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Steel plate for seamless pressure vessel head and production process of steel plate

A technology for pressure vessels and steel plates, applied in the field of metallurgy, can solve the problems of numerous production processes, narrow fluctuation range, and high cost prices, and achieve the effects of avoiding quality risks, reducing production processes and production costs, and reducing production process costs.

Inactive Publication Date: 2015-04-29
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The production of pressure vessel heads with a nominal diameter greater than or equal to 3200mm requires the use of steel plates with a width greater than or equal to 3200mm, and the yield fluctuation range of the steel plates is required to be very narrow. At present, due to the influence of the production specification capacity of the rolling mill, the production of large-diameter heads used to be The steel plates are welded by using two or more steel plates. The production process includes steel plate blanking, welding, weld flaw detection, stamping, and painting. There are many production processes, high cost and high price, and there is a quality risk of weld cracking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The production process of the steel plate for the seamless pressure vessel head described in Example 1 uses a wide and thick plate production line to produce the slab. The components of the slab are C: 0.081%, Si: 0.23%, Mn: 1.04%, P: 0.014%, S: 0.003%, Alt: 0.027%, and the rest are Fe and unavoidable inclusion elements.

[0018] In the slab reheating process, the slab heating temperature: 1191°C, heat preservation for 4 hours and 40 minutes;

[0019] In the rolling process, the wide and thick plate rolling mill is rolled, and the rolling termination temperature is 852°C. After rolling, the steel plate is naturally cooled to room temperature in the air, and the steel plate width is 3700mm. The yield strength of the steel plate is 304Mpa, the tensile strength is 427Mpa, and the elongation is 28%. .

[0020] The steel plate is blanked into a circular steel plate with a diameter of 3700mm, so that the whole plate can be directly stamped and formed.

[0021] This embodime...

Embodiment 2

[0023] The production process of the steel plate for the seamless pressure vessel head of this embodiment uses a wide and thick plate production line to produce the slab. The components of the slab are C: 0.093%, Si: 0.26%, Mn: 0.97%, P: 0.012%, S: 0.003%, Alt: 0.031%, and the rest are Fe and unavoidable inclusion elements.

[0024] In the slab reheating process, the slab heating temperature: 1203°C, heat preservation for 4 hours and 12 minutes;

[0025] In the rolling process, the wide and thick plate rolling mill is rolled, and the rolling termination temperature is 874°C. After rolling, the steel plate is naturally cooled to room temperature in the air, and the steel plate width is 3850mm. The yield strength of the steel plate is 323Mpa, the tensile strength is 439Mpa, and the elongation is 26%. .

[0026] The steel plate is blanked into a circular steel plate with a diameter of 3850mm, so that the whole plate can be directly stamped and formed.

[0027] This embodiment r...

Embodiment 3

[0029] The production process of the steel plate for the seamless pressure vessel head of this embodiment uses a wide and thick plate production line to produce the slab. The components of the slab are C: 0.114%, Si: 0.23%, Mn: 0.84%, P: 0.009%, S: 0.002%, Alt: 0.033%, and the rest are Fe and unavoidable inclusion elements.

[0030] In the slab reheating process, the slab heating temperature: 1197°C, heat preservation for 3 hours and 55 minutes;

[0031] In the rolling process, the wide and thick plate rolling mill is rolled, and the rolling termination temperature is 869°C. After rolling, the steel plate is naturally cooled to room temperature in the air, and the steel plate width is 3700mm. The yield strength of the steel plate is 340Mpa, the tensile strength is 436Mpa, and the elongation is 33%. .

[0032] The steel plate is blanked into a circular steel plate with a diameter of 3700mm, so that the whole plate can be directly stamped and formed.

[0033] This embodiment r...

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Abstract

The invention relates to a steel plate for a seamless pressure vessel head and a production process of the steel plate. The steel plate comprises the following raw materials in percentage by weight: 0.08%-0.12% of C, 0.10%-0.30% of Si, 0.80%-1.20% of Mn, not more than 0.020% of P, not more than 0.005% of S, 0.01%-0.06% of Alt and the balance of Fe and inevitable mixed elements. The production process comprises a plate blank reheating procedure, a rolling procedure and a steel plate feeding procedure. Through reasonable component design and rolling process, a Q295A steel plate of which the width is greater than or equal to 3200mm is produced; the yield strength of the steel plate fluctuates within the range of 295-345MPa and does not exceed 50MPa; the steel plate is good in molding property; the overall plate is stamped and molded after feeding; a welding procedure and a weld joint detection procedure are concealed; the production procedure and the production cost are greatly reduced; and the quality risk of cracking of the weld joint is avoided.

Description

technical field [0001] The invention relates to a steel plate and a production process thereof, in particular to a steel plate for a seamless pressure vessel head and a production process thereof, belonging to the technical field of metallurgy. Background technique [0002] The production of pressure vessel heads with a nominal diameter greater than or equal to 3200mm requires the use of steel plates with a width greater than or equal to 3200mm, and the yield fluctuation range of the steel plates is required to be very narrow. At present, due to the influence of the production specification capacity of the rolling mill, the production of large-diameter heads used to be The steel plates are welded by two or more steel plates. The production process includes steel plate blanking, welding, weld flaw detection, stamping, and painting. There are many production processes, high cost and high price, and there is a quality risk of weld cracking. Contents of the invention [0003] ...

Claims

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Application Information

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IPC IPC(8): C22C38/06C21D8/02
CPCC22C38/02C21D8/0205C21D8/0226C22C38/04C22C38/06
Inventor 潘中德李志强郭怀兵郑东升周敏
Owner NANJING IRON & STEEL CO LTD
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