Rolling method of wide-width thin-specification 6Mo super austenitic stainless steel plate

A stainless steel plate, thin gauge technology, used in metal rolling, metal rolling, rolling mill control devices, etc., can solve the problems of limited product width, high rolling difficulty, high deformation resistance, etc., to increase safety and production difficulty. Large, high value-added effects

Active Publication Date: 2020-02-07
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of stainless steel has high strength at high temperature, high deformation resistance, and high difficulty in rolling, so it is difficult to make it thin and wide, and at the same time have a good shape
At present, hot continuous rolling is usually used for the production of thin gauge 6Mo steel, but this also limits the width of the finished product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Select the N08367 steel grade with a blank size of 115mm×1600mm×2610mm, the chemical composition is (weight percent): C: 0.019%, Mn: 0.27%, P: 0.026%, S: 0.001%, Si: 0.439%, Cr: 21.46 %, Ni: 23.23%, Mo: 6.35%, Cu: 0.207%, N: 0.198%, the balance Fe, the steel plate with the planned rolling product size of 8.5mm×2500mm×12000mm, the above-mentioned wide and thin specification 6Mo super austenitic The rolling method of solid stainless steel plate is as follows:

[0043] After passing the inspection of the appearance and size of the blank, it is sent to a walking heating furnace for heating. The time in the furnace is 235 minutes, the temperature in the soaking section is 1253-1265 ° C, the soaking time is 43 minutes, and the tapping temperature is 1258 ° C. In order to reduce the temperature drop, the high-pressure water tank is not descaled, and the rolling process is not descaled, but the purge is turned on. Adopt full cross rolling mode, use 4700mm four-high reversing r...

Embodiment 2

[0045]The difference between this example and Example 1 is that the N08367 steel grade with a billet size of 120mm×1650mm×2620mm is selected, the furnace time is 252min, the soaking section temperature is 1258-1270°C, the soaking section time is 50min, and the tapping temperature is 1256°C ;The reduction rate of the first pass is 17%, and the reduction rate of each pass increases by about 4% after that, until the reduction rate of the fifth pass is 38%, and then gradually decreases until the reduction rate of the 10th, 11th and 12th passes The down rates were 10%, 8%, and 5.2%.

Embodiment 3

[0047] The difference between this embodiment and embodiment 1 is that the N08367 steel grade with a billet size of 125mm×1700mm×2600mm is selected, the furnace time is 237.5min, the soaking section temperature is 1251-1263°C, the soaking section time is 50min, and the tapping temperature is 1256°C. ℃; the reduction rate of the first pass is 17%, and the reduction rate of each subsequent pass increases by about 4%, until the reduction rate of the fifth pass is 35%, and then gradually decreases until the reduction rate of the 10th, 11th and 12th passes The reduction rates were 10%, 9%, and 5.6%, respectively.

[0048] At present, most domestic 6Mo super austenitic stainless steel plates rely on imports. At the same time, the width of thin-gauge products is basically below 2000mm. It is necessary to use medium and heavy plate rolling mills instead of hot rolling technology to prepare plates with a thickness of 8 mm to 10 mm. The plate width exceeds 2000mm products are very diffi...

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Abstract

The invention discloses a rolling method of a wide-width thin-specification 6Mo super austenitic stainless steel plate. The rolling method includes the following steps that a blank which has the thickness of 110-125 mm, the width of 1500 mm or above and the length of 2550-2620 mm is adopted; the steel blank is sent to a stepping type heating furnace, the ratio of the total heating time to the thickness of the steel blank is controlled to be 15-22 min / cm, the temperature of a uniform heating section is 1230-1270 DEG C, the time for the uniform heating section is at least 30 min, and the tappingtemperature is 1240-1260 DEG C; full transverse rolling is performed through 12+1 rounds, the reduction rate is increased from 17% in the first round to 30-40% in the fifth round and is then gradually reduced, the reduction rate in the eleventh round is 7-9%, the reduction rate of the twelfth round is 4-6%, and air cooling is performed after rolling; and the solid solution temperature is 1160 DEGC, heat preservation is performed for 20 min, and water cooling is performed. The width of this type of finished products can be increased from 2000 nm in the prior art to 2500 mm.

Description

technical field [0001] The invention relates to the technical field of stainless steel rolling, in particular to a rolling method of a wide-width and thin-gauge 6Mo super austenitic stainless steel plate. Background technique [0002] Due to the extremely harsh service environment of materials in the fields of petroleum, chemical industry, electric power, military industry, and ocean development, traditional stainless steel can no longer meet the requirements of special industries and special functional fields. 6Mo super austenitic stainless steel has higher pitting corrosion resistance equivalent and can maintain good corrosion resistance in harsh environments, so it is widely used in flue gas desulfurization devices, chemical equipment, plate heat exchangers and other fields. In recent years, as the International Maritime Convention has restricted the emission of sulfur oxides in ship exhaust gas, the demand for ship flue gas desulfurization devices has increased sharply, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/38B21B45/00B21B37/74B21B37/16B21B37/22B21B37/56
CPCB21B1/38B21B37/16B21B37/22B21B37/56B21B37/74B21B45/004
Inventor 靳淑静党军曾周燏李东晖
Owner NANJING IRON & STEEL CO LTD
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