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The stainless steel plate has a smooth surface, high plasticity, toughness and mechanical strength, and is resistant to corrosion by acids, alkaline gases, solutions and other media. It is an alloy steel that is not easy to rust, but it is not absolutely rust-free. Stainless steel plate refers to steel plate resistant to corrosion by weak media such as atmosphere, steam and water, while acid-resistant steel plate refers to steel plate resistant to corrosion by chemical corrosive media such as acid, alkali and salt.
Performance:
Corrosion resistance
The stainless steel plate has the ability to resist general
corrosion similar to the unstable nickel-chromium alloy 304.
Long-term heating in the temperature range of chromium carbide may
affect alloys 321 and 347 in harsh corrosive media. Mainly used in
high temperature applications, high temperature applications
require materials to have strong sensitization resistance to
prevent intergranular corrosion at lower temperatures.
High temperature oxidation resistance
Stainless steel plates have high temperature oxidation resistance,
but the oxidation rate will be affected by inherent factors such as
exposure environment and product form.
Physical properties
The total heat transfer coefficient of a metal depends on other
factors besides the thermal conductivity of the metal. In most
cases, the film heat dissipation coefficient, scale and metal
surface condition. Stainless steel can keep the surface clean, so
its heat transfer is better than other metals with higher thermal
conductivity. Liaocheng Suntory Stainless Steel provides technical
standards for stainless steel plates: high-strength stainless steel
plates with excellent corrosion resistance, bending workability,
toughness of welded parts, and excellent stamping workability of
welded parts and manufacturing methods thereof. Specifically, it
contains C: 0.02% or less, N: 0.02% or less, Cr: 11% or more and
less than 17%, appropriate content of Si, Mn, P, S, Al, Ni, and
satisfies 12≤Cr Mo 1.5Si≤ 17. The stainless steel plate with 1≤Ni
30(CN) 0.5(Mn Cu)≤4, Cr 0.5(Ni Cu) 3.3Mo≥16.0, 0.006≤CN≤0.030 is
heated to 850~1250℃, and then heated at 1℃/s The above cooling rate
cooling heat treatment. In this way, it can become a high-strength
stainless steel plate with a martensite content of more than 12% by
volume, high strength of more than 730MPa, corrosion resistance and
bending performance, and excellent toughness of the welded
heat-affected zone. Reuse of Mo, B, etc., can significantly improve
the stamping performance of welded parts.
The flame of oxygen and gas cannot cut stainless steel plate
because stainless steel is not easy to be oxidized.
Corrosion conditions
1. The surface of stainless steel has accumulated dust containing
other metal elements or attachments of foreign metal particles. In
humid air, the condensed water between the attachments and
stainless steel connects the two to form a micro battery, which
initiates an electrochemical reaction , The protective film is
damaged, which is called electrochemical corrosion.
2. The surface of stainless steel adheres to the organic juice
(such as melon, vegetable, noodle soup, sputum, etc.), which forms
organic acid in the presence of water and oxygen, and the organic
acid will corrode the metal surface for a long time.
3. The surface of stainless steel adheres to containing acid,
alkali, and salt substances (such as alkaline water and lime water
splashing on the decoration wall), causing local corrosion.
4. In polluted air (such as the atmosphere containing a large
amount of sulfide, carbon oxide, and nitrogen oxide), in contact
with condensed water, sulfuric acid, nitric acid, and acetic acid
liquid spots are formed, causing chemical corrosion. The above
conditions can cause damage to the protective film on the stainless
steel surface Damage causes rust.
Preservative
The corrosion resistance of stainless steel plate mainly depends on
its alloy composition (chromium, nickel, titanium, silicon,
aluminum, manganese, etc.) and internal structure. The main role is
chromium. Chromium has high chemical stability, can form a
passivation film on the surface of steel, isolate the metal from
the outside world, protect the steel plate from oxidation, and
increase the corrosion resistance of the steel plate. After the
passivation film is destroyed, the corrosion resistance decreases.