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Yield strength 1100MPa level engineering machinery non-quenched and tempered hot rolled strip and preparation method thereof

A yield strength, engineering machinery technology, applied in the metallurgical field, can solve the problem of high production cost, achieve the effect of improving welding performance, reducing production cost and good plasticity

Inactive Publication Date: 2013-02-27
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic scholars such as Kang Yonglin, Zheng Hua, Yao Liandeng have conducted detailed research on high-strength low-carbon bainite. Through the addition of alloying elements such as Nb, Ti, Ni, Mo, and B, the formation of niobium-titanium precipitation strengthens bonded bainite. The phase transformation strengthening of the structure makes the steel have better formability and low temperature toughness. From the composition design, a large amount of precious alloying elements such as Nb, Ni and Mo are used, so the production cost is high

Method used

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  • Yield strength 1100MPa level engineering machinery non-quenched and tempered hot rolled strip and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Molten steel is smelted in a 150-ton converter according to the set composition, and continuously cast into a billet. The set composition is C 0.06%, Si 0.20%, Mn 1.60%, Nb 0.02%, V 0.04%, Ti 0.15% by weight percentage , Ni 0.4%, Mo 0.20%, P<0.012%, S<0.01%, the balance is iron Fe, and the thickness of the slab is 220mm.

[0025] The cast slab was heated to 1250°C for rough rolling, the rough rolling process was 5 passes, the rough rolling start temperature was 1170°C, and the rough rolling finish rolling temperature was 1070°C to obtain an intermediate slab with a thickness of 38mm.

[0026]Finish rolling of the intermediate billet, the finishing rolling process is 7 passes, the starting temperature of the finishing rolling is 980°C, the temperature of the second rolling is 950°C, the temperature of the third rolling is 930°C, the temperature of the fourth rolling is 890°C, and the temperature of the fifth rolling is 850°C ℃, the sixth rolling temperature is 820 ℃, the...

Embodiment 2

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

[0030] The rough rolling process was the same as in Example 1, and an intermediate billet with a thickness of 58 mm was obtained.

[0031] The intermediate billet is finished rolling, the finishing rolling process is 6 passes, the starting temperature of the finishing rolling is 950°C, the temperature of the second rolling is 930°C, the temperature of the third rolling is 910°C, the temperature of the fourth rolling is 880°C, and the temperature of the fifth rolling is 850°C ℃, the finish rolling temperature is 830 ℃, the reduction in each pass of finish rolling is controlled at 15~40%, and the strip thickness after finish rolling is 6mm.

[0032] After finishing rolling, it is water-cooled to 400°C at a speed of 35°C / s, and coiled by a coiler to obtain components by weight percentage of C 0.06%, Si 0.20%, Mn 1.60%, Nb 0.02%, V 0.04%, Ti 0.15 %, N...

Embodiment 3

[0034] The preparation method and composition of the slab are the same as in Example 1, and the thickness of the slab is 240mm.

[0035] The rough rolling process was the same as in Example 1, and an intermediate billet with a thickness of 45 mm was obtained.

[0036] The intermediate billet is finished rolling, the finishing rolling process is 5 passes, the finishing rolling temperature is 1020°C, the second rolling temperature is 980°C, the third rolling temperature is 920°C, the fourth rolling temperature is 900°C, and the final rolling temperature is 880°C ℃, the reduction in each pass of finish rolling is controlled at 15~40%, and the strip thickness after finish rolling is 4mm.

[0037] After finishing rolling, it is water-cooled to 200°C at a speed of 15°C / s, and coiled by a coiler to obtain components by weight percentage of C 0.06%, Si 0.20%, Mn 1.60%, Nb 0.02%, V 0.04%, Ti 0.15 %, Ni 0.4%, Mo 0.20%, P<0.012%, S<0.01%, the balance is the finished hot-rolled steel str...

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Abstract

The invention belongs to the technical field of metallurgy and in particular to a yield strength 1100MPa level engineering machinery non-quenched and tempered hot rolled strip and a preparation method thereof. The chemical components of the yield strength 1100MPa level engineering machinery non-quenched and tempered hot rolled strip comprises, by weight, C 0.06-0.12%, Si 0.10-0.30%, Mn 1.60-2.00%, Nb 0.00-0.04%, V 0.00-0.04%, Ti 0.15-0.20%, Ni 0.4-0.80%, Mo 0.20-0.60%, P<0.012%, S<0.01%, and the balance Fe. The yield strength is greater than or equals to 1100MPa, the tensile strength is greater than or equals to 1180MPa, and percentage elongation after fracture is greater than or equals to 11%. The yield strength 1100MPa level engineering machinery non-quenched and tempered hot rolled strip is designed by adopting low carbon components, and by reasonably adding microalloy elements and controlled rolling and controlled cooling technology, production yield strength is greater than or equals to 1100MPa, the tensile strength is greater than or equals to 1180MPa, and percentage elongation after fracture is not lower than 11%. Simultaneously, structure steel strips is provided with good usability, the metallographic structure is bainite / martensitic structures which are small in grain, cost capable of being reduced no less than 300 yuan per ton, and great economic benefit can be generated.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a non-quenched and tempered hot-rolled steel strip for engineering machinery with a yield strength of 1100 MPa and a preparation method thereof. Background technique [0002] With the development of the construction machinery industry, the demand for high-strength steel with a strength level above 900MPa is becoming more and more urgent. At the same time, in order to save resources, save energy and protect the environment, it is urgent to develop high-quality steel with higher strength. At present, the strength level of high-strength steel ranges from a yield strength of 900MPa to a yield strength of more than 1100MPa. Generally speaking, the comprehensive requirements for strength, toughness and welding performance are getting higher and higher. [0003] Foreign scholars Koo et al., used low C and high Mn, added Nb, V, Ni, Mo, B and other alloying elements, and pr...

Claims

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Application Information

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IPC IPC(8): C22C38/14B21B37/74
Inventor 衣海龙刘振宇吴迪王国栋
Owner NORTHEASTERN UNIV
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