What are the characteristics of 304 stainless steel, 410 stainless steel and 400 stainless steel?

1. 304 stainless steel is austenitic stainless steel and is non-magnetic.

304 stainless steel is a common material in stainless steel with a density of 7.93 g/cm3. It is also called 18/8 stainless steel in the industry. It is resistant to high temperatures of 800°C and has the characteristics of good processing performance and high toughness. It is widely used in industry, furniture decoration industry, food and medical industry.

Common marking methods on the market include 06Cr19Ni10 and SUS304. 06Cr19Ni10 generally indicates production according to national standards, 304 generally indicates production according to ASTM standards, and SUS 304 indicates production according to Japanese standards.

304 is a versatile stainless steel that is widely used to make equipment and parts that require good comprehensive properties (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 18% chromium and more than 8% nickel. 304 stainless steel is a brand of stainless steel produced in accordance with American ASTM standards.

1. Application scope of 304 stainless steel:

System description: 304 stainless steel is the most widely used chromium-nickel stainless steel. As a widely used steel, it has good Corrosion resistance, heat resistance, low temperature strength and mechanical properties; good hot workability such as stamping and bending, no heat treatment hardening phenomenon (use temperature -196°C ~ 800°C).

It is resistant to corrosion in the atmosphere. If it is an industrial atmosphere or a heavily polluted area, it needs to be cleaned in time to avoid corrosion. Suitable for food processing, storage and transportation. Has good processing performance and weldability.

Plate heat exchangers, corrugated pipes, household products (Class 1 and 2 tableware, cabinets, indoor pipelines, water heaters, boilers, bathtubs), auto parts (windshield wipers, mufflers, molded products), medical equipment , building materials, chemicals, food industry, agriculture, ship parts, etc. 304 stainless steel is a nationally recognized food-grade stainless steel.

Most usage requirements are to maintain the original appearance of the building for a long time. When determining the type of stainless steel to choose, the main considerations are the required aesthetic standards, the corrosive nature of the local atmosphere, and the cleaning regime to be adopted. Increasingly, however, other applications are simply seeking structural integrity or impermeability. For example, roofs and side walls of industrial buildings.

In these applications, the cost of construction to the owner may be more important than aesthetics, and it is okay if the surface is not very clean. The effect of using 304 stainless steel in dry indoor environments is quite good. However, maintaining its appearance outdoors in the countryside and cities requires frequent cleaning. In heavily polluted industrial areas and coastal areas, the surface will be very dirty and even rusty.

But to obtain the aesthetic effect in an outdoor environment, nickel-containing stainless steel is needed. Therefore, 304 stainless steel is widely used in curtain walls, side walls, roofs and other construction purposes. However, in severely corrosive industries or marine atmospheres, it is best to use 316 stainless steel. Stainless steel sliding doors, people have fully realized the advantages of using stainless steel in structural applications. There are several design guidelines that include 304 and 316 stainless steel.

Because "duplex" stainless steel 2205 has integrated good atmospheric corrosion resistance with high tensile strength and elastic limit strength, this steel is also included in the European standards. Product shape In fact, stainless steel is manufactured in full standard metal shapes and sizes, and there are many special shapes.

The most commonly used products are made of thin plates and strips, and medium and thick plates are also used to produce special products, such as the production of hot-rolled structural steel and extruded structural steel. There are also round, oval, square, rectangular and hexagonal welded pipes or seamless steel pipes and other forms of products, including profiles, bars, wires and castings.

2. 400 series stainless steel is martensitic stainless steel and is magnetic.

400 series stainless steel is a stainless steel grade produced in accordance with American ASTM standards, equivalent to my country's 1Cr13 stainless steel, S41000 (American AISI, ASTM). Contains 0.15% carbon and 13% chromium.

410 stainless steel: has good corrosion resistance and machinability, and is suitable for general-purpose blades and valves. 410 stainless steel heat treatment: solution treatment (℃) 800-900 slow cooling or 750 fast cooling.

Chemical composition of 410 stainless steel: C≤0.15, Si≤1.00, Mn≤1.00, P≤0.035, S≤0.030, Cr=11.50~13.50.

1. Characteristics of 400 series stainless steel:

1) High strength;

2) Excellent machinability;

3) It hardens after heat treatment;

4) It is magnetic;

5) It is not suitable for harsh corrosive environments.

2. Scope of application of 400 series stainless steel:

General knife blades, mechanical parts, Class 1 tableware (spoons, forks, knives, etc.).

Extended information:

1. 304 stainless steel product standards:

1. International stainless steel marking method

The American Iron and Steel Institute uses three Digits are used to designate various standard grades of forgeable stainless steel. Among them:

①Austenitic stainless steel is marked with 200 and 300 series numbers. For example, some of the more common austenitic stainless steels are marked with 201, 304, 316 and 310.

② Ferritic and martensitic stainless steels are represented by 400 series numbers.

③ Ferritic stainless steel is marked with 430 and 446, martensitic stainless steel is marked with 410, 420 and 440C,

④ Duplex (austenite-iron (Body), stainless steel, precipitation hardened stainless steel and high alloys with an iron content of less than 50% are usually named after patented names or trademarks.

2. Classification and grading of standards

2-1 Grading classification:

①National standard GB

②Industry standard YB< /p>

③Local standards?

④Enterprise standards Q/CB

2-2 Category:

①Product standards

< p>②Packaging standards

③Method standards?

④Basic standards

2-3 Standard level (divided into three levels):