can be obtained without annealing and demagnetizing processes, and the non-magnetic 316L stainless steel is mainly applied to the fields of electronic product structural parts, stainless steel frames and the like which have higher requirements on the magnetic property of the stainless steel.
Detailed Description
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses a further embodiment of the present invention.
Example one
Firstly, smelting a steel billet:
smelting by an electric furnace (EAF), argon oxygen decarburization refining (AOD) and a refining furnace (LT), continuously casting by a continuous casting machine to form a plate blank, wherein the stainless steel plate blank comprises the following chemical components in percentage by mass: c: 0.016; si: 0.47; mn: 1.28; p: 0.02; s: 0.0012; cr: 17.45 of; ni: 13.7; mo: 2.62; n: 0.047; b: 0.0022; md30 is-183 ℃; 0.1 percent of delta ferrite; the balance of Fe and inevitable impurity elements;
step two, heating the plate blank:
heating in a walking beam type heating furnace, wherein the heating temperature is controlled according to the following requirements: a preheating section 920 ℃; a heating section: 1070-1100 ℃, soaking section: 1200-1260 ℃; the slab is heated for 240 minutes, and is discharged and hot rolled after reaching the temperature.
Step three, rolling of the plate blank:
after 5-7 times of rough rolling is carried out on a stainless steel rough rolling mill, the plate strip enters a steckel mill for finish rolling, the plate strip is rolled into a hot-rolled black coil with the thickness of 5.0mm, and the hot-rolled black coil is coiled and placed in a cooling field for air cooling to the normal temperature state after laminar cooling.
Step four, annealing and pickling of the black coil: and (2) introducing the stainless steel black coil into a continuous annealing pickling furnace for solution heat treatment, pickling the product subjected to heat treatment on a pickling line, changing the pickled stainless steel black coil into a hot-rolled white coil, and performing cutting and forging processing according to the product requirements at the later stage to obtain the non-magnetic 316L product for the electronic equipment.
And detecting the relative magnetic flux of the hot-rolled white coil and the product after cold forging pressing, wherein the relative magnetic permeability is defined as a symbol mu r and is the ratio of the magnetic permeability of the special medium to the vacuum magnetic permeability mu 0, and finally, the magnetic permeability mu r of the hot-rolled white coil is 1.003, the relative magnetic flux mu r of the product after cold forging pressing is 1.003, the product has no change in magnetism, and meets the standard of nonmagnetic stainless steel.
Example two
Firstly, smelting a steel billet:
smelting by an electric furnace (EAF), argon oxygen decarburization refining (AOD) and a refining furnace (LT), continuously casting by a continuous casting machine to form a plate blank, wherein the stainless steel plate blank comprises the following chemical components in percentage by mass: c: 0.014; si: 0.43; mn: 1.28; p: 0.023; s: 0.0017; cr: 17.28; ni: 14.00; mo: 2.58; n: 0.073; b: 0.0029; md30 is-176 ℃; delta ferrite-2.4%; the balance of Fe and inevitable impurity elements;
step two, heating the plate blank:
heating in a walking beam type heating furnace, wherein the heating temperature is controlled according to the following requirements: a preheating section 920 ℃; a heating section: 1070-1100 ℃, soaking section: 1200-1260 ℃; heating the plate blank for 240 minutes, discharging the plate blank after the temperature is reached, and carrying out hot rolling;
step three, rolling of the plate blank:
after 5-7 times of rough rolling is carried out on a stainless steel rough rolling mill, the plate strip enters a steckel mill for finish rolling, is rolled into a 4.0mm hot-rolled black coil, is cooled by laminar flow, is coiled and is placed in a cooling field for air cooling to a normal temperature state;
step four, annealing and pickling of the black coil: introducing the stainless steel black coil into a continuous annealing pickling furnace for solution heat treatment, pickling the product after the heat treatment on a pickling line, and changing the pickled stainless steel black coil into a hot-rolled white coil;
and step five, performing 5-50% modulation rolling on the hot-rolled white coil according to the requirements of the thickness and the material hardness of a final product, then cleaning and removing oil to obtain strips with different hardness of 200-400 HV, and performing post-processing such as cutting and turning to obtain the non-magnetic 316L product for the electronic equipment.
And detecting the relative magnetic flux of the hot-rolled white coil and the final product to obtain that the magnetic permeability mu r of the hot-rolled white coil is 1.002, the relative magnetic flux mu r of the finished product after cold forging pressing is 1.002, and the product has no change in magnetism and meets the standard of nonmagnetic stainless steel.
According to the non-magnetic 316L product for the electronic equipment, the content of austenite elements is increased in the component design of the material, and a certain amount of Mo elements are added according to the analysis result of the use environment, so that the purposes of cold deformation, no martensite phase transformation and corrosion resistance improvement are realized.
