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Steel plate for low-temperature pressure container and manufacturing method thereof

A technology for a pressure vessel and a manufacturing method, which is applied to the steel plate for low-temperature pressure vessel and its manufacturing field, can solve the problems of insufficiency, increased cost, difficult heating and rolling process, etc., and achieves low production cost, improved technical level, and improved transportation efficiency. and economic effects

Active Publication Date: 2018-04-20
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used nickel-based low-temperature steels include 1.5Ni, 2.5Ni, 3.5Ni, 5Ni and other high-Ni-containing steels. Nickel-based low-temperature steels have the following problems: 1) Ni is a relatively expensive element, about 280,000 yuan / ton, Increased cost; 2) The cast slab of Ni-containing steel tends to form dense oxide scales that are difficult to remove when heated, which brings difficulties to the heating and rolling process
The disadvantage of this steel is that the pearlite content in the steel is more than 25%, and the low temperature impact toughness can only meet -40℃KV 2 requirements, and cannot meet the requirements of steel for low temperature below -70°C

Method used

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  • Steel plate for low-temperature pressure container and manufacturing method thereof
  • Steel plate for low-temperature pressure container and manufacturing method thereof
  • Steel plate for low-temperature pressure container and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1~7

[0036] Examples 1-7 all produced steel according to the following steps:

[0037] 1) Through converter smelting to realize vanadium microalloying, blowing nitrogen at the bottom of the ladle furnace to heat up, vacuum to remove gas inclusions and control the level of N content in steel to achieve vanadium-nitrogen microalloying. After continuous casting, the billet is heated and controlled The heating temperature is 1170~1260℃, and the heating rate is controlled at 8~14min / cm;

[0038] 2) For hot rolling, control the start-rolling temperature to be no less than 1070°C, control the cumulative reduction of the last three passes to be no less than 30%; control the final rolling temperature to be no less than 860°C;

[0039] 3) The normalizing process is used for heat treatment, the normalizing temperature is controlled at 920~960℃, and the heat preservation time: 30~40 minutes + plate thickness in millimeters × 1 minute / mm.

[0040] Among them, Table 1 shows the chemical composition valu...

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Abstract

The invention discloses a steel plate for a low-temperature pressure container and a preparation method of the steel plate, the steel comprises the chemical components of, by weight, 0.110-0.140% of C, less than or equal to 0.15% of Si, 1.30-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.21-0.30% of V, 0.0090-0.0220% of N, less than or equal to 0.020% of Alt,and the balance Fe and inevitable impurities, and meanwhile, the components satisfy the conditions that V / C is greater than or equal to 1.6 but smaller than or equal to 2.8 and V / (C+Si) is greater than or equal to 0.9 but smaller than or equal to 1.25 simultaneously. According to the steel plate for the low-temperature pressure container and the manufacturing method thereof, the steel strength ishigh, the low-temperature impact toughness is good, KV<2> is greater than or equal to 100 J at -70 DEG C, an excellent manufacturing material is provided for the low-temperature pressure container, afoundation is laid for the large scale and light weight of the movable type pressure container, and the carrying efficiency and the economic benefit of the movable type pressure container are greatlyimproved.

Description

Technical field [0001] The invention relates to low alloy steel, in particular to a steel plate for low-temperature pressure vessels and a manufacturing method thereof. Background technique [0002] The importance of refrigeration and cryogenic technology in modern industry and scientific research is increasing, and the application of cryogenic equipment in the national economy is also becoming more and more extensive. The design of cryogenic machinery will eventually face two problems. One is to select the appropriate material for manufacturing this device; the other is to calculate the strength of the selected material under working conditions. Different from general engineering design, the selection of low-temperature equipment materials is largely restricted by low-temperature working conditions and material mechanical forces and physical properties. Therefore, understanding the special properties of materials at low temperatures, possessing their physical property data, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02C21D1/28
CPCC21D1/28C21D8/0226C21D8/0263C21D2211/005C21D2211/009C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 王宪军李书瑞刘文斌战国锋杨秀利洪霞
Owner 武汉钢铁有限公司
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