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1. according to the use of carbon steel can be divided into carbon structural steel, carbon tool steel and free cutting structural steel three categories, carbon structural steel is divided into engineering construction steel and machine manufacturing structural steel two.

2. according to the smelting method can be divided into open hearth steel, converter steel.

3. according to the deoxidation method can be divided into boiling steel (F), killed steel (Z), semi-killed steel (b) and special killed steel (TZ).

4. according to the carbon content can be divided into low carbon steel (WC≤0.25%), medium carbon steel (WC0.25%-0.6%) and high carbon steel (WC > 0.6%).

5. according to the quality of steel, carbon steel can be divided into ordinary carbon steel (containing phosphorus, sulfur is higher), high-quality carbon steel (containing phosphorus, sulfur is lower) and senior quality steel (containing phosphorus, sulfur is lower) and extra high quality steel.

Carbon steel is a common type of steel whose main components are iron and carbon. The content of carbon is between 0.2% and 2.11%, which makes carbon steel have good hardness and strength, but it also brings some disadvantages, such as easy rust and the need to go through heat treatment to enhance its performance.

The production process of carbon steel is relatively simple and can be obtained through smelting, rolling and other steps. It is widely used in various industrial fields, including construction, automobile manufacturing, machinery manufacturing, etc., because it is strong enough to withstand heavy pressure and has good processability.

However, while carbon steel has many advantages, it also has some limitations. For example, if the carbon content is too high, it may lead to increased brittleness; If the carbon content is too low, it may not provide enough strength. Therefore, choosing the right carbon content is crucial to producing high-quality carbon steel.

In general, carbon steel is an important engineering material, and its existence provides great convenience for our life and industrial production.

Stainless steel double seal pipe is a special design of the pipe, its main feature is that both the inner and outer layers are made of high-quality stainless steel material, and the double seal treatment is carried out at the interface. This design can effectively prevent the leakage of liquid or gas inside the pipeline, thus ensuring its safety and stability during use.

The inner and outer layers of the stainless steel double-sealed pipe are made of high-quality stainless steel material, which has corrosion resistance, high temperature resistance, wear resistance and other characteristics, so it can ensure that the pipe can maintain good performance in a variety of harsh environments. At the same time, the smooth surface of stainless steel also makes cleaning and maintenance work very simple.

At the interface, the stainless steel double sealing pipe adopts double sealing technology. This technique usually involves the use of special sealants or rubber gaskets to ensure the tightness of the interface. The double seal not only prevents liquid or gas leakage from the interface, but also provides additional protection when the pipe is impacted by external forces.

In general, stainless steel double-sealed pipe is a pipeline product with reasonable structure and excellent performance, which is widely used in chemical, petroleum, food, pharmaceutical and other fields.

As a widely used material, stainless steel has many excellent performance characteristics. First of all, the corrosion resistance of stainless steel is very good. Due to its chromium element, the stainless steel surface forms a dense chromium oxide protective film, which effectively prevents the metal from contacting with corrosive media such as air and water, thus significantly extending the service life of the material.

Secondly, stainless steel has good high temperature resistance. Under high temperature environment, stainless steel can still maintain stable performance and is not easy to deform or melt. This makes stainless steel in the industrial field has a wide range of applications, such as the manufacture of stoves, boilers, heat exchangers and other equipment.

In addition, stainless steel also has good strength and hardness. Its high strength and high hardness make the stainless steel perform well when bearing heavy loads and shocks, and it is not easy to break or deformation. Therefore, stainless steel is often used in the production of building structures, auto parts, medical equipment and other fields.

In addition, stainless steel also has good machinability and weldability. It can be cut, stamped, bent and other operations through various processing processes, and is easy to weld with other metal materials, which facilitates the manufacture and maintenance of products.

Finally, stainless steel also has a beautiful and generous appearance. Its smooth surface and silver-white color make it an ideal decorative material, which is widely used in kitchen utensils, home appliances, architectural decoration and other fields.

In summary, stainless steel shows excellent performance characteristics in corrosion resistance, high temperature resistance, strength and hardness, machinability and weldability, as well as aesthetics, making it an indispensable and important material in many fields.

Does 304 stainless steel pipe have a specific product classification? 

