Q500qE bridge steel plate and production method thereof

A production method and steel plate technology, applied in the field of bridge steel plate smelting, can solve the problems of high production difficulty, low yield strength ratio, unsuccessful production, etc., and achieve the effects of low production cost, low yield strength ratio and short production cycle

Active Publication Date: 2018-10-09
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the technical indicators including low carbon equivalent, low yield ratio, and tensile strength of Q500qE bridge steel plates are all higher than the bridge steel standards of various countries in the world, the production is extremely difficult, and there is no precedent for successful production.

Method used

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  • Q500qE bridge steel plate and production method thereof
  • Q500qE bridge steel plate and production method thereof
  • Q500qE bridge steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Smelted according to the chemical composition shown in Table 1, and cast into billets, the heating temperature is 1220 ° C, the total time in the furnace is 255 minutes, the first stage of rolling is rolling in the austenite recrystallization zone, the rolling temperature is 1105 ° C, except Except for the cross rolling pass, the reduction of each pass should be controlled above 15% as far as possible, and the reduction rate of at least 1-2 passes should be controlled above 20%. When the thickness of the rolled piece is 24mm, wait for the temperature on the roller table to 950°C, and then carry out the second stage of rolling, the rolling temperature is 950°C, the first and second passes must ensure that the reduction rate is ≥ 20%, and the final rolling temperature is 838°C, the thickness of the finished steel plate is 8mm. After rolling, the steel plate "relaxes" on the roller table after rolling for 15s and enters laminar flow cooling. Set the cooling control paramet...

Embodiment 2

[0054] The implementation is the same as in Example 1, wherein the heating temperature is 1225°C, the total time in the furnace is 259 minutes, the first stage rolling is rolling in the austenite recrystallization zone, and the rolling start temperature is 1108°C, except for the cross rolling pass , The reduction of each pass should be controlled above 15% as far as possible, and the reduction rate of at least 1 to 2 passes should be controlled above 20%. When the thickness of the rolled piece is 50mm, wait for the temperature on the roller table to 920°C, and then carry out the second stage of rolling, the rolling temperature is 917°C, the first and second passes must ensure that the reduction ratio is ≥ 20%, and the final rolling temperature is 819°C, the thickness of the finished steel plate is 20mm. After rolling, the steel plate "relaxes" for 58s and enters laminar flow cooling. Set the controlled cooling parameters according to Table 2, and cool the steel plate to 420°C....

Embodiment 3

[0056] The implementation is the same as in Example 1, wherein the heating temperature is 1225°C, the total time in the furnace is 251 minutes, the first stage of rolling is rolling in the austenite recrystallization zone, and the rolling start temperature is 1095°C, except for the cross rolling pass , The reduction of each pass should be controlled above 15% as far as possible, and the reduction rate of at least 1 to 2 passes should be controlled above 20%. When the thickness of the rolled piece is 80mm, wait for the temperature on the roller table to 820°C, and then carry out the second stage of rolling, the rolling temperature is 819°C, the first and second passes must ensure that the reduction rate is ≥ 20%, and the final rolling temperature is 791°C, the thickness of the finished steel plate is 32mm. After rolling, the steel plate "relaxes" for 135s and enters laminar flow cooling. Set the controlled cooling parameters according to Table 2, and cool the steel plate to 350...

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Abstract

The invention relates to the technical field of bridge steel plate smelting, in particular to a Q500qE bridge steel plate and a production method thereof. After rolling control is finished, the steelplate is relaxed for 10-160 seconds after rolling is finished, and then enters a laminar flow cooling area to be cooled to 300-650 DEG C with the cooling rate of 20 DEG C / s; and the relaxation time and the finished cooling temperature of steel plates of different thicknesses are different. After the steel plate is subjected to controlled cooling, the steel plate is straightened for more than two passes through a heat straightening machine, the poor external plate shape caused by online quenching is eliminated, then the steel plate is cooled to below 400 DEG C on a cooling bed and then is straightened by a cold straightening machine, the finished straightening temperature is controlled to be 200-400 DEG C, and the poor plate shape caused by transformation stress is eliminated. The Q500qE bridge steel plate and the production method thereof have the advantages that the yield ratio is low, the welding performance is good, the plate shape is good, the production process is simple in procedure, the production period is short, and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of smelting bridge steel plates, in particular to a Q500qE bridge steel plate and a production method thereof. Background technique [0002] With the rapid development of basic transportation facilities such as highways, railways and cross-sea transportation in my country, the span and load of steel structure bridges have increased, and higher requirements have been placed on the strength of steel plates for steel structure bridges. The steel plates are required to have higher strength and toughness. Excellent fracture and aging properties, and at the same time require good welding performance, fatigue resistance, atmospheric and seawater corrosion resistance, etc. With the improvement of strength, the strength of bridge steel is also gradually upgraded from low-alloy bridge steels such as Q345qD, Q370qD, and Q370qE to Q420qD, Q420qE, etc. Performance bridge steels are also beginning to be tested in applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/58
CPCC21D8/0205C21D8/0226C21D8/0263C21D2211/005C21D2211/009C22C38/02C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/58
Inventor 田宇石锋涛蒋琳隋松言
Owner ANGANG STEEL CO LTD
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