May I ask all the prawns, how to distinguish between stainless steel and ordinary steel in the steel

Stainless steel materials are available in the following types:

Model 301 - Good ductility for molded products. It can also be quickly hardened by machining. Good weldability. The wear resistance and fatigue strength are better than those of 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 - General Purpose Model; i.e. 18-8 stainless steel. The GB grade is 0Cr18Ni9.

Model 309 - has better temperature resistance than 304.

Type 316 - after 304, the second most widely used steel grade, mainly used in the food industry and surgical equipment, the addition of molybdenum element to obtain a special corrosion-resistant structure. Because it has better resistance to chloride corrosion than 304, it is also used as "marine steel". SS316 is commonly used in nuclear fuel** installations.

18 grade 10 stainless steel is also generally suitable for this application class. [1]

Model 321 - Similar to 304 except that the addition of titanium reduces the risk of corrosion in the welds of the material.

400 Series - Ferritic and martensitic stainless steels.

Model 408 - Good heat resistance, weak corrosion resistance, 11% CR, 8% NI.

Type 409 - the cheapest model (Anglo-American), commonly used as a car exhaust pipe, is a ferritic stainless steel (chromium steel).

Model 410-martensitic (high-strength chromium steel) with good wear resistance and poor corrosion resistance.

Model 416 - Sulfur added improves the processability of the material.

Type 420 - "Cutting tool grade" martensitic steel, similar to the earliest stainless steel such as Brinell high chromium steel. It is also used for surgical knives and can be made very bright.

Type 430 - Ferritic stainless steel, for decorative purposes, e.g. for car accessories. Good formability, but poor temperature resistance and corrosion resistance.

Type 440 - High strength cutting tool steel with a slightly higher carbon content, with a high yield strength and a hardness of 58 HRC, is one of the hardest stainless steels after proper heat treatment. The most common example of an application is a "razor blade". There are three commonly used models:

440A, 440B, 440C, and 440F (easy to process).

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, also commonly called 17-4; 17%cr，4%ni。, Chromium 18-20.

When it comes to the difference between stainless steel materials, you must first understand the characteristics of each common stainless steel material. 201 stainless steel is the most cost-effective stainless steel material, **cheap, but easy to rust; 304 stainless steel is the most common and widely used stainless steel material, which is not easy to rust, and is relatively high; 316 stainless steel is an imported material, which is used in some high-end equipment, such as aerospace, food machinery and other fields. Let's take a closer look at the differences between these common stainless steel materials.

What is the difference between stainless steel 304 and 201.

In the eyes of many consumers, there is almost no difference between 304 stainless steel and 201 stainless steel, and it is almost impossible to distinguish it with the naked eye.

1. Specifications: Commonly used stainless steel plates are divided into two models: 201 and 304, which are actually different in composition, 304*** some, but **expensive, 201 worse. 304 is imported stainless steel plate, and 201 is domestic stainless steel plate.

The composition is a substitute for 301 steel. It is cold worked to be magnetic, and is used in railway vehicles.

The composition is 18Cr-9Ni, which is the most widely used stainless steel and heat-resistant steel. It is used in food production equipment, Xitong chemical equipment, nuclear energy, etc.

It is high in manganese, the surface is very bright with dark light, and the high manganese content is easy to rust. 304 contains more chromium, and the surface is matte and not rusty. When the two are put together, there is a comparison.

The most important thing is that the corrosion resistance is different, and the corrosion resistance of 201 is very poor, so it is much cheaper. And because 201 has low nickel content, it is lower than 304, so the corrosion resistance is not as good as 304.

Stainless steel can generally be divided into the following according to the metallographic structure

Ferritic stainless steel 400 series, chromium stainless steel, the main representatives are GR13, G17, GR27-30

Austenitic stainless steel 300 series, chromium-nickel stainless steel, mainly represented by 304, 316, 321 and other martensitic stainless steel 200 series, chromium manganese stainless steel, high carbon content, the main representatives are 1gr13 and so on.

Hello, there are many kinds of stainless steel, the common ones are 302 304 316 316L, etc., which are more commonly used.

Stainless steel materials are divided into: chromium stainless steel, chromium-nickel stainless steel and chromium-manganese-nitrogen stainless steel.

1. Ferritic stainless steel. Chromium content 15% 30%. Its corrosion resistance, toughness and weldability improve with the increase of chromium content, and its chloride stress corrosion resistance is better than that of other types of stainless steel.

2. Austenitic stainless steel. The chromium content is greater than 18%, and it also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. It has good comprehensive performance and can resist corrosion of a variety of media.