Stainless steel pipe is a kind of material widely used in various industrial fields, which has the characteristics of corrosion resistance, high temperature resistance and high strength. In the stainless steel pipe market, according to different uses and specifications, it can be divided into a variety of different types.

First of all, according to the wall thickness to divide, stainless steel pipe can be divided into thin wall pipe and thick wall pipe. Thin-walled tubes are usually used in occasions where smaller pressure or fluid flow is required, such as building decoration, mechanical parts, and so on. The thick wall pipe is suitable for engineering fields under greater pressure or with greater fluid flow, such as petroleum, chemical industry, shipbuilding and so on.

Secondly, according to the different production process, stainless steel pipes can be divided into seamless pipes and welded pipes. Seamless pipe is processed by cold drawing or hot rolling process, with high precision and surface quality. Welded pipe is made by rolling steel plate or strip into a tube, which is suitable for mass production and low cost requirements.

In addition, there are some special types of stainless steel pipes, such as ultra-low carbon 304 stainless steel pipes, nickel-based alloy steel pipes and so on. These special types of stainless steel tubes have higher strength, corrosion resistance and wear resistance, and are suitable for some areas with special requirements, such as the nuclear industry, aerospace and so on.

In summary, 304 stainless steel pipes can be classified according to factors such as wall thickness, production process and special needs to meet the needs of different industries and applications.

There may be many factors for the cause of porosity in stainless steel pipes. The following are some of the main reasons that may cause pores in stainless steel pipes:

Material issues: The use of low-quality stainless steel materials or materials that do not meet specifications can lead to the formation of pores. These materials may have defects, such as inclusions, bubbles or other unevenly distributed substances, which may lead to the formation of pores during processing.

Improper welding process: In the welding process, if the welding parameters are set incorrectly or improperly operated, such as too much current, too high voltage, too fast welding speed, etc., it may lead to overheating of the weld, resulting in porosity. In addition, the quality of the welding wire or protective gas may also have an impact on the formation of pores.

Improper heat treatment: In the heat treatment process, if the temperature is not properly controlled or the holding time is insufficient, it may lead to the internal organization of the stainless steel pipe is unstable and the porosity is generated. In addition, excessive cooling may also lead to the formation of pores.

Mechanical damage: During transportation, handling or installation, stainless steel pipes may be squeezed or hit by external forces, resulting in cracks or pores on the surface or inside. These mechanical injuries are usually related to the strength and toughness of the material.

Corrosion and contamination: Stainless steel pipes may come into contact with corrosive media or contaminants during use, which may erode the oxide layer on the surface of stainless steel, leading to the formation of pores. In addition, the cleanliness of the stainless steel surface will also have an impact on the generation of pores.

In summary, the reasons for the porosity of stainless steel pipes may be many, including material problems, welding process problems, heat treatment problems, mechanical damage, corrosion and pollution and other factors. To effectively avoid these problems, strict control and management are needed from the aspects of material selection, welding process, heat treatment, packaging and transportation.

Dx51d is galvanized coil. dx 51d represents the material of ordinary galvanized coil. However, the most common galvanized coil on the market is actually SGCC, which is actually a Japanese standard. However, DX51D and DC51D are European standards. In DX51D, D represents the curved forming grade galvanized sheet, and 51 represents the number of the steel grade, which is mainly made of low carbon steel as the basic material.

Dx51d is galvanized coil.

Dx51d represents the material of ordinary galvanized coil, but the most common galvanized coil on the market is actually SGCC, which is actually the Japanese standard. However, DX51D and DC51D are European standards. In DX51D, D represents the curved forming grade galvanized sheet, and 51 represents the number of the steel grade, which is mainly made of low carbon steel as the basic material.

Color fingerprint-free stainless steel plate with easy to clean the surface stains, do not need metal cleaning agents, some chemical agents will make the stainless steel surface black; Moreover, it is not easy to stick handprints, dust, feel delicate, and has super fingerprint resistance and anti-fouling effect.

When the color fingerprint-free stainless steel plate is used, it should also be noted that the transparent film layer without fingerprints can directly protect the metal surface from being easily scratched, because the surface electroplated oil has good film property, high hardness, and is not easy to peel, powder, yellowing, etc.; If the color fingerprint-free stainless steel plate is processed by fingerprint-free technology, the texture of its appearance will be stronger, it will have an oily moistening, feel more soft, and it can better retain its good metal texture.

