Production method of high straightness super-strength steel

A technology of ultra-high-strength steel and production method, which is applied in the production field of ultra-high-strength steel with high flatness and yield strength of 1100MPa, which can solve the problems of cutting deformation and bending accuracy, large internal stress of steel plate, high alloy content, etc., and achieve rolling deformation The effects of small resistance, internal stress removal and high bending precision

Active Publication Date: 2019-01-22
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent 201610587785.6 announced "a steel plate with excellent cold bending performance and yield strength greater than 1100MPa and its preparation method". The ACC is cooled to 630-750°C, and the steel plate is straightened after quenching without tempering, and the steel plate still has a large internal stress, which

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Embodiment one: the production of 8mmQ1100E steel plate

[0017] The mass percentage of chemical composition of steel is C=0.17, Si=0.28, Mn=1.25, P=0.011, S=0.0021, Nb=0.015, V=0.022, Ti=0.018, Als=0.030, Cr=0.53, Mo=0.20 , Ni=0.21, B=0.0018, CEV=0.55, the balance is Fe and other trace elements. The production process steps include:

[0018] Rolling process: After the slab is heated by the heating furnace, the tapping temperature is 1230°C, the soaking time is 33 minutes, the thickness of the intermediate slab is 55mm after 7 passes of rough rolling, and the reduction rate of the last three passes of the rough rolling mill is average Above 22%, the finishing rolling temperature is 841~863°C, rolled into a steel plate with a thickness of 8mm, then rapidly cooled to 732~755°C, straightened by a pre-leveler and a hot straightener, and air-cooled in a cooling bed , Cold straightening is carried out again before the steel plate is off-line and stacked.

[0019] Quenching...

Example Embodiment

[0021] Embodiment two: the production of 11mmQ1100E steel plate

[0022] The mass percentage of chemical composition of steel is: C=0.18, Si=0.28, Mn=1.24, P=0.010, S=0.0018, Nb=0.016, V=0.021%, Ti=0.017, Als=0.030, Cr=0.55, Mo =0.21, Ni=0.20, B=0.0018, CEV=0.56, the balance is Fe and other trace elements. The production process steps include:

[0023] Rolling process: After the slab is heated by the heating furnace, the tapping temperature is 1225°C, and the soaking time is 36 minutes. Above 22%, the finishing rolling temperature is 845~870°C, rolled into a steel plate with a thickness of 11mm, and then rapidly cooled to 738~762°C, straightened by a pre-leveler and a hot straightener, and air-cooled on a cooling bed. Cold straightening is carried out again before the steel plate goes offline for stacking.

[0024] Quenching and tempering process: After three times of straightening, the steel plate is subjected to quenching and tempering treatment. The quenching heating tem...

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Abstract

The invention discloses a production method of high straightness super-strength steel. A steel production process route comprises the following steps: pretreatment of molten iron, converter smelting,LF external refining, VD vacuum treatment, continuous casting, heating, rolling, straightening, quenching, tempering, finishing, performance inspection, and flaw detection. The high straightness super-strength steel is characterized by being prepared from the following chemical components in percentage: 0.15 to 0.20 percent of C, 0.15 to 0.35 percent of Si, 1.0 to 1.50 percent of Mn, smaller thanor equal to 0.012 percent of P, smaller than or equal to 0.003 percent of S, 0.010 to 0.030 percent of Nb, 0.015 to 0.040 percent of V, 0.010 to 0.025 percent of Ti, 0.020 to 0.045 percent of Als, 0.040 to 0.60 percent of Cr, 0.10 to 0.30 percent of Mo, 0.20 to 0.50 percent of Ni, 0.0008 to 0.0025 percent of B, smaller than or equal to 0.60 percent of CEV and the balance of Fe and inevitable impurities. The super-strength steel has the characteristics that the production thickness is 6 to 25 mm, the width is 1,500 to 3,800 mm, the yield strength of a steel plate is greater than or equal to 1,100 MPa, the tensile strength is greater than or equal to 1,200 MPa, the elongation percentage is greater than or equal to 11 percent, the impact work at -40 DEG C below zero is greater than or equal to 50 J and the straightness in any direction of the steel plate is smaller than or equal to 3 mm/m.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a production method of super high-strength steel with high flatness and yield strength of 1100MPa. Background technique [0002] In order to meet the manufacturing needs of large-scale and long-span components, save resources and meet the requirements of environmental protection, construction machinery equipment is developing towards lightweight, and ultra-high-strength steel with a yield strength greater than 1100MPa is used in key components of construction machinery (such as crane booms, etc.) widely used. At present, the application thickness specification is mainly 4-25mm, and the production process is mostly TMCP+quenching+low temperature. The tempered material structure is mainly tempered martensite, and the residual stress is large. Due to the high strength of the steel plate, it is difficult to control the shape of the plate, and the performance is uneve...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/48C22C38/46C22C38/50C22C38/06C22C38/44C22C38/54C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 张青学罗登刘丹周文浩高擎彭宁琦汪贺模
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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