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Steel plate for AS/NZS 3678-350L15Z35 structure, and manufacturing method thereof

A technology for structural and steel plates, which is applied in the field of AS/NZS3678-350 series structural steel, can solve the problems of high production cost and difficulty in mass production of the process, and achieve the effect of low production cost and short production cycle

Inactive Publication Date: 2020-05-01
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to mass-produce the process; and the production cost is high

Method used

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  • Steel plate for AS/NZS 3678-350L15Z35 structure, and manufacturing method thereof
  • Steel plate for AS/NZS 3678-350L15Z35 structure, and manufacturing method thereof
  • Steel plate for AS/NZS 3678-350L15Z35 structure, and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment relates to the rolling production of 12mm thick steel plates. The specification of the continuous casting slab used is 150mm×2400mm×3200mm, and the specification of the final product is 12×3000×L (length) mm. The billet is cold loaded into the heating furnace, the temperature of the preheating section of the heating furnace: 680-700℃, the temperature of the heating section: 950-1000℃, the temperature of the second heating section: 1180-1200℃, the temperature of the soaking section: 1240-1250℃; Total time 166 minutes. After being out of the furnace, high-pressure water descaling, and then rolling, including 5 passes of rough rolling, the thickness of the intermediate billet is 40mm, after warming, the starting rolling temperature of the finishing mill is 910°C, after 7 passes of rolling, the final rolling temperature is 816°C After the rolling is completed, it is straightened 3-5 times or leveled by a leveler, sent to a cooling bed to cool to room tempera...

Embodiment 2

[0033] Production and rolling of 50mm thick steel plate example. The continuous casting slab is 250×2400×3500mm, and the rolled finished plate is 50×2700×L (length) mm. Blank is cold-packed into heating furnace, and heating process is the same as example 1, and total heating time is 276 minutes. Rough rolling is rolled for 7 passes, and the thickness is 107mm. After warming, the starting temperature of the finishing mill is 830°C. The finish rolling is rolled for 7 passes, and the final rolling temperature is 801°C. After rolling, it is straightened by a leveler. Send it to the cooling bed for cooling, cool down to 360°C, and then cool down slowly in the line stack; after 26 hours, take samples, perform physical and chemical inspections and quality inspections. The physical and chemical performance test results are shown in Table 1, and the metallographic structure is as follows figure 1

[0034] Table 1

[0035]

[0036]

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Abstract

The product has a yield strength of not less than 390MPa, a tensile strength of not less than 510MPa, and an elongation of not less than 23%; the Charpy impact work (V gap) at -15 DEG C is not less than 100J; the z-directional performance is not less than 40%; and the comprehensive performance is completely capable of meeting the customer requirements of steel products for AS / NZS 3678:2016, buildings, bridges and engineering machinery.

Description

technical field [0001] The invention relates to Z35 structural steel, in particular to an AS / NZS 3678-350 series structural steel. Background technique [0002] Z-direction steel is a common name for steel plates with properties in the thickness direction, and there are special regulations on the mechanical properties in the thickness direction of thicker steel plates. In the structural steel connected by welding, when the thickness of the steel plate is not less than 15mm and bears the tensile force along the thickness direction of the plate, in order to avoid lamellar tearing during welding, it is necessary to adopt anti-lamellar tearing steel (often referred to simply as "Z-direction steel"). Thick plates have the problem of lamellar tearing, so a Z-direction performance test is proposed. This kind of steel plate is a steel that has been specially smelted and treated on the basis of a certain level of structural steel (called parent steel). . The mechanical properties...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C21D8/02
CPCC21D8/0226C21D2211/001C21D2211/005C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 周福功李国忠许晓红苗丕峰王新刚
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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