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Weldable fine grain structural steel S355NL/S355NLZ35 steel plate and its production method

A production method and technology of structural steel, applied in the direction of manufacturing converters, workpiece surface treatment equipment, metal rolling, etc., can solve problems such as increased production costs, unfavorable enterprise development and competition, increased production energy consumption, etc., to reduce production cost effect

Inactive Publication Date: 2012-02-08
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the known technology, the traditional S355NL / S355NLZ35 steel plate production needs to be normalized, which increases the production energy consumption and production cost, which is very unfavorable to the development and competition of enterprises

Method used

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  • Weldable fine grain structural steel S355NL/S355NLZ35 steel plate and its production method

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Experimental program
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Effect test

Embodiment 1

[0023]Through KR molten iron pretreatment, converter smelting, argon blowing treatment, LF refining, VD refining, continuous casting, heating, controlled rolling and controlled cooling, stack cooling, and normalizing processes, a weldable fine-grain structural steel S355NL / S355NLZ35 steel plate is obtained , it contains the following chemical composition in mass percent (unit, wt%): C: 0.16, Si: 0.35, Mn: 1.40, P: 0.015, S: 0.003, Als: 0.025, V: 0.025, Ti: 0.020, others are Fe and residual elements.

Embodiment 2

[0025] Through KR molten iron pretreatment, converter smelting, argon blowing treatment, LF refining, VD refining, continuous casting, heating, controlled rolling and controlled cooling, stack cooling, and normalizing processes, a weldable fine-grain structural steel S355NL / S355NLZ35 steel plate is obtained , it contains the following chemical composition in mass percent (unit, wt%): C: 0.12, Si: 0.43, Mn: 1.20, P: 0.017, S: 0.001, Als: 0.040, V: 0.015, Ti: 0.025, others are Fe and residual elements.

[0026] Analysis of mechanical properties

[0027] The composition and mechanical properties shall be implemented according to EN10025-1, and the specific mechanical properties are shown in Table 1 below

[0028] Table 1 Mechanical properties of weldable fine grain structural steel S355NL / S355NLZ35 steel plate

[0029]

[0030] A total of 120 batches of weldable fine-grained structural steel S355NL / S355NLZ35 steel plates with a thickness of 20-80 mm were trial-produced, amon...

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Abstract

The invention discloses a weldable fine grain structural steel S355NL / S355NLZ35 steel plate, which comprises the following chemical components by wt%: 0.10-0.18of C, 0.20-0.45 of Si, 1.20-1.45 of Mn, less than or equal to 0.018 of P, less than or equal to 0.005 of S, 0.015-0.050 of Als, 0.010-0.055 of V, 0.005-0.025 of Ti, and the balance Fe and residual elements. The production method consists of: KR molten iron pretreatment, converter smelting, argon blowing treatment, LF (ladle furnace) refining, VD (vacuum degassing) refining, continuous casting, heating, controlled rolling and controlled cooling, stack cooling, and normalizing. According to the invention, content and proportion of C, Mn and Nb alloy elements are adjusted properly, and content of harmful elements in steel like P and S etc. influencing the plasticity and toughness of the steel plate is strictly controlled, and meanwhile, the heating system of steel rolling is strictly controlled. The rolling process employs a mode of lowering finish rolling temperature, speeding up cooling after rolling, and conducting steel plate stacking and slowing cooling after rolling, thus guaranteeing all performance indexes of the weldable fine grain structural steel S355NL / S355NLZ35 steel plate meeting the standard requirements.

Description

[0001] technical field [0002] The invention belongs to the technical field of medium and heavy plate production, and in particular relates to a weldable fine-grain structural steel S355NL / S355NLZ35 steel plate and a production method thereof. Background technique [0003] In the known technology, the traditional S355NL / S355NLZ35 steel plate production needs to be normalized, which increases the production energy consumption and production cost, which is very unfavorable to the development and competition of enterprises. Contents of the invention [0004] In view of the above problems, the present invention provides a weldable fine-grain structural steel S355NL / S355NLZ35 steel plate with low cost and easy production and a production method thereof. [0005] A weldable fine-grain structural steel S355NL / S355NLZ35 steel plate, comprising the following chemical composition in mass percentage (unit, wt%): C: 0.10-0.18, Si: 0.20-0.45, Mn: 1.20-1.45, P≤0.018, S≤0.005, Als: 0.0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21C1/02C21C5/28C21C7/072C21C7/10B22D11/18B22D11/22C21D1/28B21B37/74B21B45/02
Inventor 朱书成高照海许少普张立新崔冠军李忠波袁永旗于飒李亮亮刘庆波赵迪贾涛张强
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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