3. Austenitic-ferritic duplex stainless steel. It combines the advantages of austenitic and ferritic stainless steels with superplasticity. Stainless steel, which has an austenitic and ferritic structure, accounts for about half each.

4. Precipitation hardening stainless steel. The matrix is austenitic or martensitic structure, and the common grades of precipitation hardened stainless steel are 04CR13Ni8Mo2AL and so on.

5. Martensitic stainless steel. High strength, but poor plasticity and weldability.

6. Stainless steel plates and steel belts for pressure-bearing equipment. Stainless steel for pressure vessels has clear requirements for its classification and code, size, shape and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and product quality certificate.

Identification by magnetism: The magnetism of 304 stainless steel is not at the same level as the magnetism of stainless steel of other materials, that is to say, the magnetism of 304 steel always shows weak magnetism.

How to distinguish the material of stainless steel Put stainless steel on the fire is to see if it changes color Whether there is a possibility of rust Okay, stainless steel will not change color.

To identify the stainless steel products ordered by the imported or steel mill, it is generally only necessary to check the marks on the steel or packaging according to the quality certificate of the imported or steel mill.

1. The simple way to distinguish stainless steel materials is to look at the product quality manual or look at the model marking on the packaging. Commonly used markers are as follows:

1) Coloring: paint the color corresponding to the model in the determined part;

2) Printing: Marking specifications and models through steel printing and jet printing.

3) Listing: distinguish the number of specifications and models by hanging cards.

1) Color: chromium-nickel.

The color of stainless steel is silver and jade, and chromium manganese nitrogen stainless steel is similar to chromium nickel, with a slightly lighter color, chrome steel is black, and chromium nickel steel is brownish-white. The pickled stainless steel is silvery-white in color.

2) Chemical identification: copper sulfate is used.

Liquid identification, the oxide layer on the surface of the steel is removed, dripped into water, wiped with copper sulfate, the color does not change to stainless steel, and the purple red color is high manganese steel.

3) Grinding identification: grinding stainless steel with a grinder, observing the sparks, the sparks are streamlined, the knots are many and dense, and they are high manganese steel with high manganese content, and chromium steel or chromium-nickel stainless steel without knots.

How to distinguish the material of stainless steel How to distinguish the material of stainless steel.

Kiss is happy to answer for you: how to distinguish the material of stainless steel How to distinguish the material of stainless steel Answer: We have the following methods for the identification of stainless steel:

Stainless steel whole materials, which are generally ordered by steel mills or imported from abroad and processed commodities with overstocked social reserves. The method of identification of stainless steel is also different. 1 To identify the stainless steel products ordered by the imported or steel mill, generally only need to check the marks on the steel or packaging according to the quality certificate of the imported or steel mill.

The quality certificate is the supplier's confirmation and guarantee of the inspection results of the batch of products. Therefore, the quality certificate must not only state the name, specification, number of pieces delivered, weight and delivery status of the material, but also state all the inspection results of the specified guarantee items. Similarly, in order to facilitate management, avoid confusion and prevent use accidents caused by confusion, the manufacturer marks the brand, batch number, status, specification, quantity and production plant code on the material or packaging.

The mark marked should be consistent with the content of the quality certificate. There are three main marking methods commonly used: coloring (painting the color indicating the grade on the specified part of the material), printing (making a steel seal or jet printing on the specified part of the material to explain the grade, specification, furnace and tank number of the material, etc., which is often used on thick steel plates or large and medium-sized steel), and tagging (hanging signs indicating the grade, batch number, specification, quantity, etc. on the bundle or box of materials).

The logo of stainless steel is generally printed and tagged. 2 Social overstocking of stainless steel. Depending on the length of the overstocking time and the quality of storage, there are generally two situations:

First, the over-storage backlog is not long, and the storage is good, and the processing unit not only keeps the original quality certificate or copy, but also the marks on the steel or packaging are complete and clear. For the identification of this stainless steel, it is also necessary to check the mark on the steel or the packaging according to the quality certificate. Thank you for your patience.

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1. CF3 contains C (carbon content) 3% 304L ZG03CR18NI102, CF8 contains C (carbon content) 8% 304 ZG08Cr18Ni93, CF3M contains C (carbon content) 3% MO 316L4, CF8M contains C (carbon content) 8% MO 316CF8, CF8M, CF3, CF3M are stainless steel castings in the American standard ASTM A351 standard.

CF8 is equivalent to 304

CF3 is equivalent to 304L

CF8m is equivalent to 316

CF3M is equivalent to 316L

304, 304L, 316, 316L are bars or forgings, for example, A182 F316 means that forgings do not have F, such as 316, referring to bar stock.