FAQ

Calculation formula of theoretical weight of stainless steel plate
Weight (kg) = thickness (mm) × width (mm) × length (mm) × density value
The density of stainless steel is 7.93
Corresponding material: 201,202,301,302,304,304L,305,321
Stainless steel density 7.75
Corresponding material: 405,410,420
Stainless steel 7.98
Corresponding materials: 309S, 310S, 316S, 316L, 347

The calculation formula of the theoretical weight of stainless steel pipe:
Steel pipe (including seamless steel pipe and welded steel pipe) (kg/m) W= 0.02466 ×S (D – S)
D = outer diameter S = wall thickness
For example: a seamless steel pipe with an outer diameter of 60 mm and a wall thickness of 4 mm, find the weight per m. Weight per m = 0.02466 ×4 ×(60 –4)=5.52kg

There are several types of stainless steel materials:
Model 301-good ductility, used for molded products. It can also be hardened by mechanical processing. Good weldability. Abrasion resistance and fatigue strength are better than 304 stainless steel.
Model 302-corrosion resistance is the same as 304, and the strength is better due to the relatively high carbon content.
Model 303-By adding a small amount of sulfur and phosphorus, it is easier to cut than 304.
Model 304-universal model; namely 18/8 stainless steel. The GB grade is 0Cr18Ni9.
Model 309- has better temperature resistance than 304.
Model 316-after 304, the second most widely used steel grade, mainly used in food industry and surgical equipment, adding molybdenum element to obtain a special corrosion-resistant structure. Because it has better resistance to chloride corrosion than 304, it is also used as "ship steel". SS316 is usually used in nuclear fuel recovery devices. 18/10 grade stainless steel usually also meets this application level. [1]
Model 321-Except for the addition of titanium to reduce the risk of corrosion of the material welds, other properties are similar to 304.
400 series-ferritic and martensitic stainless steel
Model 408-Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.
Model 409-the cheapest model (British and American), usually used as a car exhaust pipe, is a ferritic stainless steel (chrome steel).
Model 410-Martensite (high-strength chromium steel) has good wear resistance and poor corrosion resistance.
Model 416-added sulfur to improve the processing performance of the material.
Model 420-"tool grade" martensitic steel, similar to the earliest stainless steel such as Brinell high chromium steel. It is also used for surgical knives, which can be very bright.
Model 430-Ferritic stainless steel, for decoration, such as car accessories. Good formability, but poor temperature resistance and corrosion resistance.
Model 440-High-strength cutting tool steel with slightly higher carbon content. After proper heat treatment, higher yield strength can be obtained. The hardness can reach 58HRC, which is among the hardest stainless steels. The most common application example is the "razor blade". There are three commonly used models: 440A, 440B, 440C, and 440F (easy processing type).
500 series-heat-resistant chromium alloy steel.
600 series-martensitic precipitation hardening stainless steel.
Model 630-the most commonly used precipitation hardening stainless steel model, usually also called 17-4; 17% Cr, 4% Ni. , Chrome 18-20.

Several identification methods of stainless steel（一）

Physical identification is to determine whether it is stainless steel with the help of simple instruments and the senses according to the inherent physical and chemical properties of the product (including the whole material, residual material, waste, etc.) when the steel grade (number) is unknown. And the specific method of which type of stainless steel.

It should be pointed out that sensory identification cannot distinguish the specific steel (type) number, but can only basically distinguish three major categories of chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel. The identification methods are as follows:

Identification of color ：The pickled stainless steel has a silvery white and smooth surface color: chromium-nickel stainless steel is silvery white and jade; chromium stainless steel is slightly grayish and weak; the color of chromium-manganese-nitrogen stainless steel is similar to that of chromium-nickel stainless steel. The surface color of unpickled stainless steel: chrome-nickel steel is brown-white, chrome steel is brown-black, and chromium-manganese-nitrogen is black (these three colors refer to the more heavily oxidized colors). Cold-rolled unannealed chromium-nickel stainless steel, with silver-white reflective surface.

Identifying with iron magnets： Magnets can basically distinguish two types of stainless steel. Because chromium stainless steel can be attracted by magnets in any state; chromium-nickel stainless steel is generally non-magnetic in the annealed state, and some will be magnetic after cold working. However, high manganese steel with higher manganese content is non-magnetic; the magnetic situation of chromium-nickel-nitrogen stainless steel is more complicated: some are non-magnetic, some are magnetic, and some are non-magnetic in the longitudinal plane and magnetic in the transverse plane. Therefore, although magnets can basically distinguish between chromium stainless steel and chromium-nickel stainless steel, they cannot correctly distinguish some special steel grades, let alone specific steel grades.

Update other authentication methods tomorrow！

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Stainless steel sheet/plate is versatile and used in a variety of applications. It is primarily selected for its resistance to corrosion, longevity and formability. Typical uses of stainless steel sheet/plate include, construction, food service applications, transportation, chemical, marine, and textile industries.

Since Type 316 stainless steel alloy contains molybdenum bearing it has a greater resistance to chemical attack than 304. Type 316 is durable, easy-to-fabricate, clean, weld and finish. It is considerably more resistant to solutions of sulfuric acid, chlorides, bromides, iodides and fatty acids at high temperature.

304 stainless steel is the most common form of stainless steel used around the world due to excellent corrosion resistance and value. 304 can withstand corrosion from most oxidizing acids. That durability makes 304 easy to sanitize, and therefore ideal for kitchen and food applications.

Stainless steel is more expensive to produce because of the addition of the variety of alloying elements, such as iron, chromium, nickel, manganese and copper. ... The chromium attaches itself to oxygen more readily than iron and thus creates a chromium oxide layer which protects the metal from degradation.

Stainless steel cookware is generally recognized as a safe material for cookware. Any good quality stainless steel, be it 304 or 316 stainless steel, is a better choice than most of the other available materials. For example, coated aluminum pans lose their non-stick over time.