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Manufacturing technique of austenitic stainless steel cold-rolled plate with good surface performance

A technology of austenitic stainless steel, manufacturing technology, applied in the direction of manufacturing tools, coatings, grinding machines, etc., can solve the problem of increased nitriding layer thickness and surface nitrogen concentration, shallow, generally only reach tens of microns, technical devices and processes Complicated problems, to achieve the effect of improved wear resistance and corrosion resistance, excellent mechanical properties, and short nitriding time

Inactive Publication Date: 2010-02-17
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

In the past ten years, many researchers have used large beam rapid heating ion implantation, plasma immersion ion implantation (PIII), low-pressure plasma arc ion source, low-temperature low-pressure plasma source ion nitriding (PlasmaSource Ion Nitriding) and other surface modification methods. However, these technologies have obvious defects: first, the technical devices and processes are more complicated and the cost is higher; second, the thickness of the surface nitride layer Too shallow, generally can only reach tens of microns
[0005] In the application patents with publication numbers EP0652300 and CN1107187A, a surface nitriding method for forming a high-strength austenite surface layer in stainless steel is disclosed. Nitriding is carried out at a temperature between 1000 and 1200 ° C to make stainless steel close to the finished shape The surface of parts is partially enriched with dissolved nitrogen. The nitriding pressure of this method is not normal pressure, and a special heat treatment furnace is required for long-term nitriding treatment of stainless steel parts. Generally, the treatment time is as long as tens of hours, and the production efficiency is low. The surface layer is characterized by high toughness of the austenitic structure, resulting in significantly improved wear resistance especially in the case of impact wear, cavitation and cavitation erosion, suitable for extending the life of stainless steel parts in material flow machines
[0006] The patent application with publication number EP 890656A1 also adopted a similar method, nitriding at a temperature between 1000 and 1200°C for a long time, but the nitriding pressure is not constant throughout the nitriding process, but divided into two different nitriding pressures. At the stage, the 660mbar / 7.5h+220mbar / 7.5h process is used to replace the constant pressure 220mbar / 15h process, thereby accelerating the nitriding process, increasing the thickness of the nitriding layer and the concentration of nitrogen on the surface. This method is also suitable for stainless steel parts for a long time , Nitriding treatment under very low pressure

Method used

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  • Manufacturing technique of austenitic stainless steel cold-rolled plate with good surface performance
  • Manufacturing technique of austenitic stainless steel cold-rolled plate with good surface performance
  • Manufacturing technique of austenitic stainless steel cold-rolled plate with good surface performance

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Experimental program
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Effect test

Embodiment 1

[0032] Table 1 Chemical composition of 304 test paper (wt%)

[0033] Grade

C

Si

mn

P

S

Ni

Cr

N

304

0.049

0.39

1.13

0.026

0.002

8.06

18.02

0.044

[0034] The chemical composition of the 304 hot-rolled test coil with a specification of 4.0 mm is shown in Table 1. The hot-rolled test coils are first annealed and pickled, then cold-rolled to 1.2mm after pickling, and then shot-peened and degreased and degreased after cold-rolling. min, the shot peening speed is 78m / s. 304 stainless steel was annealed at 1150°C, normal pressure, and nitrogen-containing mixed atmosphere for 20 minutes, and water-cooled at a cooling rate of 5°C / S after annealing. The surface of the annealed austenitic stainless steel plate is ground to remove a 20 μm surface layer.

[0035] The microstructure observation and performance test were carried out on the 304 test roll sample (No. 304-1), an...

Embodiment 2

[0043] Table 3 Chemical composition of 304L test paper (wt%)

[0044] Grade

C

Si

mn

P

S

Ni

Cr

N

304L

0.012

0.36

1.26

0.02

0.002

8.16

18.28

0.058

[0045] The chemical composition of the 304L hot-rolled test coil with a specification of 4.0mm is shown in Table 3. The hot-rolled test coils are first annealed and pickled, then cold-rolled to 1.0mm after pickling, and then shot-peened and degreased and degreased after cold-rolling. min, the shot peening speed is 75m / s. 304L stainless steel was annealed for 20 minutes at 1150°C, normal pressure, and nitrogen-containing mixed atmosphere, and then water-cooled at a cooling rate of 4°C / s after annealing. The surface of the annealed austenitic stainless steel plate is ground to remove a 20 μm surface layer.

[0046] The microstructure observation and performance test were carried out on the 304L test roll sample (No. 30...

Embodiment 3

[0054] The cold working and annealing process of 304 austenitic stainless steel with a specification of 3.0mm is as follows: the hot-rolled test coil is annealed and pickled first, and then cold-rolled to 0.9mm after pickling. The shot size used in the shot is 0.05mm, the flow rate is 820kg / min, and the shot peening speed is 72m / s. Anneal 304 stainless steel for 10 minutes at 1200°C, normal pressure, and nitrogen-containing mixed atmosphere, and then water-cool at a rate of 6°C / S after annealing. The surface of the annealed austenitic stainless steel plate is ground to remove a 10 μm surface layer.

[0055] The thickness of the high nitrogen content surface layer formed on the surface of the stainless steel plate exceeds 60 μm, and its surface hardness is about HV 0.1 200. Pitting corrosion resistance E b100μA It reaches 460mV. Compared with the traditional industrial annealed board, the improvement range of various properties is between 10% and 50%.

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Abstract

The invention provides a manufacturing technique of an austenitic stainless steel cold-rolled plate with a good surface performance. In the technique, a high-nitrogen surface layer in a solid solutionstate is formed on the austenitic stainless steel cold-rolled plate by improving the subsequent annealing atmosphere and process parameters of the austenitic stainless steel. Due to the solution strengthening function of solid solution nitrogen atoms, the hardness and the abrasive resistance of the surface of the stainless steel plate are greatly improved, and simultaneously the corrosion resistance is also improved; and each performance is improved by 10 to 50 percent, so the service life of components and parts made of the steel plate is prolonged. The austenitic stainless steel cold-rolledplate with the good surface performance is applied in the industries of petrochemical engineering, foods and medicaments and the like, and in the fields of household furniture, building decoration and the like.

Description

technical field [0001] The invention relates to iron and steel materials, in particular, the invention relates to a manufacturing technology of austenitic stainless steel cold-rolled plate. Background technique [0002] Due to its high plasticity and corrosion resistance, good welding performance, low temperature toughness and easy processing, austenitic stainless steel 304 / 304L is widely used in energy, chemical, food, pharmaceutical and other industries, as well as daily furniture, architectural decoration, etc. It is the most widely used steel grade among all stainless steels. However, due to the low hardness and poor wear resistance of austenitic stainless steel 304 / 304L, its working life is greatly reduced, and its use is restricted to a certain extent. limit. [0003] Nitrogen alloying plays a significant role in austenitic stainless steel. Austenitic stainless steel adopts surface nitrogen alloying technology, which can improve the surface hardness, wear resistance a...

Claims

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Application Information

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IPC IPC(8): B23P17/00C21D8/02C21D1/26C21D7/06C23C8/26B24C1/10B24B27/033
Inventor 余式昌彭建国胡锦程奚雅敏
Owner BAOSHAN IRON & STEEL CO LTD
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