A kind of 1420mpa class pc steel bar special parent metal wire rod and its preparation method

A technology of wire rod and base metal, which is applied in the field of steel rolling, can solve the problems of reduced production efficiency, residual stress of quenching cracking, and unreasonable composition design, etc., and achieve the effects of optimizing design, eliminating residual stress, and shortening induction heating time

Active Publication Date: 2021-07-23
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, some components are unreasonably designed. When downstream users make PC steel rods, the induction heating time is longer and the process of rapid quenching and low temperature tempering is required to meet the strength requirements of PC steel rods, which often leads to a decrease in the production efficiency of users. , quenching cracking or insufficient residual stress relief, hysteresis fracture, etc.

Method used

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  • A kind of 1420mpa class pc steel bar special parent metal wire rod and its preparation method
  • A kind of 1420mpa class pc steel bar special parent metal wire rod and its preparation method
  • A kind of 1420mpa class pc steel bar special parent metal wire rod and its preparation method

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preparation example Construction

[0023] The preparation method of the special base metal wire rod for 1420MPa grade PC steel bars according to the present invention comprises the steps of heating, rough intermediate rolling and pre-finishing, pre-controlled cooling, finishing rolling, controlled cooling, spinning and slow cooling, and specifically includes the following steps:

[0024] A. Heating: The steel billet is sent to the heating furnace and heated to 1040-1070°C. The steel billet includes the following chemical components in terms of mass percentage: C: 0.27%-0.32%, Si: 0.80%-1.00%, Mn: 1.0% ~1.20%, Ti: 0.010~0.017%, P≤0.025%, S≤0.025%, Mo≤0.010%, N:≤0.0060%; and Si+Mn≤2.0%, Si:N≥160; the rest are Fe and inevitable impurities;

[0025] B. Roughing and intermediate rolling and pre-finishing rolling: the heated billet is rolled for 18 passes, the rolling temperature is 1040~1070℃, and the total rolling reduction rate is 98.0%~98.6%;

[0026] C. Pre-cooling: The rolling stock after the pre-finishing rol...

Embodiment 1

[0037] The 150mm×150mm cold billet is sent to the heating furnace for heating. The billet contains the following chemical components by mass percentage: C: 0.30%, Si: 0.80%, Mn: 1.18%, Ti: 0.010%, P: 0.013%, S: 0.019%, Mo: 0.008%, N: 0.0045%, Si+Mn=21.98%, Si: N=177; the rest are Fe and unavoidable impurities; the billet stays in the soaking section for 30min, and it is After 60 minutes, the steel billet after being released from the furnace is subjected to eighteen passes of finishing rolling and pre-finishing rolling, the total reduction rate is 98.6%, and the rolling temperature is 1040 ° C, to obtain the pre-finishing rolling stock. The rolled piece after pre-finishing is cooled by water in 2 stages, with a total water volume of 216m 3 / h, the specific water volume is 1.0:1.0, and back-purging is performed after water cooling between sections to obtain a 940°C finishing rolling stock. The 940 ℃ advanced finishing rolling stock is then subjected to 6 passes of finishing ro...

Embodiment 2

[0040] The 150mm×150mm cold billet is sent to the heating furnace for heating. The chemical composition of the billet is calculated as: C: 0.27%, Si: 0.99%, Mn: 1.01%, Ti: 0.015%, P: 0.016% , S: 0.020%, Mo: 0.005%, N: 0.0060%, Si+Mn=2.0%, Si: N=165; the rest are Fe and inevitable impurities. The billet stayed in the soaking section for 35 minutes, and the total time in the furnace was 80 minutes. The billet after being released from the furnace was subjected to eighteen passes of finishing rolling and pre-finishing rolling, the total reduction rate was 98.0%, and the rolling temperature was 1070 ℃. Rolled stock. The rolled piece after pre-finishing is cooled by water in 2 stages, with a total water volume of 216m 3 / h, the specific water volume is 1:1, and back-purging is performed after water cooling between sections to obtain a 970°C finishing rolling stock. The 970 ℃ advanced finishing rolling stock is then subjected to 6 passes of finishing rolling in the finishing rolli...

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Abstract

The invention discloses a base metal wire rod for 1420MPa grade PC steel rods and a preparation method thereof. The base metal wire rod includes the following chemical components in terms of mass percentage: C: 0.27%-0.32%, Si: 0.80%-1.00 %, Mn:1.0%~1.20%, Ti:0.010~0.017%, P≤0.025%, S≤0.025%, Mo≤0.010%, N:≤0.0060%, and Si+Mn≤2.0%, Si:N≥ 160, the rest is Fe and unavoidable impurities, and its preparation method includes heating, rough rolling and pre-finish rolling, pre-controlled cooling, finish rolling, controlled cooling, spinning and slow cooling processes. The invention adopts the optimized design of the steel composition and the coupled control of the steel rolling process to appropriately increase the starting rolling temperature, the finishing rolling temperature and the spinning temperature of the steel, and adopts slow cooling after rolling to reduce the special base metal wire rod for PC steel bars after rolling. The residual stress and the number of oversaturated N and C interstitial atoms shorten the natural aging time and improve the comprehensive performance of aging, meet the requirements of downstream users when making PC steel rods, and prevent drawing fracture, quenching crack, hysteresis fracture and heading cracking, etc. quality accident.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a special base metal wire rod for 1420MPa grade PC steel bars and a preparation method thereof. Background technique [0002] PC steel rods (steel rods for prestressed concrete) have the advantages of high strength and toughness, low relaxation, and material saving, and are widely used in prestressed components such as pipe piles, viaduct piers, railway sleepers, and electric poles. With the rapid development of highways, bridges and high-rise and super high-rise buildings in China, the domestic market demand for PC steel bars has grown rapidly, and the demand for special base metal wire rods for 1420MPa grade PC steel bars is relatively large. However, the special base metal wire rod for 1420MPa grade PC steel rod is a high-strength alloy steel. In order to ensure the strength, low-temperature rolling and rapid cooling are generally used for production. Becaus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C21D8/08
CPCC21D8/065C21D8/08C21D2211/005C22C38/001C22C38/002C22C38/02C22C38/04C22C38/12C22C38/14
Inventor 张红斌陈伟张卫强李晓云王卫东张森赵亮王文峰马松文玉兵苏灿东
Owner WUKUN STEEL
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