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Nb containing low-carbon low-alloyed steel with ultra-fine ferrite grain structure and method for producing same

A low-alloy steel and a manufacturing method technology, which is applied in the manufacturing field of Nb-containing low-carbon low-alloy steel with ferrite grains refined to less than 3.0 μm, can solve the problem of phase transformation/recrystallization uneven structure, uneven structure, High rolling mill load and other problems, to achieve the effect of eliminating the inhomogeneity of the structure, simple production control, and reducing the rolling mill load

Inactive Publication Date: 2005-01-19
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such a high pass reduction rate and low deformation temperature will result in huge deformation resistance and extremely high rolling mill load, which is difficult to achieve in actual production; secondly, the unevenness of deformation under a high pass will lead to the final The inhomogeneity of the phase transformation / recrystallization structure, in the parts where the deformation is concentrated, such as the deformation belt entangled with high-density dislocations, the original austenite grain boundary area with high strain concentration, and the deformation twin belt, it is easy to induce phase transformation through strain / Recrystallization forms ultra-fine grains, while the grain size in other parts is relatively large (5 μm ~ 10 μm), resulting in inhomogeneity of the structure, so it is more difficult to realize large-scale test pieces in industrial production

Method used

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  • Nb containing low-carbon low-alloyed steel with ultra-fine ferrite grain structure and method for producing same
  • Nb containing low-carbon low-alloyed steel with ultra-fine ferrite grain structure and method for producing same
  • Nb containing low-carbon low-alloyed steel with ultra-fine ferrite grain structure and method for producing same

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Embodiment Construction

[0040] See Table 1 for Examples A to E of the Nb-containing low-carbon low-alloy steel of the present invention with ultrafine ferrite grains.

[0041] see you again image 3 , Figure 4 , The manufacturing process of ultra-fine grain steel plate is as follows: laboratory vacuum induction furnace smelting, after the liquid steel composition reaches the target composition, immediately start casting, the casting temperature of molten steel is 1560 ℃ ~ 1580 ℃. The steel ingot was forged at 1150°C into a 70mm thick billet for simulated hot rolling. The hot rolling was simulated by a Gleeble 1500 thermal simulator to simulate the actual rolling process. The heating rate of the billet was controlled between 15°C / s and 30°C / s. Between 1000°C and 1050°C, keep it warm for 5min (t1) to make the billet completely austenitized, then cool it to 800°C to 850°C at a cooling rate of 10°C / s to 30°C / s, and then carry out controlled rolling , the cumulative reduction rate is controlled between...

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Abstract

The invention discloses an Nb containing low-carbon low-alloyed steel with ultra-fine ferrite grain structure which comprises (by weight percentage) C 0.02%-0.20%, Nb 0.01%-0.10%, Si<0.80%, Ti 0.007%-0.025%, N 0.0035%-0.0083%, balancing Fe and unavoidable impurities. The invention also discloses its preparation method.

Description

technical field [0001] The invention relates to a method for manufacturing low-carbon and low-alloy steel, in particular to a method for manufacturing Nb-containing low-carbon and low-alloy steel whose ferrite grains are refined to less than 3.0 μm. Background technique [0002] As we all know, low-carbon (high-strength) low-alloy steel is one of the most important engineering structural materials, widely used in oil and gas pipelines, offshore platforms, shipbuilding, bridges, pressure vessels, building structures, automobile industry, railway transportation and machinery manufacturing . The properties of low-carbon (high-strength) low-alloy steel depend on its chemical composition and the process system of the manufacturing process, among which strength, toughness and weldability are the most important properties of low-carbon (high-strength) low-alloy steel, which are ultimately determined by the finished steel state of the microstructure. Refining ferrite grain size is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/04C22C38/12C22C38/14
Inventor 刘自成陈超丁建华张备
Owner BAOSHAN IRON & STEEL CO LTD
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