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High-strength steel plate for Q500GJE quenched and tempered building structure and manufacturing method of high-strength steel plate

A technology of building structure and manufacturing method, applied in the field of Q500GJE quenched and tempered building structural steel plate and its manufacturing, can solve the problems of complex production process, uneven structure of rolled pieces, long rolling cycle, etc., and achieve simplified chemical composition, comprehensive Stable performance and the effect of reducing the thickness of steel structure materials

Active Publication Date: 2019-08-30
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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  • High-strength steel plate for Q500GJE quenched and tempered building structure and manufacturing method of high-strength steel plate
  • High-strength steel plate for Q500GJE quenched and tempered building structure and manufacturing method of high-strength steel plate

Examples

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Effect test

example 1

[0051] 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

[0052] 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 the finishing mill for rolling, and the final rolling temperature is 795°C; after rolling, the rolled piece is directly sent to the hot straightening machine for leveling; after hot rolling, cooling can be further controlled: the temperature of the steel plate after hot straightening Control at 480°C; quickly water-cool to 400°C at a cooling rate of 40°C / s, then send it to a cooling bed for natural cooling for 10 minutes, then slowly water-cool to 300±20°C, slow cooling at a cooling rate of 18 / °C / s, then off-line stack Slow cooling, stacking and slow cooling for more than 48 hours; then finishi...

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Abstract

The invention relates to a high-strength steel plate for a Q500GJE quenched and tempered building structure. The high-strength steel plate comprises the following chemical components: less than or equal to 0.14% 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, less than or equal to 0.20% of Cr, less than or equal to 0.30% of Mo, lessthan or equal to 0.90% of Ni+Mo, less than or equal to 0.30% of Cu, 0.02%-0.04% of Al, less than or equal to 0.20% of V+Nb+Ti, less than or equal to 0.006% of N, and the balance of Fe and inevitableimpurity elements, wherein the carbon equivalent is less than or equal to 0.52%. The yield strength is 545-585 MPa, the tensile strength is 670-715 MPa, and the elongation is larger than or equal to 18.5%. A high-strength steel product for a building, with the yielding-to-tensile ratio less than or equal to 0.84, and the V-type impact energy higher than or equal to 110 J at -40 DEG C, is of a ferrite+pearlite+bainite structure, and the grain size is 8.5 levels or above. The comprehensive performance can completely meet GB / T 19879-2015 and the clients' requirements of steel plates for high-risebuildings.

Description

technical field [0001] The invention relates to the technical field of special steel metallurgy, in particular to a Q500GJE quenched and tempered building structural steel plate and a manufacturing method thereof. Background technique [0002] In order to adapt to the development of high-rise and large-span building structures, it meets the demand for high-strength steel above 460MPa in the "Steel Plates for Building Structures" implemented in November 2016. The purpose is to reduce the weight of the building structure, reduce the construction cost, reduce the thickness of the steel structure material, and improve the reliability of the building when it is in a low temperature environment for a long time. It is imperative to develop high-strength steel plates for building structures such as Q500GJ and Q550GJ in the version of GB / T19879-2015 "Steel Plates for Building Structures" to meet the development requirements of the construction industry. [0003] In the prior art, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/42C22C38/46C22C38/48C22C38/50C22C38/58C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C21D2211/005C21D2211/009C22C38/001C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 周福功高助忠李经涛马菁
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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