Ultrathick normalizing high-intensity pressure container steel plate and production method thereof

A steel plate production method and pressure vessel technology, which are applied in the field of steel products, can solve the problems of not being able to improve the rolled strength and thermal strength of steel plates, and cannot guarantee mechanical properties, so as to achieve good internal quality, good lamellar tear resistance, The effect of high production costs

Active Publication Date: 2018-11-06
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No Cr element is added to the above-mentioned invention components, which cannot improve the strength and thermal strength of the steel plate in the a

Method used

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  • Ultrathick normalizing high-intensity pressure container steel plate and production method thereof
  • Ultrathick normalizing high-intensity pressure container steel plate and production method thereof
  • Ultrathick normalizing high-intensity pressure container steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] The P355GH extra-thick normalized high-strength container steel of this embodiment is prepared from the following components by mass percentage:

[0022] C

[0023] Others are Fe and inevitable impurities.

[0024] The production and preparation method of the P355GH extra-thick pressure vessel steel of the present embodiment is as follows:

[0025] 1) Smelting process: After the raw molten iron is pretreated, it is smelted in a 120t top-bottom double blowing converter. After the converter is tapped, the ladle is blown with argon for 15 minutes and fed with aluminum wire for deoxidation treatment. The molten steel is sent to the LF refining furnace for refining, and then vacuumized in the VD furnace. Treatment, the vacuum time is 15 minutes, after the treatment, the calcium iron wire is fed 2m / t, and the argon is softly blown for 15 minutes after feeding the wire;

[0026] 2) Casting process: After the VD furnace treatment, the molten steel ...

Example Embodiment

[0035] Example 2

[0036] The P355GH extra-thick normalized high-strength container steel of this embodiment is prepared from the following components by mass percentage

[0037] C

[0038] Others are Fe and inevitable impurities.

[0039] The production and preparation method of the P355GH extra-thick normalized high-strength container steel of this embodiment is the same as that of the embodiment 1. The difference is that the thickness of the raw material blank after the vacuum electron beam welding of the 3-layer continuous casting blank is 830 mm, and the heating time of the composite blank in the heating furnace is 23 mm. Hour.

[0040]

[0041] The normalizing temperature was 912°C, and the furnace time was 230 minutes.

[0042] like figure 2 Shown: the metallographic structure at the composite interface has no obvious interface and delamination, and the microstructure reaches interatomic bonding after rolling.

Example Embodiment

[0043] Example 3

[0044] The P355GH extra-thick normalized high-strength container steel of this embodiment is prepared from the following components by mass percentage:

[0045] C

[0046] Others are Fe and inevitable impurities.

[0047] The production and preparation method of the P355GH extra-thick normalized high-strength container steel of this embodiment is the same as that of the embodiment 1. The difference is that the thickness of the raw material billet after the vacuum electron beam welding of the 3-layer continuous casting billet is 840 mm, and the heating time of the composite billet in the heating furnace is 24 mm. Hour.

[0048]

[0049] The normalizing temperature was 909°C, and the furnace time was 260 minutes.

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Abstract

The invention discloses an ultrathick normalizing high-intensity pressure container steel plate and a production method thereof. The ultrathick normalizing high-intensity pressure container steel plate is prepared from 0.19 to 0.22 percent of C, 0.25 to 0.60 percent of Si, 1.45 to 1.60 percent of Mn, smaller than and equal to 0.010 percent of P, smaller than and equal to 0.005 percent of S, 0.030to 0.040 percent of Nb, 0.20 to 0.30 percent of Ni, 0.020 to 0.030 percent of Ti, 0.010 to 0.020 percent of V, 0.20 to 0.30 percent of Cr, 0.015 to 0.3 percent of Cu, 0.020 to 0.045 percent of Alt andthe balance of Fe and unavoidable impurities. The thickness of the steel plate is 180 to 250 mm; the normalizing state thickness 1/2 position tensile intensity Rm is greater than or equal to 600 Mpa;the simulated post-welding heat treatment state steel plate thickness 1/2 tensile intensity Rm is greater than or equal to 550 Mpa.

Description

technical field [0001] The invention belongs to the field of iron and steel products, and in particular relates to an extra-thick normalized high-strength pressure vessel steel plate and a production method thereof. Background technique [0002] With the rapid development of my country's petroleum, petrochemical and other industries, under the guidance of the national coastal energy reserve strategy, the market demand for the thickness and strength of pressure vessel steel continues to increase, which puts forward pressure vessel steel production units. In order to meet higher requirements, the existing production process needs to be improved urgently. Among them, P355GH is the pressure vessel grade in the European standard. Because of its low production cost, high strength and good welding performance, it has been widely used in the manufacture of boiler and pressure vessel equipment, and has very broad market demand at home and abroad. At present, domestic production of P3...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/48C22C38/50C22C38/46C22C38/42C22C38/06C21D1/28B21C37/02
CPCB21C37/02C21D1/28C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 欧阳鑫胡昕明王储李文斌孙殿东王勇颜秉宇胡海洋李广龙隋松岩
Owner ANGANG STEEL CO LTD
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