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Reasons for the defects of 09CuPCrNi-A weathering steel

Reasons for the defects of 09CuPCrNi-A weathering steel

09CUPCRNI-A weathering steel is designed to meet the requirements of high speed, heavy load and light weight of railway. Based on the composition of 09CUPCRNI-A weathering steel, Nb microalloying technology has been used to successfully develop high strength and high weather resistance hot rolling of Q345 grade. H-beam.
However, since 09CUPCRNI-A weathering steel is mostly in the sub-peritectic reaction zone and contains Nb and higher P, the high temperature plasticity is poor and the surface crack sensitivity is strong. At the same time, the steel grade contains elements such as chromium, copper and nickel. The shell is easy to adhere to the mold copper plate, so that the joint leakage occurs. In order to reduce the bond leakage rate, the low-speed process is adopted in the continuous casting of the blank, which results in a high incidence of the joint defect.
 TB/T 1979 09CuPCrNi-A Chemical Composition(%):


Grade

Chemical Composition(%)

C Max

Si 

Mn 

S Max 

China TB/T 1979 09CuPCrNi-A

0.12

0.25-0.75

0.20-0.50

0.06-0.12

0.02

Grade

Mechanical Property

 

Yield Strength(MPa) min

Tensile Strength(MPa) min

% Elongation min

China TB/T 1979 09CuPCrNi-A

348

480

24

Type of 09CuPCrNi-A weathering steel defect:


 (1) One type is visible to the naked eye. The regularity of its distribution is not very strong, and it is everywhere in the width direction of the web. The opening degree is above 0.5 mm, the length is longer than 200 mm, and the longer is more than 1 m. If the surface longitudinal crack is not particularly deep, the effect of such defects can be greatly reduced by surface flame cleaning.

(2) The other type is a small surface longitudinal crack with a length of about 50 mm, but the depth can reach more than 1 mm. This kind of defect is difficult to find without pickling, so it can't be eliminated by flame cleaning. This kind of defect has a great influence on the surface quality of H-beam after rolling..

09CuPCrNi-A weathering steel is our main advantage product.we export large quantity 09CuPCrNi-A weathering steel to other counties every year.09CuPCrNi-A weathering ‘s quantity can be guaranteed by katalor with rich experience and more than 18 years history. Welcome inquiry of 09CuPCrNi-A weathering steel from you.

 

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