Thick gauge q450nqr1 steel plate and its rough rolling method

A thick-gauge, steel plate technology, applied to weathering steel and its rolling, thick-gauge Q450NQR1 steel plate and its rough rolling, to achieve the effect of large margin, improved grain uniformity, and good application value

Active Publication Date: 2018-03-06
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the purchase of additional equipment is restricted by cost control and site conditions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Thick gauge q450nqr1 steel plate and its rough rolling method
  • Thick gauge q450nqr1 steel plate and its rough rolling method
  • Thick gauge q450nqr1 steel plate and its rough rolling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1—5

[0043] The Q450NQR1 billets of Examples 1-5 were smelted according to the chemical composition in Table 1, and the thicknesses of the billets of Examples 1-5 were 200mm, 230mm, 230mm, 230mm, and 230mm respectively.

[0044] Billet chemical composition % of table 1 embodiment 1-5

[0045]

[0046] All odd and even passes are used for full descaling, and the rolling rate is shown in Table 2. The rough rolling compression ratio is not changed, and the rough rolling descaling water is fully opened for odd and even passes. The surface temperatures of Examples 1-5 are respectively 910, 930, 930, 940, and 920; the cooling depths are respectively 10mm, 18mm, 16mm, 18mm, and 20mm to control the temperature difference between the surface layer and the core between 30 and 200°C.

[0047] The rolling parameter of table 2 embodiment 1-5

[0048]

[0049] The finished product thicknesses of Examples 1-5 obtained by rolling are respectively 12 mm. The surface and core grain size is d...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention relates to weathering steel and a rolling method thereof, in particular to a thick-gauge Q450NQR1 steel plate and a rough rolling method thereof, and belongs to the technical field of steel and iron. The rough rolling method of the thick-gauge Q450NQR1 steel plate is characterized in that the steel plate is prepared from the following chemical ingredients in percentage by weight: 0.05 to 0.08 percent of C, 0.25 to 0.40 percent of Si, 0.8 to 1.45 percent of Mn, at most 0.018 percent of P, at most 0.008 percent of S, 0.32 to 0.38 percent of Cr, 0.12 to 0.20 percent of Ni, 0.20 to 0.25 percent of Cu, 0.05 to 0.06 percent of V, 0.03 to 0.045 percent of Nb and the balance of Fe and unavoidable impurities, wherein the rough rolling method uses odd-even pass whole-course whole-number scale removal; all scale removal water in odd-even passes is in the boiling state; the rolling is performed at a low speed. The difficult problem of original crystalline grain nonuniformity in the cooling process is solved; the cost is low.

Description

technical field [0001] The invention relates to weather-resistant steel and a rolling method thereof, in particular to a thick gauge Q450NQR1 steel plate and a rough rolling method thereof, and belongs to the technical field of iron and steel. Background technique [0002] The microstructure is an important factor in determining hot-rolled steel products. The uneven structure of the surface and the core often leads to poor mechanical properties of the product and large fluctuations. Especially in the low-temperature impact test, the uneven microstructure size often causes the difference in the ductile-brittle transition temperature, resulting in poor impact toughness or large fluctuations in impact toughness of the material. [0003] In the hot rolling process, due to the limitation of the law of deformation itself, under a certain amount of deformation, the strain rate of the surface layer is always greater than that of the core, resulting in the difference in the grain siz...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/08C22C38/16C22C38/12B21B1/26
CPCB21B1/26C22C38/02C22C38/04C22C38/08C22C38/12C22C38/16C22C38/18
Inventor 刘序江李俊洪罗许肖强
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap