A kind of high-strength plastic nano/submicron crystal cold-rolled 304 stainless steel strip and its preparation method

A 304 stainless steel and nanotechnology, which is applied in the field of high-strength plastic nano/submicron crystal cold-rolled 304 stainless steel strip and its preparation, can solve the problems of increasing the risk of delayed cracking of materials, affecting the corrosion resistance of parts, affecting the forming of parts, etc. , to avoid the increase of intergranular corrosion tendency, reduce the risk of delayed cracking, and save energy.

Active Publication Date: 2021-03-26
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of cold deformation, certain deformation-induced martensite and residual stress will be generated in the structure, which will cause a significant decrease in plasticity, which will affect the further forming of complex parts, increase the risk of delayed cracking of the material, and also affect zero. Corrosion resistance of components during service

Method used

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  • A kind of high-strength plastic nano/submicron crystal cold-rolled 304 stainless steel strip and its preparation method
  • A kind of high-strength plastic nano/submicron crystal cold-rolled 304 stainless steel strip and its preparation method
  • A kind of high-strength plastic nano/submicron crystal cold-rolled 304 stainless steel strip and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The composition of the 304 stainless steel blank in this example is C: 0.055%, Si: 0.40%, Mn: 1.63%, Cr: 17.30%, Ni: 8.45%, Mo: 0.12%, Nb: 0.04%, V: 0.08%, The balance is Fe and other unavoidable impurities, and the total weight percentage of each component is 100%.

[0032] A kind of preparation method of high-strength plastic nano / submicron crystal cold-rolled 304 stainless steel strip of the present invention, comprises the following steps:

[0033] Step 1, forging and hot rolling:

[0034] Place the forged billet with a thickness of 50mm in a heating furnace and heat it to 1250°C with the furnace and hold it for 2h, then roll it on a hot rolling mill for 5 passes to form a hot-rolled sheet with a thickness of 4.5mm, and then roll it at a temperature of 30°C / s Cool quickly with water to room temperature. The starting rolling temperature is 1200°C, the final rolling temperature is 1050°C, and the total hot rolling reduction rate is 91%;

[0035] Step 2, solution tr...

Embodiment 2

[0042] The composition of the 304 stainless steel blank in this example is C: 0.075%, Si: 0.28%, Mn: 1.58%, Cr: 17.4%, Ni: 8.2%, Mo: 0.10%, Nb: 0.04%, V: 0.07%, The balance is Fe and other unavoidable impurities, and the total weight percentage of each component is 100%.

[0043]A kind of preparation method of high-strength plastic nano / submicron crystal cold-rolled 304 stainless steel strip of the present invention, comprises the following steps:

[0044] Step 1, forging and hot rolling:

[0045] The forged billet with a thickness of 60mm was placed in a heating furnace and heated to 1200°C with the furnace and held for 3 hours, and then rolled into a hot-rolled sheet with a thickness of 6mm on a hot rolling mill for 7 passes, and then cold rolled at 40°C / s. Quickly cool to room temperature. The rolling start temperature is 1160°C, the final rolling temperature is 1000°C, and the total hot rolling reduction is about 90%;

[0046] Step 2, solution treatment and cold rolling...

Embodiment 3

[0053] The composition of the 304 stainless steel blank in this example is C: 0.062%, Si: 0.38%, Mn: 1.57%, Cr: 17.2%, Ni: 8.5%, Mo: 0.09%, Nb: 0.01%, V: 0.02%, The balance is Fe and other unavoidable impurities, and the total weight percentage of each component is 100%.

[0054] A kind of preparation method of high-strength plastic nano / submicron crystal cold-rolled 304 stainless steel strip of the present invention, comprises the following steps:

[0055] Step 1, forging and hot rolling:

[0056] The forged billet with a thickness of 60 mm was placed in a heating furnace and heated to 1180 °C with the furnace and kept for 2 hours, and then rolled into a hot-rolled sheet with a thickness of 5 mm on a hot rolling mill for 7 passes, and then cold rolled at 35 °C / s. Quickly cool to room temperature. The starting rolling temperature is 1150°C, the final rolling temperature is 1010°C, and the total hot rolling reduction is about 92%;

[0057] Step 2, solution treatment and cold...

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Abstract

Disclosed are a high-strength-plasticity nano / submicron grain cold-rolled 304 stainless steel strip and a preparation method therefor, belonging to the field of manufacturing cold-rolled austenitic stainless steel strips. The stainless steel strip has the following chemical ingredients in weight percentages: C < 0.08%, Si < 0.80%, Mn < 2.0%, Cr 17%-20%, Ni 8%-10%, and the balance being Fe, trace microalloy elements Mo, Nb and V, and other inevitable impurities. In the present invention, by means of the integrated control of hot-rolling- and cold-rolling-annealing, a high-strength-plasticity nano / submicron grain cold-rolled 304 stainless steel strip finished product is obtained, wherein the microstructure of the finished product steel is a multiscale nano / submicron grain austenite structure composed of ultra-fine grains with a grain size of 150-500 nm and coarse recrystallized austenite grains, a part of which has a grain size of larger than 1 μm. The high-strength-plasticity nano / submicron grain cold-rolled 304 stainless steel strip has excellent strong plasticity matching, a yield strength of ≥ 800 MPa, a tensile strength of ≥ 900 MPa, a total elongation of ≥ 40 %, and a thickness specification covering 0.3-1 mm.

Description

technical field [0001] The invention belongs to the field of manufacturing cold-rolled austenitic stainless steel strips, in particular to a high-strength plastic nano / submicron crystal cold-rolled 304 stainless steel strip and a preparation method thereof. Background technique [0002] Austenitic stainless steel is widely used in civil, transportation, petrochemical, nuclear power, national defense, aerospace and other fields due to its non-magnetic properties, excellent corrosion resistance, high temperature oxidation resistance, easy welding, easy forming and good comprehensive mechanical properties. . Among them, 300 series austenitic stainless steel such as 304 and 301 are the most widely used austenitic stainless steel. As a typical metastable austenitic stainless steel, 304 and 301 stainless steel have good corrosion resistance, plasticity and toughness, and excellent high and low temperature mechanical properties; making this stainless steel the preferred structural...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/48C22C38/46C22C38/44C22C38/02C22C38/04C21D8/02C21D1/26C21D1/18
CPCC21D1/18C21D1/26C21D8/0205C21D8/0226C21D8/0236C21D2201/03C21D2211/001C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/58
Inventor 孙国胜杜林秀杜预张梅张彬吴红艳高秀华
Owner NORTHEASTERN UNIV LIAONING
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