Mill test certificate or in short MTC is a test for all steel products, especially sheets. The price of the products are all directly related to the MTC. Steel used in industry often has different names, the most famous of which are st37 sheet and st52 sheet. The differences between these steels have always been considered by activists in this industry, especially knowing the difference between st37 and st53 boards in the steel industry will lead to better use of these products. Below, while we introduce the general classification of steel, let's take a look at the differences and prices of st37 and st52 plates. To introduce different types of steel, the producing countries use special symbols, letters and numbers to introduce them. For example, Germany has standardized all steel according to DIN 17006. Component symbols: This part describes the components, strengths and qualities of the steel in the form of letters and numbers. Common structural steels are identified by the letters St. After these letters, write a number obtained by multiplying this number by 9.81, the steel's minimum tensile strength value in Newtons per square millimeter. Add a hyphen after the strength-related numbers, then enter the grade of steel with the numbers 1 through 3. Level 1: For normal work without typing.Level 2: Important workGrade 3: Slow cast steel with high purity and good weldability.
For example, st37-2 steel: st is the symbol for structural steel, 37 represents the tensile strength of 370 N/mm2, and 2 also represents the steel grade. What is St37 Steel?ST37 steel is also known as low carbon steel in the industry. This is a steel in the mild steel category. In addition, its main application is construction and building profiles. What is ST52 steel?ST52 plate is known as high-strength low-alloy steel in the industry, which is made by adding a small amount of copper, nickel, manganese and other alloys to carbon steel. Due to the addition of the above alloys, the strength of the steel increases. Due to their ease of welding, these steels have countless applications in industry. Check the specifications of the ST37 boardSt37 boards are widely used in construction. Due to its low carbon content, this sheet has moderate strength and is widely used in the construction industry. In addition, the low carbon percentage in these plates improves their weldability. Among the uses of st37 boards can be mentioned the construction of profiles, including profiles and studs. Examine the characteristics of the St52 board ST52 black sheet is one of the widely used sheets in the construction industry. Properties of these plates include high resistance to twisting and bending, elasticity and high load. Among their other properties, we can mention their soldering ability and good machinability. The presence of elements such as silicon and manganese makes this product unique. This product is used to produce strips and squares with equal cross-sections. In Nair Industries, it is used to make rails, chassis for heavy machinery and cranes. The size of the st37 board in Iran is 6*1.5 and 6*2, but the size produced by the European factory is larger.
The difference between board st37 and st52 The main structural steel used in the construction industry is st37 steel. The reason why this steel is used innumerable is its weldability and good mechanical properties. However, in some cases, st52 steel is also used in the construction industry to replace such products. At the same time, the price of st37 board is not much different from the price of st52 board. However, using st52 instead of st37 generally reduces the weight of the steel used in the building. In general, the shape of st52 sheets is lower than the shape of st37 sheets. The reason for this is the high carbon content of the steel used. The specific weight of these steels is the same, but in terms of strength, the st52 plate is more resistant due to the presence of alloying elements. The Manufacturing Method Section: The letters used in this section indicate the steelmaking process, salient features, and casting methods.Process execution section: The letters used in this section indicate the plate's heat treatment, forming method and surface quality. The logo associated with this section is written at the end of the famous steel letters and numbers. In some cases, after the letter attached to the operating part, there is a number indicating its tensile strength in ten grams per square millimeter. softening of cast steelThe identification letters for cast steel are GS. After this symbol there is a dash, then a number which is multiplied by 9.81 to get the minimum tensile strength of cast steel in Newton per square millimeter. To introduce the alloy cast steel, after the characteristic letters GS and a hyphen, a number is written indicating the weight percentage of carbon with a factor of 1.00.
Then the chemical symbols for the other important elements are written in order of weight percent in the alloy and written from highest to lowest according to the available coefficients. At the end of the characteristic designation for casting and structural steels that are expected to be more reliable, dots and numbers are used instead of letters to represent the properties guaranteed by the steel manufacturer. Numbering of materials according to German religion 17007In this system, material specifications are introduced using numbers. The material number consists of 7 digits and its structure is as follows. X XXXX XXThe first digit in the main group material, the next four digits are the type index, and the next two digits are the supplementary digits. main material groupThe most important material groups are identified using single digits and have the following terms:
- 0 = pig iron, iron alloys and cast iron
- 1 = Steel, Cast Steel
- 2 = Heavy non-ferrous metals
- 3 = light metal
- 4-8 = non-metallic materials
- 9 = Free for other or internal use
Type index: The second and third digits from the left indicate the material type. Attached numbers: The sixth digit represents the material number of the steelmaking process, and the seventh digit represents its heat treatment state.
