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100-150mm alloy structural steel 4140 thick plate and production technique thereof

A technology of alloy structural steel and production method, which is applied in the field of medium-thick steel plate production, can solve the problems of steel plate performance, hardness and use requirements not meeting the target, difficulty in the production process of thickness alloy structural steel, and inconvenient processing and use by customers, etc., to achieve original Good organization, avoiding excessive grain growth, and minimizing residual stress

Active Publication Date: 2014-04-16
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the known technology, the production process of alloy structural steel with a thickness of more than 100mm is difficult. If the process is not properly controlled, it is easy to cause cracking and scrapping of the steel plate, and the performance, hardness and use requirements of the steel plate cannot meet the indicators, which brings inconvenience to customers.

Method used

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  • 100-150mm alloy structural steel 4140 thick plate and production technique thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Through KR molten iron pretreatment, converter smelting, argon blowing treatment, LF refining, VD refining, die casting, ingot slow cooling, steel ingot cleaning, heating, controlled rolling, stack cooling, heat treatment, and slow cooling processes, a 100-150mm alloy is obtained Structural steel 4140 thick plate, which contains the following chemical composition in mass percentage (unit, wt%): C: 0.39, Si: 0.20, Mn: 0.85, P: 0.010, S: 0.003, Als: 0.02, Cr: 0.9, Mo : 0.17, others are Fe and residual elements.

Embodiment 2

[0027] Through KR molten iron pretreatment, converter smelting, argon blowing treatment, LF refining, VD refining, die casting, ingot slow cooling, steel ingot cleaning, heating, controlled rolling, stack cooling, heat treatment, and slow cooling processes, a 100-150mm alloy is obtained Structural steel 4140 thick plate, which contains the following chemical composition in mass percentage (unit, wt%): C: 0.42, Si: 0.30, Mn: 0.95, P: 0.008, S: 0.002, Als: 0.04, Cr: 1.0, Mo : 0.23, others are Fe and residual elements.

[0028] Analysis of mechanical properties

[0029] The composition and mechanical properties are implemented in accordance with ASTMA29 / A29M-4, and the specific mechanical properties are shown in the table below.

[0030] Mechanical Properties of 100-150mm Alloy Structural Steel 4140 Thick Plate

[0031]

[0032] The trial production of 100-150mm thick 4140 has a total of 10 batches, of which: the yield strength is controlled at 950-980MPa, an average of 970M...

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Abstract

The invention discloses a 100-150mm alloy structural steel 4140 thick plate and a production technique thereof. The 100-150mm alloy structural steel 4140 thick plate comprises the following chemical components in percentage by mass: 0.39-0.42% of C, 0.20-0.30% of Si, 0.85-0.95% of Mn, at most 0.010% of P, at most 0.003% of S, 0.020-0.040% of Als, 0.9-1.0% of Cr, 0.17-0.23% of Mo, and the balance of Fe and residual elements. KR molten iron pretreatment, converter smelting, argon blowing, LF (ladle furnace) refining, VD (vacuum degasser) refining, die casting, steel ingot slow cooling, steel ingot conditioning, heating, controlled rolling, cooling in pile, heat treatment and slow cooling are utilized to strictly control the contents of P, S and other harmful elements capable of influencing the plasticity and toughness of the steel plate, thereby ensuring the minimized internal residual stress of the 4140-grade 100-150mm-thick steel plate; and the internal quality is acceptable, and various performance indexes satisfy the standard requirements. The reasonable quenching and tempering technique is utilized to ensure that various properties of the 4140 steel plate satisfy the requirements.

Description

technical field [0001] The invention belongs to the technical field of medium-thick steel plate production, and in particular relates to a 100-150mm alloy structural steel 4140 thick plate and a production method thereof. Background technique [0002] In the known technology, the production process of alloy structural steel with a thickness of more than 100mm is difficult. If the process is not properly controlled, it is easy to cause cracking and scrapping of the steel plate, and the performance, hardness and use requirements of the steel plate cannot meet the indicators, which brings inconvenience to customers for processing and use. Contents of the invention [0003] In view of the above problems, the purpose of the present invention is to provide a 100-150mm thickness alloy structural steel 4140 thick plate and its production method which are easy to produce and widely used. [0004] A 100-150mm alloy structural steel 4140 thick plate, containing the following chemical...

Claims

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Application Information

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IPC IPC(8): C22C38/22C22C38/14C21D8/02
Inventor 朱书成李亮亮许少普康文举杨东
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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