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Stainless Steel Sheet Corrosion Resistance Depends Primarily On Its Alloy Composition And Internal Organizational Structure

Stainless steel plate: Two types of hot and cold rolled, including thicknesses of 0.5-4 mm and 4.5-35 mm thick plates. According to the organizational characteristics of steel is divided into five categories: austenitic, austenitic - ferrite, ferrite, martensitic, precipitation hardening type. 

It is resistant to various acids such as oxalic acid, sulfuric acid-ferric sulfate, nitric acid, nitric acid-hydrofluoric acid, sulfuric acid-copper sulfate, phosphoric acid, formic acid and acetic acid. It is widely used in chemical, food, medicine, paper, oil and so on. Industrial, as well as construction, kitchen utensils, tableware, vehicles, household appliances various types of components. In order to ensure the yield strength, tensile strength, elongation and hardness of all kinds of stainless steel plate to meet the requirements, steel plate before delivery must be annealed, solution treatment, aging treatment and other heat treatment.

The corrosion resistance of stainless steel depends mainly on its alloy composition (chromium, nickel, titanium, silicon, aluminum, etc.) and the internal structure, the main role is the chromium element. Chromium has a high chemical stability, can form a passive film on the steel surface, so that the metal and the outside isolation, to protect the steel plate is not oxidized, increase the corrosion resistance of steel plate. After the passivation film is damaged, the corrosion resistance decreases.

Analysis of Performance Characteristics of Stainless Steel Plate

1, corrosion resistance

The stainless steel plate has a similar ability to resist general corrosion as the unstable nickel-chromium alloy 304. Long-term heating in the temperature range of the degree of chromium carbide may affect the alloy 321 and 347 in harsh corrosive media. Mainly used for high temperature applications, high temperature applications require strong resistance to the material to prevent corrosion at lower temperatures.

2, high temperature oxidation resistance

Stainless steel plates have high temperature oxidation resistance, but the oxidation rate will be exposed to the environment and product factors such as the inherent factors.

3, physical performance

The total heat transfer coefficient of the metal depends on the thermal conductivity of the metal, but also on other factors. In most cases, the film heatsink, the scale and the surface condition of the metal. Stainless steel can keep the surface clean, so its heat transfer is better than other metal with higher thermal conductivity.

Stainless steel plate corrosion resistance, bending processing performance and welding part toughness, as well as the welding parts of the stamping processing performance of high strength stainless steel plate and its manufacturing method. Specifically, Si, Mn, P, S, Al, and Ni containing C: 0.02% or less, N: 0.02% or less, Cr: 11% or more and less than 17%, and satisfying 12? Cr Mo 1.5Si? Stainless steel plate heated to 850 to 1250 ° C, and then subjected to heating at a temperature of 1 ° C / s (manufactured by Nippon & lt; RTI ID = 0.0 & gt; The above cooling rate is cooled by heat treatment. This can be a high strength stainless steel plate with a structure with a volume fraction of 12% or more, a high strength, corrosion resistance and bending workability of 730 MPa or more, and excellent toughness of the weld heat affected zone. And then use Mo, B, etc., can significantly improve the welding parts of the stamping process performance.