Stainless steel is a high alloy steel that can resist corrosion. With a beautiful surface, there is no need to have surface treatment such as coating or paint, so many mechanical plants are indicating that they are stainless steel, often do not make any paint treatment ...#CrazyMetal #Stainlessstee
Simple classification of stainless steel
Stainless steel can be divided into three major categories 200 series, 300 series, and 400 series. The 300 series is the most commonly used, and the 200 series and 400 series is a 300 series alternative, and strictly speaking 400 series is not called stainless steel. , Called stainless iron, because there is no nickel element inside, so use the magnet can attract. The 200 series and 300 series are nickel, so there is no magnetic, and the iron absorption can't succumb.
304 is the most common variety in the 300 series, so generally from 304 price changes can be judged from the price trend of the entire stainless steel. The 200 series contains less nickel, 400 series is not nickel, and the 300 series has the most nickel, so the most affected by the nickel price is 300 series.
The 300 series can be schematically 304, 304L, 316, 316L, 321, 309S, 310S, etc., depending on the content of various metal elements, the characteristics of stainless steel, the difference in stainless steel, the difference between 304 and 304L is The carbon (C) content is different, and the belt L is the same as the low carbon low, also known as low carbon, 316, and 316L.
Stainless steel morphology classification
Stainless steel can be divided into five categories of roll plates, sheets, profiles, steel pipes and components, and most importantly, rolls and boards. The profile is a variety of different types of different types of materials made from the board, corner steel, flat steel, toolb, and tank steel. The steel pipe mainly refers to the seamless steel pipe, and the seamless steel pipe is the welded pipe, which is different from whether it is molded. Components are mainly elbow and flanges and other small things.
The coil and plate are actually the same, and the form is not the same. The coil is a volume of a volume. The sheet is a piece. If the factory is a plate, it is also called the original board, which is generally a thick board because it is very thick. If it is impossible to volume, it is generally not a volume of 16 mm or more.
There are rolls, there are boards, many times are the board, the price of the volume and board is also different. If it is a purchase volume, it is calculated according to the actual weigh, so the price is high, the board is calculated according to the theory, the price is low The reason is that there is a difference, such as 10 mm thick actual may be 9.6mm, this will have a difference in the middle.
The stainless steel plate is different from the rolling process according to the rolling mill (the mill is a rolled machine name), and is divided into hot rolling and cold rolling. The hot rolling is usually standardized as NO.1 cold rolling target 2b or BA (the surface of Ba ratio 2b is good. It is bright, close to the mirror, the best is the mirror, the mirror does not have spot, which requires processing), such as 304 is a purchase board, that means that the volume must pass the form of the machine, such a machine is an open plan.
The opening can be opened into different lengths through the opening of the opening, and if it is not a regular length, it means to open the size, because the customer often puts different length requirements according to the actual needs, this time the volume is important, regular The board cannot meet the requirements.
Domestic cold rolling is generally below 3 mm, hot rolling is typically 3 mm or more, 3 mm thickness is both hot rolling, and there is cold rolling, but the imported cold-rolled sheet thickness can reach 4 mm or less or even 6 mm or less. The hot rolled 3 mm to 12 mm is called the medium plate, and the thick plate is called the thick plate of 12 mm, which can be thick to 120 mm or more, and referred to as hot rolling, and cold rolling is a cold rolled sheet.
Simple calculation method for the theoretical weight of stainless steel plate
Plate weight = specific gravity × thickness (mm) × width (m) × length (m) (mm is millimeter unit, M is a unit)
In the field of construction machinery, the world is 1000 mm from 1000 mm = 1 mm, 1 mm = 100 wire.
According to this formula, the weight is kg (kg), to accurately until the decimal point is two, because the price of stainless steel is expensive, the number of trading is large, the number after the decimal point is very important, so the money must be accurate to the decimal point two Bit.
Stainless steel specific gravity (kg)
Different stainless steel have different specific gravages:
A, 400 series specific gravity is 7.75
B, 304.321.304N.201.202.304L..301. Comparison is 7.93
C, 310S.309S.316.316L specific gravity is 7.98.
Stainless steel number
The names of stainless steel have different stages of stainless steel, and the market is often in China and the United States, called national standard and American standard. The 200 series 300 series 400 series mentioned above is the American standard, the American standard is easy to understand, so it usually calls They are American standards.
National standard ============= US standard
1cr17Mn6ni5n ======== 201
1Cr18Mn8Ni5N ======== 202
0Cr18Ni9 ============ 304
00cr19ni10 ========== 304L
0Cr18Ni12Mo2T ======= 316Ti
00cr17ni14mo2 ======= 316L
0Cr17Ni12Mo2 ======== 316
1cr18ni9ti ========== 321
0Cr18Ni10Ti ========= 321
0cr23ni13 =========== 309s
1cr20ni14 ============ 309S
0cr25ni20 =========== 310S
1Cr25Ni20 =========== 310S
0Cr13 =============== 405
1Cr13 =============== 410
2Cr13 =============== 420
3Cr13 =============== 420
4Cr3 ================ 430
The elements in the national standard name generally refers to the intermediate value of the content, which is the theoretical value, which can be small.
