Unlock instant, AI-driven research and patent intelligence for your innovation.

Austenitic stainless steel plate with excellent strength at medium and low temperature and manufacturing method thereof

A technology of austenitic stainless steel and low-temperature strength, which is applied in the field of austenitic stainless steel plate and its manufacturing, can solve the problems of material manufacturing difficulty and raw material cost increase, and achieve good strength, good corrosion resistance, good plastic toughness and durability erosive effect

Active Publication Date: 2013-01-02
BAOSTEEL DESHENG STAINLESS STEEL
View PDF3 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the addition of these alloying elements can also improve the mechanical properties at medium and low temperatures, it will cause a significant increase in the difficulty of manufacturing the material and the cost of raw materials, and the method used to improve the strength of the material is different from the content of the invention

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Austenitic stainless steel plate with excellent strength at medium and low temperature and manufacturing method thereof
  • Austenitic stainless steel plate with excellent strength at medium and low temperature and manufacturing method thereof
  • Austenitic stainless steel plate with excellent strength at medium and low temperature and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] According to the composition of the austenitic stainless steel described in the present invention, see Table 1, using electric furnace + AOD smelting, pouring into 200mm thick continuous casting slab, heating at 1250°C, holding for 240min, and rolling, the process parameters are mainly: rolling start temperature 1230°C, the final rolling temperature is 1025°C, the thickness of the coil is 5mm, after rolling, it is cooled at 25°C / min to 670°C for coiling, and then annealed after air cooling to room temperature. The annealing temperature is 1010°C, the time in the furnace is 3.5min, water cooling to 50°C, 2.5% pre-stretching, and then pickling.

[0049] For comparison, the current 316L was also smelted without adding rare earth, boron and niobium alloys. The starting rolling temperature is 1240°C, the final rolling temperature is 1000°C, the annealing temperature is 1100°C, and then pickled. For comparison, a furnace of austenitic stainless steel similar in composition t...

Embodiment 2

[0056] According to the composition of the austenitic stainless steel described in the present invention, see Table 1, using electric furnace + AOD + VOD smelting, pouring into 200mm thick continuous casting slab, heating at 1240 ℃, holding for 270min, rolling, the process parameters are mainly: The rolling temperature is 1210°C, the final rolling temperature is 1010°C, and the coil thickness is 6mm. After rolling, it is cooled at 23°C / min to 660°C for coiling, and then annealed after air cooling to room temperature. The annealing temperature is 1030°C, the time in the furnace is 4.5min, water cooling to 55°C, 3.5% pre-stretching, and then pickling.

[0057] Comparing Table 1 and Table 2, it can be seen that the austenitic stainless steel coil produced in this example (see Table 3) has fine grains in the range of 20-350°C, and its mechanical properties are significantly higher than those of the comparative example 316L, elongation Its corrosion resistance is comparable to that...

Embodiment 3

[0062] According to the composition of the austenitic stainless steel according to the present invention, see Table 1. It is smelted by electric furnace + AOD + VOD, poured into a 200mm thick continuous casting slab, heated at 1255°C, kept for 230min, and rolled. The process parameters are mainly: The rolling temperature is 1220°C, the final rolling temperature is 1035°C, and the coil thickness is 8mm. After rolling, it is cooled at 29°C / min to 680°C for coiling, and then annealed after air cooling to room temperature. The annealing temperature is 1040°C, the time in the furnace is 6min, water cooling to 45°C, 0.5% pre-stretching, and then pickling.

[0063] Comparing Table 1 and Table 2, it can be seen that the mechanical properties of the austenitic stainless steel coil produced in this example (see Table 4) are significantly higher than those of the comparative example 316L in the range of 20-350 °C, elongation and corrosion resistance Comparable to 316L.

[0064] Table 4 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to an austenitic stainless steel plate with excellent strength at the medium and low temperature and a manufacturing method thereof. Based on the common 316 L, less than 0.30 percent of niobium (Nb), less than 0.30 percent of one of or a mixture of cerium (Ce), dysprosium (Dy), yttrium (Y) and neodymium (Nd) and 0.0015 to 0.0040 percent of boron (B) are added; elements such as nickel (Ni), manganese (Mn), carbon (C), nitrogen (N), chromium (Cr), molybdenum (Mo) and silicon (Si) are formed by adjusting the equivalent weight of nickel-chromium; and the high temperature ferrite content delta in austenitic stainless steel cast condition is less than 2 percent. The manufacturing method comprises the following steps of: 1) smelting and casting; 2) performing hot rolling, cooling to a reeling temperature at the speed of 20 to 40 DEG C / s and performing air cooling to the room temperature, wherein the heating temperature is between 1,220 and 1,270 DEG C and the finish rolling temperature is more than 1,010 DEG C; 3) annealing, wherein the annealing temperature is between 850 and 1,050 DEG C; 4) performing water cooling to the temperature of between 40 and 100 DEG C after annealing and performing pre-tensioning deformation at the temperature of between 40 and 100 DEG C; and 5) performing acid washing. The manufacturing process is simple and can be applied in the fields of chemical industry, energy sources, pressure containers and the like with higher requirement on the strength of the austenitic stainless steel.

Description

technical field [0001] The invention relates to a method for preparing stainless steel, in particular to an austenitic stainless steel plate with excellent medium and low temperature strength and a method for manufacturing the same. The stainless steel can be used in an environment of 20-350°C. Due to its excellent medium and low temperature strength, it can replace the existing materials used, so as to achieve the purpose of reducing the weight of the material. Background technique [0002] 18-8 series austenitic stainless steel is widely used in petroleum, chemical industry, aerospace and energy fields due to its good ductility, cold and hot workability and local corrosion resistance at high and very low temperatures. These fields require The working temperature of the material can reach as low as -196°C and as high as 600-700°C. With the shortage of energy and the intensification of market competition, more and more industries require lighter and larger equipment, which...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54C22C38/58C21D8/00C21D1/26C23G1/02
Inventor 淮凯文陈旭
Owner BAOSTEEL DESHENG STAINLESS STEEL