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What is the introductory knowledge of stainless steel plate, stainless steel coil, and stainless steel grades?

What is the introductory knowledge of stainless steel plate, stainless steel coil, and stainless steel grades?

Time:2022-04-02 Source:Wuxi Jianuo Special Steel Co., Ltd.

Stainless steel definition of stainless steel is a high alloy steel that can resist corrosion. With a beautiful surface, do not have to go through color plating or paint and other surface treatment, so many mechanical plants to show that theirs is stainless steel, often without any paint treatment, and the black material (so-called black material is the general name of the steel) is necessary for anti-rust treatment.

The simple classification of stainless steel stainless steel can be roughly divided into 200 series, 300 series and 400 series of three categories, of which 300 series is the most commonly used, 200 series and 400 series is a certain course of 300 series of alternatives, and strictly speaking 400 series is not called stainless steel, called stainless steel, because it does not contain nickel elements, so the magnet can be attracted. And 200 series and 300 series are nickel, so there is no magnetic, suction iron can not be absorbed.


304 is the most common species in the 300 series, so generally from the price change of 304 can determine the price trend of the entire stainless steel. 200 series contains less nickel, 400 series does not contain nickel, 300 series contains the most nickel, so the most affected by nickel prices is the 300 series.

300 series can be briefly divided into 304, 304L, 316, 316L, 321, 309S, 310S and so on, the basis of distinction is the content of various metal elements are different, the content of different stainless steel characteristics are not the same, 304 and 304L difference is the difference in carbon (C) content, with L is said to contain low carbon, also known as low carbon, 316 and 316L difference is also The same. Stainless steel form classification stainless steel can be divided into five categories: coils, plates, profiles, steel pipes and parts, the most important is the volume and plate. Profiles are a variety of different shaped materials made of plate, there are angles, flat steel, I-beam, channel steel. Steel pipe mainly refers to seamless steel pipe, and seamless steel pipe is the opposite of welded pipe, the difference is whether a forming. Parts mainly refers to elbows and flanges and other small things.

Coil and plate is actually the same, the factory form is not the same, coil is a roll, plate is a sheet, if the factory is a plate, also known as the original plate, generally thick plate, because very thick, it is impossible to become a volume, generally more than 16 mm can not be a volume.

There are volumes, there are plates, many times the plate, volume and plate prices are not the same, if the purchase of volumes, is calculated according to the actual weighing, so the price is high, the plate is calculated according to the theory, the price is low, the reason is that there is under the difference, such as 10mm thick may actually be 9.6mm, which will have a price difference in the middle.

Stainless steel plate according to the mill (mill is the name of the machine rolling plate) rolling process is different, divided into hot-rolled and cold-rolled, hot-rolled usually marked as NO.1 cold-rolled marked as 2B or BA (BA than 2B surface is good, to bright, close to the mirror, the best is the mirror, mirror no spot, are required to process), such as 304 many times is the purchase of the plate, that means the volume must be flattened by machine into the form of plate , this machine is the flattening machine. Through the flattening machine flattening can be opened into different lengths, if not the conventional length is called fixed open, meaning fixed open size, because customers according to the actual needs, often put forward different length requirements, this time the volume becomes important, the conventional plate will not meet the requirements.

Domestic cold-rolled generally below 3 mm, hot-rolled generally above 3 mm, 3 mm thickness of both hot-rolled and cold-rolled, but imported cold-rolled plate thickness can reach below 4 mm or even below 6 mm. Hot-rolled 3 mm to 12 mm plate called medium plate, 12 mm or more called thick plate, can be thicker than 120 mm, and called hot-rolled medium-thick plate, and cold-rolled is cold-rolled thin plate. The simple calculation of the theoretical weight of stainless steel plate plate weight = specific gravity × thickness (mm) × width (m) × length (m) (mm is the unit of millimeters, m is the unit of meters) in the field of construction machinery due to the precision of the size, the world is using millimeters as the unit 1000 mm = 1 meter, 1 mm = 100 silk.

The weight derived from this formula is kilogram (KG), to be accurate to two decimal places, because stainless steel is expensive, the transaction volume, the number after the decimal point is also very important, so the money should also be accurate to two decimal places. The specific gravity of stainless steel (KG) different stainless steel has different specific gravity: A, 400 series specific gravity is 7.75B, 304.321.304N.201.202.304L..301. specific gravity is 7.93C, 310S.309S.316.316L specific gravity is 7.98. with steel number cross-reference table of the world’s countries have different names for stainless steel, the market often Contact is China and the United States, called the national standard and the American standard, the above-mentioned 200 series 300 series 400 series is the American standard, the American standard because of the common understanding, so usually called the American standard.

