HRB500E Nb-Ti microalloy high-strength aseismic reinforcement bar and production process

A technology of anti-seismic steel bar and production process, which is applied in the field of metallurgy to achieve the effects of reducing crack sensitivity, reducing billet defects, and reducing the density of reinforcing bars

Active Publication Date: 2019-10-01
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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However, it is still necessary to formulate and modify supporting products and design standards

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  • HRB500E Nb-Ti microalloy high-strength aseismic reinforcement bar and production process
  • HRB500E Nb-Ti microalloy high-strength aseismic reinforcement bar and production process
  • HRB500E Nb-Ti microalloy high-strength aseismic reinforcement bar and production process

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Embodiment 1

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

[0036] Step 1, converter smelting process:

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

[00...

Embodiment 2

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

[0046] Step 1, converter smelting process:

[0047] Add molten iron and scrap steel at a ratio of 9:1, the total amount of molten iron and scrap steel is 80t, blow for 12min, the heating rate is 31°C / min, the control end temperature is 1670°C, add 23kg of ferrosilicon and 7.6kg of silicon during tapping Manganese alloy and 0.5kg ferro-niobium are deoxidized and alloyed, 360L / min air volume is blown at the bottom for 4 minutes, then the air volume is adjusted to 37L / min, temperature is measured and sampled, after the composition is qualified, 0.85kg of titanium iron is added, and air volume is blown at the bottom for 45s , Stir to make it melt quickly, then adjust to a small gas volume of 18L / min and blow softly for 7 minutes. After the furnace temperature is 1575°C, turn off the argon gas and send it to continuo...

Embodiment 3

[0054] The HRB500E niobium-titanium microalloy high-strength anti-seismic 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 at a ratio of 9:1, the total amount of molten iron and scrap steel is 80t, blow for 10min, the heating rate is 37°C / min, the control end temperature is 1668°C, add 24kg of ferrosilicon and 7.8kg of silicon during tapping Manganese alloy and 0.6kg ferro-niobium are deoxidized and alloyed, 370L / min air volume is blown at the bottom for 5 minutes, then the air volume is adjusted to 35L / min, temperature is measured and sampled, after the composition is qualified, 0.9kg of titanium iron is added, and air volume is blown at the bottom for 50s , stir to make it melt quickly, then adjust to a small gas volume of 20L / min and softly blow air for 7 minutes, after the furnace temperature is 1570°C, turn off the argon gas and send it to continuous c...

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Abstract

The invention provides an HRB500E Nb-Ti microalloy high-strength aseismic reinforcement bar and a production process and belongs to the technical field of metallurgy. Chemical components of the reinforcement bar comprise, by weight, 0.20-0.25% of C, 0.005-0.03% of Ti, 0.01-0.04% of Nb, 0.60-0.80% of Si, 1.40-1.60% of Mn, less than or equal to 0.045% of P, less than or equal to 0.045% of S, and thebalance Fe and inevitable impurities. A preparation method comprises the steps of (1) converter smelting, specifically, adding ferrosilicon, silicomanganese and ferrocolumbium alloys in the steel tapping process, conducting deoxidation alloying, adding ferrotitanium and conducting soft blowing to feed the mixture to be subjected to continuous casting and pouring; (2) continuous casting, specifically, conducting protective casting in the whole continuous casting process; and (3) heating and rolling, specifically, conducting shearing through the water pre-cooling process and then conducting check and warehousing, wherein according to the specifications of the reinforcement bar, the yield strength of the reinforcement bar is greater than or equal to 500 MPa, the tensile strength is greater than or equal to 630 MPa, the yield strength ratio is greater than or equal to 1.25, the yield standard ratio is less than or equal to 1.30, the percentage elongation after fracture is greater than orequal to 15, and the maximum elongation Agt is greater than or equal to 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 anti-seismic steel bars and a production process. Background technique [0002] With the rapid development of my country's economy, more and more small-scale steel bars are used in high-rise building projects and reinforced concrete structures in major projects, and the requirements for steel bar performance are getting higher and higher. The safety, earthquake resistance, and weldability of building structures 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 355 MPa. Low-strength steel bars have significant disadvantages in terms of construction safety, strength-to-yield ratio, yield strength, welding strength, and steel bar utilization. The safety of construction projects brings many hidden dangers, and the waste ...

Claims

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Application Information

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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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