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Steel plate for low-temperature spherical tank container and production method thereof

A production method and steel plate technology, applied to the 0.5NiDR steel plate for low-temperature spherical tanks and its production field, can solve the problems of high cost and poor Z-direction performance, achieve good welding performance, enhance market competitiveness, and reduce costs Effect

Active Publication Date: 2015-09-16
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical properties of domestic large-thickness, large-weight steel, such as negative temperature impact energy at 1 / 2 of the plate thickness, especially the Z-direction performance is not good, and the production cost is high, resulting in domestic large-thickness, large single-weight steel plates for low-temperature pressure vessels Can not meet market demand

Method used

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  • Steel plate for low-temperature spherical tank container and production method thereof
  • Steel plate for low-temperature spherical tank container and production method thereof
  • Steel plate for low-temperature spherical tank container and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: The 0.5NiDR steel plate used for the low-temperature spherical tank container adopts the following composition and production process.

[0033] The thickness of this 0.5NiDR steel plate is 26mm, which is smelted from the following components by weight percentage: C 0.05%, Si 0.16%, Mn 1.57%, Ni 0.31%, P 0.008%, S 0.001%, Al 0.042%, Nb 0.039%, the balance is iron and unavoidable impurities.

[0034] The processing step of this 0.5NiDR steel plate production method is as follows:

[0035] (1) Casting process: the billet is produced by continuous casting process.

[0036] (2) Heating process: all steel billets are subjected to Group II steel heating system; the maximum heating temperature of steel billets is 1220°C, the soaking temperature is 1200°C, and the total heating time is 12min / cm.

[0037] (3) Rolling process: After the steel billet is heated, the final rolling temperature of the first stage is 1070°C; the starting rolling temperature of the second...

Embodiment 2

[0041] Embodiment 2: The 0.5NiDR steel plate used for the low-temperature spherical tank container adopts the following composition and production process.

[0042] The thickness of this 0.5NiDR steel plate is 40mm, which is smelted from the following components by weight: C 0.12%, Si 0.35%, Mn 1.24%, Ni 0.80%, P 0.006%, S 0.003%, Al 0.034%, Nb 0.028%, the balance is iron and unavoidable impurities.

[0043] The processing step of this 0.5NiDR steel plate production method is as follows:

[0044] (1) Casting process: the billet is produced by continuous casting process.

[0045] (2) Heating process: all steel billets are subjected to Group II steel heating system; the maximum heating temperature of steel billets is 1220°C, the soaking temperature is 1180°C, and the total heating time is 14min / cm.

[0046] (3) Rolling process: After the billet is heated, the final rolling temperature of the first stage is 1050°C; the starting temperature of the second stage rolling is 900°C, ...

Embodiment 3

[0050] Embodiment 3: The 0.5NiDR steel plate used for the low-temperature spherical tank container adopts the following composition and production process.

[0051] The thickness of the 0.5NiDR steel plate is 8mm, which is smelted from the following components by weight: C 0.10%, Si 0.15%, Mn 1.38%, Ni 0.65%, P 0.010%, S 0.004%, Al 0.026%, Nb 0.031%, the balance is iron and unavoidable impurities.

[0052] The processing step of this 0.5NiDR steel plate production method is as follows:

[0053] (1) Casting process: the billet is produced by continuous casting process.

[0054] (2) Heating process: all steel billets are subjected to Group II steel heating system; the maximum heating temperature of steel billets is 1220°C, the soaking temperature is 1190°C, and the total heating time is 10min / cm.

[0055] (3) Rolling process: After the billet is heated, the final rolling temperature of the first stage is 1100°C; the starting temperature of the second stage rolling is 930°C, an...

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Abstract

The invention discloses a steel plate for a low-temperature spherical tank container and a heat treatment production method thereof. The steel plate is prepared from less than or equal to 0.12wt% of C, 0.15-0.50wt% of Si, 1.2-1.6wt% of Mn, 0.3-0.8wt% of Ni, less than or equal to 0.010wt% of P, less than or equal to 0.005wt% of S, 0.020-0.045wt% of Al, less than or equal to 0.040wt% of Nb and the balance Fe and unavoidable impurities by melting. The steel plate utilizes low-price carbon and manganese solid solution reinforcement, and through adjustment optimization of a ratio of other elements in the steel plate, good steel plate mechanical properties are ensured under conditions of low carbon equivalent, the steel plate has a good microstructure, good comprehensive performances and welding performances, a cost is reduced and market competitiveness is improved. Through a reasonable heat treatment technology, a uniform ferrite-tempered sorbite microstructure is obtained and impact toughness of a large-thickness steel plate is improved. The steel plate has high purity, impact energy greater than 170J at a temperature of -70 DEG C, an elongation rate of more than 25%, good simulation of performances after welding and welding performances, and good mechanical properties.

Description

technical field [0001] The invention relates to a steel plate for a low-temperature pressure vessel and a production method thereof, in particular to a 0.5NiDR steel plate for a low-temperature spherical tank vessel and a production method thereof. Background technique [0002] Since the 1990s, Wugang has successfully mass-produced 16MnDR, 15MnNiDR, 09MnNiDR, SA203E (08Ni3DR, 3.5Ni) and other low-temperature pressure vessel steel plates (minimum service temperature -70°C), which are widely used in the manufacture of low-temperature welded pressure vessels; change It broke the long-term dependence on imports of steel plates for low-temperature equipment in China, and made positive contributions to the localization of low-temperature equipment for large-scale projects. [0003] The steel plates for low-temperature pressure vessels produced by Wuyang Iron and Steel Co., Ltd. have pure steel, low inclusion content, excellent performance, good strength-toughness and low-temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22C38/08C22C38/12
Inventor 刘丹贾国生谢良法韦明彭世宝李杰刘利香宋庆吉张海军张志军高雅徐腾飞王晓书
Owner WUYANG IRON & STEEL
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