Stainless steel 441 is commonly known as, what is the material of stainless steel 439

SUS441 stainless steel is equivalent to domestic 022Cr18NBTI stainless steel.

SUS441 (022Cr18NBTI) ferritic stainless steel has a very low carbon and nitrogen content, and trace amounts of beneficial alloying elements Nb and Ti are added. The lattice structure of SUS441 (022Cr18NBTI) ferritic stainless steel is body-centered cube, and its octahedral gap radius is only times the radius of Fe atoms (face-centered cube is times), and the ability to contain gap compound particles is poor. Therefore, the carbonitride particles of Nb and Ti are easily dispersed and distributed in the base metal, which improves the comprehensive properties of stainless steel.

The affinity between Ti and N in stainless steel is greater than that of Nb, and the affinity between Nb and C is greater than that of C, so there are a large number of diffusely distributed TIN and NBC second phase particles in 022Cr18NBTI ferritic stainless steel, which not only play the role of second phase strengthening, but also play a role in inhibiting over-coarsening of grains and improving the weldability of the material during welding thermal cycling (3). Under the condition of adopting appropriate welding process parameters, the grain size of the weld and the heat-affected zone can be controlled at more than level 4, and has good mechanical properties to meet the requirements of use.

1. Summary Very low C, N, add Ti and Nb, improve the high temperature strength, corrosion resistance, weldability and processability of the material. TISCO specially developed steel grades. 2. Features 1) High temperature corrosion resistance; 2) weldability; 3) High strength at high temperature; 4) Magnetic; 5) Excellent processability.

3. Scope of application: exhaust manifold, front pipe, converter, etc. of automobile exhaust system.

1. Performance requirements of ferritic stainless steel at the high temperature end of the automobile exhaust system The ambient temperature of the manifold and the front pipe of the automobile exhaust system can reach 750 900, and the local temperature may reach 950, and the high temperature performance of the material such as high temperature strength and high temperature fatigue performance is required. However, as the emission level increases, the engine performance improves, the exhaust temperature rises, and due to the need to reduce the weight of components, especially for three-way catalytic units, the use of ferritic stainless steel manifolds can quickly improve the catalytic efficiency.

2. Ferritic stainless steel grades for the high temperature end (exhaust manifold) of the automobile exhaust system At present, the main ferritic stainless steel used for the high temperature end is 429, 441, 444, of which 429 and 444 are mainly used in Japanese cars, and 441 is mainly used in Europe and the United States.

441 is a high-strength cutting tool steel with slightly higher carbon content and better corrosion resistance. After proper heat treatment, a high yield strength can be obtained, and the hardness can reach 58HRC, which is one of the hardest stainless steels. The most common example of an application is a "razor blade".

SUS441 is made of stainless steel. The steel grade that is resistant to weak corrosive media such as air, steam, 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. Due to the difference in chemical composition between the two, their corrosion resistance is different, ordinary stainless steel is generally not resistant to chemical corrosion, while acid-resistant steel is generally stainless steel.

SUS441 is made of stainless steel. SUS441 (022Cr18NBTI) ferritic stainless steel has a very low carbon and nitrogen content, and trace amounts of beneficial alloying elements Nb and Ti are added.

Due to the difference in chemical composition between the two, their corrosion resistance is different, ordinary stainless steel is generally not resistant to chemical corrosion, while acid-resistant steel is generally stainless steel. The term "stainless steel" does not simply refer to one type of stainless steel, but to more than a hundred industrial stainless steels, each developed with good performance in its specific application area.

Overview Very low C, N, Ti and Nb are added to improve the high temperature strength, corrosion resistance, weldability and processability of the material. TISCO specially developed steel grades. 2. Features 1) High temperature corrosion resistance; 2) weldability; 3) High strength at high temperature; 4) Magnetic; 5) Excellent processability.

410 stainless steel belongs to the general martensitic stainless steel and does not represent food grade, but 410 stainless steel can be made into food-grade products。410 stainless steel contains carbon and chromium 13%, has good corrosion resistance and machinability, and is generally used for blades and valves.

410 stainless steel can be used when cooking and stir-frying, but it is mostly used for knives, knives and forks or small spoons. Compared to stainless steel for cooking, it is important to ensure that the chromium content does not exceed the standard. Although 410 stainless steel can also meet these requirements, it is better to use 304 steel.

Precautions for the use of stainless steel products

401 stainless steel is generally used in some places where the hardness is relatively high but not the good anti-rust ability, and 401 can be used at this time. In the process of using stainless steel pots, remember to cook or store acidic things, and must not choose to use stainless steel to boil traditional Chinese medicine, traditional Chinese medicine contains some bad ingredients, so do not choose this utensil to boil.

In the process of using stainless steel, it must not be burned empty, if it is burned dry, it will make the metal plating on the surface of the pot aging, which will greatly affect the service life.

439 stainless steel is based on 430 with titanium and niobium, and then the carbon content is reduced, so as to improve the processing performance, welding corrosion resistance.

1. Corresponding grades of 439 stainless steel: 1. National standard GB-T standard: digital grade:

S11863, new grade: 022Cr18Ti, old grade: 00Cr17,2, American standard:

ASTMA Standard: S43035, SAE Standard: 430Ti, UNS Standard:

439,3, Japanese standard JIS standard: SUS430LX, 4, German standard DIN standard: 5, European standard EN standard:

x3crti17。

2. Chemical composition of 439 stainless steel: carbon C: , silicon Si:, manganese Mn: , phosphorus P: , sulfur S: chromium Cr:, nickel Ni: charge allowed, molybdenum Mo:, nitrogen N:—, copper Cu:—, other elements:

Ti or NB:.

