High-toughness normalizing steel plate with 460MPa yield strength and manufacturing method thereof

A technology of yield strength and manufacturing method, which is applied in the field of medium-thick steel plate manufacturing, can solve the problems of long process flow, performance fluctuation, high production cost, etc., and achieve the goals of reducing segregation band and band structure, high weldability and eliminating internal stress Effect

Active Publication Date: 2013-09-18
XINYU IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the controlled rolling and controlled cooling process or TMCP + tempering process is used for production, laminar cooling must be carried out after rolling. Due to the influence of factors such as the accuracy of the cooling equipment, the thickness of the steel plate, and the uniformity of the temperature of the steel plate before cooling, the same steel plate often appears The properties of different parts fluctuate greatly; when the quenching + tempering process is used to ensure the hardenability of the steel plate, it is often necessary to add a certain amount of alloying elements such as Cr, Mo, Cu, Nb, Ni, etc., and then through appropriate Tempering treatment to ensure the strength and impact toughness of the steel plate, not only the process is long, but the production cost is also high

Method used

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  • High-toughness normalizing steel plate with 460MPa yield strength and manufacturing method thereof
  • High-toughness normalizing steel plate with 460MPa yield strength and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The normalized weldable fine-grained high-strength and tough steel plate with a yield strength of 460 MPa in this example is composed of the following components by weight percentage: C: 0.14%, Si: 0.60%, Mn: 1.20%, V: 0.12%, Ni : 0.15%, N: 0.005%, Alt: 0.015%, P: 0.010%, S: 0.005%, the rest is iron Fe and unavoidable impurities, and the grain size is 11.5. The thickness of the steel plate is 6mm;

[0024] The controlled rolling and normalizing process of the present embodiment are as follows:

[0025] (1) Heating system: heat the billet to 1240°C, and the total heating time is controlled at 1.2 minutes / mm;

[0026] (2) Rolling process: Two-stage rolling is adopted, that is, rolling in the recrystallization zone and rolling in the non-recrystallization zone. The thickness of the intermediate billet to be warmed is 12 times the thickness of the finished product, and the rolling start temperature in the non-recrystallization zone is 920°C. The final rolling temperature ...

Embodiment 2

[0030] The normalized weldable fine-grained high-strength and tough steel plate with a yield strength of 460 MPa in this embodiment is composed of the following components by weight percentage: C: 0.15%, Si: 0.50%, Mn: 1.40%, V: 0.16%, Ni : 0.25%, N: 0.020%, Alt: 0.040%, P: 0.015%, S: 0.004%, the rest is iron Fe and unavoidable impurities, and the grain size is 11.0. The thickness of the steel plate is 25mm;

[0031] The controlled rolling and normalizing process of the present embodiment are as follows:

[0032] (1) Heating system: heat the billet to 1240°C, and the total heating time is controlled at 1.0 min / mm;

[0033] (2) Rolling process: Two-stage rolling is adopted, that is, rolling in the recrystallization zone and rolling in the non-recrystallization zone. The rolling temperature is 840°C;

[0034] (3) Cooling process after rolling: air cooling after rolling;

[0035] (4) Normalizing process: the rolled steel plate is subjected to normalizing treatment, the normal...

Embodiment 3

[0037] The normalized weldable fine-grained high-strength and tough steel plate with a yield strength of 460 MPa in this embodiment is composed of the following components by weight percentage: C: 0.17%, Si: 0.35%, Mn: 1.67%, V: 0.17%, Ni : 0.30%, N: 0.015%, Alt: 0.020%, P: 0.007%, S: 0.004%, the rest is iron Fe and unavoidable impurities, and the grain size is 10 grades. The thickness of the steel plate is 44mm;

[0038] The controlled rolling and normalizing process of the present embodiment are as follows:

[0039](1) Heating system: heat the billet to 1230°C, and the total heating time is controlled at 1.1 minutes / mm;

[0040] (2) Rolling process: Two-stage rolling is adopted, that is, rolling in the recrystallization zone and rolling in the non-recrystallization zone. The rolling temperature is 815°C;

[0041] (3) Cooling process after rolling: air cooling is adopted after rolling;

[0042] (4) Normalizing process: the rolled steel plate is subjected to normalizing tr...

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Abstract

The invention relates to the technical field of manufacture of medium steel plates, and discloses a high-toughness normalizing steel plate with 460MPa yield strength and a manufacturing method thereof. The high-toughness normalizing steel plate comprises the following chemical components by weight percent: 0.14%-0.20% of C, 0.20%-0.60% of Si, 1.20%-1.70% of Mn, 0.12%-0.20% of V, 0.15%-0.40% of Ni, 0.005%-0.020% of N, 0.005%-0.040% of Alt, less than or equal to 0.015% of P, less than or equal to 0.005% of S, and the balance of Fe and inevitable impurity. The manufacturing method disclosed by the invention comprises the steps of: heating a continuous casting blank to be at 1210-1240 DEG C by using a controlled rolling process and a normalizing process; controlling the total heating time according to 1.0-1.2min / mm; adopting a two-stage rolling mode, and controlling the initial rolling temperature of a non-recrystallization zone to be at 850-920 DEG C, and controlling the finishing temperature to be at 780-840 DEG C; carrying out air cooling after rolling; and controlling the normalizing temperature of the steel plate to be at 880-920 DEG C, and controlling the heat preservation time for 15-40 minutes. According to the high-toughness steel plate manufactured by using the method, the quality is stable, the performance is good and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of manufacturing medium-thick steel plates, in particular to a normalizing weldable high-strength and tough steel plate with a yield strength of 460 MPa and a manufacturing method thereof. Background technique [0002] With the development of society, various industries have put forward higher requirements for the steel plates used by themselves. In order to reduce the self-weight of the equipment, the steel plates are required to have higher strength; in order to improve the safety of equipment, the steel plates are required to have a low yield ratio; To expand the use environment and application fields of equipment, steel plates are required to have good low-temperature toughness; in order to facilitate the manufacturing and processing of equipment, steel plates are also required to have certain weldability, so the demand for high-strength and tough steel plates is increasing. At present, high-strength and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21D1/28C21D8/02C21D11/00
Inventor 刘小林王洪夏文勇程小三赵和明付清霞董富筠赵敏森罗仁辉王鹏
Owner XINYU IRON & STEEL CO LTD
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