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4.8-grade corrosion-resistant cold forging steel and production method thereof

A production method and technology of cold heading steel, applied in the field of cold heading steel, can solve the problems of less research work and low production cost of weather-resistant cold heading steel, reduce the risk of nodulation of molten steel, improve corrosion resistance, and shorten the solidification time Effect

Active Publication Date: 2022-02-18
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there have been extensive researches on corrosion-resistant materials for bridge plates and iron frame profiles in China, but for weather-resistant cold heading steel used for the production of fasteners There is still little research work. For the weather-resistant bolts used as connecting parts, in addition to the conventional mechanical properties, their corrosion resistance needs to be studied in order to be suitable for various environments. Therefore, it is necessary to design a corrosion-resistant bolt with excellent corrosion resistance and The production cost of cold heading steel and its production method is the goal that the industry has been pursuing

Method used

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  • 4.8-grade corrosion-resistant cold forging steel and production method thereof
  • 4.8-grade corrosion-resistant cold forging steel and production method thereof

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Embodiment 1

[0037] like figure 1 As shown, a 4.8-stage corrosion-resistant steel-resistant steel, including the following weight percentage of chemical components: C: 0.03%, Si: 0.15%, Mn: 0.50%, Alt: 0.030%, LA: 0.006%, CE : 0.012%, YB: 0.008%, P: 0.012%, S: 0.003%, the rest is Fe and other inevitable impurities. Different from the traditional addition of Cu, Cr, Ni precious alloy elements, the present invention can effectively reduce the manufacturing cost of the steel by adding low-cost LA, CE, YB rare earth elements. In the industrial atmospheric environment, YB can make MNS, A1 in steel 2 O 3 The like is mixed into spherical rare earth composite oxide, and the strong toughness of steel is improved by dispassion. YB, CE, LA is also enriched in the rust layer of steel, forming a form of elliptical complex (see figure 1 ), The size is 30 nm to 100 nm, which reduces the critical current density of the activated peak, and then reducing the active dissolution rate of the steel matrix, and its ...

Embodiment 2

[0053] The 4.8-stage corrosion-resistant cold press steel is maintained in accordance with Example 1, and the present embodiment includes the following weight percent chemical components: C: 0.07%, Si: 0.17%, Mn: 0.20%, Alt: 0.020%, LA: 0.01%, CE: 0.008%, YB: 0.009%, P: 0.013%, S: 0.002%, the rest is FE and other inevitable impurities.

[0054] The corrosion resistance index I of the 4.8-stage corrosion-resistant crossed steel of the present embodiment is 0.16, and the steel flow fluidity index L is 0.031.

[0055] The production method of the 4.8-stage corrosion resistant steel steel, including the following production steps: iron water pretreatment → steel water smelting → LF furnace refining → Square-billet cast → billet heating → wire rolling → Steymo Cooling wire cooling → φ 5.5 ~ 30mm wire strip finished product. It is pretreated with desulfurization, the desulfurization target value s ≤ 0.006%. The end of the steel smelting step control C is 0.02%, P is 0.005%, and the whit...

Embodiment 3

[0059] The 4.8-stage corrosion-resistant refurbished steel of the present embodiment is substantially consistent with the first embodiment, and the present embodiment includes the following weight percent chemical components: C: 0.04%, Si: 0.30%, Mn: 0.45%, Alt: 0.029%, LA: 0.012%, CE: 0.006%, YB: 0.01%, P: 0.011%, S: 0.003%, and the rest is Fe and other inevitable impurities.

[0060] The resistance index I of the 4.8-stage corrosion-resistant crossed steel of the present embodiment is 0.21, and the steel fluidity index L is 0.032.

[0061]The production method of the 4.8-stage corrosion resistant steel steel, including the following production steps: iron water pretreatment → steel water smelting → LF furnace refining → Square-billet cast → billet heating → wire rolling → Steymo Cooling wire cooling → φ 5.5 ~ 30mm wire strip finished product. It is pretreated with desulfurization, the desulfurization target value s ≤ 0.006%. The end of the steel smelting step control C is 0.04%,...

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Abstract

The invention discloses 4.8-grade corrosion-resistant cold forging steel and a production method thereof, and belongs to the technical field of acid-corrosion-resistant steel bar production. The 4.8-grade corrosion-resistant cold forging steel comprises the following chemical components in percentage by weight: 0.03%-0.07% of C, 0.15%-0.30% of Si, 0.20%-0.50% of Mn, 0.020%-0.030% of Alt, 0.006%-0.012% of La, 0.006%-0.012% of Ce, 0.005%-0.010% of Yb, less than or equal to 0.015% of P, less than or equal to 0.015% of S, and the balance of Fe and other inevitable impurities. In order to solve the problems existing in the prior art, the invention provides the 4.8-grade corrosion-resistant cold forging steel and the production method thereof, the cold forging steel with excellent corrosion resistance is obtained through utilizing the specific chemical component proportion and the production method, the cold forging steel is suitable for manufacturing 4.8-grade fasteners resistant to industrial atmospheric environment corrosion, and the steel preparation cost is low.

Description

Technical field [0001] The present invention belongs to the technical field of cold heading steel, and more particularly to a 4.8-stage corrosion-resistant cold heading steel and its production method. Background technique [0002] Cold head steel is mainly used for the production of fasteners such as bolts, screws, nuts. my country's railway construction maintains rapid development, providing market space for fasteners. China's region is vast, natural climate environment is complicated, with the development of rail transit, put forward higher requirements for its fasteners, urgently needs to develop cold steel materials with excellent corrosion resistance, my country Wind power, bridge The fields are also urgently demand for fasteners with high weather resistance. [0003] At present, the corrosion resistance of the bridge for bridges, iron frame profiles have been widely studied, but for the research work for the production of finely refurbished steel, the research work is less...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06B22D11/11B22D11/115B22D11/117C22C33/04C22C38/00C21D8/06
CPCC22C38/02C22C38/04C22C38/06C22C38/005C22C33/04B22D11/115B22D11/117B22D11/11C21D8/065C21D2211/005C21D2211/009Y02P10/20
Inventor 姜婷汪开忠于同仁张晓瑞郭湛龚梦强余良其孙凯王忠乐
Owner MAANSHAN IRON & STEEL CO LTD
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