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Preparation method for steel riveted joint material

A technology of a riveted head and a manufacturing method, applied in the field of steel materials, can solve problems such as affecting the safety of use, easy splitting, cracking or breaking, and achieve the effects of low deformation resistance, moderate strength and good plasticity

Inactive Publication Date: 2013-12-11
ANHUI YUANXUN AUTOMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current fastener materials mostly use cold heading steel, and now cold riveting steel is easy to split, crack or break during cold heading, which affects the safety of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] A method for manufacturing cold heading steel materials for riveted joints, including melting, oxidation, detection and adjustment of alloy components, refining, casting, hot rolling, and heat treatment. The weight percentages of the chemical elements are: carbon 0.15-0.35, chromium 0.3-0.4 , Vanadium 0.6-0.7, Manganese 1.2-1.3, Molybdenum 0.04-0.06, Silicon 0.5-0.6, Sulfur 0.01-0.03, Phosphorus 0.01-0.02, Nickel 0.2-0.3, Copper 0.8-0.9, Pr0.02-0.04, As0.05 -0.08, Hf0.08-0.12, the balance is iron.

[0008] Heat treatment means: the casting is heated up to 420-445°C at a rate of 160-180°C / hour, and kept at a temperature of 4-6 hours; then, it is cooled to room temperature at a rate of 55-75°C / hour; stored for 3-4 hours; -170°C / hour to 520-550°C, keep warm for 3-4 hours; then cool down to 360-380°C at 80-00°C / hour, keep warm for 2-3 hours; then 80-90°C / hour Raise the temperature to 980-1020°C and keep it warm for 4-5 hours; then cool it down to 260-320°C at a rate of 60-...

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PUM

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Abstract

The invention provides a preparation method for a cold heading steel material used for a riveted joint. The preparation method comprises the following steps: fusing; oxidation; detection of alloy components and adjustment; refining; casting; hot rolling; and heat treatment. The material is characterized by comprising the following chemical elements by weight: 0.15 to 0.35% of C, 0.3 to 0.4% of Cr, 0.6 to 0.7% of V, 1.2 to 1.3% of Mn, 0.04 to 0.06% of Mo, 0.5 to 0.6% of Si, 0.01 to 0.03% of S, 0.01 to 0.02% of P, 0.2 to 0.3% of Ni, 0.8 to 0.9% of Cu, 0.02 to 0.04% of Pr, 0.05 to 0.08% of As and 0.08 to 0.12% of Hf, with the balance being Fe. The cold heading steel material prepared in the invention has moderate strength and good plasticity, and a fastener has low resistance to deformation and does not crack during cold heading and molding and meets requirements for grade-8.8 fasteners.

Description

technical field [0001] The invention relates to a steel material, in particular to a preparation method of a steel riveting head material. Background technique [0002] Fasteners are a type of mechanical parts that are used for fastening connections and are widely used. All kinds of fasteners can be seen on various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters and supplies. Fasteners are the basic parts of the mechanical industry and are in great demand. Fasteners include various bolts, riveted joints, nuts, rivets, etc. Since fasteners are used to connect various structural materials, they need to withstand a lot of pressure, Shear force. The current fastener materials are mostly cold heading steel, and now cold riveting steel is easy to split, crack or break during cold heading, which affects the safety of use. Contents of the invention [0003] The purpose of the present invention is to provide a preparati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/46C21D6/00
Inventor 张志张信群唐小兵邵军王元军
Owner ANHUI YUANXUN AUTOMATION SCI & TECH