Method for producing niobium-contained HRB400 grade reinforcing steel

A technology of high-grade steel bars and steel bars, applied in the field of low-alloy steel production, can solve problems such as no successful experience, achieve good weldability, obvious yield point, and solve the effects of inconspicuous yield point

Inactive Publication Date: 2007-08-01
广州工业投资控股集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The use of niobium microalloying technology to produce carbon equivalent Ceq≤0.45% and diameter Φ40mm niobium-containing HRB400 steel bars has no successful experience in China.

Method used

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  • Method for producing niobium-contained HRB400 grade reinforcing steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The technological process adopted is: electric furnace smelting, refining, billet continuous casting, casting billet enters the heating furnace after solidification and cooling, hot rolling, air cooling, fixed length and bundle.

[0033] The chemical composition of molten steel includes: C: 0.19%, Si: 0.48%, Mn: 1.14%, Nb: 0.036%, S: 0.030%, P: 0.030%, Ceq: 0.409.%;

[0034] Billet continuous casting process parameters: billet continuous casting straightening temperature is not lower than 950 ~ 1000 ℃;

[0035] Continuous rolling process parameters: slab heating temperature 1100-1250°C, soaking temperature 1150-1230°C, rolling start temperature 1050-1100°C, free air cooling mode.

[0036] The properties and grain size of the steel are shown in the table below, and the structure is shown in Figure 1.

[0037] diameter

Embodiment 2

[0039] The technological process adopted is: electric furnace smelting, refining, billet continuous casting, casting billet enters the heating furnace after solidification and cooling, hot rolling, air cooling, fixed length and bundle.

[0040] The chemical composition of molten steel includes: C: 0.21%, Si: 0.48%, Mn: 1.16%, Nb: 0.036%, S: 0.030%, P: 0.025%, Ceq: 0.428%;

[0041] Billet continuous casting process parameters: billet continuous casting straightening temperature is not lower than 950 ~ 1000 ℃;

[0042] Continuous rolling process parameters: slab heating temperature 1100-1250°C, soaking temperature 1150-1230°C, rolling start temperature 1050-1100°C, free air cooling mode.

[0043]The properties and grain size of the steel are shown in the table below, and the structure is shown in Figure 2.

[0044] diameter

Embodiment 3

[0046] The technological process adopted is: electric furnace smelting, refining, billet continuous casting, casting billet enters the heating furnace after solidification and cooling, hot rolling, air cooling, fixed length and bundle.

[0047] The chemical composition of molten steel includes: C: 0.18%, Si: 0.49%, Mn; 1.07%, Nb: 0.033%, S: 0.024%, P: 0.015%, Ceq: 0.388%, V: 0.019%;

[0048] Billet continuous casting process parameters: billet continuous casting straightening temperature is not lower than 950 ~ 1000 ℃;

[0049] Continuous rolling process parameters: slab heating temperature 1100-1250°C, soaking temperature 1150-1230°C, rolling start temperature 1050-1100°C, free air cooling mode.

[0050] The properties and grain size of the steel are shown in the table below, and the structure is shown in Figure 3.

[0051] diameter

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Abstract

A method of produce containing niobium HRB400 reinforcement which process flow includes: electric furnace smelting, refining, billet casting, casting blank solidification and cooling, putting it into heating-furnace, hot-rolling, air cooling, sizing and hoping. The characteristics are: control the chemical composition range of molten steel (weight%): Ceq <= 0.45%, C: 0.18 ~ 0.24%, Si: 0.40 ~ 0.65%, Mn: 1.00~ 1.50%, Nb: 0.03 ~ 0.045% , S: <= 0.045%, P: <= 0.045%, V: 0 ~ 0.035%; little billet casting tandem rolling art parameters: casting blank continuous casting aligning temperature >=950DEG C, casting blank heating temperature is 1100 ~ 1250 degree C, soakage temperatures is 1150 ~ 1230 degree C, cut temperature is 1050~1100 DEG C, free air-cooling mode. The method can be used to produce Nb microalloy and Nb,V composite microalloying HRB400 reinforcement which Ceq(carbon equivalent) <=0.45wt.%, and has high intensity, seismic behavior and weldability in the electric furnace- continuous casting-tandem rolling process.

Description

technical field [0001] The invention relates to the technical field of low-alloy steel production, in particular to a method for producing niobium-containing HRB400 grade ribbed steel bars. Background technique [0002] HRB400 grade ribbed steel bar is a high-strength construction steel grade in the Chinese GB1499 standard, and it is an important material in the concrete structure of engineering buildings. In industrialized countries such as Europe and the United States, the amount of steel bars above HRB400 has accounted for more than 70% of construction steel. The steel bars used in building concrete in my country have always been dominated by HRB335 steel bars. Due to the low strength of HRB335 steel bars, in order to ensure the strength of the building structure, the arrangement density of steel bars has to be increased, thereby increasing the amount of steel used and causing greater waste, while HRB400 steel bars have high strength, stable performance, It has the adva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/46B21B1/16B21B37/74C22C38/60C22C38/12
Inventor 叶志平李学勤侯大华郭楚雄黄振晖李烈军关学方郭云峰范卫忠周广武李国宏王纪东岳志毅朱伯平罗小平
Owner 广州工业投资控股集团有限公司
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