Niobium titanium -combined microalloying steel for cooling-control reinforced bar and method for producing same

A technology of microalloying and production methods, applied in temperature control, metal rolling, etc., to achieve good performance and benefit the rational and balanced application of resources

Active Publication Date: 2007-04-25
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects existing in the prior art, the object of the present invention is to provide a kind of niobium-titanium composite microalloying controlled cooling reinforcement steel and its production method, through niobium-titanium composite microalloying and controlled cooling to ensure the strength performance of the steel bar, To solve the problem of industrial production of large-scale niobium microalloyed 400MPa steel bars

Method used

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Embodiment Construction

[0012] The present invention is further illustrated by the following examples. The embodiment adopts the conventional smelting method, according to the elements and contents specified by each specification in Table 1, smelting and continuous casting into a 150mm billet in a converter; adopts a general continuous bar rolling mill, controls the heating temperature of the billet to 1050-1250 ℃, and rolls it at a temperature above 950 ℃. system completed. Controlled cooling, rapid water-cooling cooling of steel bars after rolling, control the temperature of the upper cooling bed in the range of 800-1050 ° C, and then natural cooling, shearing, bundling, and storage. Its process parameters and properties are listed in Table 2.

[0013] The relative amount of the steel bar sample was measured by the truncation method, and no less than 50 response fields were measured under a 100-fold full-phase microscope. The relative amount of the structure of the steel bar samples is shown in T...

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Abstract

Steel with micro amount of Niobium-titanium combination used for controlled cooling steel and its production methods, belongs to the hot rolling steel used in ferroconcrete, especially steel rod with micro-niobium-titanium combination and its production method. The steel rod contains the following elements: (by wt. ratio): 0.15-0.25%C, 0.30-0.80%Si, 1.00-1.60%Mn, <=0.045%P, S, 0.005-0.02%Nb,<=0.0080%N, Fe as the rest and impurities elements. The production method of the steel rod contains the following steps: smelting, according to the specified elements and content, with conventional smelting method in a revolver or an electric furnace, rolling with a merchant bar mill, at temperature 1050-1220DEG C, rolling at a temperature over 950DEG C, rapidly cooling at a temperature of 800-1050DEG C, shearing, bundling, and warehousing after natural cooling. Through combination of micro niobium-titanium and proper cooling controlled, the steel rod has good properties. The method of the invention solves the problems low steel intensity at 400Mpa during macroallaying of niobium and safe production.

Description

Technical field: [0001] The invention belongs to a hot-rolled steel bar for reinforced concrete and a production method thereof, in particular to a steel bar containing a trace amount of niobium and titanium and a production method thereof. Background technique: [0002] At present, the hot-rolled ribbed steel bar for reinforced concrete with a yield strength of 400MPa is mainly produced by the microalloying process of ferrovanadium or vanadium-nitrogen alloy. Significant increase, resulting in tight supply of vanadium resources, prices rose sharply. [0003] In order to utilize resources reasonably and in a balanced manner, it is a better choice to use niobium microalloying technology to produce 400MPa grade steel bars. The Chinese national standard GB1499-1998 recommends the chemical composition of a niobium microalloyed 400MPa grade steel bar: 0.17-0.25% C, 0.20-0.80% Si, 1.20-1.60% Mn, ≤ 0.045% P, S, 0.02-0.04 %Nb, but when the niobium microalloying technology is used ...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C33/04C21D8/06B21B1/46B21B37/74
Inventor 完卫国许健华刚陈开智胡孝三孙维苏世怀
Owner MAANSHAN IRON & STEEL CO LTD
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