Unlock instant, AI-driven research and patent intelligence for your innovation.

High-strength steel plate having extra thickness of 80-120mm and method for producing same from continuous casting billet

A high-strength steel plate and extra-thick technology, which is applied in the field of 80-120mm extra-thick high-strength steel plate and its continuous casting slab production, and can solve problems such as continuous casting slab production methods that have not yet appeared

Inactive Publication Date: 2015-06-10
JIGANG GRP
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] All the above are the deficiencies in the prior art, and there is no production method utilizing continuous casting slab so far

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
  • High-strength steel plate having extra thickness of 80-120mm and method for producing same from continuous casting billet
  • High-strength steel plate having extra thickness of 80-120mm and method for producing same from continuous casting billet
  • High-strength steel plate having extra thickness of 80-120mm and method for producing same from continuous casting billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The chemical composition of the steel plate is:

[0051] C: 0.15%, Si: 0.21%, Mn: 1.32%, P: 0.014%, S: 0.008%, Ni: 0.16%, Cr: 0.40%, Mo: 0.22%, Nb: 0.017%, Ti: 0.016%, Al: 0.025%, B: 0.0015%; CEV: 0.50%. The rest is Fe and unavoidable impurities.

[0052] The production method of steel plate is as follows:

[0053] 1) Qualified molten steel with the above composition is obtained by adopting molten iron pre-desulfurization technology, converter top-bottom composite blowing, and LF+RH vacuum treatment. The Ca-treated molten steel is cast into slabs by using the full protection pouring process; the thickness of the slabs is 250 mm.

[0054] 2) According to the treatment method of crack-prone steels, the continuous casting slabs are stacked off-line and slowly cooled for 48 hours to reduce the segregation of elements in the core of the slab, uniform the internal stress of the slab and reduce the micro-cracks in the core of the slab; the slab is reheated The temperature ...

Embodiment 2

[0060] The chemical composition of the steel plate is:

[0061]C: 0.18%, Si: 0.37%, Mn: 1.16%, P: 0.009%, S: 0.004%, Ni: 0.26%, Cr: 0.55%, Mo: 0.31%, Nb: 0.027%, Ti: 0.026%, Al: 0.038%, B: 0.0025%; CEV: 0.56%. The rest is Fe and unavoidable impurities.

[0062] The production method of steel plate is as follows:

[0063] 1) Qualified molten steel with the above composition is obtained by adopting molten iron pre-desulfurization technology, converter top-bottom composite blowing, and LF+RH vacuum treatment. The Ca-treated molten steel is cast into a slab by using the whole protection pouring process; the thickness of the slab is 300mm.

[0064] 2) According to the treatment method of crack-prone steel, the continuous casting slabs are stacked off-line and slowly cooled for 72 hours to reduce the segregation degree of elements in the core of the slab, uniform the internal stress of the slab and reduce the micro-cracks in the core of the slab; the slab is reheated The tempera...

Embodiment 3

[0070] The chemical composition of the steel plate is:

[0071] C: 0.16%, Si: 0.31%, Mn: 1.22%, P: 0.012%, S: 0.005%, Ni: 0.21%, Cr: 0.49%, Mo: 0.27%, Nb: 0.020%, Ti: 0.019%, Al: 0.033%, B: 0.0021%; CEV: 0.53%. The rest is Fe and unavoidable impurities.

[0072] The production method of steel plate is as follows:

[0073] 1) Qualified molten steel with the above composition is obtained by adopting molten iron pre-desulfurization technology, converter top-bottom composite blowing, and LF+RH vacuum treatment. The molten steel treated with Ca was poured into a slab by adopting the whole protection pouring process; the thickness of the slab was 270mm.

[0074] 2) According to the treatment method of crack-prone steel, the continuous casting slabs are stacked off-line and slowly cooled for 60 hours to reduce the segregation degree of the elements in the core of the slab, and the internal stress of the slab is uniform to reduce the micro-cracks in the core of the slab; the slab i...

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
yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of extra-thick quenched and tempered high-strength steel and a production method thereof, and particularly relates to a high-strength steel plate having an extra thickness of 80-120mm and a method for producing the same from a continuous casting billet. The steel plate comprises the following chemical components in percentage by weight: 0.15-0.19% of carbon (C), 0.20-0.40% of silicon (Si), 1.15-1.35% of manganese (Mn), no more than 0.015% of phosphorus (P), no more than 0.008% of sulfur (S), 0.15-0.30% of nickel (Ni), 0.40-0.60% of chromium (Cr), 0.20-0.35% of molybdenum (Mo), 0.015-0.030% of niobium (Nb), 0.015-0.030% of titanium (Ti), 0.020-0.045% of aluminum (Al), 0.0010-0.0030% of boron (B), no more than 0.56% of carbon equivalent (CEV) and the balance of iron and inevitable impurities. According to the scheme, the contents of noble alloy elements such as Cr, Ni, Mo and the like are reduced, thus reflecting low-cost economic design; and the steel plate having an extra thickness of 80-120mm is directly produced from a continuous casting billet, thus simplifying the technical process, fully taking advantages of the improvement effect on the core structure according to a high-temperature stage reduction schedule, mining the maximum potential of heat treatment, improving the hardenability by means of a technical means, and ensuring the uniform high-thickness cross section property.

Description

technical field [0001] The invention belongs to the technical field of extra-thick quenched and tempered high-strength steel and its production method, and in particular relates to the production of 80-120mm economical 800MPa grade high-strength thick steel plate by continuous casting slab under low compression ratio and its manufacturing method, specifically a An 80-120mm extra-thick high-strength steel plate and its production method by using continuous casting slabs. Background technique [0002] Extra-thick plates (over 80mm thick) are commonly used in nuclear power steel, electric power steel, high-end mold steel, pressure vessel steel, offshore platform steel, and high-rise building steel. It is a high value-added product. High-strength extra-thick steel plates with a tensile strength of 800MPa that have been used for a long time at home and abroad are mainly manufactured by high-alloying, traditional die-casting ingot rolling, electroslag remelting ingot rolling, and ...

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): C22C38/54C22C33/04C21D8/02
Inventor 胡淑娥侯东华王金华贾慧领王兵
Owner JIGANG GRP