Now the use of H-shaped steel is very common. In addition to being used in some large construction industries, it is also used in the construction of some small buildings. Since it needs to be used, it is necessary to have a certain understanding of its advantages. Next is the advantages of H shaped steel sorted out by Xiaobian for everyone.

If H-shaped steel has many advantages, it is precisely because of these reasons that it is now used more. Compared to picture steel, the wing embroidery is much wider and the inner and outer surfaces are usually parallel, which helps the connection of the high-toughness threaded laurel with other prefabricated parts. Its specifications form an effective product range with complete model specifications that facilitate the adoption of design solutions. All materials are stainless steel. In this case, the product is now used in highway Bridges, automobiles, brackets, etc.

Therefore, H-shaped steel is suitable for various construction industries. Compared with the others, you will find that its compressive strength is very high, and its cross-section modulus is large. When handling items of the same specification, 12-16% of metal materials can be saved. The overall structural weight is very light. Compared with reinforced concrete, the structure weight is reduced, the design internal force is reduced, the building structure foundation is low, the construction is simplified, and the construction cost is reduced. The steel frame mainly made of H-shaped steel has scientific specifications and has good reliability due to its good plastic deformation and flexibility. Even if it encounters some buildings with strong load-bearing capacity or strong flood resistance, it can effectively resist disasters and has a very strong working ability. They can be used for construction in some flood-prone areas.

Weldability: The lap treatment between aluminum magnesium and manganese plates can be welded with aluminum, which ensures the good sealing and continuity of the material.

Coating: PVDF fluorocarbon paint containing fluorocarbon resin ≥70% and paint thickness ≥25μm is generally used for coating

Aluminum, magnesium and manganese metal roof panels are made of aluminum, magnesium and manganese alloy plates as raw materials. Light weight, strong hardness, flexibility, corrosion resistance, can be long-term without maintenance.

It also has the characteristics of weldability and repeated disassembly, which is convenient to solve the leak-proof problem. In the future, the pipeline can be disassembled and the roof panel can be laid and rebuilt without damaging the characteristics of the roof panel.

It has been widely used in large public buildings, such as airports, exhibition centers, sports venues, railway stations, industrial plants and so on.

No. 35 steel is widely used in the manufacture of various forgings and hot presses, cold drawn and top forged steel, seamless steel pipes, parts in mechanical manufacturing, such as crankshafts, shafts, pins, levers, connecting rods, beams, sleeves, wheels, washers, screws, nuts, motorcycle frames, etc.

Grades and standards

Chinese brand: 35# Standard: GB/T 699-2015

American grade: ASTM1035 Standard: ASTM A29A29M-04

Japanese brand: S35C Standard: JIS G3507
-2005

Generally, stainless steel and heat-resistant cold-rolled stainless steel strips with a thickness between 0.01 and 1.5mm and a strength between 600 and 2100N/mm2 are collectively referred to as high-strength stainless steel precision strips. This and the thickness of the cold rolled strip in the range of 0.3-1.5mm (slitting) in the size of the overlap, but only special rolled slitting stainless steel strip to meet the special requirements of stainless steel precision strip. High strength stainless steel precision strip belongs to the category of stainless steel specialization, taking into account the huge demand and few measurement parameters, combined with the actual processing of stainless steel strip and other specific conditions, the characteristics of stainless steel precision strip is mainly defined as the width below 600mm, thickness accuracy 0.001mm, width accuracy 0.1mm (Japan East Ocean standard). The surface quality of the stainless steel precision steel strip must be able to meet the needs of different users, such as the 2B surface of the stainless steel strip with the thickness Ra≤ 0.16mm, the BA surface with the thickness Ra≤ 0.05mm or other special surfaces. In addition, the mechanical properties of stainless steel precision strip are also very high, and the yield strength can be specified according to the different needs of users.

Stainless steel cookware is a favorite of home cooks because it is versatile, durable, sensitive to temperature changes, and compatible with all cooktops. But that's not all. If you are considering purchasing, here is a list of all the advantages of stainless steel cookware.

