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An ultra-thick, high-strength, lamellar tear-resistant q500d-z35 steel plate for hydropower units and its manufacturing method

A Q500D-Z35 anti-lamellar tearing technology, which is applied in the field of metallurgy, can solve the problems of low CEV of steel plates, high welding performance requirements, and difficulty in increasing the performance of steel plates, so as to improve welding performance, improve comprehensive performance of steel plates, and solve quenching problems. The effect of permeability

Active Publication Date: 2017-08-22
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] ⑺. The requirements for welding performance are high, and the CEV of the steel plate is required to be very low. The CEV of the steel plate with a thickness ≥ 240mm shall not be greater than 0.62%. The contradiction between composition and performance is very prominent, which greatly increases the difficulty of ensuring the performance of the steel plate;

Method used

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  • An ultra-thick, high-strength, lamellar tear-resistant q500d-z35 steel plate for hydropower units and its manufacturing method
  • An ultra-thick, high-strength, lamellar tear-resistant q500d-z35 steel plate for hydropower units and its manufacturing method
  • An ultra-thick, high-strength, lamellar tear-resistant q500d-z35 steel plate for hydropower units and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] The grade of steel in this embodiment is Q500D-Z35, the thickness of the steel plate is 265mm, and the single weight of the steel plate is 45t. It is smelted from the following components in mass percentage, C: 0.14%, Si: 0.35%, Mn: 0.98%, P: 0.008%, S: 0.001%, Ni: 1.02%, Cr: 0.62%, Mo: 0.50%, Cu: 0.28%, Nb: 0.029%, Al: 0.030%, Ti: 0.022%, V: 0.002%, Ca: 0.0015%, B: 0.0003%, and the balance is Fe and unavoidable impurities.

[0097] The steps of the Q500D-Z35 steel plate production method of the present embodiment are ultra-thick, high-strength, and resistant to lamellar tearing are as follows:

[0098] Step (1) Determine the size of the steel ingot and the forging billet. The steel ingot is a quincunx ingot, the nominal weight of the steel ingot is 70t, the thickness of the steel billet after forging is 880mm, the width is 2100mm, and the length is 3900mm.

[0099] Step (2) initial smelting, the primary smelting is carried out in the EAF electric arc furnace, and the ...

Embodiment 2

[0121] The grade of steel in this embodiment is Q500D-Z35, the thickness of the steel plate is 325mm, and the single weight of the steel plate is 34t. It is smelted from the following components in mass percentage, C: 0.15%, Si: 0.45%, Mn: 0.90%, P: 0.006%, S: 0.001%, Ni: 1.22%, Cr: 0.59%, Mo: 0.55%, Cu: 0.26%, Nb: 0.032%, Al: 0.029%, Ti: 0.020%, V: 0.002%, Ca: 0.0020%, B: 0.0003%, and the balance is Fe and unavoidable impurities.

[0122] The steps of the Q500D-Z35 steel plate production method of the present embodiment are ultra-thick, high-strength, and resistant to lamellar tearing are as follows:

[0123] Step (1) Determine the size of the steel ingot and the forging billet. The steel ingot is a quincunx ingot, the nominal weight of the steel ingot is 60t, and the thickness of the steel billet after forging is 1020mm, the width is 1600mm, and the length is 3900mm.

[0124] Step (2) preliminary refining, the preliminary refining is carried out in the EAF electric arc furn...

Embodiment 3

[0146] The grade of steel in this embodiment is Q500D-Z35, the thickness of the steel plate is 210mm, and the single weight of the steel plate is 29t. It is smelted from the following components in mass percentage, C: 0.12%, Si: 0.29%, Mn: 1.02%, P: 0.006%, S: 0.001%, Ni: 0.90%, Cr: 0.67%, Mo: 0.45%, Cu: 0.20%, Nb: 0.025%, Al: 0.029%, Ti: 0.022%, V: 0.002%, Ca: 0.0010%, B: 0.0002%, and the balance is Fe and unavoidable impurities.

[0147] The steps of the Q500D-Z35 steel plate production method of the present embodiment are ultra-thick, high-strength, and resistant to lamellar tearing are as follows:

[0148] Step (1) Determine the size of the steel ingot and the forging billet. The steel ingot is a quincunx ingot, the nominal weight of the steel ingot is 50t, the thickness of the steel billet after forging is 810mm, the width is 2100mm, and the length is 3900mm.

[0149] Step (2) initial refining, the initial refining is carried out in the EAF electric arc furnace, and the ...

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Abstract

The invention relates to a super-thick high-strength lamellar-tearing-resistant Q500D-Z35 steel plate and meanwhile further relates to a manufacturing method of the steel plate. The steel plate meets the quality requirements of steel plates for manufacturing a large or a super-large hydropower station generator set. An appropriate amount of carbon and alloy elements are compounded; the problems of the quenching degree and hardenability of a steel plate are solved; reasonable quenching equipment and a reasonable hardening and tempering technological system are combined; the microstructure of the steel plate can achieve reasonable compounding of granular bainite, polygonal ferrite and tempered sorbite of proper morphology; and it is guaranteed that base metal of the steel plate and performance achieved after welding stress-elimination treatment can meet the using requirements. Through appropriate ingot type selection and the strict and reasonable steel-making technology, steel ingot casting technology, steel ingot forging technology and steel plate rolling technology, it is guaranteed that the required thickness and piece weight requirements for the steel plate are met; and under the conditions of high thickness and high piece weight, the excellent macrostructure is achieved, and thus the core quality and lamellar-tearing resistance of the steel plate and uniformity of the whole plate are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an ultra-thick, high-strength, layered tear-resistant Q500D-Z35 steel plate for manufacturing large-scale and super-large hydroelectric generator sets, and a manufacturing method of the steel plate. Background technique [0002] With the deepening of China's energy structure adjustment, hydropower has been regarded as the mainstream trend of domestic power development in the future, and the development of foreign hydropower is also in the ascendant. With the development of hydropower generation technology, large and super large hydropower stations have gradually become the mainstream of hydropower construction projects. For example, the domestic Wudongde hydropower project has a single-unit installed capacity of 850,000 kilowatts and a total installed capacity of 10.2 million kilowatts. The single-unit installed capacity of the Baihetan Hydropower Project has reache...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/08C22C38/18C22C38/12C22C38/16C22C38/14C22C38/02C22C38/06C22C33/04C21C7/06C21C7/064C21C7/10C21D8/02
CPCC21C7/0006C21C7/0037C21C7/06C21C7/064C21C7/10C21D8/0221C21D8/0226C21D8/0263C21D2211/002C21D2211/005C22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C22C38/32
Inventor 李红文李经涛常跃峰郭先喜肖强健任振海宁康康张兴国肖登纯
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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