Low-temperature-resistant H-shaped steel and production process thereof

A production process, the technology of H-shaped steel, applied in the field of low-temperature resistant H-shaped steel and its production technology, can solve the problems of poor low-temperature impact resistance, low-temperature toughness, and low toughness of H-shaped steel, so as to achieve good low-temperature impact resistance and improve quality , the effect of low ductile-brittle transition temperature

Active Publication Date: 2014-09-03
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The ductile-brittle transition temperature of the current H-shaped steel is about -10°C. If the H-shaped steel is used in the alpine region and low temperature environment, it is prone to brittle fracture when subjected to dynamic load or impact, causing unnecessary losses.
[0003] Especially for H-shaped steel in the environment of -40°C and below, the toughness of the H-shaped steel is low, and the impact resistance at low temperature is poor, which cannot meet the requirements of use.
[0004] For example, the Chinese invention patent with the publication number CN102618781A discloses a hot-rolled H-shaped steel for low-temperature-resistant structures and its preparation method. It strengthens the composition control of the shaped billet through the smelting process, but its low-temperature toughness at -20 ° C has only reached Average 90J

Method used

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  • Low-temperature-resistant H-shaped steel and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1, the low temperature resistant H-shaped steel has the following chemical components in mass percentage: carbon: 0.10%, silicon: 0.23%, manganese: 1.41%, phosphorus: 0.006%, sulfur: 0.003%, vanadium: 0.036%, Als : 0.021%, the balance is iron and impurity elements.

[0015] The steel undergoes molten iron pretreatment→converter smelting→argon blowing in ladle→LF refining→full-protection casting of shaped blanks→H-shaped steel wire rolling, and finally the rolled piece is cooled. Among them, H-shaped steel wire rolling includes rough rolling and finishing rolling. The operation that the present invention does not mention all can adopt prior art.

[0016] Among them, the rolling process parameters are: heating temperature 1230°C, initial rolling start temperature 1100°C, finish rolling start temperature 936°C, finish rolling finish temperature 885°C;

[0017] The cooling process parameters are: the rolled piece is cooled at a cooling rate of 109 °C / s to a phase ...

Embodiment 2

[0019] Example 2, the low temperature resistant H-shaped steel has the following chemical components in mass percentage: carbon: 0.11%, silicon: 0.25%, manganese: 1.36%, phosphorus: 0.005%, sulfur: 0.007%, vanadium: 0.038%, Als : 0.019%, the balance is iron and impurity elements.

[0020] The steel undergoes molten iron pretreatment→converter smelting→argon blowing in ladle→LF refining→full-protection casting of shaped blanks→H-shaped steel wire rolling, and finally the rolled piece is cooled. Among them, H-shaped steel wire rolling includes rough rolling and finishing rolling. The operation that the present invention does not mention all can adopt prior art.

[0021] Among them, the rolling process parameters are: heating temperature 1235°C, initial rolling start temperature 1130°C, finish rolling start temperature 941°C, finish rolling finish temperature 890°C;

[0022] The cooling process parameters are: the rolled piece is cooled at a cooling rate of 105 °C / s to a phase ...

Embodiment 3

[0024] Example 3, the low temperature resistant H-shaped steel has the following chemical components in mass percentage: carbon: 0.10%, silicon: 0.26%, manganese: 1.39%, phosphorus: 0.007%, sulfur: 0.004%, vanadium: 0.034%, Als : 0.028%, the balance is iron and impurity elements.

[0025] The steel undergoes molten iron pretreatment→converter smelting→argon blowing in ladle→LF refining→full-protection casting of shaped blanks→H-shaped steel wire rolling, and finally the rolled piece is cooled. Among them, H-shaped steel wire rolling includes rough rolling and finishing rolling. The operation that the present invention does not mention all can adopt prior art.

[0026] Among them, the rolling process parameters are: heating temperature 1232°C, initial rolling start temperature 1115°C, finish rolling start temperature 945°C, finish rolling finish temperature 893°C;

[0027] The cooling process parameters are: the rolled piece is cooled at a cooling rate of 103 °C / s to a phase ...

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Abstract

The invention discloses low-temperature-resistant H-shaped steel comprising the following chemical components in percentage by mass: 0.08-0.13% of C, 0.15-0.35% of Si, 1.25-1.45% of Mn, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 0.02-0.05% of V and the balance of Fe and impurity elements. The rolling technological parameters are as follows: the heating temperature ranges from 1220 DEG C to 1240 DEG C, the initial blooming temperature ranges from 1050 DEG C to 1150 DEG C, the initial finish rolling temperature ranges from 930 DEG C to 950 DEG C, and the final finish rolling temperature ranges from 780 DEG C to 900 DEG C; the cooling technological parameters are as follows: a rolled piece is cooled to the interval of 550-650 DEG C at the speed of 100-150 DEG C / s to generate phase change, then, the rolled piece is heated to 700-750 DEG C, and finally, the H-shaped steel is naturally cooled to room temperature. The H-shaped steel can have extremely low ductile-brittle transition temperature and favorable low temperature impact resistance in high and cold areas and low-temperature environments with the temperature of 40 DEG C below zero and even lower.

Description

technical field [0001] The invention relates to the technical field of H-shaped steel production, in particular to a low-temperature-resistant H-shaped steel and a production process thereof. Background technique [0002] The ductile-brittle transition temperature of the current H-shaped steel is about -10°C. If the H-shaped steel is used in the alpine region and low temperature environment, it is prone to brittle fracture when subjected to dynamic load or impact, causing unnecessary losses. [0003] Especially for H-shaped steel in the environment of -40°C and below, the toughness of the H-shaped steel is low, and the low-temperature impact resistance is poor, which cannot meet the use requirements. [0004] For example, the Chinese invention patent with the publication number CN102618781A discloses a hot-rolled H-shaped steel for low-temperature-resistant structures and its preparation method. It strengthens the composition control of the shaped billet through the smelting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/00
Inventor 吴保桥龚庆华张卫斌吴湄庄蒲玉梅
Owner MAGANG (GROUP) HOLDING CO LTD
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