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30MnSiBCa hot-rolled wire rod for PC steel bar and preparation method of 30MnSiBCa hot-rolled wire rod

A technology of hot-rolled wire rods and steel rods, applied in the field of 30MnSiBCa hot-rolled wire rods for PC steel rods and its preparation, can solve the problems of high cost, large fluctuations in raw material performance, frequent adjustment of PC steel rod production processes, etc., and achieve production Reduce cost, improve hardenability and elastic straightening performance, and avoid the effect of heading cracking

Active Publication Date: 2019-12-03
YANGCHUN NEW STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies in the prior art, one of the purposes of the present invention is to provide a 30MnSiBCa hot-rolled wire rod for PC steel rods and a preparation method thereof, in order to solve the large fluctuations in the performance of raw materials for existing PC steel rods, resulting in the subsequent PC Due to the frequent adjustment of the steel bar production process and the high cost, at the same time, by rationally optimizing the components in the PC steel bar and screening the appropriate heat treatment process, a PC steel bar with excellent performance is prepared. The excellent performance mainly refers to the general The properties of the bar are uniform, the surface quality is good, the mechanical strength is high, there is no delayed fracture phenomenon, and the upsetting and weldability are good.

Method used

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  • 30MnSiBCa hot-rolled wire rod for PC steel bar and preparation method of 30MnSiBCa hot-rolled wire rod
  • 30MnSiBCa hot-rolled wire rod for PC steel bar and preparation method of 30MnSiBCa hot-rolled wire rod
  • 30MnSiBCa hot-rolled wire rod for PC steel bar and preparation method of 30MnSiBCa hot-rolled wire rod

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Experimental program
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Effect test

Embodiment 1

[0050] The present embodiment provides a kind of 30MnSiBCa hot-rolled wire rod for PC steel bar, and its composition weight percent is:

[0051] C 0.29%, Si 0.78%, Mn 1.05%, P 0.011%, S 0.004%, B 0.0023%, Ca 0.0018%, Cr 0.12%, Ni 0.038%, Cu 0.052%, O 0.0008%, N<0.0008% , the rest is Fe and unavoidable impurities,

[0052] The present embodiment also provides a method for preparing the above-mentioned 30MnSiBCa hot-rolled wire rod for PC steel bars, which specifically includes the following steps:

[0053] Step 1. Smelting molten steel: Add 100t of molten iron with S≤0.025%, P≤0.120% and 24t of scrap steel as raw materials into the converter, adopt the top-bottom composite blowing process, add lime with a CaO content of 90% and an activity of 300ml and use high Stretching and blowing far carbon, control the carbon content of the end point to 0.12%, and the tapping temperature to 1600°C;

[0054] Argon is blown throughout the tapping process, and the argon flow rate is 25NL / mi...

Embodiment 2

[0060] The present embodiment provides a kind of 30MnSiBCa hot-rolled wire rod for PC steel bar, and its composition weight percent is:

[0061] C 0.29%, Si 0.81%, Mn 1.06%, P 0.014%, S 0.006%, B 0.0028%, Ca 0.0018%, Cr 0.14%, Ni 0.028%, Cu 0.036%, O 0.0006%, N<0.0009% , the rest is Fe and unavoidable impurities,

[0062] Specifically include the following steps:

[0063] Step 1. Smelting molten steel: Add 100t of molten iron with S≤0.025% and P≤0.120% and 24t of scrap steel as raw materials into the electric furnace, adopt the top-bottom compound blowing process, add lime with a CaO content of 90% and an activity of 300ml and use high Stretching and blowing far carbon, control the carbon content of the end point to 0.12%, and the tapping temperature to 1600°C;

[0064] Argon is blown throughout the tapping process, and the argon flow rate is 24NL / min. High-aluminum-manganese-ferroalloy is added at the beginning of tapping, and silicon-manganese alloy and silicon-ferroalloy ...

Embodiment 3

[0070] The present embodiment provides a kind of 30MnSiBCa hot-rolled wire rod for PC steel bar, and its composition weight percent is:

[0071] C 0.31%, Si 0.79%, Mn 1.16%, P 0.011%, S 0.008%, B 0.0035%, Ca 0.0022%, Cr 0.12%, Ni 0.048%, Cu 0.066%, O 0.0007%, N<0.0007% , the rest is Fe and unavoidable impurities,

[0072] Specifically include the following steps:

[0073] Step 1. Smelting molten steel: Add 110t of molten iron with S≤0.025% and P≤0.120% and 14t of scrap steel as raw materials into the electric furnace, adopt the top-bottom composite blowing process, add lime with a CaO content of 90% and an activity of 300ml and use high Stretching and blowing far carbon, the carbon content at the end point is controlled to 0.13%, and the tapping temperature is 1620°C;

[0074] Argon is blown throughout the tapping process, and the flow rate of argon is 20NL / min. High-aluminum-manganese-ferroalloy is added at the beginning of tapping, and silicon-manganese alloy and silicon-f...

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Abstract

The invention relates to a 30MnSiBCa hot-rolled wire rod for a PC steel bar and a preparation method of the 30MnSiBCa hot-rolled wire rod; B and Ca elements are added into the 30MnSiBCa hot-rolled wire rod, and the hardenability and delayed fracture resistance of the wire rod are improved by controlling the ratio of B to Cr, Mn and Si and the content of Ca and B; meanwhile, an existing preparationprocess of the hot-rolled wire rod is optimized, molten steel is smelted by a converter / electric furnace; lF refining is carried out, and the 30MnSiBCa hot-rolled wire rod is prepared through the process route of continuous casting of steel billets and hot rolling and controlled cooling, so that the same batch of head and tail and different batches of hot-rolled wire rods are stable in performance and small in component fluctuation, the purity of steel is greatly improved, and the technical effects of avoiding frequent adjustment of the subsequent PC steel bar production process and being high in cost are achieved.

Description

technical field [0001] The invention relates to the technical field of steel preparation, in particular to a 30MnSiBCa hot-rolled wire rod for PC steel bars and a preparation method thereof. Background technique [0002] Pipe piles have the characteristics of high construction efficiency, low cost, and good safety. Since the 1990s, they have replaced traditional building foundation construction methods. , High-rise buildings and other projects can be widely used. The high-strength prestressed steel bar (also known as PC steel bar) as the skeleton of the pipe pile needs to have excellent properties such as high strength, low relaxation, and good plasticity. Made by heating, quenching, tempering and other processes. [0003] At present, the grades of domestic PC steel bars mainly include 30MnSi and 45Si2Cr. Among them, GB / T24587-2009 "Hot Rolled Wire Rod for Prestressed Concrete Steel Bars" stipulates that the chemical composition of 30MnSi includes C0.28-0.33%, Si0.7 -1.1%...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/32C22C38/20C22C38/54C22C38/42C22C33/06C21D8/06
CPCC21D8/065C21D2211/005C21D2211/009C22C33/06C22C38/02C22C38/04C22C38/20C22C38/32C22C38/42C22C38/54Y02P10/20
Inventor 傅余东左都伟樊尧桂周和敏郝飞翔聂志斌刘富贵张俊徐洪军沈朋飞
Owner YANGCHUN NEW STEEL CO LTD
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