High-strength easy-to-weld steel plate for super-thick large-scale hydropower station and production method thereof

A hydropower station, high-strength technology, applied in the direction of furnace type, furnace, heat treatment equipment, etc., can solve the problems of high production cost, low reference degree, high carbon equivalent, etc., and achieve low production cost, low welding crack sensitivity, good low temperature The effect of toughness

Active Publication Date: 2021-11-30
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Weakness one is that alloy content is high in the chemical composition of the present invention, and carbon equivalent is higher, and production cost is high
Second, on-line quenching is required, which requires high cooling equipment and poor performance stability
The disadvantage is that the invention has high alloy content in the chemical composition of the present invention, high carbon equivalent, and high production cost
The disadvantage is that the invention is only for 80mm thick steel plate, the chemical composition and carbon equivalent are high, the performance data of the steel plate is not comprehensive, and the reference degree is small

Method used

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  • High-strength easy-to-weld steel plate for super-thick large-scale hydropower station and production method thereof
  • High-strength easy-to-weld steel plate for super-thick large-scale hydropower station and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The raw material molten iron undergoes deep desulfurization of molten iron, top-bottom blowing of converter, argon blowing of ladle, external refining of LF furnace, RH vacuum treatment and continuous casting process to obtain 250mm thick slab with chemical composition weight percentage shown in Table 1. The slab heating temperature is 1226°C, the heating time is 265min, the rolling start temperature of the first stage is 1186°C, and the relative reduction ratio of a single pass is controlled at least 15% for at least two passes. When the thickness of the rolled piece is 129mm, After the temperature reaches 883°C, the second-stage rolling is carried out, the final rolling temperature is 848°C, and the thickness of the finished steel plate is 86mm. After rolling, the steel plate enters the accelerated cooling (ACC) device and is cooled to 662°C at a rate of 8°C / s. After hot straightening, the cooling bed is cooled. Afterwards, online flaw detection and finishing treatmen...

Embodiment 2

[0032] The implementation is the same as in Example 1, wherein the heating temperature is 1224°C, the heating time is 262min, the rolling start temperature of the first stage rolling is 1163°C, the starting rolling temperature of the second stage rolling is 886°C, and the thickness of the rolled piece is 135mm. The final rolling temperature is 856°C, and the thickness of the finished steel plate is 90mm. The cooling rate of the steel plate is 8°C / s, and the final cooling temperature is 653°C. After hot straightening, the cooling bed is cooled. Then carry out flaw detection and finishing treatment. After the steel plate is shot blasted, it is quenched. The quenching heating temperature is 920°C, the holding time is 20 minutes, the tempering temperature of the steel plate is 620°C, and the holding time is 40 minutes. The steel plate is available.

Embodiment 3

[0034] The implementation is the same as in Example 1, wherein the heating temperature is 1224°C, the heating time is 273min, the rolling start temperature of the first stage rolling is 1175°C, the starting rolling temperature of the second stage rolling is 886°C, and the thickness of the rolled piece is 140mm. The final rolling temperature is 850°C, and the thickness of the finished steel plate is 100mm. The cooling rate of the steel plate is 8°C / s, and the final cooling temperature is 642°C. After hot straightening, the cooling bed is cooled. Then carry out flaw detection and finishing treatment. After the steel plate is shot blasted, it is quenched. The quenching heating temperature is 920°C, the holding time is 20 minutes, the tempering temperature of the steel plate is 620°C, and the holding time is 40 minutes. The steel plate is available.

[0035] Table 1 Chemical composition (wt %) of embodiment 1~3 of the present invention

[0036] implement C Si mn ...

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Abstract

The invention discloses a high-strength and easy-to-weld steel plate for super-thick large-scale hydropower stations. 0.004%, Cr: 0.10-0.18%, Ni: 0.20-0.28%, Mo: 0.15-0.20%, Nb: 0.045-0.055%, V: 0.03-0.04%, Ti: 0.008-0.015%, B: 0.0007-0.0015 %, Ceq≤0.40%, Pcm≤0.20%. A method for its production is also disclosed. The steel plate of the invention has a tensile strength greater than 610MPa, has good low-temperature toughness, low carbon equivalent and welding crack sensitivity, and low production cost, is suitable for large-scale production and has stable performance.

Description

technical field [0001] The invention relates to a steel plate for hydropower, in particular to a high-strength easy-to-weld steel plate for a super-thick large-scale hydropower station and a production method thereof. Background technique [0002] High-strength ultra-thick steel plates for large-scale hydropower stations generally refer to steel plates with a thickness greater than 80mm. They are mainly used to manufacture the first-level ribs of hydropower stations. They are key parts and have strict requirements on the performance of steel plates. Generally, the total compression ratio is required to be greater than 3 in the plastic deformation forming process of extra-thick steel plates. If the compression ratio is small, the internal segregation and loose defects of the finished steel plate will not be completely eliminated when the general production method is used, and the tensile strength is difficult to guarantee. Above 610MPa, it is a very difficult product to produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21D1/25C21D6/00C21D8/02C21D9/00C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
CPCC21D1/25C21D6/004C21D6/005C21D6/008C21D8/0221C21D9/0081C22C33/06C22C38/002C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 杨雄高军卢晓禹王少炳杨维宇勤牧
Owner BAOTOU IRON & STEEL GRP
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