Taking a stainless steel frame of a certain brand of mobile phone in China as an example, the product adopts a general 304 product, and is applied to a frame structure of the mobile phone after being formed and polished, after the product is used for a period of time, a plurality of edge-raising corrosion events occur, and after being analyzed by related technologies, the product is finally confirmed to be in contact with acidic substances such as high Cl-ions and the like such as human sweat for a long time in the use process of the mobile phone, and the frame is rusted due to the fact that the corrosion resistance of the 304 stainless steel to the Cl-ions is weak.
According to a comparison table of the chloride-resistant concentration of the stainless steel, the concentration of 304 stainless steel is only 150ppm and 316L can only reach 250ppm in an environment at 50 ℃, the content of chlorine ion resistant alloy elements Mo and N is increased, the chlorine ion corrosion resistance of the material is greatly improved to be more than 300ppm, and the problem of rusting caused by long-term contact of electronic products and a human body is successfully solved.
Second, stainless steel is very low in magnetic properties in the normal state. However, after processing techniques such as rolling and forging, magnetism is generated due to transformation of martensite phase, and the purpose of demagnetization is difficult to achieve by subsequent processing techniques. At present, 5G mobile phones are gradually popularized, high-frequency 5G signals are easily interfered by magnetism, and the magnetism can influence the automatic focusing and resolution ratio of a camera, so that the invention successfully solves a series of problems encountered by upgrading electronic products.
The invention compares the deformation and magnetism:
as can be seen from the above table, the non-magnetic 316L material of the invention has no magnetic change basically in the processing process, and successfully solves the problem of magnetic permeability increase caused by stainless steel processing.
The present invention is not limited to the embodiments described, and those skilled in the art can make modifications or changes within the scope of the disclosure without departing from the spirit of the present invention.
Claims (3)
1. A nonmagnetic 316L stainless steel is characterized in that: the chemical components by weight percentage are as follows: c: 0.01 to 0.03; si is less than or equal to 1.0; mn is less than or equal to 2.0; p is less than or equal to 0.045; s is less than or equal to 0.002; cr: 16.5 to 17.50; ni: 13.5 to 14.0; mo: 2.5 to 2.7; n is less than or equal to 0.11; b: 0.001 to 0.003; the balance of Fe and other inevitable impurity elements; md30 is between-170 ℃ and-200 ℃; delta ferrite is less than 0.5 percent; the production method of the non-magnetic 316L stainless steel comprises the following steps:
firstly, smelting a steel billet: continuously casting the mixture into a plate blank through a continuous casting machine after the mixture is smelted by an electric furnace, argon oxygen decarburization refining and a refining furnace;
step two, heating the plate blank: heating in a walking beam type heating furnace, wherein the heating temperature is controlled according to the following requirements: a preheating section 920 ℃; a heating section: 1070-1100 ℃, soaking section: 1200-1260 ℃; heating the plate blank for 240 minutes, discharging the plate blank after the temperature is reached, and carrying out hot rolling;
step three, rolling of the plate blank: after 5-7 times of rough rolling is carried out on a stainless steel rough rolling mill, the plate strip enters a steckel mill for finish rolling, is rolled into a 4.0mm hot-rolled black coil, is cooled by laminar flow, is coiled and is placed in a cooling field for air cooling to a normal temperature state;
step four, annealing and pickling of the black coil: introducing the stainless steel black coil into a continuous annealing pickling furnace for solution heat treatment, pickling the product after the heat treatment on a pickling line, and changing the pickled stainless steel black coil into a hot-rolled white coil;
and fifthly, carrying out 5-50% modulation rolling on the hot-rolled white coil according to the requirements of the thickness and the material hardness of the final product, and then cleaning and removing oil to obtain the strip with different hardness of 200-400 HV.
2. The nonmagnetic 316L stainless steel of claim 1, wherein: the chemical components by weight percentage are as follows: c: 0.01 to 0.03; si: 0.3 to 0.6; mn is less than or equal to 2.0; p is less than or equal to 0.045; s is less than or equal to 0.002; cr: 17.0 to 17.50; ni: 13.5 to 14.0; mo: 2.5 to 2.7; n: 0.05 to 0.08; b: 0.001 to 0.003; the balance of Fe and other inevitable impurity elements; md30 is between-170 ℃ and-200 ℃; delta ferrite is less than 0.5 percent.
3. A non-magnetic 316L stainless steel according to claim 1 or 2, wherein: the chemical composition of the P is less than or equal to 0.035 percent by weight.
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| CN109811274A (en) * | 2019-02-27 | 2019-05-28 | 江门市阳浩金属制品有限公司 | A kind of nonmagnetic steel and preparation method thereof |
| CN110819893A (en) * | 2019-10-18 | 2020-02-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Austenitic stainless steel for electronic products and preparation method thereof |
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