Steel product for flue gas treatment facilities excellent in capability of being cut by gas and/or wear resistance, and flue gas duct
A technology for waste gas treatment equipment and waste gas pipelines, which can be used in waste heat treatment, lighting and heating equipment, furnace components, etc., to solve problems such as difficult acetylene gas cutting, and achieve excellent durability.
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Embodiment 1
[0185] Embodiment 1 is an embodiment related to the inventions of (4) to (7) above.
[0186] The steel with the alloy composition shown in Table 1 was smelted, cast, and hot-rolled to a plate thickness of 12 mm. After heat treatment, the hot-rolled steel plate was used as a raw material.
[0187] Table 1
[0188]
[0189] *Underlined numbers indicate outside the scope of the present invention
[0190] [Waste Test: In-Pipeline Exposure Test]
[0191] A test steel plate (250mm×250mm×12mm) for repair was used. The test steel plate was cold-bent toward the diameter of the inner cylinder. On the inner cylinder of the waste gas pipeline of the electric melting furnace of steel bars, the space for the test steel plate is cut out in advance, and then the test steel plate is welded and installed.
[0192] Welding adopts arc welding with input heat: about 20kJ / cm. As welding material, arc electrode coated with austenitic stainless steel (SUS309L) is used. After 6 months of insta...
Embodiment 2
[0206] Embodiment 2 is an embodiment related to the inventions of the above (1) to (3) and the inventions of the above (8) to (11). In addition, the same applies to the following (Example 3).
[0207] A steel plate (1000 mm x 500 mm x 12 mm) having an alloy composition as shown in Table 4 was divided longitudinally into two parts, joined by butt welding, and then cold-bent in the direction of the inner tube diameter, and then the electric On the inner cylinder of the waste gas pipe of the furnace (position 1) and the water cooling pipe (position 2) of the converter OG waste gas treatment equipment, a window that can be embedded with the test steel plate is cut out in advance, and then the test steel plate is welded and installed.
[0208] In addition, arc welding with heat input of about 20 kJ / cm was used for welding, and arc electrodes coated with austenitic stainless steel (SUS309L) were used as welding materials.
[0209] Preheating and postheating are not required in part...
Embodiment 3
[0219] Steel plates (300mm×300mm×12mm) with the alloy composition shown in Table 6 were butt-welded with a trial-manufactured welding ferritic alloy electrode, and the welding workability and welding crack sensitivity were studied.
[0220] In order to make the composition of Cr-Cu-Ni-Mo-Sb in the weld metal and the chemical composition of the steel plate, which is important for securing the wear resistance, equivalent to the chemical composition of the steel sheet, the electrode was adjusted to the alloy composition shown in Table 7. Welding adopts arc welding with input heat: about 20kJ / cm.
[0221] C
Si
mn
P
S
Cr
Cu
Ni
Mo
W
Sb
Al
N
Ti
other
comparative example
C1
0.05
0.3
0.4
0.01
0.010
3.5
0.50
0.30
0.05
-
0.10
0.025
0.003
-
C2
0.03
0.2
0.4
0.01
0.100
6.5
0.20
0.10
0.10
-
0.11
...
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Abstract
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