Casting powder for PSB830 steel cast blank and preparation method of casting powder
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A technology for mold slag and steel casting, which is applied in the field of steelmaking and can solve problems such as surface depressions of casting billets
Inactive Publication Date: 2020-07-10
WUHU XINXING DUCTILE IRON PIPES
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[0003] The purpose of the present invention is to provide a mold powder for PSB830 steel casting slab and its preparation method, whi
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Embodiment 1
[0027] Mix the basic slag, co-solvent and melting rate regulator, melt and cool, dry and grind to obtain mold slag, wherein the mass percentage of each component in the mold slag is: CaO 32.0%, SiO 2 33.0%, Al 2 o 3 4.0%, MgO 5.0%, Na 2 O 6.5%, F 5.0%, Fe 2 o 3 3.0%, C 10.5%, the control alkalinity is 0.95.
Embodiment 2
[0029] Mix the basic slag, co-solvent and melting rate regulator, melt and cool, dry and grind to obtain mold slag, wherein the mass percentage of each component in the mold slag is: CaO 29.2%, SiO 2 33.6%, Al 2 o 33.2%, MgO 4.6%, Na 2 O 7.8%, F 6.2%, Fe 2 o 3 2.2%, C 10.3%, the control alkalinity is 0.87.
Embodiment 3
[0031] Mix the basic slag, co-solvent and melting rate regulator, melt and cool, dry and grind to obtain mold slag, wherein the mass percentage of each component in the mold slag is: CaO 34.4%, SiO 2 33.4%, Al 2 o 3 5.3%, MgO 4.2%, Na 2 O 7.1%, F 4.1%, Fe 2 o 3 2.6%, C 8.1%, the control alkalinity is 1.03.
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Abstract
The invention relates to the field of steelmaking, and discloses casting powder for a PSB830 steel cast blank and a preparation method of the casting powder. The casting powder is prepared from basisslag, a cosolvent and a melting rate modifier, wherein the basis slag is prepared from CaO and SiO2, the cosolvent is prepared from Al2O3, MgO, F and Na2O; and the melting rate modifier is prepared from C. The problem of cast blank surface indentation defects commonly present in current PSB830 finish-rolled threaded steel is solved.
Description
technical field [0001] The invention relates to the field of steelmaking, in particular to a mold slag used for PSB830 steel slab and a preparation method thereof. Background technique [0002] PSB830 steel is a high-strength finish-rolled rebar with high tensile and yield strength. It is widely used in large-scale water conservancy projects, industrial and civil buildings, railways and other fields. It has the advantages of simple connection and anchoring, strong adhesion, and tension It has the advantages of safe and reliable anchorage, convenient construction, etc., and saves steel bars, reduces component area and weight. PSB830 steel is classified as medium carbon steel according to the C element content, but in order to ensure its high strength performance, its silicon content reaches 1.50-1.70%. According to the solidification theory of molten steel, during the casting process of medium carbon steel in the crystallizer, due to its small area shrinkage and thick solidi...
Claims
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