hot-rolled steel surface roughness

by:ChangZeng     2020-05-27
The release truck frame assembly of String bars and reinforcement bars, beams and plates and the material part of the bracket use 355L heat
Steel, use hot rolling according to structural strength requirements
355L thick about 3 ~ Rolling Steel 8mm.
The release truck frame assembly of String bars and reinforcement bars, beams and plates and the material part of the bracket use 355L heat
Steel, use hot rolling according to structural strength requirements
355L thick about 3 ~ Rolling Steel 8mm. Hot-
Rolling seamless steel pipes during rolling, because the surface is composed of iron oxide, iron oxide and iron oxide to form a high temperature black oxide, therefore, it is usually called black steelrolled steel. Hot-
The oxide film on the surface of the steel is very thin, combined with the dense body, and does not fall off.
Commonly used methods of chemical rust remover and mechanical rust remover, the past large iron parts are more of a method of using chemical rust remover --
Pickling rust, due to the large environmental pollution, acid rust has been gradually eliminated. Instead, it is a mechanical scale removal method, which uses mechanical scale removal and throwing pills.
High blasting-
The high-speed rotation of the impeller throws the steel ball to the surface of the steel, so as to achieve the purpose of rust. it is a more advanced mechanical treatment of the steel to rust, with high efficiency and low cost, high degree of automation, can realize the characteristic of pipeline operation and environmental pollution, widely used in steel and automobile manufacturing.
After the hot rolled steel plate is shot by shot blasting, the surface roughness has a significant effect on the corrosion resistance of the cathode-plated coating.
It is found that with the increase of thermal surface roughness,
Rolled steel plate, can reduce the corrosion resistance of the coating. When the hot-
3 medium rolled steel plate. 4 ~ 4.
4 μm Ra or below roughness, coating corrosion resistance and cold
Corrosion coating of steel; when hot-
The roughness Ra of rolled steel plate is 7. 0 ~ 9.
0 μm, coating corrosion layer coating of hot rolled steel plate without shot blasting treatment has considerable corrosion resistance;
The roughness Ra of steel plate during hot rolling is 9. 0 to when 12.
0 μm, the corrosion resistance of the coating is seriously reduced.
Adjusting the diameter of the point with blasting (
From the original Phi 10 ~ 1. 2mm down to Φ0. 5 ~ 0. 8mm)
, Ensure that the quality of the coating obtained by cathode deposition of the workpiece meets the CA/C202 A standard.
For lower coating standards that require special workpieces, you can decide whether to adopt a sandblasting process depending on the oxidation state of the surface of the skin.
If the oxide surface is not damaged, the blasting process can be canceled;
The liberation of the truck frame assembly currently exists in the case of string bars and reinforcement bars, beams and nets, and the oxide of some supports being destroyed, and the blasting process must be used before painting.
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