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Hot-rolled beam steel with a tensile strength of more than 710MPa and preparation method thereof

A technology with a tensile strength of 710mpa, applied in the field of materials, can solve the problems of high steel production cost and low strength level of girder steel, and achieve the effect of improving yield strength and tensile strength, good low-temperature toughness and formability, and reducing costs

Inactive Publication Date: 2011-02-16
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Girder steel is mainly used for stamping structural parts such as frame longitudinal beams and beams of trucks and light vehicles. The current tensile strength of ordinary girder steel is mostly 510MPa and 610MPa. The requirements for cost reduction and fuel economy are getting higher and higher. The strength level of existing girder steel is generally low, and there is an urgent need to develop higher strength girder steel. However, 600 ~700MPa grade girder steel often adopts the idea of ​​alloying, and the number of alloying elements is large, and alloying elements such as Mo, Cr, and Ni with high added value are added, resulting in high steel production costs

Method used

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  • Hot-rolled beam steel with a tensile strength of more than 710MPa and preparation method thereof
  • Hot-rolled beam steel with a tensile strength of more than 710MPa and preparation method thereof
  • Hot-rolled beam steel with a tensile strength of more than 710MPa and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The molten steel is smelted in a 150-ton converter according to the set composition and continuously cast into a cast slab. Its composition is C0.06%, Si0.20%, Mn 1.70%, Nb 0.03%, Ti0.05%, P0. 003%, S0.008%, the balance is iron Fe, and the thickness of the cast slab is 230mm.

[0020] The cast slab is heated to 1250°C for rough rolling. The rough rolling process is 3 passes, the roughing start-rolling temperature is 1170°C, and the roughing final rolling temperature is 1070°C to obtain an intermediate slab with a thickness of 50mm.

[0021] The intermediate billet is finished rolling, the finishing rolling process is 5 passes, the finishing rolling temperature is 1000℃, the second rolling temperature is 980℃, the third rolling temperature is 920℃, the fourth rolling temperature is 880℃, and the final rolling temperature is 860 ℃, the reduction of each pass of finishing rolling is controlled at 15-40%, and the thickness of finishing rolling is 14mm.

[0022] After finishing ro...

Embodiment 2

[0024] The preparation method and composition of the cast slab are the same as in Example 1, and the thickness of the cast slab is 240 mm.

[0025] The rough rolling process was the same as in Example 1, and an intermediate billet with a thickness of 45 mm was obtained.

[0026] The intermediate billet is finished rolling, the finishing rolling process is 6 passes, the finish rolling temperature is 960℃, the second rolling temperature is 940℃, the third rolling temperature is 920℃, the fourth rolling temperature is 900℃, and the fifth rolling temperature is 840 ℃, the final rolling temperature is 820℃, the reduction of each pass of finishing rolling is controlled at 15-40%, and the thickness of finishing rolling is 10mm.

[0027] After finishing rolling, it is water-cooled to 550°C at a speed of 25°C / s, and then coiled by a coiler to obtain the finished hot-rolled beam steel. The mechanical properties test results are: yield strength 640MPa, tensile strength 740MPa, and elongation af...

Embodiment 3

[0029] The preparation method and composition of the cast slab are the same as in Example 1, and the thickness of the cast slab is 250 mm.

[0030] The rough rolling process was the same as in Example 1, and an intermediate billet with a thickness of 38 mm was obtained.

[0031] The intermediate billet is subjected to finishing rolling, the finishing rolling process is 7 passes, the finishing rolling temperature is 980°C, the second rolling temperature is 950°C, the third rolling temperature is 930°C, the fourth rolling temperature is 890°C, and the fifth rolling temperature is 850°C. ℃, the six rolling temperature is 820℃, the final rolling temperature is 780℃, the reduction of each pass of finishing rolling is controlled at 15-40%, and the thickness of finishing rolling is 6mm.

[0032] After finishing rolling, it is water-cooled to 620°C at a speed of 40°C / s, and is coiled by a coiler to obtain the finished hot-rolled beam steel. The mechanical properties test results are: yield s...

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Abstract

The invention relates to hot-rolled beam steel with a tensile strength of more than 710MPa and a preparation method thereof, belonging to the material technical field; the beam steel comprises the following components by weight percent: 0.06-0.12% of C, 0.01-0.20% of Si, 1.40-1.70% of Mn, 0-0.03% of Nb, 0.05-0.10% of Ti, less than 0.01% of P, less than 0.01% of S and the balance Fe; the yield strength is at least 600MPa, the tensile strength is at least 710MPa and the percentage elongation after fracture is at least 23%. The preparation method comprises the following steps: smelting molten steel according to the defined composition, casting and rolling to obtain casting blanks, heating the casting blanks to 1220-1280 DEG C for rough rolling, obtaining intermediate blanks; planishing the intermediate blanks and cooling the material to 450-620 DEG C at a speed of 10-40 DEG C / s. The hot-rolled beam steel of the invention has good low temperature toughness and formability and low production cost.

Description

Technical field [0001] The invention belongs to the technical field of materials, and particularly relates to a hot-rolled beam steel with a tensile strength higher than 710 MPa and a preparation method thereof. Background technique [0002] With the development of society and economy, the steel industry is facing increasing pressure to save resources, save energy, and protect the environment. Therefore, how to reduce the composition design and rolling process of traditional steel materials, thereby greatly improving its performance, prolonging its service life, and effectively improving resource utilization and recycling rates, has become the research field of steel materials. Hot spot. Frame steel is mainly used for stamping structural parts such as longitudinal beams and beams of trucks and light vehicles. At present, the tensile strength of ordinary beam steel is mostly 510MPa and 610MPa. The requirements for cost reduction, control and fuel economy are getting higher and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/74C22C33/04B21B1/08C21D8/00B21B37/58C22C38/14B21B37/16B21C37/00
Inventor 衣海龙杜林秀吴迪王国栋
Owner NORTHEASTERN UNIV LIAONING
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