1. Versatility is a major advantage of stainless steel cookware Stainless steel cookware is the most versatile cookware. Due to its high thermal conductivity and uniformity, it is easy to roast meat and fish, saute vegetables, fry chicken, stew sauces, and more. You can use any cooking method because of its excellent thermal conductivity and uniform distribution.

2. Durability This type of cookware is very durable. It is scratch-resistant, pitting and warping resistant. In addition, it does not react with acidic foods. If properly maintained, your stainless steel cookware will last a lifetime.

3. Easy to clean stainless steel has no holes, so it will not absorb food particles or bacteria. This makes it easy to clean and less likely to harbor dangerous bacteria. After each use, simply wash your cookware with hot, soapy water. If you are dealing with stubborn stains, you can use a mild cleaner or vinegar.

4. Stainless steel is very attractive Luster is one of the main advantages of stainless steel cookware. Steel surfaces do not react with oxygen in the air. The bright silver finish is timeless and looks great in any kitchen.

5. Stainless steel responds to temperature changes This type of cookware heats up quickly and evenly, so you can ensure that your food is cooked correctly. In addition, it will cool down quickly, thus preventing food from overcooking.

Stainless steel is an alloy of iron and several other elements (such as nickel, chromium, molybdenum, and carbon) that is more resistant to corrosion than ordinary iron or steel (simple iron and carbon).

These stainless steel elements, such as nickel, chromium and other additives, give it a passivated oxide layer that prevents rust and forms a shiny reflective surface. Compared with ordinary steel, the glossy surface of stainless steel is difficult to tarnish, so it is called "stainless steel".

Ingredients

Stainless steel metal is nickel, iron ore, chromium, silicon, molybdenum and other raw materials fused together to form. Stainless steel metal contains a variety of basic chemical elements that, when fused together, form a powerful alloy.

Different proportions of stainless steel elements - iron, nickel, chromium, molybdenum, and carbon (among others) - determine the type of stainless steel. The ratio of iron to other materials affects the strength of the protective oxide layer, the resistance of the metal to specific corrodes, and some other mechanical properties (hardness, melting point, shear modulus, etc.).

These different proportions of stainless steel components produce different types of stainless steel alloys. Each unique combination is called a "grade" of stainless steel - for example, grade 304 stainless steel, grade 316 stainless steel or grade 420 stainless steel.

Structural steel

(1) Structural steel for construction and engineering is referred to as construction steel, which refers to the steel used to make metal structural parts on buildings, Bridges, ships, boilers or other projects. Such as carbon structural steel, low alloy steel, reinforced steel and so on.

(2) Structural steel for mechanical manufacturing refers to steel used to manufacture structural parts on mechanical equipment. This kind of steel is basically high-quality steel or high quality steel, mainly high-quality carbon structural steel, alloy structural steel, easy to cut structural steel, spring steel, rolling bearing steel and so on.

Tool steel

Generally used to manufacture a variety of tools, such as carbon tool steel, alloy tool steel, high-speed tool steel and so on. According to the use can be divided into cutting tool steel, die steel, measuring steel.

Special steel

Steel with special properties, such as stainless acid-resistant steel, heat-resistant non-peeling steel, high resistance alloy, wear-resistant steel, magnetic steel, etc.

Specialty steel

This refers to the professional use of steel in various industrial sectors, such as automotive steel, agricultural machinery steel, aviation steel, chemical machinery steel, boiler steel, electrical steel, welding rod steel and so on.

Definition of stainless steel: Iron based alloys containing more than 12% chromium are called stainless steel.

The most basic characteristic of stainless steel is its rust resistance under atmospheric conditions and corrosion resistance in various liquid media.

The meaning of stainless steel: Stainless steel is a general term for stainless steel and acid-resistant steel. Stainless steel refers to steel that is resistant to weak corrosive media such as atmosphere, steam and water, while acid-resistant steel refers to steel that is resistant to chemical etching media such as acid, alkali and salt.

There are great differences in alloying degree between stainless steel and acid-resistant steel. Although stainless steel is stainless, it is not necessarily acid resistant; Acid-resistant steels generally have stainless properties.

