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A low-alloy heat-resistant steel plate and its manufacturing method

A low-alloy, steel plate technology, applied in the field of alloy material manufacturing, can solve problems such as no records, and achieve the effects of corrosion resistance to certain media, high temperature resistance, long-lasting strength, long-lasting plasticity, and stable organizational properties

Inactive Publication Date: 2015-07-29
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no records of high-quality low-alloy heat-resistant steel plates for utility boilers and their manufacturing methods.

Method used

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  • A low-alloy heat-resistant steel plate and its manufacturing method
  • A low-alloy heat-resistant steel plate and its manufacturing method
  • A low-alloy heat-resistant steel plate and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: The thickness of the produced steel plate is 80 mm.

[0032] A method for manufacturing a low-alloy heat-resistant steel plate, the steps are as follows:

[0033] 1) Hot metal pretreatment step: Desulfurization by KR hot metal pretreatment, the sulfur content after treatment is 0.003%, the hot metal temperature is 1269°C, and the arsenic content is 0.002%.

[0034]2) Converter smelting and deoxidation alloying steps: Converter smelting: target carbon content at the end point is 0.08%, P: 0.006%, S: 0.005%, and the target tapping temperature is 1620°C; double slag blocking with slag blocking plug and slag blocking rod Tapping; ferromolybdenum is added to the converter along with scrap steel, and ferroalmanganese, lime, and fluorite are added to make top slag during the tapping process; ferrochrome, silicon-manganese alloy, ferroalmanganese, and ferro-vanadium are added in turn for alloying, and the time for blowing argon during tapping is 14 minutes.

[0...

Embodiment 2

[0042] Embodiment 2: The thickness of the produced steel plate is 10mm.

[0043] A method for manufacturing a low-alloy heat-resistant steel plate, the steps are as follows:

[0044] 1) Hot metal pretreatment step: Desulfurization by KR hot metal pretreatment, the sulfur content after treatment is 0.002%, the hot metal temperature is 1250°C, and the arsenic content is 0.001%.

[0045] 2) Converter smelting and deoxidation alloying steps: Converter smelting: the final carbon content is 0.08%, P: 0.006%, S: 0.005%, and the tapping temperature is 1620°C; the slag blocking plug and the slag blocking rod are used to tap double slag blocking ; Ferromolybdenum is added to the converter along with scrap steel, and ferroalmanganese, lime, and fluorite are added to make top slag during the tapping process; ferrochrome, silicon-manganese alloy, ferroalmanganese, and ferro-vanadium are added in turn for alloying, and argon blowing time is 15 minutes during the tapping process .

[0046]...

Embodiment 3

[0053] Embodiment 3: The thickness of the steel plate involved in this embodiment is 40 mm.

[0054] A method for manufacturing a low-alloy heat-resistant steel plate, the steps are as follows:

[0055] 1) Hot metal pretreatment step: Desulfurization by KR hot metal pretreatment, the sulfur content after treatment is 0.003%, the hot metal temperature is 1256°C, and the arsenic content is 0.001%.

[0056] 2) Converter smelting and deoxidation alloying steps: Converter smelting: the final carbon content is 0.08%, P: 0.006%, S: 0.005%, and the tapping temperature is 1625°C; the slag blocking plug and the slag blocking rod are used to tap the steel; Ferromolybdenum is added to the converter along with scrap steel, and ferroalmanganese, lime, and fluorite are added to make top slag during the tapping process; ferrochrome, silicon-manganese alloy, ferroalmanganese, and ferro-vanadium are added in turn for alloying, and argon blowing time is 16 minutes during the tapping process.

...

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Abstract

The invention belongs to the technical field of alloy material manufacturing, and especially relates to a manufacturing method of a low-alloy heat-resistant steel plate and a manufacturing method thereof. According to the low-alloy heat-resistant steel plate and the manufacturing method thereof, the steel plate comprises the following components, by weight, 0.08-0.16% of carbon, 0.15-0.40% of silicon, 0.40-0.70% of manganese, no more than 0.015% phosphorus, no more than 0.010% of sulfur, 0.90-1.20% of chromium, 0.20-0.35% of molybdenum, 0.15-0.30% of vanadium, and balance of iron and unavoidable impurities. The steel plate is produced through the processes of converter smelting, LF+VD or RH out-furnace refining, slab continuous casting, slab stacking and slow cooling, re-heating, high pressure water phosphorus removing, slab rolling, steel plate stacking and slow cooling, normalizing+ tempering, and the like. The steel plate provided by the invention has good normal temperature and high-temperature properties, and the like, such that steel plate application safety under high-temperature environment is ensured. The steel plate is mainly used for manufacturing steel structural parts with a working temperature of 540-640 DEG C in a power plant boiler, such as end cap, lug, header, gas-saving device beam, steam pipe, superheater, reheater tube, and the like.

Description

technical field [0001] The invention belongs to the technical field of alloy material manufacturing, and in particular relates to a low-alloy heat-resistant steel plate and a manufacturing method thereof. Background technique [0002] With the rapid development of the national economy, the contradiction between power supply and demand has become increasingly prominent, and many large power stations have been established one after another in various places. Power generation mainly includes thermal power, hydropower, nuclear power, etc., and thermal power accounts for 70% of the total power generation. The demand for low-alloy heat-resistant steel plates for power plant boilers has increased significantly. [0003] Low-alloy heat-resistant steel plates for power plant boilers have been used in high-temperature environments for a long time, and the steel plates are required to have high high-temperature resistance and long-lasting plasticity, good oxidation resistance, corrosio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/24C21C5/30C21D1/28C21D1/18
Inventor 蒋善玉孙卫华夏茂森王金华孙风晓肖丰强周波李春梅
Owner JIGANG GRP
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