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590 Mpa-grade high-strength structural steel plate and manufacturing method thereof

A technology of structural steel plate and manufacturing method, applied in the field of smelting, to achieve high strength, improve plasticity and toughness index, and eliminate the effects of internal stress in organization

Inactive Publication Date: 2014-06-25
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, only Q345B and Q235B steel grades that meet national standards can be used, and the flatness index of 10mm / m can no longer meet the demand.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The slab smelting composition is:

[0022] C: 0.15%, Si: 0.27%, Mn: 1.55%, P: 0.013%, S: 0.001%, Nb: 0.027%, V: 0.045%, Ti: 0.017%, Al: 0.021%, Cu: 0.32%, B: 0.0014%; Mo: 0.16%; the rest is Fe and unavoidable impurities.

[0023] Slab soaking temperature (°C): 1130; soaking time (hours): 3.4; rough rolling temperature (°C): 1100; rough rolling single pass reduction rate (%): greater than 22; finish rolling temperature (°C) : 970; Finish rolling single pass reduction rate (%): greater than 18; Start cooling temperature (°C): 770; End cooling temperature (°C): 590; Cooling rate (°C / s): 19;

[0024] Steel plate mechanical properties:

[0025] Specifications: steel plate thickness 6mm; yield strength (MPa): 485; tensile strength (MPa): 630; elongation after fracture (%): 18; cold bending: qualified; V-shaped longitudinal impact energy (-20°C): 133J , 147J, 138J.

[0026] It is used in Q100 model 150t all-terrain hydraulic crane's 3rd-4th section telescopic boom structur...

Embodiment 2

[0028] With the steel blank in embodiment 1;

[0029] Slab soaking temperature (°C): 1140; soaking time (hours): 3.6; rough rolling temperature (°C): 1100; rough rolling single pass reduction rate (%): greater than 21; finish rolling temperature (°C) : 950; Finish rolling single pass reduction rate (%): greater than 18; Start cooling temperature (°C): 770; End cooling temperature (°C): 570; Cooling speed (°C / s): 19;

[0030] Steel plate mechanical properties:

[0031] Specifications: steel plate thickness 36mm; yield strength (MPa): 505; tensile strength (MPa): 650; elongation after fracture (%): 17; cold bending: qualified; V-shaped longitudinal impact energy (-20°C): 145J , 149J, 152J.

[0032] This thick steel plate is used in 50-ton excavators and 350-horsepower bulldozers, replacing 45mm-thick Q345B to manufacture frame structures and push rods and other difficult parts, saving 12% of steel, increasing digging force and thrust by 7%, and extending the service life by 3 ...

Embodiment 3

[0034] The slab smelting composition is:

[0035] C: 0.17%, Si: 0.27%, Mn: 1.55%, P: 0.013%, S: 0.001%, Nb: 0.027%, V: 0.045%, Ti: 0.017%, Al: 0.021%, Cu: 0.32%; B: 0.0016%; Mo: 0.21%; the rest is Fe and unavoidable impurities.

[0036] Slab soaking temperature (°C): 1150; soaking time (hours): 2.7; rough rolling temperature (°C): 1100; rough rolling single pass reduction rate (%): greater than 26; finish rolling temperature (°C) : 960; single pass reduction rate of finishing rolling (%): greater than 18; heating temperature (°C) 920; cooling rate (°C / s): 18; tempering (°C): 610, tempering time (hours): 1.1

[0037] Steel plate mechanical properties:

[0038] Specifications: steel plate thickness 60mm; yield strength (MPa): 510; tensile strength (MPa): 660; elongation after fracture (%): 16; cold bending: qualified; V-shaped longitudinal impact energy (-20°C): 123J , 131J, 136J.

[0039] 35-60mm thick steel plate is used for 4500-7200KN high-resistance hydraulic support b...

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Abstract

The invention relates to the technical field of smelting, and particularly relates to a 590 Mpa-grade high-strength structural steel plate and a manufacturing method thereof. The manufacturing method comprises the following steps: refining outside an LF (Ladle Furnace); carrying out RH (Ruhrstahl Hereaeus) secondary refining; adding alloy element protection; heating a plate blank; carrying out rough rolling; carrying out finish rolling; controlling the rolling and cooling, straightening, and controlling a plate shape. According to the steel plate produced by virtue of the manufacturing method, the yield strength of the steel plate is more than 450 MPa, the tensile strength is up to 590-670 MPa, the elongation percentage is more than 16%, and the minus 20 DEG C low-temperature flexibility is more than 34 joules. According to the high-strength steel, which is produced by adopting the manufacturing method, for a 12-200 ton excavator, a 200-350 horsepower bulldozer, a 50-300 ton hydraulic crane and a 4500-7200 KN high-resistance hydraulic support structure, excellent obdurability matching is achieved, the ductile-to-brittle transition temperature is below minus 30 DEG C, and the straightness is 1.7-3.5 mm / m. The yield strength range of the steel plate ranges from 480 MPa to 560 MPa, and the tensile strength of the steel plate ranges from 620 MPa to 760 MPa; the steel plate has high strength by being treated through a rolling and cooling control or quenching and tempering process, so that the structure internal stress is eliminated, the ductility and toughness indices are enhanced, and the elongation percentage can achieve 17%-25%.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a high-strength structural steel plate with a specification of 6-60 mm and a tensile strength of over 590 MPa, and also relates to a manufacturing method of the above-mentioned steel plate. Background technique: [0002] Structural steel plates used in construction machinery such as large excavators, high-powered bulldozers, and large hydraulic cranes have a yield strength of more than 450 MPa and a tensile strength of more than 590 MPa. The manufacturing process and use process include welding, bending, and cycle fatigue. In order to lift higher, More objects can be lifted, the thrust and excavation force are stronger, the rigidity of the structure is ensured, the strength is high, the weight is light, and the repeated fatigue performance is improved. Therefore, technical requirements such as stable quality, high strength, good toughness, high fatigue toughness, easy welding a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/32C22C38/28C21D8/02
Inventor 冯勇孙卫华孙德民刘晓东祝桂合周兰聚徐洪庆姜广林周波刘凤兰
Owner JIGANG GRP
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