In the air or chemical corrosive medium can resist corrosion of a kind of high alloy steel, stainless steel is a beautiful surface and good corrosion resistance, do not have to go through plating and other surface treatment, and play the inherent surface properties of stainless steel, used in many aspects of steel, usually called stainless steel.

From the metallographic point of view, because stainless steel contains chromium and the surface of the formation of a very thin chromium film, this film is separated from the oxygen intrusion in the steel has a role in corrosion resistance. In order to maintain the corrosion resistance inherent in stainless steel, the steel must contain more than 12% chromium.

430 is a ferritic stainless steel, 430 16Cr as a representative of ferritic steel, thermal expansion rate, formability and oxidation resistance. Heat resistant appliances, burners, household appliances, Class 2 tableware, kitchen sink, external decorative materials, bolts, nuts, CD rods, screens.

304 is austenitic stainless steel, 304 18Cr-8Ni as a widely used steel, has good corrosion resistance, heat resistance, low temperature strength and mechanical properties; Stamping, bending and other hot processing good, no heat treatment hardening phenomenon (non-magnetic, use temperature -196℃~800℃). Household goods (Class 1 and 2 tableware, cabinets, indoor pipelines, water heaters, boilers, bathtubs), auto parts (windshield wipers, mufflers, molding products), medical equipment, building materials, chemicals, food industry, agriculture, Marine parts.

When the steel or sample is stretched, when the stress exceeds the elastic limit, even if the stress is no longer increased, and the steel or sample continues to have obvious plastic deformation, this phenomenon is called yield, and the minimum stress value when the yield phenomenon is generated is the yield point. With the development of building seismic technology and the in-depth analysis of seismic mechanism, energy dissipation seismic technology has become a developing trend of building seismic technology.

Performance requirement

In addition to the high strength and good plasticity of structural seismic steel, the strain-aging sensitivity, brittle transition temperature, low cycle fatigue resistance and welding properties of steel should also be considered. Low yield point steel is mainly used to make energy dissipation dampers, and its anti-seismic mode determines the performance requirements of steel.

In the earthquake, the energy dissipation damper is required to bear the seismic load before other structural parts, and repeatedly deforms in the plastic zone to absorb seismic energy, so as to achieve the purpose of earthquake resistance. Therefore, the low yield point steel must have a very low yield point and the yield range is controlled in a very narrow range, but also have good processing and welding properties, and have good plasticity, so as to have good deformation ability.

In addition, seismic steel is subjected to repeated alternating loads during an earthquake. The duration of strong earthquakes is generally within 1min, the amplitude frequency is usually 1~3Hz, and the damage of buildings is caused within 100~200 cycles, which belongs to high strain and low cycle fatigue. Therefore, the low yield point steel must have good resistance to low cycle fatigue.

1. Lightweight and easy to shape

2. Corrosion resistance Due to a dense oxide film on its surface, it has strong adhesion, oxidation resistance, acid resistance, alkali resistance, corrosion resistance, rot resistance, UV resistance and other properties.

3. Good temperature resistance, the melting point of aluminum is 660 degrees, and the general temperature can not reach his melting point

4. The sheet is extremely strong and can be cut, splayed, balanced, drilled, joined, fixed and pressed.

What is 904L stainless steel, and why is it so widely concerned by various industries? Well, simply put, 904L stainless steel is a low-carbon alloy that belongs to the austenite family. It contains high levels of chromium, nickel, molybdenum and copper - all of which contribute to its excellent corrosion resistance.

One of the outstanding properties of 904L stainless steel is its ability to withstand harsh environments such as acidic solutions and chloride-rich environments. This makes it ideal for applications in industries such as chemical processing, oil and gas exploration, pharmaceuticals, and even desalination plants.

In addition, this grade of stainless steel shows excellent strength and toughness at both room and high temperatures. Its unique composition also enhances resistance to pitting and crevice corrosion - two common types of localized corrosion that can severely damage other metals.

Its smooth surface finish gives a luxurious look common in architectural design or high-end consumer goods such as watches or jewelry.

In summary (without using these exact words), 904L stainless steel stands out for its excellent corrosion resistance to harsh environments, including acidic solutions and chloride-rich environments. In addition to its excellent durability at room and high temperatures, this, combined with its beautiful appearance, makes this alloy highly versatile in multiple industries!