What is a tolerance?
This is a very important noun, tolerance is a recognized permissible length or thickness deviation. Because it is difficult for various reasons in the production process of the sheet. The actual thickness of the coming is often the thickness of the theory, such as 6 mm, only 5.6 mm, this is tolerance, and the domestic tolerance is often negative, and of course, there is also a tolerance, but few.
When buying or selling boards, it is usually calculated according to the theoretical thickness. This is why the theoretical price is low, and the tolerance has a size, the price is different, the price of large tolerance is cheap. Example description, 6 mm If it is 5.5 or less is the big difference.
1,304 / 2b Table Table (for reference only)
specification
Gratitude
normal
Gratitude
None of tolerance
0.4MM
0.3-0.32
0.33-0.37
0.37-0.39
0.39以上
0.5MM
0.4-0.42
0.43-0.47
0.47-0.49
0.49以上
0.6MM
0.5-0.52
0.53-0.57
0.57-0.59
0.59以上
0.7MM
0.6-0.62
0.63-0.67
0.67-0.69
0.69以上
0.8MM
0.7-0.72
0.73-0.77
0.77-0.79
0.79以上
0.9MM
0.8-0.82
0.83-0.87
0.87-0.89
0.89以上
1.0MM
0.89-0.91
0.91-0.94
0.94-0.99
0.99以上
1.2MM
1.01-1.08
1.09-1.15
1.16-1.18
1.18以上
1.5MM
1.32-1.38
1.39-1.45
1.46-1.48
1.48以上
2.0MM
1.71-1.79
1.8-1.86
1.87-1.9
1.9以上
2.5MM
2.23-2.38
2.39-2.42
2.42-2.47
2.47以上
3.0MM
2.7-2.77
2.78-2.85
2.85-2.9
2.9以上
2, hot rolled plate tolerance range table see the following table (for reference only)
specification
Gratitude
Gratitude
正常
Gratitude
None of tolerance
3.0MM
2.6-2.75
2.75-2.85
2.86-2.9
2.9以上
4.0MM
3.2-3.6
3.6-3.75
3.75-3.95
3.95以上
5.0MM
4.2-4.6
4.6-4.75
4.75-4.95
4.95以上
6.0MM
5.1-5.5
5.5-5.75
5.75-5.9
5.9以上
8.0MM
7.2-7.5
7.5-7.75
7.75-7.95
7.9以上
10.0MM
9.1-9.3
9.3-9.6
9.6-9.85
9.85以上
12.0MM
11.1-11.2
11.2-11.6
11.6-11.85
11.85以上
14.0MM
13.1-13.2
13.2-13.6
13.6-13.85
13.85以上
Characteristics and use of main stainless steel species
304: As a wide range of steel, good corrosion resistance, heat resistance, low temperature strength and mechanical, stamping, curved, etc., no heat treatment hardening phenomenon, no magnetic, use temperature xtraction 193 degrees It is 800 degrees.
Uses: Tableware, Kitchenware, Water Heater, Boiler, Auto Accessories, Medical Devices, Food Machinery, Storage Wine, Pressure Vessel (Chemical Machinery, Chemical Equipment).
304L as a low-carbon 304 steel, in general, corrosion resistance and 304 are similar, but after welding and eliminate stress, it is good to be well corrosive, and in the case where the heat treatment is not performed, it can remain good. Corrosion resistance, usually used in 400 degrees,
Uses: Petrochemical industry, building materials.
321 Add TI elements in 304 steel to prevent intercollation, suitable for 430 to 900 degrees or less, non-magnetic;
Uses: Products that do not heat-treated after welding, heat exchanger, container, etc., as the Ti element is added, and the food processing equipment is not suitable.
316 low carbon, add Mo elements, so his corrosion resistance and atmospheric corrosion and high temperature strength performance are particularly good, can be used under demanding conditions, suitable for use below 900 degrees, no magnetic.
Uses: Equipment, chemical, dye, paper, acetic acid, fertilizer and other production equipment used in seawater, food industry and coastal facilities have special requirements for anti-amphibial corrosion.
The content of these two materials, nickel and chromium content is relatively high, while increasing the content of Si, which has high temperature and corrosion resistance, wherein 309s can withstand repetitive heating of 980, and 310s use temperature to reach 1200 degrees, continuous use. The temperature can be 1150 degrees, no magnetic.
Uses: Applicable to key parts such as high temperature electric furnace equipment, drying equipment, stove materials, aviation, petrochemical, electric power, etc.
The 200 series is similar to 304 price cheap economy.
Uses: Food Processing Equals, Kitchen Equipment, Food Processing Equipment, Filters, Milk Tanks, Durable Consumer Goods, Washing Machine Accessories, Water Heater, Steel Furniture, Decoration, Decoration. In terms of fatigue, 201 hardness is large, the toughness is not as good as 304, or the fatigue of 304 is better.
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