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Super duplex stainless steel S32750 medium plate rolling process

A technology of duplex stainless steel and medium plate, applied in the field of steel rolling process, can solve problems such as cracks and steel plate scrap, and achieve the effects of reducing production costs, improving enterprise economic benefits, and increasing heating process temperature.

Active Publication Date: 2013-09-11
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is light, it will form cracks that are not planned, and if it is heavy, it will cause the entire steel plate to be scrapped

Method used

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  • Super duplex stainless steel S32750 medium plate rolling process
  • Super duplex stainless steel S32750 medium plate rolling process
  • Super duplex stainless steel S32750 medium plate rolling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: Comparative Example 1

[0028] The method of rolling super duplex stainless steel S32750 medium plate according to the original process:

[0029] 1. Billet specifications and finished product specifications

[0030] Blank specification: 160*1238*1600mm; finished product specification: 11.5*1550*6000mm

[0031] 2. Heating process

[0032] Total heating time 176 minutes

[0033]

[0034] 3. Rolling process

[0035] (1) The rolling temperature of the second roll is 1030°C, and the width is 200mm;

[0036] (2) The four-roll start rolling temperature is 980°C and the finish rolling temperature is 725°C;

[0037] (3) The feeding thickness of the two rollers is 41mm;

[0038] (4) Reduction pass and pass reduction rate: 11 passes for two-rollers, and the pass reduction rate is less than 20%, 13 passes for four-rollers, and the pass reduction rate is less than 20%;

[0039] 4. Rolling result

[0040] Due to the low heating temperature, many rolling passe...

Embodiment 2

[0041] Embodiment 2: comparative example 2

[0042] The method of rolling super duplex stainless steel S32750 medium plate according to the original process:

[0043] 1. Billet specifications and finished product specifications

[0044] Blank specification: 150*1238*1700mm; finished product specification: 11.5*1550*6000mm

[0045] 2. Heating process

[0046] Total heating time is 168 minutes

[0047]

[0048] 3. Rolling process

[0049] (1) The rolling temperature of the second roll is 1050°C, and the width is 200mm;

[0050] (2) The four-roll start rolling temperature is 990°C, and the finish rolling temperature is 780°C;

[0051] (3) The feeding thickness of the two rollers is 26mm;

[0052] (4) Reduction pass and pass reduction rate: 13 passes with two rolls, reduction rate of each pass is less than 20%, 11 passes with four rolls, reduction rate of each pass is less than 20%;

[0053] 4. Rolling results

[0054] The feeding material of the second roll is relati...

Embodiment 3

[0056] Carry out the method for super duplex stainless steel S32750 plate rolling according to technology of the present invention:

[0057] (1) Select the medium plate rolling billet and finished product specifications:

[0058] Blank specification: Thickness*Width*Length corresponds to blank specification: 130*1238*1950mm,

[0059] Finished product specifications: thickness*width*length corresponds to 11.5*1550*6000mm;

[0060] (2) heating

[0061] Push the billet into the pusher type heating furnace for heating. The billet in the furnace should run at a constant speed to achieve uniform heating. During the process, the phenomenon of waiting for heating or waiting for time is not allowed. The billet is heated from 1100°C to 1250°C, and the temperature is controlled during the soaking stage At 1230-1250°C, the residence time of the continuous casting slab is 8-12min / 10mm;

[0062] Total heating time is 150 minutes

[0063]

[0064] (3) High pressure water descaling

...

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Abstract

The invention discloses a super duplex stainless steel S32750 medium plate rolling process which includes blank selection, heating, high-pressure water descaling, two-roll rough rolling, and four-roll finish rolling. By increasing heating temperature, reducing rolling pass, and increasing finish rolling temperature of steel plates, edge cracks and partial cracks on the surface of the steel plates are reduced, medium plate rejection rate is lowered, rolling yield is increased, and contract fulfillment rate is increased.

Description

technical field [0001] The invention relates to a super duplex stainless steel S32750 medium plate rolling process, which belongs to the field of steel rolling process. Background technique [0002] Super duplex stainless steel S32750 was developed by the Swedish SANDVIC company in the 1980s. Due to its ultra-low carbon and high chromium, high molybdenum and high nitrogen composition design, the pitting resistance constant PREN value is greater than 40, making it have a high Strength, excellent chloride stress corrosion resistance and other characteristics, mainly used in harsh environments such as petroleum and petrochemical, seawater desalination and nuclear energy. [0003] Duplex stainless steel has a two-phase structure of ferrite and austenite. Due to the inconsistency of deformation resistance and deformation behavior of the two-phase structure, cracks are easily formed during hot working, especially at low temperature. Therefore, its production is very difficult. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/26B21B37/28B21B37/74
Inventor 李姚兵张宝莲罗团王文峰杨明永尹世平王培智李国平郭振洁
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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