hrb500e niobium-titanium micro-alloy high-strength anti-seismic steel bar and its production process

A technology of anti-seismic steel bars and production technology, which is applied in the field of metallurgy to achieve the effects of reducing crack sensitivity, increasing safety reserves, and reducing construction costs

Active Publication Date: 2021-08-10
苏州东大汉森冶金实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still necessary to formulate and modify supporting products and design standards

Method used

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  • hrb500e niobium-titanium micro-alloy high-strength anti-seismic steel bar and its production process
  • hrb500e niobium-titanium micro-alloy high-strength anti-seismic steel bar and its production process
  • hrb500e niobium-titanium micro-alloy high-strength anti-seismic steel bar and its production process

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Experimental program
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Effect test

Embodiment 1

[0035] The production process of the HRB500E niobium-titanium microalloy high-strength seismic steel bar of the present invention comprises the following steps:

[0036] Step 1, converter smelting process:

[0037] Add molten iron and scrap steel in a ratio of 9:1, the total amount of molten iron and scrap steel is 80t; blowing for 10min, heating rate is 36℃ / min, control end temperature is 1660℃, 22kg ferrosilicon and 7.4kg silicon are added during the tapping process Manganese alloy and 0.4kg ferroniobium were deoxidized and alloyed, 340L / min air volume was bottom-blown for 3 minutes, then adjusted to 34L / min small air volume, temperature was measured and sampled, 0.82kg ferro-titanium was added after the composition was qualified, and air volume was bottom-blown 40s, stir to make it melt quickly, then adjust to 20L / min small air volume for soft blowing for 6min, the temperature after the furnace is 1568℃, turn off the argon gas, and send it to continuous casting and pouring;...

Embodiment 2

[0045] The production process of the HRB500E niobium-titanium microalloy high-strength seismic steel bar of the present invention comprises the following steps:

[0046] Step 1, converter smelting process:

[0047] Add molten iron and scrap steel in a ratio of 9:1, the total amount of molten iron and scrap steel is 80t, blowing for 12min, the heating rate is 31℃ / min, the control end temperature is 1670℃, and 23kg ferrosilicon and 7.6kg silicon are added during the tapping process. Manganese alloy and 0.5kg ferroniobium were deoxidized and alloyed, 360L / min air volume was blown at the bottom for 4 minutes, then a small air volume of 37L / min was adjusted, temperature was measured and sampled, 0.85kg ferrotitanium was added after the composition was qualified, and the air volume was blown at the bottom for 45s , stir to make it melt quickly, then adjust to a small gas volume of 18L / min for soft blowing for 7min, the temperature after the furnace is 1575℃, turn off the argon gas, ...

Embodiment 3

[0054] The HRB500E niobium-titanium microalloy high-strength earthquake-resistant steel bar production process of the present invention comprises the following steps:

[0055] Step 1, converter smelting process:

[0056] Add molten iron and scrap steel in a ratio of 9:1, the total amount of molten iron and scrap steel is 80t, blow for 10min, the heating rate is 37℃ / min, the control end temperature is 1668℃, and 24kg ferrosilicon and 7.8kg silicon are added during the tapping process. Manganese alloy and 0.6kg ferroniobium were deoxidized and alloyed, 370L / min air volume was blown at the bottom for 5 minutes, then a small air volume of 35L / min was adjusted, temperature measurement and sampling, after the composition was qualified, 0.9kg ferrotitanium was added, and the air volume was blown at the bottom for 50s , stir to make it melt quickly, then adjust to a small gas volume of 20L / min and soft blow for 7min. After the furnace, the temperature is 1570℃, turn off the argon gas,...

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Abstract

A HRB500E niobium-titanium micro-alloy high-strength anti-seismic steel bar and its production process belong to the field of metallurgy technology. The chemical composition and weight percentage of the steel bar are as follows: C: 0.20-0.25%, Ti: 0.005-0.03%, Nb: 0.01-0.04%, Si: 0.60-0.80%, Mn: 1.40-1.60%, P≤0.045%, S≤0.045%, the rest is Fe and unavoidable impurities; preparation method: 1) converter smelting process: adding ferrosilicon and silicon during tapping Manganese and niobium-iron alloys are deoxidized and alloyed, ferro-titanium is added, and sent to continuous casting by soft blowing; 2) Continuous casting process: continuous casting is used for full protection casting; 3) Heating and rolling process: pre-watering process is used, shear Inspection and storage after cutting; the specifications of the steel bar are that the yield strength of the steel bar of the present invention is ≥ 500MPa, the tensile strength is ≥ 630MPa, the strength-to-yield ratio is ≥ 1.25, the yield-to-standard ratio is ≤ 1.30, the elongation after breaking is ≥ 15, and the maximum elongation Rate Agt ≥ 9.0%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and specifically relates to HRB500E niobium-titanium microalloy high-strength earthquake-resistant steel bars and a production process. Background technique [0002] With the rapid development of my country's economy, the amount of small-sized steel bars in high-rise building projects and reinforced concrete structures of major projects is increasing, and the requirements for the performance of steel bars are getting higher and higher. and other issues have become the focus of attention. At present, most countries in the world have eliminated ribbed steel bars with a strength level of 355MPa, and low-strength steel bars have significant disadvantages in terms of building safety, yield ratio, yield strength, welding strength and steel utilization rate. The safety of construction projects brings many hidden dangers, and the waste of steel is serious. The United States and European Union countri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/12C22C38/04C22C38/02C22C33/06C21C7/06B22D11/16C21D8/08
CPCB22D11/16C21C7/06C21D8/065C21D8/08C22C33/06C22C38/002C22C38/02C22C38/04C22C38/12C22C38/14Y02P10/20
Inventor 窦为学杨振海田鹏
Owner 苏州东大汉森冶金实业有限公司
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