Is the so called 304 stainless steel a national standard or a foreign grade?

American Grade: ASTM304, 304 stainless steel is a grade of stainless steel produced in accordance with American ASTM standards.

Chinese grade: 0Cr18Ni9 (old grade), Chinese grade: 06Cr19Ni10 (new grade) China's stainless steel grades are composed of chemical composition and numbers, but it is not easy to remember.

So usually we call it American and Japanese brands, and they are all composed of numbers and letters.

304 is a versatile stainless steel that is widely used in equipment and parts that require good overall properties (corrosion resistance and formability). In order to maintain the corrosion resistance inherent in stainless steel, the steel must contain more than 18% chromium and more than 8% nickel.

This is a Japanese brand! China's own grade is 06CR19NI10.

304 is a stainless steel grade, not a grade.

Stainless steel is usually divided into a variety of models such as S, 310S, etc. Among them, S and 310S belong to austenitic stainless steel, which does not contain magnetism and can withstand corrosion of a variety of media, and belongs to martensitic stainless steel, which has high magnetism and strength, but poor plasticity and weldability.

1. What is stainless steel.

Stainless steel is the abbreviation of stainless acid resistant steel, and the steel grade that is resistant to weak corrosive media such as air, steam, and water or has stainless steel is called stainless steel; The steel that is resistant to corrosion by chemically corrosive media (acid, alkali, salt and other chemical corrosion) is called acid-resistant steel.

Stainless steel is often divided into martensitic steel, ferritic steel, austenitic steel, austenitic-ferritic (duplex) stainless steel and precipitation hardening stainless steel according to the microstructure. In addition, it can be divided into chromium stainless steel, chromium-nickel stainless steel and chromium-manganese-nitrogen stainless steel according to the composition.

Second, the main components of stainless steel.

The corrosion resistance of stainless steel decreases with the increase of carbon content, therefore, the carbon content of most stainless steels is low, and the maximum is not exceeded, and some steels even have a C (carbon content) lower than e.g. 00Cr12). The main alloying element in stainless steel is CR (chromium), and only when the CR content reaches a certain value, the steel is corrosion-resistant. Therefore, stainless steel generally has a cr (chromium) content of at least.

Stainless steel also contains elements such as Ni, Ti, Mn, N, Nb, Mo, Si, and Cu.

Summary. Dear, hello, the difference between national standard and non-standard lies in four aspects: production standards, application scope, and product quality. 1. The production standards are different, the national standard products are produced in strict accordance with the national standards, even if there are errors, they are also within the allowable range, and the non-standard products are produced in accordance with the standards agreed with customers or do not meet the provisions of the national standards.

The quality of 304 stainless steel plate and 304 stainless steel strip is similar, mainly due to the difference in thickness, content and mechanical properties. For example, the actual thickness of the national standard 304 stainless steel plate is 1mm, while the actual thickness of the non-standard 304 stainless steel plate is only or less than 1mm.

Dear, hello, the difference between national standard and non-standard lies in four aspects: production standards, application scope, and product quality. 1. The production standards are different, the national standard products are produced in strict accordance with the national standards, even if there are errors, they are also within the allowable range, and the non-standard products are produced in accordance with the standards agreed with customers or do not meet the provisions of the national standards. The quality of 304 stainless steel plate and 304 stainless steel strip is similar, mainly due to the difference in thickness, content and mechanical properties.

For example, the actual thickness of the national standard 304 stainless steel plate is 1mm, while the actual thickness of the non-standard 304 stainless steel plate is only or less than 1mm.

2. Under the premise of different sizes and specifications, the national standard products are higher than the non-standard products. 3. The scope of application is different, and the requirements for products produced in accordance with national standards are more stringent, and they are generally used in some formal enterprises and some application scenarios with stricter requirements, while non-standard products are used in some small and micro enterprises or specific application scenarios. 4. The product quality is different, and the national standard products have stricter requirements for material selection and process, so the product quality is much higher than that of non-standard products.

Dear users, stainless steel 304 is generally divided into several grades such as 304L, 304H, 304LN, 304N, etc.: 1304L Stainless Steel:

Pay attention to welding performance, low carbon content, use optimized welding technology, avoid overheating of materials during the welding process, and reduce intergranular corrosion. 2.304H Stainless Steel:

High strength at high temperature, but at the same time, the corrosion resistance of stainless steel is reduced, between ordinary 304 and high-grade stainless steel 321, suitable for some accessories of high-temperature stoves, high-temperature equipment, and industrial stoves. 3.304LN Stainless Steel:

Due to the addition of titanium and boron elements, the strength has been improved, and the brittleness during cold working has been reduced, the welding performance has been improved, and the superior corrosion resistance has been widely used in the chemical industry. 4.304N Stainless Steel:

The nitrogen content is increased, the strength and plasticity are greatly improved, the tensile strength and yield strength are high, and the wear resistance and heat resistance are high. Stainless steel 304 is suitable for all kinds of stainless steel products in daily life, such as kitchen utensils, dining utensils, etc., and is also suitable for industrial products, medical equipment and other applications. It is important to note that different grades are suitable for different environments and conditions, and it is important to choose the right stainless steel grade. 

The difference between the national standard 304 stainless steel pipe and the American standard 304 stainless steel pipe is mainly in the element content, the national standard 304 stainless steel pipe has 8 nickel content and more than 18 chromium content, while the American standard 304 stainless steel pipe has 9 nickel content and more than 19 chromium content; In addition, the C content and P content in the national standard 304 stainless steel pipe are lower than those in the American standard 304 stainless steel pipe. I hope mine can help you.

304 stainless steel is a general-purpose stainless steel material with the following chemical compositions:

C (Carbon), Si (Sil) 1 %, Mn (Manganese) 2%, P (Phosphorus) S (Sulfur) Cr (Chromium): 18-20%, Ni (nickel) 8-11%.

The anti-rust performance of 304 stainless steel is stronger than that of stainless steel materials of 200 series. 304 stainless steel has excellent stainless corrosion resistance and good intergranular corrosion resistance. p-oxidizing acids, in experiments it is obtained:

Concentration of nitric acid below the boiling temperature of 65%, 304 stainless steel has strong corrosion resistance.

It also has good corrosion resistance to alkaline solutions and most organic acids and inorganic acids. Steel grade: 0cr18ni9, density:

grams cubic centimeters, physical properties: tensile strength b (mpa) 520, conditional yield strength mpa) 205, elongation δ5 ( 40, section shrinkage 60, hardness: hb 187; hrb≤90;hv ≤200。