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Chromium-molybdenum alloy heat-resistant steel plate and manufacturing method thereof

A chrome-molybdenum alloy and steel plate technology, which is applied in the field of metal material manufacturing, can solve problems such as unqualified ultrasonic inspection, low yield of steel ingots, and slow cooling of steel plates, etc., and achieve excellent cold and hot processing performance, good comprehensive structure performance, and stable structure. performance effect

Inactive Publication Date: 2016-01-20
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Usually, the production of chromium-molybdenum alloy heat-resistant steel plates is basically smelted in an electric furnace, cast ingots, and temperature-controlled rolling. The smelting time is long, the impurity elements in the steel are not easy to control, and the yield of steel ingots is low and the cost is high; temperature-controlled rolling reduces the cost. Productivity
The steel plate is not slowly cooled after rolling, the hydrogen in the steel plate cannot be completely precipitated, and the steel plate is prone to cracks, resulting in failure of the ultrasonic inspection

Method used

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  • Chromium-molybdenum alloy heat-resistant steel plate and manufacturing method thereof
  • Chromium-molybdenum alloy heat-resistant steel plate and manufacturing method thereof
  • Chromium-molybdenum alloy heat-resistant steel plate and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A chromium-molybdenum alloy heat-resistant steel plate, the weight percentage of the steel plate is composed of: carbon 0.12%, silicon 0.25%, manganese 0.45%, phosphorus 0.010%, sulfur 0.002%, chromium 2.25%, molybdenum 1.00%, and the balance is iron and unavoidable impurities.

[0046] The manufacturing method is:

[0047] (1) Hot metal pretreatment: hot metal pretreatment includes desulfurization to 0.002%, after KR deep desulfurization pretreatment and slag removal, the bright side of hot metal is greater than 90%, hot metal temperature is 1267°C, and arsenic (As) in hot metal is ≤0.002 %.

[0048] (2) Converter smelting and deoxidation alloying: 0.06% carbon, 0.006% phosphorus, and 0.005% sulfur at the end of smelting, ferromolybdenum is added to the converter along with scrap steel, and ferroalloy, lime, and fluorite are added during tapping to make top slag; slag stoppers are used , Double slag blocking bar for tapping; deoxidation alloying, blowing argon in CAS f...

Embodiment 2

[0056] A chromium-molybdenum alloy heat-resistant steel plate, the weight percentage of the steel plate is composed of: carbon 0.08%, silicon 0.40%, manganese 0.55%, phosphorus 0.011%, sulfur 0.008%, chromium 2.50%, molybdenum 0.90%, and the balance is iron and unavoidable impurities.

[0057] The manufacturing method is:

[0058] (1) Hot metal pretreatment: hot metal pretreatment includes desulfurization to 0.002%, after KR deep desulfurization pretreatment and slag removal, the bright side of hot metal is greater than 90%, hot metal temperature is 1335°C, and arsenic (As) in hot metal is ≤0.003 %.

[0059] (2) Converter smelting and deoxidation alloying: 0.08% carbon, 0.007% phosphorus, and 0.003% sulfur at the end of smelting, ferromolybdenum is added to the converter along with scrap steel, and ferroalloy, lime, and fluorite are added to the converter during tapping; slag stoppers are used , Double slag blocking bar for tapping; deoxidation alloying, blowing argon in CAS...

Embodiment 3

[0067] A chromium-molybdenum alloy heat-resistant steel plate, the weight percentage of the steel plate is composed of: carbon 0.16%, silicon 0.35%, manganese 0.60%, phosphorus 0.012%, sulfur 0.006%, chromium 2.00%, molybdenum 0.90%, and the balance is iron and unavoidable impurities.

[0068] The manufacturing method is:

[0069] (1) Hot metal pretreatment: hot metal pretreatment includes desulfurization to 0.005%, after KR deep desulfurization pretreatment and slag removal, the bright side of hot metal is greater than 90%, hot metal temperature is 1250 ° C, arsenic (As) in hot metal ≤ 0.003 %.

[0070] (2) Converter smelting and deoxidation alloying: 0.10% carbon, 0.008% phosphorus, and 0.002% sulfur at the end of smelting, ferromolybdenum is added to the converter along with scrap steel, and ferroalmanganese, lime, and fluorite are added to make top slag during tapping; slag stoppers are used , Double slag blocking bar for tapping; deoxidation alloying, blowing argon in C...

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Abstract

The invention belongs to the technical field of metal material manufacturing, and particularly relates to a chromium-molybdenum alloy heat-resisting steel plate and a manufacturing method thereof. The chromium-molybdenum alloy heat-resisting steel plate comprises, by weight, 0.08 % to 0.16 % of carbon, 0.15 % to 0.50 % of silicon, 0.30 % to 0.60 % of manganese, less than or equal to 0.015% of phosphorous, less than or equal to 0.010 % of sulfur, 2.0 % to 2.50 % of chromium and 0.9 % to 1.10 % of molybdenum, and the balance iron and inevitable impurities. The manufacturing method of the chromium-molybdenum alloy heat-resisting steel plate comprises the following steps that iron water is preprocessed; converter smelting and deoxidization alloying are conducted, refining is conducted, slab continuous casting is conducted, slab stacking slow cooling and reheating are conducted, high pressure water dephosphorization and slab rolling are conducted, steel plate stacking encapsulating slow cooling is conducted, and thermal processing is conducted. According to the chromium-molybdenum alloy heat-resisting steel plate and the manufacturing method of the chromium-molybdenum alloy heat-resisting steel plate, steel plates made through the manufacturing method and adopting the element combination of the weight part ratio used by the manufacturing method have stable structure property, good high temperature property, good welding property and good hot and cold processing properties.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacturing, and in particular relates to a chromium-molybdenum 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., while thermal power accounts for 70% of the total power generation. Chromium-molybdenum alloy heat-resistant steel plates for large-scale high-parameter power plant boilers such as high pressure, ultra-high pressure, subcritical, supercritical, and ultra-supercritical demand has increased substantially. [0003] Chromium-molybdenum alloy heat-resistant steel plates for boilers have been used in high-temperature environments fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/22C21D8/02
Inventor 夏茂森蒋善玉孙卫华孙风晓张磊宋振官魏代斌
Owner JIGANG GRP
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