Niobium microalloyed steel for low-temperature reinforcing steel bar and rolling process of steel

A technology of micro-alloying and low-temperature steel bars, which is applied in the direction of temperature control, etc., to achieve the effect of low nickel content and good low-temperature resistance of steel types

Active Publication Date: 2013-08-14
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] None of the above 4 types of low-temperature steel can be used in low-t

Method used

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  • Niobium microalloyed steel for low-temperature reinforcing steel bar and rolling process of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The chemical composition ratio of the niobium microalloyed steel for low-temperature reinforcement is: C: 0.10%, Si: 0.35%, Mn: 1.58%, P: 0.007%, S: 0.006%, Ni: 0.55% , Cu: 0.75%, Nb: 0.027%, and the rest are Fe and impurity elements.

[0032] Taking a steel billet with a diameter of φ12mm as an example, the rolling process of the low-temperature steel bar with a diameter of φ12mm is based on the above composition range, smelted in an electric arc furnace, refined outside the furnace, continuously cast, and then rolled on a continuous bar rolling mill forming.

[0033] The rolling process parameters of the niobium microalloyed low-temperature steel bars are: billet heating temperature 1181-1205°C, starting rolling temperature 980-1002°C, finishing rolling temperature 956-972°C, water cooling after rolling, upper cooling bed temperature 610-620°C ℃, steel bars are bundled and stacked after natural cooling on the cooling bed.

Embodiment 2

[0035] The chemical composition ratio of the niobium microalloyed steel for low temperature steel bars is: C: 0.11%, Si: 0.33%, Mn: 1.48%, P: 0.008%, S: 0.005%, Ni: 0.88% , Cu: 0.16%, Nb: 0.028%, and the rest are Fe and impurity elements.

[0036] Taking a steel billet with a diameter of φ16mm as an example, the rolling process of the low-temperature steel bar with a diameter of φ16mm is based on the above composition range, smelting in a converter and refining outside the furnace, continuous casting, and rolling on a continuous bar rolling mill. .

[0037] The rolling process parameters of the niobium microalloyed low-temperature steel bars are: billet heating temperature 1210-1230°C, starting rolling temperature 1023-1033°C, finishing rolling temperature 1010-1027°C, water cooling after rolling, upper cooling bed temperature 550-575°C ℃, steel bars are bundled and stacked after natural cooling on the cooling bed.

Embodiment 3

[0039] The chemical composition ratio of the niobium microalloyed steel for low temperature steel bars is: C: 0.12%, Si: 0.18%, Mn: 1.51%, P: 0.009%, S: 0.007%, Ni: 0.90% , Cu: 0.12%, Nb: 0.033%, and the rest are Fe and impurity elements.

[0040] Taking a steel billet with a diameter of φ20mm as an example, the rolling process of the low-temperature steel bar with a diameter of φ20mm is based on the above composition range, smelted in an electric arc furnace, refined outside the furnace, continuously cast, and then rolled on a continuous bar rolling mill forming.

[0041]The rolling process parameters of the niobium microalloyed low-temperature steel bar are: billet heating temperature 1220-1240°C, starting rolling temperature 1020-1040°C, final rolling temperature 1026-1036°C, water cooling after rolling, upper cooling bed temperature 597-618 ℃, steel bars are bundled and stacked after natural cooling on the cooling bed.

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Abstract

The invention discloses niobium microalloyed steel for a low-temperature reinforcing steel bar and a rolling process of the steel. The steel for the low-temperature reinforcing steel bar comprises the following chemical components in percentage by weight: 0.05 to 0.15 percent of C, 0.15 to 0.40 percent of Si, 1.40 to 1.60 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, 0.50 to 2.00 percent of Ni, 0.10 to 0.80 percent of Cu, 0.015 to 0.050 percent of Nb and the balance of Fe and impurity elements. The rolling process of the steel for the low-temperature reinforcing steel bar comprises the following steps of: smelting steel in a converter, an electric-arc furnace or other smelting furnaces; performing external refining; performing continuous casting; rolling and forming on a continuous bar mill, wherein the parameters of the rolling process are as follows: steel billets are heated to 1,180 to 1,250 DEG C, the initial rolling temperature is 950 to 1,050 DEG C, and the finishing rolling temperature is 950 to 1,100 DEG C; and performing water passing and cooling after rolling, wherein the cooling bed feeding temperature is 500 to 650 DEG C. According to the steel for the low-temperature reinforcing steel bar and the low-temperature reinforcing steel bar products produced by the rolling process of the steel, low-temperature building engineering reinforced concrete structures such as LNG and the like can resist the low temperature of -165 DEG C, and the steel for the low-temperature reinforcing steel bar has good low-temperature resistance and is safe and reliable.

Description

technical field [0001] The invention relates to a steel for low-temperature reinforcement and a rolling process thereof, in particular to a niobium microalloyed steel for low-temperature reinforcement and a rolling process thereof. Background technique [0002] The hot-rolled ribbed steel bar is the skeleton material of the concrete structure. It bears various stresses in the structure and is sometimes used in a certain low temperature environment. Therefore, not only the steel bar is required to have high strength and process performance, but also high The functionality - the ability to resist low temperature. [0003] A typical example that requires the use of low-temperature steel bars is the low-temperature-resistant steel bars used in the construction of liquefied natural gas storage tanks (LNG for short) in the petrochemical industry. The basic requirements are: [0004] (1) High strength, yield strength ≥ 400MPa or ≥ 500MPa; [0005] (2) The production process is no...

Claims

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Application Information

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IPC IPC(8): C22C38/16B21B37/74
Inventor 孙维完颜卫国郭湛汪开忠
Owner MAGANG (GROUP) HOLDING CO LTD
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