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Austenitic stainless steel medium-thick plate and manufacture method thereof

A technology of austenitic stainless steel and manufacturing method, applied in the direction of metal rolling, etc., can solve the problems of increasing the manufacturing cost of austenitic stainless steel, limiting product specifications and sizes, not suitable for mass production, etc., and achieving high plasticity, yield strength and The effect of increased resistance strength and good strength

Active Publication Date: 2010-06-09
BAOSTEEL DESHENG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The process disclosed in the patent CA1587422A is to deform the austenitic stainless steel through the equal-diameter angular extrusion process at room temperature, and then undergo an annealing heat treatment at 800-1000 ° C to obtain ultra-fine grain steel, which significantly improves the austenitic stainless steel. Strength, but because of the cold working process, although the grains of austenitic stainless steel can be refined and its strength can be improved, but the manufacturing cost of austenitic stainless steel is increased, the specification and size of the product are limited, and it is not suitable for large-scale production. Difficult to produce high strength austenitic stainless steel plate

Method used

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  • Austenitic stainless steel medium-thick plate and manufacture method thereof
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  • Austenitic stainless steel medium-thick plate and manufacture method thereof

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Embodiment 1

[0048]According to the composition of the austenitic stainless steel described in the present invention, it is smelted by electric furnace + AOD, poured into a continuous casting slab, and then rolled after being heated and kept at 1270°C. Rolling at 1120°C for 5 passes, the deformations of each pass were 31%, 19%, 22%, 20%, and 16%, and then water cooled to 910°C at 22°C / s, and then rolled for 4 passes. The secondary deformations are 22%, 15%, 10%, and 5%, respectively, the final rolling temperature is 770°C, water cooled to room temperature, the final plate thickness is 33mm, annealed and pickled at 1000°C. For comparison, 304 and 316LN, which are commonly used at present, were also smelted. The composition is shown in Table 1, and hot-rolled and annealed using conventional processes. The hot-rolling temperature range is 1250-1020 ° C, and the annealing temperature is 1080 ° C. It can be seen from Table 2 that the yield strength of the austenitic stainless steel plate produc...

Embodiment 2

[0050] The composition of the implemented steel is the same as that of Example 1. It is smelted in an electric furnace + AOD, poured into a continuous casting slab, and then rolled after heating and heat preservation at 1270°C. The rolling process parameters are mainly: the starting rolling temperature is 1235°C, and the finishing rolling temperature is Rolling at 1080°C for 6 passes, the deformation of each pass is 35%, 20%, 26%, 20%, 16%, and 15%, then water cooling to 870°C at 25°C / s, and then rolling for 3 passes The deformation of each pass is 25%, 11%, and 6%, respectively, the final rolling temperature is 750°C, water cooled to room temperature, and the plate thickness is 27.6mm. Finally, the plate is annealed and pickled at 980°C. The yield strength of the austenitic stainless steel plate produced in Example 2 is 120 MPa higher than that of the conventional steel type 316LN medium plate, and the tensile strength is 120 MPa higher, and has good plasticity, toughness and...

Embodiment 3

[0052] The composition of the implemented steel is the same as that of Example 1. It is smelted in an electric furnace + AOD, and cast into a continuous casting slab. After heating and heat preservation at 1270°C, it is rolled. The process parameters are: the starting rolling temperature is 1235°C, and the final rolling temperature is 1080°C. , rolled for 7 passes, and the deformations of each pass were 33%, 25%, 26%, 23%, 20%, and 15%, and then water cooled to 850°C at 28°C / s, and then rolled for 4 passes. The deformations of each pass were 25%, 11%, 9%, and 5%, respectively, the final plate thickness was 22mm, and the final rolling temperature was 780°C. Finally, the plate is annealed and pickled at 900°C. The yield strength of the austenitic stainless steel plate produced in Example 3 is 140MPa higher than that of the conventional steel type 316LN medium plate, and the tensile strength is 135MPa higher, and has good plasticity, toughness and corrosion resistance.

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Abstract

The invention relates to an austenitic stainless steel medium-thick plate which comprises the following components in percentage by weight: no more than 0.04 percent of C, 0.3-0.9 percent of Si, 1-2 percent of Mn, no more than 0.010 percent of S, no more than 0.04 percent of P, 16-22 percent of Cr, 8-14 percent of Ni, no more than 4 percent of Mo, 0.04-0.30 percent of N, 0.0010-0.0030 percent of B, smaller than 0.30 percent of one or more rare-earth elements, such as Ce, Dy, Y and Nd, 1-10 percent of high-temperature ferrite delta and the balance of ferrum and unavoidable impurities. The manufacture method of the austenitic stainless steel medium-thick plate comprises the following steps of: smelting; hot rolling; heating and preserving the temperature of the alloy and then carrying out 4-10 passes of rolling in a recrystallization area at 1,250-1,050 DEG C; water-cooling the recrystallization area by 20-40 DEG C / s to 700-950 DEG C, rolling 3-5 rounds in the temperature interval and water-cooling to room temperature; carrying out low-temperature annealing heat treatment at 900-1,050 DEG C; washing with acid and then obtaining the austenitic stainless steel medium-thick plate with excellent strength.

Description

technical field [0001] The invention relates to the field of stainless steel production, in particular to an austenitic stainless steel plate with excellent strength and a manufacturing method thereof. Background technique [0002] 18-8 series austenitic stainless steel (304, 304L, 316L, etc.) are widely used in petroleum, chemical, and pressure vessels due to their good plasticity, toughness, cold and hot workability, and good corrosion resistance at high and low temperatures. , aerospace and energy fields. With the shortage of energy and the intensification of market competition, more and more industries require lighter and larger equipment, which puts forward more requirements for the strength of stainless steel. The demand in this application area is mainly austenitic stainless steel plate. [0003] The main ways to improve the strength without significantly changing the plasticity and corrosion resistance of austenitic stainless steel are: nitrogen alloying and refini...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/54C21D8/02B21B1/46
Inventor 淮凯文余式昌
Owner BAOSTEEL DESHENG STAINLESS STEEL
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