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Large-thickness high-toughness steel plate and production method thereof

A production method and high toughness technology, applied in the field of metal materials, can solve the problems of high production cost, long process flow and low yield, and achieve the effects of high cost, uniform cooling and high yield.

Active Publication Date: 2020-06-19
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of low yield rate of traditional die casting, long post-rolling heat treatment process and high production cost.

Method used

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  • Large-thickness high-toughness steel plate and production method thereof
  • Large-thickness high-toughness steel plate and production method thereof
  • Large-thickness high-toughness steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A steel plate with large thickness and high toughness, its chemical composition mass percent is: C 0.06%, Si 0.07%, Mn 1.45%, P 0.009%, S 0.003%, Nb 0.043%, Ti 0.016%, Cr 0.22%, Ni 0.08 %, Cu0.18%, Alt 0.035%, N 0.0034%, the rest are iron and unavoidable impurities, Cr×7≤Mn+Cr≤(Mn+Cr+Ni+Cu)×0.9, Cu / Ni=2.3. The specific steps and parameters of the above-mentioned steel plate production method are as follows:

[0054] After blast furnace ironmaking→hot metal pretreatment→converter steelmaking→LF refining→RH vacuum degassing→protective pouring continuous casting, a 320mm thick continuous casting slab is produced, with center segregation of B class 0.5, without center looseness, cracks, bubbles and other defects.

[0055] The continuous casting slab is heated in a walking heating furnace, the temperature in the soaking section is 1140±10°C, and the time in the furnace is 423 minutes. After rough phosphorus removal, two-stage controlled rolling is carried out, the work roll...

Embodiment 2

[0061] A large-thickness high-toughness steel plate, its chemical composition mass percent is: C 0.05%, Si 0.06%, Mn 1.50%, P 0.008%, S 0.004%, Nb 0.042%, Ti 0.013%, Cr 0.24%, Ni 0.12 %, Cu0.22%, Alt 0.029%, N 0.0039%, the rest are iron and unavoidable impurities, Cr×7≤Mn+Cr≤(Mn+Cr+Ni+Cu)×0.9, Cu / Ni=1.8. The specific steps and parameters of the above-mentioned steel plate production method are as follows:

[0062] After blast furnace ironmaking→hot metal pretreatment→converter steelmaking→LF refining→RH vacuum degassing→protective pouring continuous casting, a 320mm thick continuous casting slab is produced, with center segregation C class 1.0, without center looseness, cracks, bubbles and other defects.

[0063] The continuous casting slab is heated in a walking heating furnace, the temperature in the soaking section is 1130±10°C, and the time in the furnace is 512min. After coarse phosphorus removal, two-stage controlled rolling is carried out, the work rolls are flat rolls...

Embodiment 3

[0069] A large-thickness high-toughness steel plate, its chemical composition mass percent is: C 0.04%, Si 0.08%, Mn 1.55%, P 0.010%, S 0.005%, Nb 0.046%, Ti 0.015%, Cr 0.25%, Ni 0.11 %, Cu0.24%, Alt 0.041%, N 0.0042%, the rest are iron and unavoidable impurities, Cr×7≤Mn+Cr≤(Mn+Cr+Ni+Cu)×0.9, Cu / Ni=2.2. The specific steps and parameters of the above-mentioned steel plate production method are as follows:

[0070] After blast furnace ironmaking→hot metal pretreatment→converter steelmaking→LF refining→RH vacuum degassing→protective pouring continuous casting, a 320mm thick continuous casting slab is produced, with center segregation B class 1.0, without center looseness, cracks, bubbles and other defects.

[0071] The continuous casting slab is heated in a walking heating furnace, the temperature in the soaking section is 1125±15°C, and the time in the furnace is 518min. After coarse phosphorus removal, two-stage controlled rolling is carried out, the work rolls are flat rolls...

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Abstract

The invention relates to a large-thickness high-toughness steel plate and a production method thereof. The large-thickness high-toughness steel plate comprises the chemical composition, by mass: C: 0.03-0.07%, Si <= 0.10%, Mn: 1.40-1.60%, P <= 0.015%, S <= 0.010%, Nb: 0.040- 0.050%, Ti: 0.010-0.020%, Cr: 0.20-0.30%, Ni: 0.05-0.15%, Cu: 0.15-0.25%, Alt: 0.020-0.050%, N <= 0.005% and the balance iron and inevitable impurities, and meanwhile the formulas: Cr*7 <= Mn + Cr <= (Mn + Cr + Ni + Cu) * 0.9 and 1.8 <= Cu / Ni <= 2.8 are met. Through reasonable component design and a TMCP controlled rollingand controlled cooling process in a matched mode, the prepared steel plate is good in mechanical property and welding property and wide in application field.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a large-thickness high-toughness steel plate with a yield strength of 460 MPa, excellent low-temperature (-60°C) toughness, Z-direction tear resistance, good plate shape, and a thickness ≥ 110 mm, and its production method. Background technique [0002] Large-thickness and high-toughness steel plates are widely used in fields such as offshore platforms, shipbuilding, high-rise buildings, water conservancy, bridges, mechanical molds, and pressure vessels that require high performance of steel plates. Due to the plate thickness, the uniformity of mechanical properties in the thickness direction is difficult to control, and the quality of the core is difficult to guarantee. In order to ensure the uniformity of mechanical properties in the thickness direction, the conventional method is to adopt subsequent quenching and tempering or normalizing heat treatment process; in order to ensu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/58C21D8/02
CPCC21D8/0226C21D2211/002C21D2211/005C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/58
Inventor 陆春洁镇凡杨浩曲锦波
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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