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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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...
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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.

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

Examples

  • Experimental program(5)

Example Embodiment

[0047] Example 1
[0048] According to the composition of the austenitic stainless steel of the present invention, it is smelted by an electric furnace + AOD, poured into a continuous casting billet, heated at 1270°C for heat preservation, and then rolled. The main process parameters are: the opening temperature of 1240°C, and the final rolling temperature of 1120℃, rolling 5 passes, the deformation of each pass is 31%, 19%, 22%, 20%, 16%, and then water-cooled at 22℃/s to 910℃, and then 4 passes are rolled. The secondary deformation is 22%, 15%, 10%, 5%, the final rolling temperature is 770°C, water cooled to room temperature, and the final sheet thickness is 33mm, and the plate is annealed and pickled at 1000°C. For comparison, the current commonly used 304 and 316LN are also smelted. The composition is shown in Table 1. The hot rolling and annealing are carried out using conventional processes. The hot rolling temperature range is 1250~1020℃, and the annealing temperature is 1080℃. It can be seen from Table 2 that the yield strength of the austenitic stainless steel medium-thick plate manufactured in Example 1 is 115MPa higher than the conventional steel grade 316LN medium-thick plate, the tensile strength is increased by 105MPa, and it has good plastic toughness and corrosion resistance. performance.

Example Embodiment

[0049] Example 2
[0050] The composition of the implemented steel grade is the same as that of Example 1. It uses electric furnace + AOD smelting and casts into a continuous casting billet. After heating and holding at 1270°C, it is rolled. The main rolling process parameters are: the opening temperature of 1235°C, and the final rolling temperature of 1080 ℃, 6 passes, the deformation of the pass is 35%, 20%, 26%, 20%, 16%, 15%, and then water cooling at 25 ℃/s to 870 ℃, and then 3 passes The deflection of each pass is 25%, 11%, 6%, 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 medium-thick plate manufactured in Example 2 is 120 MPa higher than that of the conventional steel grade 316LN medium-thick plate, the tensile strength is increased by 120 MPa, and it has good plastic toughness and corrosion resistance.

Example Embodiment

[0051] Example 3
[0052] The composition of the implemented steel grade is the same as that of Example 1. It uses electric furnace + AOD smelting, and casts into a continuous casting billet. After heating and holding at 1270°C, it is rolled. The process parameters are: the opening temperature of 1235°C, and the final rolling temperature of 1080°C. , Rolling 7 passes, the deformation of each pass is 33%, 25%, 26%, 23%, 20%, 15%, and then water-cooled to 850°C at 28°C/s, and then rolling 4 passes, The pass deformation is 25%, 11%, 9%, 5%, the final plate thickness is 22mm, and the final rolling temperature is 780°C. Finally, the plate is annealed and pickled at 900°C. The yield strength of the austenitic stainless steel medium-thick plate manufactured in Example 3 is 140 MPa higher than the conventional steel grade 316LN medium-thick plate, the tensile strength is increased by 135 MPa, and it has good plastic toughness and corrosion resistance.
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