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

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

Example Embodiment

[0023] Example 1

[0024] The molten steel is smelted in a 150-ton converter according to the set composition and continuously cast into a slab. The set composition is C 0.06% by weight, 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 iron Fe, the thickness of the cast slab is 220mm.

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

[0026] The intermediate billet is finished rolling, the finishing rolling process is 7 passes, the finishing rolling temperature is 980℃, the second rolling temperature is 950℃, the third rolling temperature is 930℃, the fourth rolling temperature is 890℃, and the fifth rolling temperature is 850℃. ℃, the six-rolling temperature is 820℃, the final rolling temperature is 800℃, the reductio...

Example Embodiment

[0028] Example 2

[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 58 mm was obtained.

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

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

Example Embodiment

[0033] Example 3

[0034] 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.

[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℃, the second rolling temperature is 980℃, the third rolling temperature is 920℃, the fourth rolling temperature is 900℃, and the final rolling temperature is 880 ℃, the reduction of each pass of finishing rolling is controlled at 15-40%, and the thickness of the strip after finishing rolling is 4mm.

[0037] After finishing rolling, it is water-cooled to 200°C at a speed of 15°C / s, and then coiled by a coiler. The composition obtained by weight percentage is 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 balan...

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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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