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Anti-seismic, weather-proof and high-strength YS700MPa hot-rolled reinforced bar

A high-strength, steel-reinforced technology, applied in the field of new steel materials, can solve the problem of failure to reach the strength-to-yield ratio of steel bars in seismic-resistant building structures, and achieve the effects of preventing oxidation and corrosion, improving weather resistance, and good seismic performance.

Inactive Publication Date: 2012-11-28
CENT IRON & STEEL RES INST +1
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  • Application Information

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Problems solved by technology

However, the total elongation of G100 grade steel bars only reaches 7.2-10%, and the strength-to-yield ratio TS / YS is only 1.05-1.18, which does not meet the technical index requirement of earthquake-resistant building structures for the strength-to-yield ratio of steel bars: TS / YS≥1.25

Method used

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  • Anti-seismic, weather-proof and high-strength YS700MPa hot-rolled reinforced bar
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  • Anti-seismic, weather-proof and high-strength YS700MPa hot-rolled reinforced bar

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Embodiment Construction

[0094] 1 Semi-industrial trial production

[0095] The semi-industrial trial production of high-strength HRB700SW grade hot-rolled steel bars was carried out in a high-frequency vacuum furnace and a hot continuous rolling mill (28 stands). The test results show that the controlled rolling and controlled cooling of low-nickel-chromium steel can not only make hot-rolled steel bars meet the requirements of yield strength YS700MPa, but also have a very low yield ratio (YS / TS=0.61-0.63 or very high The strength-to-yield ratio TS / YS=1.560-1.64) and good seismic performance are significantly better than the performance index requirements of Japanese and Chinese standards for seismic steel bars, and the yield ratio YS / TS≤0.80 or the strength-to-yield ratio TS / YS≥1.25 .

[0096] Table 5 Chemical composition of HRB700SW grade hot-rolled steel bar in semi-industrial test (nickel-chromium content is the middle limit of the composition)

[0097]

[0098] Table 6 Mechanical properties ...

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Abstract

The invention provides an anti-seismic, weather-proof and high-strength YS700MPa hot-rolled reinforced bar, which belongs to the technical field of steel and iron raw materials. A low nickel-chromium content (Ni (Nickel) (2.0%), Cr (Chromium) (2.0%)) and vanadium-nitrogen micro-alloying combined component design is adopted; and the hot-rolled reinforced bar comprises the following components in percentage by mass: 0.20-0.25% of C (Carbon), 0.40-0.80% of Si (Silicon), 1.20-1.60% of Mn (Manganese), no more than 0.035% of P (Phosphorus), no more than 0.035% of S (Sulfur), 0.06-0.20% of V (Vanadium), 0.010-0.030% of N (Nitrogen), 0.20-2.0% of Ni (Nickel), 0.20-2.0% of Cr (Chromium), 0.01-0.03% of Ti (Titanium) and the balance of Fe (Ferrum). The anti-seismic, weather-proof and high-strength YS700MPa hot-rolled reinforced bar provided by the invention has the advantages as follows: under a condition that yield strength of the reinforced bar reaches YS700 MPa in a hot rolled state, the total elongation rate of the reinforced bar after being broken reaches 12.5-18.0%, the uniform elongation rate of the reinforced bar after being broken reaches 5.5-9.5%, the tensile-to-yielding ratio of the reinforced bar after being broken reaches 1.27-1.45, and technical index requirements on anti-seismic performance are satisfied; moreover, the weather resistance of the reinforced bar is superior to that of world-class brand weathering resistant steel Corten A.

Description

technical field [0001] The invention belongs to the technical field of new iron and steel materials, and in particular provides an anti-seismic and weather-resistant high-strength YS700MPa grade hot-rolled steel bar. Background technique [0002] At present, there is no steel enterprise in the world that can produce this kind of high-strength YS700MPa grade hot-rolled ribbed steel bar with both earthquake resistance and weather resistance. MMFX Company of the United States is the only manufacturer in the world that has developed G100 grade (YS100ksi grade, ie YS690MPa grade) hot-rolled steel bars with good weather resistance. The company adopts a very high Cr content (8-10.9%Cr) close to ferritic stainless steel, so that the G100 steel bar not only achieves a high yield strength above 690MPa, but also ensures that the G100 steel bar has very good atmospheric corrosion resistance. This is true for various bridge and road structures (such as reinforced concrete decks, road pa...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50
Inventor 李光瀛刘宪民张江玲张黎明王卫卫杨俊虎
Owner CENT IRON & STEEL RES INST
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