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Low-temperature high-product-of-strength-and-elongation high manganese steel plate and processing technology thereof

A technology of high-strength plastic product and processing technology, applied in the field of low-temperature high-strength plastic-product high-manganese steel plate and its processing technology, can solve the problems of insurmountable technology and economy, low low temperature strength, high price, etc., and achieves simple processing technology, low cost, The effect of simple ingredients

Active Publication Date: 2015-08-19
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is widely used in low-temperature steel materials, mainly low-carbon martensitic low-temperature steel, mainly 3.5%Ni, 5%Ni and 9%Ni steel. Although the performance of this type of steel plate can meet the requirements, it contains high nickel. The price is expensive; the other type is austenitic low-temperature steel, mainly including AISI304, 304LN, 316, 316LN and 310 steel types, and its chemical composition can be seen in Table 1. This type of steel type has low low-temperature strength, although 304LN and 316LN are used Nitrogen strengthening can improve low temperature strength to a certain extent, but this kind of steel is prone to martensitic transformation at low temperature, resulting in magnetism and stress
Therefore, the above two types of steels have insurmountable shortcomings both technically and economically.

Method used

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  • Low-temperature high-product-of-strength-and-elongation high manganese steel plate and processing technology thereof
  • Low-temperature high-product-of-strength-and-elongation high manganese steel plate and processing technology thereof
  • Low-temperature high-product-of-strength-and-elongation high manganese steel plate and processing technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The composition of the high manganese steel described in this example is calculated by weight percentage: Mn 34%, C 0.04%, S≤0.01%, P≤0.008%, and the rest is Fe and unavoidable impurities. The content of sulfur and phosphorus is restrictive. The specific processing steps are:

[0040] A. According to the above-mentioned component distribution ratio of high manganese steel, calculate the feeding ratio, melt the ingredients in a power frequency electric induction furnace, and smelt the ingredients into steel ingots in a positive argon pressure environment in the furnace to prevent Mn from volatilizing during the smelting process.

[0041] B. Post-treatment of steel ingots: keep the steel ingots in step A for heat treatment at 1150°C~1200°C for 2~4 hours, then transfer to room temperature, and homogeneously complete solution treatment in a water quenching pool; after solution treatment, The full dissolution of each phase in the ingot is conducive to improving the toughnes...

Embodiment 2

[0049] On the basis of Example 1, step D is also included: hot rolling, and then cold rolling the homogenized rough plate, annealing and homogeneous forming.

[0050] The cold-rolling conditions are: hot-rolled and homogenized raw plates are cold-rolled at room temperature for 10-20 passes to a steel plate with a thickness of 1mm-2.0mm, and the rolling deformation is 90%-92%. The sample is subjected to XRD Test, its XRD figure see figure 2 .

[0051] Annealing and homogeneous forming: the cold-rolled sample was annealed at 600°C for 1 hour, and then transferred to room temperature and water quenching pool to complete annealing and homogenization to obtain a high-manganese steel plate, and then the above-mentioned high-manganese steel plate was subjected to XRD and EBSD (electronic background Scattering pattern) test, see respectively image 3 with Figure 5 .

[0052] from figure 2 It can be seen that the cold-rolled steel plate is an austenite structure with a complete...

Embodiment 3

[0056] The difference from Example 2 is that the cold-rolled steel plate is annealed at 700° C. for 1 hour, and then transferred to room temperature and quenched in water to complete the annealing homogeneity to obtain a high-manganese steel plate. Then, the above-mentioned high-manganese steel plate is subjected to EBSD ( Electron backscatter pattern) test, see Figure 8 , tensile experiments were carried out at -180°C, and the engineering stress-engineering strain curves and true stress-true strain curves are respectively shown in Figure 12 with Figure 13 , XRD test at the parallel end of the fracture and SEM test at the fracture after being pulled off, the results can be found in Figure 9~11 .

[0057] The above results show that after annealing at 700°C for 1 hour, the average grain size of the steel plate is 2.5 μm; after breaking at -180°C, it is still austenite with a complete face-centered cubic structure, no phase transformation occurs, and no strain / stress induc...

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Abstract

The invention discloses a processing method of a low-temperature plastic high manganese steel plate. The processing method comprises the processing steps of high manganese steel smelting, steel ingot post-processing, and plate forming by cogging and rolling. The concrete steps are as follows: A. high manganese steel smelting: a material formula includes the following ingredients in percentage by weight: 30-36 percent of Mn, 0.02-0.06 percent of C, 0-0.01 percent of S and 0-0.008 percent of P, the balance being Fe; B. steel ingot post-processing: a high manganese steel ingot formed by smelting is heat-treated for 2-4 hours at a temperature of 1,150-1,200 DEG C, and then transferred to a room-temperature water quenching pool to be homogenized to be subjected to solution treatment; C. plate forming by cogging and rolling: after solution treatment, the high manganese steel ingot is cogged, and then is hot-rolled and tempered to be homogenized. When being stretched and deformed at a low temperature (for example -180 DEG C), the low-temperature plastic high manganese steel plate has the characteristics of typical brittle fracture (i.e. intergranular fracture), but the low-temperature plastic high manganese steel plate has uniform elongation percentage above 18% and higher yield strength and tensile strength, so that the low-temperature plastic high manganese steel plate is suitable for low-temperature environments such as low-temperature pressure vessels.

Description

technical field [0001] The invention belongs to the field of iron and steel materials and their processing and preparation, and in particular relates to a low-temperature, high-strength, high-manganese steel plate and its processing technology. Background technique [0002] As we all know, the low temperature brittle fracture of steel is one of the most dangerous failure forms of steel structures. Steel has brittle fracture phenomenon at low temperature. Generally speaking, steel materials have the following characteristics when brittle fracture occurs: (1) The working stress is lower than the yield limit; (2) Once brittle fracture occurs, it will expand at a very high speed (above 2000 m / s); (3) The fracture is straight, the reduction rate of the section is small, and there is no obvious macroscopic deformation feature in appearance ; (4) The fracture morphology is mostly intergranular fracture. Once brittle failure occurs, it will cause heavy losses. For example, in World...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/04
Inventor 王玉辉黄晓旭王天生彭艳贺延明郑亚楠廖波
Owner YANSHAN UNIV
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