steel sheet price
Among the types of steel sheets, slate is the most widespread. Regarding the name of the board, everyone should know that this name is only a designation in the domestic steel market. Black is not mentioned on this board, and because the board is not glossy and polished, it is called black. The production of ferrous sheets is done by hot rolling, where the ingot is heated to the temperature before it melts until it becomes a paste, then it enters the rolling process, and then it is slowly expanded and flattened into a rectangular cube of increasing length Due to the high temperature of the ingot during the process, the process is cooled with water, and after each rolling step is completed, the output product from each step enters the furnace at the correct temperature. In each step, the distance between the rollers becomes smaller until the distance between the rollers reaches the plate thickness of the last step. The use of different black papersThere are many possible uses for boards, but in general the following can be mentioned:
- body
- floor of the car
- Seal the tube
- Profile type
- tanker
- shipbuilding
- oiled paper
Like the black sheet, the name of the oiled sheet has nothing to do with the oiliness of the surface of this type of sheet, but because the surface of this type of sheet in the market is bright and shiny, it is called an oily sheet. The production process of the oiled plate is carried out by the cold rolling method, and the reason for the completion of the final product is the same production method. The purpose of producing this type of sheet is to achieve a high surface quality and to produce sheets of lower thickness.
The production method of oil plate is that the output product from the hot rolling process (after cooling) enters the pickling process (you can read more details in the next section related to pickling plate), after this process the oil paper is wound again. Next, the coil is placed in a cold rolling mill (usually reciprocating) and the rolling process begins with the expected thickness continuing. Until finally the coil piece is twisted again. The winding process for wrapping the oiled sheet is carried out at this stage to reduce the tension caused by the twisting and trimming of the coil. In some industrial units, an electrolytic water washing process is also carried out to remove grease and surface contamination caused by the cold rolling process. In order to achieve a uniform metallographic structure or expected mechanical properties, the coil can also be annealed depending on the plate type and the place of use. After the cold rolling process and the side and straightening process, the sheet goes to the final straightening process to remove the waves, smooth and trim the edges, and after the work is finished, oil the sheet to prevent the sheet from rusting. Application of oiled paper
- Substrate for the production of galvanized sheet
- Production of household appliances such as gas stoves
- Coating products such as refrigerator coatings
- Pipe production
Syl tablets Another type of layer is the acid washed sheet. After the plate is produced in the hot rolling process, iron oxide is formed on the surface of the plate due to the high temperature of the plate and the continuous spraying of water to the surface during the rolling process for cooling. Now, to remove the oxide shell on the surface of the sheet, it is subjected to a pickling treatment. The process of pickling is to put the board into the appropriate machine and enter the pickling line. In the pickling line, the sheet is passed through an acid tank (usually hydrochloric acid) and when it is finished, it is collected again in roll form. Application of various stain plates
- The basis of oil paper production
- Production of oil and gas pipelines
- for shipbuilding
- Manufacture of car rims and chassis
- Galvanized plate
Since corrosion and rusting of steel sheets has always been a factor of interest, and on the other hand, the production of stainless steel and corrosion-resistant steel sheets is not economically economical for industrial use, galvanized sheets have been produced and manufactured. There are many ways to coat steel, but galvanizing is the most economical method. For the production of galvanized sheets, oiled sheets are used, which work by dipping the oiled sheet in a bath of molten zinc, so that it is placed on the surface of the sheet according to the desired thickness of zinc metal. One of the advantages of galvanized sheet is that it is corrosion resistant in acidic and wet environments, and these sheets do not suffer from corrosion and vulnerability from surface scratches (as much as the thickness of zinc). Application of galvanized sheet
- production of water pipes
- Cabinet production
- Water tank
- Roof production
- coloring page
7Another kind of steel plate is color steel plate. The color sheet is actually a galvanized sheet coated with an electrostatic color coating. Colored steel sheets are produced and sold in 15 different colors and are usually used in the production of shed floors, gazebos and ceilings, in the production of household and office appliances, in the construction of heating and cooling equipment and many other aspects.
The production process of color steel plate is to first feed the galvanized coil into the plate preparation section, and then remove the grease and impurities on the surface of the plate through a process. In the next step, the sheet is passed between working brush rollers to make the surface of the sheet completely smooth and even. After this step, the surface of the sheet was washed with water and dried with hot air. When it is ready, the sheet goes to tinting. Since the color of the steel plate is electrostatic, the term economical paint is of course used for painting purposes, and there is no mention of liquid paint, brushes and brushes. The coloring process begins by dusting a polymer base color in powder form on the upper and lower surfaces of the plate, which is then fed into the oven. After the sheet has cooled, the final color (which can be various materials such as polyester, epoxy, polyvinyl chloride or polyurethane) is applied to the upper and lower surfaces of the sheet with a roller. When this step is completed, the color hardens the stage is re-entered. To learn more about this type of sheet and its properties, you can contact our experts.