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A high-strength q500gjd quenched and tempered state building structure steel plate and its manufacturing method

A technology of building structure and manufacturing method, applied in the field of Q500GJD quenched and tempered building structural steel plate and its manufacturing field, can solve the problems of complex production process, long rolling period, increased production process, etc., and achieve good comprehensive performance, uniform performance, The effect of reducing construction costs

Active Publication Date: 2019-06-25
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2) The production process is complex and the rolling cycle is long
This method of cooling while rolling is not conducive to rolling with a large reduction; and when the temperature difference between the inside and the surface of the rolled piece is large, large deformation may also cause uneven structure of the rolled piece
3) Increased production process
4) Low compression ratio: The compression ratio of 100-120mm extra-thick plate produced by 300mm continuous casting slab is only 2.5-3.0, which cannot guarantee the structure of corresponding performance

Method used

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  • A high-strength q500gjd quenched and tempered state building structure steel plate and its manufacturing method
  • A high-strength q500gjd quenched and tempered state building structure steel plate and its manufacturing method
  • A high-strength q500gjd quenched and tempered state building structure steel plate and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044] Example 1: A 370mm thick continuous casting billet was used to produce a rolled 40mm thick steel plate. The continuous casting slab is 370×2300×3200mm, and the rolled finished plate is 40×2600×L (length) mm. The blank is cold loaded into the heating furnace. The temperature of the preheating section of the heating furnace: 650-700℃, the temperature of the heating section: 1000-1050℃, the temperature of the second heating section: 1150-1200℃, the temperature of the soaking section: 1180-1220℃; Total time 220 minutes. After rough rolling, the thickness of the waiting temperature is 88mm; after warming, the starting temperature of the finishing mill is 820°C, rolling through the finishing mill, and the final rolling temperature is 810°C; it is leveled by a hot straightening machine; Roll off the production line at 335°C for slow cooling; after 37 hours of slow cooling, the appearance quality inspection of the steel plate is carried out; qualified plates are transferred to...

example 2

[0045] Example 2: Design and use 150mm thick continuous casting billet to produce and roll 20mm thick steel plate. The continuous casting slab used is 150×2400×3500 mm, and the rolled finished plate is 12×2800×L (length) mm. The billet is cold-loaded into the heating furnace, and the heating process is the same as the example 1. After rough rolling to a thickness of 65mm, it is sent to a finishing mill for rolling, and the final rolling temperature is 795°C; after rolling, the rolled piece is directly sent to a hot straightening machine for leveling; it is sent to a cooling bed for natural cooling; then finishing, steel plate appearance quality inspection; Qualified boards are transferred to the heat treatment process. Quenching temperature is 905°C, time in furnace is 25 minutes, water cooling; tempering temperature is 660°C, time in furnace is 27 minutes, air cooling to room temperature. Flaw detection, appearance quality inspection and sampling, physical and chemical insp...

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Abstract

The invention relates to a high strength Q500GJD quenched and tempered state steel plate used for a building structure. The steel plate comprises chemical compositions of 0.10-0.15% of C, 0.20-0.50% of Si, 1.10-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.10-0.30% of Cr, less than or equal to 0.30% of Mo, 0.15-0.90% of Ni and Mo, less than or equal to 0.30%of Cu, 0.02-0.04% of Al, 0.030-0.080% of V, 0.01-0.02% of Ti, less than or equal to 0.12% of V and Nb and Ti, and less than or equal to 0.006% of N. The carbon equivalent is less than or equal to 0.52% and the steel grade is Q500GJD. The invention relates to the Q500GJD steel plate with the delivery state as a QT (quenched and tempered) state for the building structure, the yield strength is 540-580MPa, the tensile strength is 670-710MPa, and the elongation is greater than or equal to 18%; and the steel plate is a high strength building steel plate product with the yield ratio being less thanor equal to 0.82, and the V type impact work at -20 DEG C being greater than or equal to 100J.

Description

technical field [0001] The invention relates to the technical field of special steel metallurgy, in particular to a Q500GJD quenched and tempered building structural steel plate and a manufacturing method thereof. Background technique [0002] Structural steel GJ used in large-scale construction projects such as high-rise buildings, super high-rise buildings, long-span stadiums, airports, exhibition centers, and steel structure workshops has strict requirements, and it exists as a special steel grade that is different from other steel grades. The classification of construction structural steel in the construction industry is also very specific and clear, and different grades have different uses. [0003] "Steel Plates for Building Structures" (GB / T 19879-2015), which was implemented in November 2016, added several high-strength grades such as Q500GJ, Q550GJ, etc. compared to GB / T 19879-2005. This shows that in recent years, more and more steel plates have been used in high-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/44C22C38/42C22C38/06C22C38/46C22C38/50C22C38/58C22C38/48C22C38/22C22C38/20C22C38/24C22C38/26C22C38/28C22C38/38C21D8/02C21D1/18
Inventor 周福功钱刚李经涛马菁
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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