500MPa hot-rolled refractory steel bar and manufacturing method thereof

A manufacturing method and steel bar technology, which is applied in the field of building steel bar materials, can solve problems such as lack, and achieve the effects of low manufacturing cost, reasonable component design, and avoiding abnormal organization

Active Publication Date: 2020-03-27
YANGCHUN NEW STEEL CO LTD +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, many fire-resistant steels are developed for the purpose of producing building steel structures, but the technology for producing steel bars with certain fire-resistant properties is still relatively lacking. At the same time, most of the domestic buildings still use the traditional combination of reinforced concrete for reinforcement. , which requires us to develop a new generation of steel bars with fire resistance on the basis of traditional building steel bars

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  • 500MPa hot-rolled refractory steel bar and manufacturing method thereof
  • 500MPa hot-rolled refractory steel bar and manufacturing method thereof
  • 500MPa hot-rolled refractory steel bar and manufacturing method thereof

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Embodiment Construction

[0065] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0066] 1. A 500MPa hot-rolled refractory steel bar, characterized in that its composition includes: C: 0.16% to 0.22%, Si: 0.40% to 0.55%, Mn: 1.10% to 1.30%, P≤0.025%, S≤0.015 %, Cr ≤ 0.3%, Nb ≤ 0.035%, Ni ≤ 0.1%, V ≤ 0.045%, Ti ≤ 0.08% and Mo: 0.25% ~ 0.45%, the balance is Fe and unavoidable residual elements; its mechanical properties at room temperature yield The strength is 520-590MPa, the tensile strength is 685-935Mpa, the elongation after fracture is ≥20%, and the total elongation of the maximum force is ≥10%; its structure is ferrite F, pearlite P and bainite B, and its crystal The particle size is 8.5-10.5; its mechanical properties at 600°C yield strength is 350-450MPa, tensile strength is 455-550Mpa, and elongation af...

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Abstract

The invention discloses a 500MPa hot-rolled refractory steel bar, of which the room-temperature mechanical property yield strength is 520-590 MPa, the tensile strength is 685-935 MPa, the percentage elongation after fracture is larger than or equal to 20%, and the maximum total elongation is larger than or equal to 10%. The 500MPa hot-rolled refractory steel bar comprises ferrite F, pearlite P andbainite B; the grain size is 8.5-10.5 grade; the mechanical property yield strength at 600 DEG C is 350-450 MPa; the tensile strength is 455-550 MPa; and the percentage elongation after fracture is larger than or equal to 20%. The invention further discloses a manufacturing method of the 500MPa hot-rolled refractory steel bar. The 500MPa hot-rolled refractory steel bar is reasonable in componentdesign; the requirements for room temperature and high temperature performance are considered; the quality of the refractory steel bar is improved; and application of the 500MPa hot-rolled refractorysteel bar is better popularized and promoted.

Description

technical field [0001] The invention relates to a building steel bar material, in particular to a 500MPa hot-rolled fire-resistant steel bar and a manufacturing method thereof. Background technique [0002] With the development of super high-rise buildings in our country, the fire prevention problem of buildings has become an important issue directly related to personal and property safety. Foreign high-rise and super high-rise buildings are dominated by pure steel structures, while in my country, steel-concrete hybrid structures are mostly used. The reason why the steel-concrete hybrid structure has been greatly developed is that it can effectively combine steel and concrete components, which not only has the technical advantages of steel structures but also has the characteristics of relatively low cost of concrete. The annual output of steel bars in my country is more than 200 million tons, but the development of fire-resistant steel bars is blank in China. In order to s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C38/48C22C38/46C22C38/44C22C38/04C22C38/02C22C33/06C21C5/28C21C7/06C21C7/072B22D11/16C21D8/08
CPCB22D11/16C21C5/28C21C7/0056C21C7/06C21C7/072C21D8/065C21D8/08C22C33/06C22C38/002C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50Y02P10/20
Inventor 樊尧桂傅余东郝飞翔聂志斌李卫东刘富贵邓冰
Owner YANGCHUN NEW STEEL CO LTD
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