635MPa-grade high-strength anti-seismic steel bar and preparation method thereof

An earthquake-resistant steel bar and high-strength technology, which is applied in the field of hot-rolled ribbed steel bars for reinforced concrete structures, can solve the problems of high price of chromium-nickel-molybdenum alloy structural steel, failure to consider the application of earthquake-resistant structures, and unfavorable mass promotion and application. Stable performance and good comprehensive mechanical properties

Pending Publication Date: 2020-11-17
安徽吾兴新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it has the following disadvantages: (1) Cr-Ni-Mo alloy structural steel is expensive, which is not conducive to mass promotion and application; (2) The application of earthquake-resistant structures is not considered

Method used

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  • 635MPa-grade high-strength anti-seismic steel bar and preparation method thereof
  • 635MPa-grade high-strength anti-seismic steel bar and preparation method thereof
  • 635MPa-grade high-strength anti-seismic steel bar and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment provides a 635MPa grade high-strength anti-seismic steel bar and a preparation method thereof, comprising the following steps:

[0036] The chemical composition of steel is by weight: 0.24% C, 0.70% Si, 1.50% Mn, 0.020% P, 0.013% S, 0.160% V, 0.010% Nb, and the rest are Fe and unavoidable impurity elements;

[0037] Converter process: the end point is 0.018%P, 0.011%S, the tapping temperature is 1660°C, and the alloy is added to the ladle during the tapping process;

[0038] LF furnace process: white slag refining to remove P and S, weakly blowing argon for 15 minutes before leaving the station, and the temperature at the station is 1550°C;

[0039] Continuous casting process: full protection pouring, tundish temperature 1520°C, straightening temperature 950°C, working casting speed 2.8m / min;

[0040] Steel rolling process: Heating temperature 1130°C, final rolling temperature 1050°C, rough rolling, intermediate rolling, and final rolling to produce Φ12...

Embodiment 2

[0044] This embodiment provides a 635MPa grade high-strength anti-seismic steel bar and a preparation method thereof, comprising the following steps:

[0045] The chemical composition of steel is by weight: 0.29% C, 0.80% Si, 1.60% Mn, 0.024% P, 0.013% S, 0.100% V, 0.030% Nb, and the rest are Fe and unavoidable impurity elements;

[0046] Converter process: the end point is 0.020%P, 0.012%S, the tapping temperature is 1710°C, and the alloy is added to the ladle during the tapping process;

[0047] LF furnace process: white slag refining to remove P and S, weak argon blowing for 10 minutes before exiting the station, and the exiting temperature is 1620°C;

[0048] Continuous casting process: full protection pouring, tundish temperature 1560°C, straightening temperature 1000°C, working casting speed 2.0m / min;

[0049] Steel rolling process: heating temperature 1170°C, final rolling temperature 1100°C, rough rolling, intermediate rolling, and final rolling to produce Φ16mm steel...

Embodiment 3

[0051] This embodiment provides a 635MPa grade high-strength anti-seismic steel bar and a preparation method thereof, comprising the following steps:

[0052] The chemical composition of steel is by weight: 0.26% C, 0.72% Si, 1.52% Mn, 0.022% P, 0.015% S, 0.140% V, 0.015% Nb, and the rest are Fe and unavoidable impurity elements;

[0053] Converter process: the end point is 0.019%P, 0.013%S, the tapping temperature is 1670°C, and the alloy is added to the ladle during the tapping process;

[0054] LF furnace process: making white slag, refining and removing P and S, weakly blowing argon for 14 minutes before leaving the station, and leaving the station at a temperature of 1560°C;

[0055] Continuous casting process: full protection pouring, tundish temperature 1530°C, straightening temperature 960°C, working casting speed 2.6m / min;

[0056] Steel rolling process: Heating temperature 1140°C, final rolling temperature 1060°C, rough rolling, intermediate rolling, and final rolli...

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Abstract

The invention belongs to the technical field of hot-rolled ribbed steel bars for reinforced concrete structures, and particularly relates to a 635MPa-grade high-strength anti-seismic steel bar and a preparation method thereof. Steel in a steel bar comprises the following chemical components in percentage by weight: 0.24-0.29 percent of C, 0.70-0.80 percent of Si, 1.50-1.60 percent of Mn, less thanor equal to 0.035 percent of P, less than or equal to 0.035 percent of S, 0.100-0.160 percent of V, 0.010-0.030 percent of Nb and the balance of Fe and inevitable impurity elements. The 635MPa-gradehigh-strength anti-seismic steel bar with high strength and high plasticity is produced by adopting a high-C, Si and Mn component design and a V and Nb combined microalloying manner under the condition of existing process equipment of a production plant and combining steelmaking and steel rolling processes, is stable in performance and good in comprehensive mechanical property, and has yield strength greater than or equal to 635MPa, tensile strength greater than or equal to 795MPa, percentage elongation after fracture greater than or equal to 15%, total elongation under maximal force greater than or equal to 9.0%, the strength-to-yield ratio greater than or equal to 1.25 and the yield-to-yield ratiogreater than or equal to 1.30, good anti-seismic performance is achieved, and the requirements of high-rise and large-span anti-seismic structures are met.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled ribbed steel bars for reinforced concrete structures, and in particular relates to a 635MPa high-strength anti-seismic steel bar and a preparation method thereof. Background technique [0002] Hot-rolled ribbed steel bars are widely used in various reinforced concrete structures, and play an important role in ensuring the service life and safety of reinforced concrete buildings. With the continuous emergence of high-rise and long-span buildings in my country, the demand for high-strength steel bars, especially 635MPa steel bars, has increased. Using 635MPa grade steel bars instead of 400MPa grade and brand HRB400 steel bars can save about 35% or more of material. Most provinces and cities in my country are located in the earthquake zone. With the frequent occurrence of earthquakes in recent years, the demand for earthquake-resistant steel bars continues to increase. Therefore, the use of 635M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C33/04
CPCC22C33/04C22C38/002C22C38/02C22C38/04C22C38/12
Inventor 魏滔锴黄华
Owner 安徽吾兴新材料有限公司
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