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430 stainless steel is a ferritic stainless steel, which is a kind of chromium stainless steel. It contains more than 17% chromium and a small amount of nickel, but no other alloying elements are added. 430 stainless steel has good corrosion resistance and thermal oxidation resistance, and is suitable for general indoor applications, such as kitchen equipment, food processing equipment, and various home appliances. However, compared with other types of stainless steel, 430 stainless steel has poor corrosion resistance in strong acid and alkali environments.

Chemical composition of 430 stainless steel

material

430

chemical composition

C

Mn

Si

P

S

Cr

Fe

0-0.08

0-1.00

0-1.00

0-0.04

0-0.02

16-18

Balance

Mechanical properties of 430 stainless steel

material

430

mechanical properties

Tensile Strength (MPa)

Proof Stress 0.2% (MPa)

Elongation (%)

450 – 600 MPa

260 Min MPa

20 Min %

Physical properties of 430 stainless steel

material

430

physical properties

Density

Melting Point

Modulus of Elasticity

Electrical Resistivity

Thermal Conductivity

Thermal Expansion

7.75 g/cm3

1425-1510°C

200 GPa

0.60 x 10-6 Ω.m

23.9 W/m.K at 100°C

10.4 x 10-6/K at 100°C

Corrosion resistance of 430 stainless steel

Stainless steel 430 has good corrosion resistance to a variety of media, including nitric acid and some organic acids. The corrosion resistance of Style 430 is best when it has a highly polished surface. Like other ferritic grades, it is very resistant to stress corrosion cracking, especially in dry environments. The following are the characteristics of corrosion resistance of 430 stainless steel:

Anti-atmospheric corrosion: 430 stainless steel has good resistance to the corrosion of oxygen, humid air and many chemical substances in the atmosphere.

Water corrosion resistance: 430 stainless steel has good corrosion resistance in tap water, steam and many fresh water environments.

Not suitable for strong acid and alkali media: 430 stainless steel has poor corrosion resistance to strong acid and alkali media such as concentrated sulfuric acid, hydrochloric acid, nitric acid, alkali and salt solutions, so it is not suitable for use in the environment of these media.

Good wear performance: Due to the high hardness of 430 stainless steel, it has good wear resistance and is suitable for some working conditions that require wear resistance.

Heat resistance of 430 stainless steel

430 stainless steel is a low-alloy ferritic stainless steel with good corrosion resistance and mechanical properties, but its heat resistance is relatively poor. The following are some characteristics about the heat resistance of 430 stainless steel:

Deformation at high temperature: 430 stainless steel is prone to deformation under high temperature conditions. Its heat treatment hardening performance is poor, so it is prone to plastic deformation under high temperature stress.

Oxidation: The oxidation temperature of 430 stainless steel is low, and it has good oxidation resistance in intermittent operation at 870°C and continuous operation at 815°C. When exposed to air at high temperature for a long time, a thicker oxide layer will be formed, affecting the performance of the material.

Coefficient of thermal expansion: 430 stainless steel has a higher coefficient of thermal expansion than other materials and is prone to dimensional changes when temperature rises, potentially causing misfit or cracking of components.

Maintenance of 430 stainless steel

All stainless steel fabrication should only be done with tools designed for stainless steel materials. Tools and work surfaces must be thoroughly cleaned before use. These precautions are necessary to avoid cross-contamination of stainless steel with easily corroded metals that may discolor the finish of the finished product.

Processing of 430 stainless steel

  1. Cold working: The ductility of 430 stainless steel is worse than that of 304 stainless steel, but the degree of work hardening of 430 stainless steel is better than that of 304 stainless steel, and 430 stainless steel is easy to cold work.
  2. Thermal processing: Manufacturing methods such as forging should be carried out after uniform heating to 816-1038°C. The assembly should then be air cooled to room temperature and annealed. Grain growth occurs due to prolonged exposure to forming temperatures. This should be avoided as excessive grain growth can lead to an “orange peel” texture on the surface of the material. Since Grade 430 is typically used in aesthetic applications, surface finish is extremely important.

Heat Treatment of 430 Stainless Steel

430 stainless steel cannot be hardened by heat treatment. The annealing of 430 stainless steel is to heat the steel plate to 815 degrees Celsius, soak for 30 minutes per 25mm thickness, cool to 600 degrees Celsius in the furnace, and then rapidly cool. This plate becomes brittle if cooled slowly from 540-400°C.

Machinability of 430 stainless steel

430 stainless steel is a general purpose ferritic stainless steel with good machinability. The following are the machining performance characteristics of 430 stainless steel:

Cutting performance: 430 stainless steel has low hardness and is easy to cut and process. Conventional cutting tools such as knives, drills, etc. can effectively process 430 stainless steel.

Bending performance: Due to its high ductility and plasticity, 430 stainless steel shows good performance in cold bending and hot bending. Under appropriate equipment and process conditions, it can be bent into the desired shape.

Welding performance: 430 stainless steel can be joined by common welding methods (such as arc welding, argon arc welding). However, due to its low thermal conductivity, the rate of heating and cooling during soldering needs to be controlled to avoid stress and deformation.

Work hardening: During machining, 430 stainless steel may undergo work hardening. This means that the material becomes harder during machining, leading to machining difficulties and increased tool wear. Proper annealing treatment can reduce work hardening phenomenon.

Welding of 430 stainless steel

430 stainless steel can be welded by all fusion methods. It is best to preheat to 150-200 degrees Celsius, and then anneal at 790-815 degrees Celsius to reduce embrittlement in the heat-affected zone.

Application fields of 430 stainless steel

Stainless Steel 430 is a ferritic stainless steel with good corrosion resistance and mechanical properties. The following are some application areas of 430 stainless steel:

Construction engineering: 430 stainless steel is often used in interior decoration, doors and windows, railings, guardrails and other architectural structures. Due to its good corrosion resistance, it can be used in humid, high temperature, high humidity and other environments.

Kitchen utensils: 430 stainless steel is often used to make kitchen utensils, such as cooking utensils, sinks, stoves, etc. It has excellent corrosion resistance and high temperature resistance, and is easy to clean and maintain.

Automobile industry: 430 stainless steel is widely used in automobile exhaust system, exterior decoration and parts. Its high temperature tolerance and corrosion resistance make it an ideal material of choice.

Food processing industry: Because 430 stainless steel has high hygienic requirements for food and does not cause any chemical reaction to food, it is often used in food processing equipment and container manufacturing.

Chemical industry: 430 stainless steel is often used to make storage tanks, pipelines and chemical equipment because it can resist the erosion of corrosive media.

Household appliances: 430 stainless steel is widely used in household products, such as furniture accessories, hardware, kitchen and bathroom supplies, etc.