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

High-intensity medium carbon nanometer constructional steel and preparation method thereof

A carbon nano-structure and high-strength technology, applied in the field of nano-structure steel, can solve the problems of unfavorable industrial production, cumbersome process and high equipment requirements, and achieve the effects of overcoming easy cracking, simple process and low cost.

Inactive Publication Date: 2013-06-26
WUHAN UNIV OF SCI & TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tisuji and others in Japan proposed a method for preparing low-carbon nano-steel through cold rolling and annealing martensite initial structure (N. Tsuji, R. Ueji, Y. Minamino, Y. Saito. A new and simple process to obtain nano -structured bulk low-carbon steel with superior mechanical property. Scripta Materialia 46 (2002) 305–310), obtained a low-carbon steel with an average grain size of 180~500nm (Fe-0.13C-0.37Mn-0.01Si, wt .%), its tensile strength is about 870MPa, and its elongation is only 8%. At present, this method can only be applied to low-carbon steel. At the same time, direct cold rolling of martensitic structure will easily lead to billet cracking, which is not conducive to industrial production.
Wang et al adopted the rolling method (T.S. Wang, Z. Li, B. Zhang, X.J. Zhang, J.M. Deng, F.C. Zhang. High tensile ductility and high strength in ultra?ne-grained low-carbon steel. Materials Science and Engineering A 527 (2010) 2798–2801), prepared a low-carbon nanostructure steel (Fe-0.12C-1.42Mn-0.24Si, wt.%), although the elongation basically meets the requirements, but the tensile strength is not high, and the rolling Cracking will also occur in the process of making low carbon martensite, and this method can only be applied to low carbon steel
The process of preparing nano-structured steel by rolling method is: high-temperature austenitization + quenching + cold-rolled martensite structure + annealing treatment. Although the nano-structured steel prepared by this process has high strength, it is directly cold-rolled martensite structure. Cracks are prone to appear on the surface of steel, especially for medium carbon steel, this shortcoming is more prominent
[0004] Domestic technicians have made great progress in the research of nano-structured steel, such as "Low-carbon steel with bulk nano-structure and its preparation method" (CN 201010613321.0), using compression equipment to impact low-carbon steel block blanks, making them in the range of 102~103 The high strain rate deformation in the range of / s causes the nanostructure of the microstructure to prepare a bulk nanostructured low carbon steel, but this technology can only be used for the preparation of relatively small bulk nanosteel, and the process is relatively complicated. The requirements for equipment are also relatively high, and it is only suitable for low carbon steel range
Another example is "a preparation method of nano-grain low-carbon micro-alloy steel" (CN 200510047742.0). This technology adopts multi-pass compression deformation to prepare micro-alloy steel. Structural steel is limited to low carbon steel range

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A high-strength medium-carbon nanostructure steel and a preparation method thereof. First place the medium carbon steel billet in a tube furnace, heat it to 850~900°C, keep it warm for 50~60 minutes, and pass CO and CO2 during the heat preservation process. 2 The mixed gas, CO:CO in the mixed gas 2 The volume ratio is 1:(3~4); then take out the steel billet and water quench it to room temperature, carry out cold rolling to the steel billet after water quenching, and finally carry out annealing treatment with the cold rolled steel plate under the condition of 450~550°C, the annealing time is 50 ~60 minutes.

[0019] The chemical composition and content of the medium carbon steel slab described in this embodiment are: C is 0.40~0.42wt%, Mn is 0.63~0.66wt%, Si is 1.58~1.63wt%, Cr is 0.65~0.70wt%, V is 0.03~0.05wt%, Al is 0.08~0.10wt%, Cu<0.05wt%, P<0.015wt%, S<0.010wt%, and the rest is Fe and unavoidable impurities.

[0020] The tensile strength of the high-strength med...

