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Austenic stainless steel strip and manufacturing method thereof

A technology of austenitic stainless steel and manufacturing method, which is applied in the direction of manufacturing tools, metal rolling, temperature control, etc., can solve the problems of reduced pitting resistance, aggravated crack tendency, reduced service performance, etc., and achieves the reduction of ferrite content , Reduce the amount of ferrite, improve the effect of corrosion resistance

Active Publication Date: 2009-07-15
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the ferrite in austenitic stainless steel reaches a certain content, the crack tendency will be aggravated during hot working, and it will also lead to a decrease in pitting resistance and greatly reduce the service performance of the steel
The commonly used method to reduce the amount of ferrite is to reduce the Cr / Ni equivalent ratio, so that the content of Ni needs to be increased. Ni is an expensive strategic element, which will greatly increase the production cost

Method used

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  • Austenic stainless steel strip and manufacturing method thereof
  • Austenic stainless steel strip and manufacturing method thereof
  • Austenic stainless steel strip and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1 comprises the steps in turn:

[0055] 1) Chemical composition of molten steel (wt%): C=0.08%, Si=0.4%, Mn=2%, P=0.021%, S=0.006%, Cr=19%, Ni=7%, Cu=0.5%, The balance is Fe and unavoidable impurities;

[0056] 2) Smelting according to the above ingredients, forming a 2.3mm cast strip through twin-roll thin strip continuous casting, controlling cooling, and coiling the cast strip at 590°C;

[0057] 3) Pickling is then carried out, and then cold rolling is carried out. The reduction ratio of the first cold rolling is 14%. The strip steel after cold rolling is annealed in a bell annealing furnace. The annealing temperature is 1080° C., and the annealing time is 7 minutes ;

[0058] 4) pickling and cold rolling again, the reduction rate of the second cold rolling is 45%, the strip steel after cold rolling is annealed in a bell annealing furnace, the annealing temperature is 1100 ℃, and the annealing time is 3.5min;

[0059] 5) pickling and cold rolling again,...

Embodiment 2

[0062] Embodiment 2 comprises the steps in turn:

[0063]1) Chemical composition of molten steel (wt%): C=0.12%, Si=0.85%, Mn=0.8%, P=0.035%, S=0.03%, Cr=17%, Ni=9.3%, Cu=0.3%, The balance is Fe and unavoidable impurities;

[0064] 2) Smelting according to the above ingredients, forming a 2.0mm cast strip through twin-roll thin strip continuous casting, controlling cooling, and coiling the cast strip at 600°C;

[0065] 3) Carry out pickling then, carry out cold rolling again, the reduction rate of first cold rolling is 15%, the strip steel after cold rolling is annealed in bell annealing furnace, and annealing temperature is 1050 ℃, and annealing time is 6min ;

[0066] 4) pickling and cold rolling again, the reduction rate of the second cold rolling is 45%, the strip steel after cold rolling is annealed in a bell annealing furnace, the annealing temperature is 1150 ° C, and the annealing time is 4min;

[0067] 5) Pickling and cold rolling again, the third cold rolling redu...

Embodiment 3

[0070] Embodiment 3 comprises the steps in turn:

[0071] 1) Chemical composition of molten steel (wt%): C=0.04%, Si=1%, Mn=1.56%, P=0.04%, S=0.01%, Cr=17.4%, Ni=10%, Cu=0.25%, The balance is Fe and unavoidable impurities;

[0072] 2) Smelting according to the above ingredients, forming a 2.5mm cast strip through twin-roll thin strip continuous casting, controlling cooling, and coiling the cast strip at 600°C;

[0073] 3) Pickling is then carried out, and then cold rolling is carried out. The reduction ratio of the first cold rolling is 15%. The strip steel after cold rolling is annealed in a bell annealing furnace. The annealing temperature is 1120° C., and the annealing time is 4 minutes ;

[0074] 4) pickling and cold rolling again, the reduction ratio of the second cold rolling is 40%, the strip steel after cold rolling is annealed in a bell annealing furnace, the annealing temperature is 1070 ℃, and the annealing time is 7min;

[0075] 5) pickling and cold rolling agai...

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Abstract

The invention discloses an austenitic stainless steel belt and a manufacturing method thereof. The invention is characterized by comprising the following chemical elements in terms of weight percentage: 0.04 to 0.12 percent of C, 0.4 to 1. percent of Si, 0.8 to 2 percent of Mn, less than or equal to 0.04 percent of P, less than or equal to 0.03 percent of S, 17 to 19 percent of Cr, 7 to 10 percent of Ni, 0.25 to 0.5 percent of Cu and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: smelting; continuous casting with thin belts; control of cooling and winding; acid pickling, direct cold rolling and annealing; acid pickling again and cold rolling to achieve the thickness of a finished product; annealing after achieving the thickness of the finished belt steel, acid pickling, leveling, and length cutting into a finished coil. By utilizing the element of Cu, the invention reduces the use amount of Ni in the steel, reduces the production cost, simultaneously reduces the content of the residual ferrite in the steel, improves the wearing resistance of the steel, adopts direct cold rolling to match the high-temperature annealing procedure, and saves the procedures of hot rolling and solution treatment so as to lead the production process to be simple and stable.

Description

technical field [0001] The invention relates to stainless steel metallurgy technology, in particular to an austenitic stainless steel strip and a manufacturing method thereof. Background technique [0002] Stainless steel is widely used in food machinery, sanitation facilities, kitchens, architectural decoration, automobiles, chemicals and electrical products due to its good corrosion resistance, high temperature resistance, high strength and toughness, exquisite appearance and excellent processability. In the stainless steel market, the demand for stainless steel sheets accounts for more than 80%, and the main product is stainless steel cold-rolled sheets. [0003] The traditional production process of stainless steel strip is completed by continuous casting (or injection molding + forging), hot rolling and cold rolling. Generally, the thickness of the slab in the traditional continuous casting process is 200mm. There are two types of hot rolling production processes for ...

Claims

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Application Information

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IPC IPC(8): C22C38/42C22C38/58C21D8/02B21B37/16B21B37/74
Inventor 吴建春于艳方园
Owner BAOSHAN IRON & STEEL CO LTD
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