National Standard ============ American Standard



















The element content in the national standard designation generally refers to the middle value of the content, for the theoretical value, which can be large or small. What is meant by tolerance This is a very important term, tolerance is recognized as the allowable length or thickness deviation. Because in the production process of the plate, for various reasons it is difficult. Out of the actual thickness is often not up to the theoretical thickness, such as 6 mm board, only 5.6 mm, which is the tolerance, in the domestic tolerance is often negative tolerance, of course, there are positive tolerances, but rarely. In the sale of the board, usually according to the theoretical thickness to calculate, which is why the theoretical price is lower than the price of weighing, tolerance and the size of the difference, the price is not the same, the price of large tolerance is cheaper. For example, 6 mm, if the following is 5.5 is a large tolerance. 1, 304/2B tolerance range is shown in the table below (for reference only)

Specifications large difference normal small difference no tolerance

0.4MM 0.3-0.32 0.33-0.37 0.37-0.39 0.39 or more

0.5MM 0.4-0.42 0.43-0.47 0.47-0.49 0.49 or more

0.6MM 0.5-0.52 0.53-0.57 0.57-0.59 0.59 or more

0.7MM 0.6-0.62 0.63-0.67 0.67-0.69 0.69 or more

0.8MM 0.7-0.72 0.73-0.77 0.77-0.79 0.79 or more

0.9MM 0.8-0.82 0.83-0.87 0.87-0.89 0.89 or more

1.0MM 0.89-0.91 0.91-0.94 0.94-0.99 0.99 or more

1.2MM 1.01-1.08 1.09-1.15 1.16-1.18 1.18 or more

1.5MM 1.32-1.38 1.39-1.45 1.46-1.48 1.48 or more

2.0MM 1.71-1.79 1.8-1.86 1.87-1.9 1.9 or more

2.5MM 2.23-2.38 2.39-2.42 2.42-2.47 2.47 or more

3.0MM 2.7-2.77 2.78-2.85 2.85-2.9 2.9 above 2. Hot rolled sheet tolerance range table is shown in the following table (for reference only)

Specification Large difference Normal Small difference No tolerance

3.0MM 2.6-2.75 2.75-2.85 2.86-2.9 2.9 or more

4.0MM 3.2-3.6 3.6-3.75 3.75-3.95 3.95 or more

5.0MM 4.2-4.6 4.6-4.75 4.75-4.95 4.95 or more

6.0MM 5.1-5.5 5.5-5.75 5.75-5.9 5.9 or more

8.0MM 7.2-7.5 7.5-7.75 7.75-7.95 7.9 or more

10.0MM 9.1-9.3 9.3-9.6 9.6-9.85 9.85 or more

12.0MM 11.1-11.2 11.2-11.6 11.6-11.85 11.85 or more

14.0MM 13.1-13.2 13.2-13.6 13.6-13.85 13.85 above the characteristics and uses of the main types of stainless steel 304: as a widely used steel, has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, stamping, bending and other hot workability, no heat treatment hardening phenomenon, non-magnetic, the use of the temperature of minus 193 degrees to positive 800 degrees. Uses: tableware, kitchenware, water heaters, boilers, auto parts, medical equipment, food machinery, storage wine ware, pressure vessels (chemical machinery, chemical equipment).

304L as low carbon 304 steel, in general state, corrosion resistance and 304 almost, but after welding and stress relief, it resists intergranular corrosion well, in the absence of heat treatment, also can maintain good corrosion resistance, generally used at 400 degrees, uses: petrochemical industry, building materials.

321 in 304 steel added Ti elements to prevent intergranular corrosion, suitable for positive 430 to below 900 degrees, non-magnetic; uses: automotive exhaust, heat exchangers, containers and other products that are not heat-treated after welding, due to the addition of Ti elements, it is not suitable for making food processing equipment.

316 low carbon, add MO elements, so his corrosion resistance and atmospheric corrosion resistance and high temperature strength performance is particularly good, can be used in harsh conditions, suitable for use below 900 degrees, non-magnetic. Uses: equipment used in seawater, chemical, dye, paper, acetic acid, fertilizer and other production equipment, food industry and coastal area facilities, products with special requirements against intergranular corrosion.

309S/310S two materials, nickel and chromium content is relatively high, while increasing the content of Si, so that it has high temperature resistance and corrosion resistance, which 309S can withstand repeated heating below 980, 310S use temperature up to 1200 degrees, continuous use temperature can be 1150 degrees, non-magnetic. Uses: Applicable high-temperature electric furnace equipment, drying equipment and other key parts, furnace materials, aviation, petrochemical, electric power, etc.

200 series similar to 304 cheap price economy. Uses:Food processing utensils, kitchen equipment, food processing equipment, filters, milk cans, durable consumer goods, washing machine parts, water heaters, steel furniture, architectural decoration, decoration. Fatigue resistance, 201 hardness is greater, toughness is not as 304, or 304 fatigue resistance is better.