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High-strength alloy steel plate for pressure vessel and preparation method thereof

A technology of alloy steel plate and pressure vessel, which is applied in the field of high-strength alloy steel plate for pressure vessel and its preparation, can solve the problems of unfavorable use safety and high brittle transition temperature, and achieve the effects of improving safety, low brittle transition temperature and reducing cost.

Inactive Publication Date: 2017-02-22
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to ensure the high-temperature performance of steel, people usually ignore the toughness of steel. The general high-temperature-resistant steel plate only requires Charpy V-shaped impact energy ≥ 34J at 20°C. The brittle transition temperature of steel is high, which is not conducive to the safety of steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The thickness of the production steel plate is 100mm.

[0036] 1. The chemical composition is (percentage by weight): carbon 0.23%, silicon 0.37%, manganese 1.54%, phosphorus 0.015%, sulfur 0.002%, vanadium 0.18%, nickel 0.63%, and the balance is iron and unavoidable impurities.

[0037] 2. Preparation method:

[0038] (1) Converter smelting: electrolytic nickel is added into the converter together with the scrap steel, the basicity target is 2.9, the end target C is 0.12%, P0.010%, S0.006%; the ladle is guaranteed to be blown with argon throughout the tapping process;

[0039](2) Deoxidation alloying: add composite deoxidizer AlMnTi for pre-deoxidation when tapping, add liquid steel purifier to purify molten steel in ladle, add alloy before 4 / 5 of tapping, alloy addition sequence: high carbon ferromanganese → manganese Silicon alloy → aluminum block → ferrovanadium, after tapping, argon blowing time is 16 minutes (including tapping argon blowing), feeding aluminum wir...

Embodiment 2

[0046] The thickness of the production steel plate is 50mm.

[0047] 1. The chemical composition of the steel plate is (percentage by weight): carbon 0.22%, silicon 0.30%, manganese 1.47%, phosphorus 0.012%, sulfur 0.005%, vanadium 0.17%, nickel 0.56%, and the balance is iron and unavoidable impurities.

[0048] 2. Preparation method:

[0049] (1) Converter smelting: electrolytic nickel is added into the converter together with scrap steel, the target of alkalinity is 3.0, the target of end point is C 0.10%, P0.007%, S0.005%; during the tapping process, ensure that the ladle is blown with argon throughout;

[0050] (2) Deoxidation alloying: add composite deoxidizer AlMnTi for pre-deoxidation when tapping, add liquid steel purifier to purify molten steel in ladle, add alloy before 4 / 5 of tapping, alloy addition sequence: high carbon ferromanganese → manganese Silicon alloy → aluminum block → ferrovanadium, after tapping, argon blowing time is 15 minutes (including tapping argo...

Embodiment 3

[0057] The thickness of the production steel plate is 6mm.

[0058] 1. The chemical composition of the steel plate is (percentage by weight): 0.21% carbon, 0.28% silicon, 1.38% manganese, 0.014% phosphorus, 0.003% sulfur, 0.16% vanadium, 0.47% nickel, and the balance is iron and unavoidable impurities.

[0059] 2. Preparation method:

[0060] (1) Converter smelting: electrolytic nickel is added into the converter together with scrap steel, the target alkalinity is 3.1, the end target C is 0.08%, P0.009%, S0.005%; during the tapping process, ensure that the ladle is blown with argon throughout;

[0061] (2) Deoxidation alloying: add composite deoxidizer AlMnTi for pre-deoxidation when tapping, add liquid steel purifier to purify molten steel in ladle, add alloy before 4 / 5 of tapping, alloy addition sequence: high carbon ferromanganese → manganese Silicon alloy→aluminum block→ferrovanadium, after tapping, argon blowing time is 13 minutes (including tapping argon blowing), feedi...

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Abstract

The invention belongs to the technical field of metal material manufacture and particularly relates to a high-strength alloy steel plate for a pressure vessel and a preparation method thereof. The high-strength alloy steel plate for the pressure vessel comprises the following components by weight percentage: 0.20-0.25% of carbon, 0.20-0.40% of silicon, 1.35-1.60% of manganese, less than or equal to 0.018% of phosphorus, less than or equal to 0.008% of sulphur, 0.14-0.18% of vanadium, 0.40-0.70% of nickel and the balance of iron and unavoidable impurities. The high-strength alloy steel plate for the pressure vessel is high in strength and tenacity, low in yield ratio and good in welding performance and can be widely used in the pressure vessel manufacture.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacturing, and in particular relates to a high-strength alloy steel plate for pressure vessels and a preparation method thereof. Background technique [0002] With the rapid development of the national economy, power generation, metallurgy, chemical industry, food, papermaking and other technologies continue to improve, the demand for pressure vessels used in high-temperature and low-temperature environments has increased significantly, and the demand for high-strength alloy steel plates for pressure vessels is increasing. . [0003] Pressure vessels are generally used in environments such as high temperature and high pressure, and have high safety requirements. Not only is the steel plate required to have good high temperature resistance, but it also needs to have a lower yield ratio, which is conducive to improving formability; and is conducive to ensuring safety in use. [0004] In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21D8/02
CPCC21D8/0231C21D8/0247C22C38/02C22C38/04C22C38/08C22C38/12
Inventor 夏茂森蒋善玉刘晓东宋振官彭海红郭占武崔艳玲曹爱青
Owner SHANDONG IRON & STEEL CO LTD
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