3. Physical properties of 439 stainless steel: density density (20).

kg, melting point :—specific heat capacity (0 100 ) kg (, thermal conductivity w (

100 , thermal conductivity w (

500 -: coefficient of linear expansion.

10-6/k)

0 100 , linear expansion coefficient (10-6 k).

0 579 :, resistivity (20).

ω.mm2 m), longitudinal modulus of elasticity.

20) GPA:200, Magnetic:Yes.

4. Mechanical properties of 439 stainless steel: Delivery status: bar solution treatment, plate solution pickling, tensile strength (rm mpa):

365, Elongation strength (:175, elongation a %: 22, section shrinkage (z %):

One. 5. 439 stainless steel heat treatment: Hardness HBW: annealing 183, hardness HRB: 88, Heating temperature: 780 950, Heating method: air cooling or slow cooling.

439 stainless steel applications: manufacturing warm water sinks, hot water ** appliances, sanitary appliances, durable machines for household use, etc.

The 439 steel grade is based on the ordinary ferrite material (430) to reduce the content of C, and at the same time add TI and other stabilization elements, so that the intergranular corrosion resistance, formability and weldability of the steel grade are improved. Compared with 304 steel grade, although the elongation is lower (about 30%), the strength and corrosion resistance are comparable, and the corrosion resistance is better than that of 200 series materials.

What is the current market price of scrap 439 stainless iron?

410 stainless steel is better. The main reasons are as follows:

1. Like other stainless steel materials, 410 stainless steel has very good strength and good performance. The strength of 304 stainless steel is not as good as that of 410, and it is easy to be damaged during use.

The safety performance of stainless steel is very good, so it is widely used in the automobile transportation industry. 304 is relatively heavy, so it is generally not used in some small household windows and daily use items.

Stainless steel has strong pit corrosiveness and can be widely used in some special industries, while 304 does not have such good oxidation resistance and is easy to rust and be corroded.

Summary. Hello, 304 is an austenitic stainless steel, which is the most widely used steel grade, with good corrosion resistance, heat resistance, low temperature strength and mechanical properties.

Hello, 304 is an austenitic stainless steel, which is the most widely used steel grade, with good corrosion resistance, heat resistance, low temperature strength and mechanical properties.

Austenitic stainless steel: Stainless steel with an austenitic structure at room temperature. The steel contains about 18% Cr, 8% Ni 10%, and C about 10%, and has a stable austenite structure.

Austenitic chromium-nickel stainless steels include the well-known 18Cr-8Ni steels and high-Cr-Ni series steels developed by adding Cr and Ni content and adding MO, CU, SI, NB, Ti and other elements. Austenitic stainless steel is non-magnetic and has high toughness and plasticity, but the strength is low, and it is impossible to strengthen it by phase change, and can only be strengthened by cold working. If S, Ca, Se, Te and other elements are added, it has good machinability.

445 ferritic stainless steel is an alloy of iron, carbon and chromium, which does not contain Ni, while the content of Cu and Cr is higher, and the content of mixed Mo is lower. NB and Ti double stable pin has a significant impact on the performance of 445, so that it has a good comprehensive performance (forming and welding performance, etc.), can avoid post-welding intergranular corrosion, improve the strength and corrosion resistance of 445 stainless steel, has excellent resistance to chloride stress corrosion, its annealed state in chloride aqueous solution is almost immune to stress corrosion, with the normal magnetic characteristics of the positive training bucket, has a strong resistance to high temperature oxidation, can meet the requirements of the solar energy industry process, Great development potential.

384 contains high nickel and has a low work hardening rate, making it suitable for various occasions with high requirements for cold formability.

1. 384 corresponding grades: 1. National standard GB-T standard: digital grade:

S30608, new grade: 06Cr16Ni18, old grade: 0Cr16Ni18,2, American standard:

ASTMA Standard: S38400, SAE Standard: , UNS Standard:

384,3, Japanese standard JIS standard: SUS384,4, German standard DIN standard: 5, European standard EN standard: , French standard NF standard: , British standard BS standard: , Sweden:

NTR Standards:

2. 384 chemical composition: carbon c: , silicon si:, manganese mn: , phosphorus p: , sulfur s: , chromium cr:, nickel ni:, molybdenum mo:, nitrogen n:—, copper cu:—, other elements:

3. 384 physical properties: density density (20).

kg/dm3:", melting point :1430, specific heat capacity (0 100 ) kg (", thermal conductivity w (

100℃-:"", thermal conductivity w (, coefficient of linear expansion.

10-6/k)

0~100℃:"", linear expansion coefficient (10-6 k).

0~519℃:"-", resistivity (20).

ω.mm2/m):"", longitudinal modulus of elasticity.

20℃）/gpa:"193, Magnetic: None.

4. 384 mechanical properties: Delivery status:"Bar cutting processing solution treatment, hot pressure processing without solution treatment",Solid solution pickling of plates, Tensile Strength(RM MPa):515, Elongation Strength(:205, Elongation A %:40, Section Shrinkage(Z%):

384 Applications: It is suitable for various occasions with high requirements for cold formability.

384 stainless steel.

384 Steel Characteristics and Applications:

384 Steel Chemical Composition:

Carbon C: Manganese Mn:

Silicon SI:

Chromium Cr: Nickel Ni:

Phosphorus p: sulfur s:

Note: Unless otherwise specified, a single value is the highest value. When used in some tube making processes, some types of austenitic stainless steels must have a nickel content slightly higher than the values shown in the table; Random; The highest ta-content is; The maximum content is; The maximum content is;