Embodiment 2

[0022] A high-strength medium-carbon nanostructure steel and a preparation method thereof. First place the medium carbon steel billet in a tube furnace, heat it to 870~920°C, keep it warm for 45~55 minutes, and pass CO and CO2 during the heat preservation process. 2 The mixed gas, CO:CO in the mixed gas 2 The volume ratio is 1:(4~5); then take out the steel billet and water quench it to room temperature, cold-roll the steel billet after water quenching, and finally carry out annealing treatment on the cold-rolled steel plate under the condition of 480~580°C, and the annealing time is 45 ~55 minutes.

[0023] The chemical composition and content of the medium carbon steel slab described in this embodiment are: C is 0.41~0.43wt%, Mn is 0.65~0.69wt%, Si is 1.60~1.66wt%, Cr is 0.67~0.75wt%, V is 0.03~0.05wt%, Al is 0.09~0.11wt%, Cu<0.05wt%, P<0.015wt%, S<0.010wt%, and the rest is Fe and unavoidable impurities.

[0024] The tensile strength of the high-strength medium-carbon nan...

Embodiment 3

[0026] A high-strength medium-carbon nanostructure steel and a preparation method thereof. First place the medium carbon steel billet in a tube furnace, heat it to 890~940°C, keep it warm for 35~50 minutes, and pass CO and CO2 during the heat preservation process. 2 The mixed gas, CO:CO in the mixed gas 2 The volume ratio is 1:(4.5~5.5); then take out the steel billet and water quench to room temperature, carry out cold rolling to the steel billet after water quenching, finally carry out annealing treatment under the condition of 510~610°C with the cold rolled steel plate, the annealing time is 35 ~50 minutes.

[0027] The chemical composition and content of the medium carbon steel slab described in this embodiment are: C is 0.42~0.44wt%, Mn is 0.67~0.71wt%, Si is 1.63~1.70wt%, Cr is 0.70~0.79wt%, V is 0.03~0.05wt%, Al is 0.10~0.12wt%, Cu<0.05wt%, P<0.015wt%, S<0.010wt%, and the rest is Fe and unavoidable impurities.

[0028] The tensile strength of the high-strength medium...

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

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention specifically relates to high-intensity medium carbon nanometer constructional steel and a preparation method thereof. The technical scheme of the invention is as follows: the preparation method comprises the steps of: firstly, putting a medium-carbon steel billet in a tubular furnace; heating the steel billet to 850-950 DEG C; preserving the temperature for 30-60 minutes; inhaling a mixed gas of CO and CO2 during temperature preservation, wherein the volume ratio of CO to CO2 in the mixed gas is 1:(3-6); then taking the steel billet and quenching the steel billet to room temperature by water; and carrying out cold rolling on the water-quenched steel billet, and at last annealing the cold-rolled steel plate at 450-650 DEG C for 30-60 minutes. The medium-carbon steel billet comprises the following chemical components: 0.4wt%-0.45wt% of C, 0.63wt%-0.74wt% of Mn, 1.58wt%-1.73wt% of Si, 0.65wt%-0.82wt% of Cr, 0.03wt%-0.05wt% of V, 0.08wt%-0.12wt% of Al, less than 0.05wt% of Cu, less than 0.015wt% of P, less than 0.010wt% of S, and the balance of Fe and inevitable impurities. The method disclosed by the invention is simple in process, low in cost, and easy for industrial production, and the prepared medium carbon nanometer constructional steel has excellent mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of nanostructure steel. In particular, it relates to a high-strength medium-carbon nanostructure steel and a preparation method thereof. technical background [0002] With rising raw material prices and increasing requirements for energy conservation and emission reduction, the iron and steel industry is paying more and more attention to the research and development of high-strength plastic-laminated steel, among which nanostructured steel is one of the research hotspots. The strength of nanostructured steel is usually several times higher than that of corresponding coarse-grained steel, which has broad application prospects and is also in line with the current development trend of low-carbon emissions. [0003] The methods for preparing bulk nano-metals include crystallization of amorphous materials, rapid solidification, high-energy mechanical grinding, large plastic deformation, high-energy particle irra...

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 Applications(China)
IPC IPC(8): C22C38/34C21D8/02
Inventor 徐光胡海江刘峰薛正良张云祥
Owner WUHAN UNIV OF SCI & TECH