Metal material and preparation method thereof as well as steel structural member

A technology of metal materials and steel structural parts, applied in the field of metal materials and their preparation, can solve the problems of electrochemical corrosion, short corrosion resistance life, large amount of electrochemical corrosion, etc., and achieve good affinity and adhesion, high strength and toughness Effect

Active Publication Date: 2021-01-01
HANGZHOU STAN NEW MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing technology, stainless steel has good high temperature resistance and corrosion resistance, but after cold hardening, the toughness is poor. In addition, nickel and chromium dense oxide crystal layers will be formed on the surface of stainless steel, which cannot be formed by infiltrating surface alloys. Surface coating, which causes electrochemical corrosion when stainless steel components are connected with other metal material components, especially when connecting with more active metal material components such as aluminum alloy, it will cause these more active metal material components. The amount of chemical corrosion is large; when the strength of carbon steel is increased, the toughness is poor, it is easy to crack, and the corrosion resistance of carbon steel is poor. Although the surface of carbon steel can be treated with galvanized, aluminum-plated, copper-plated, etc. The corrosion resistance life is short, and the adhesion of the coating is poor

Method used

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  • Metal material and preparation method thereof as well as steel structural member
  • Metal material and preparation method thereof as well as steel structural member
  • Metal material and preparation method thereof as well as steel structural member

Examples

Experimental program
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Effect test

example 1

[0060] Design and calculation of electrochemical galvanic corrosion amount of bolts made of a metal material in this embodiment, wherein the test piece is an M8 screw (surface zinc alloy) made of a metal material of group II C, which is combined with a 5mm aluminum plate The threaded connection forms a threaded pair. In the design of the thread pair, the service life of the thread height K after galvanic corrosion Cl should be satisfied, K l Take 50 years (building design life is 50 years, 70 years, 100 years), η takes 1.2, γ q Take 1.4, M8 thread height takes 0.6mm, the calculation is as follows:

[0061] K Cl =K CO -K C ·K l ·Δ / η

[0062] min=K Cl / K CO ≥0.9

[0063] K Cl =0.6mm-[0.00000096×50×2 / 1.2]

[0064] =0.6mm-0.00008

[0065] =0.59992mm

[0066] min=0.59992÷0.6

[0067] =0.9999≥0.9, so the thread height meets the design requirements!

[0068] In the formula:

[0069] K Cl ——Thread design age; thread height after galvanic corrosion;

[0070] K CO ——...

example 2

[0087] Design calculation of electrochemical galvanic corrosion amount of 304 stainless steel screws after surface passivation treatment using the formula in Example 1, K l Take 50 years, η takes 1.2, γ q Take 1.4, M8 thread height takes 0.6mm, and carry out design checking:

[0088] K Cl =K CO -K C ·K l ·Δ / η

[0089] min=K Cl / K CO ≥0.9

[0090] K Cl =0.6mm-[0.002×50×2×1.2]

[0091] =0.6mm-0.24mm

[0092] =0.36mm

[0093] min=0.36÷0.6≥0.9

[0094] =0.6<0.9, so the thread height does not meet the design requirements!

[0095] Substitute into the above formula:

[0096]

example 3

[0098] Design calculation of electrochemical galvanic corrosion amount of 316 stainless steel screws after surface passivation treatment using the formula in Example 1, K l Take 50 years, η takes 1.2, γ q Take 1.4, M8 thread height takes 0.6mm, and carry out design checking:

[0099] K Cl = K CO -K C ·K l ·Δ / η

[0100] min=K Cl / K CO ≥0.9

[0101] K Cl =0.6mm-[0.0027×50×2×1.2]

[0102] =0.6mm-0.324mm

[0103] =0.276mm

[0104] min=0.276÷0.6≥0.9

[0105] =0.46<0.9, so the thread height does not meet the design requirements!

[0106] Substitute into the above formula:

[0107]

[0108] To sum up, the screws made of metal materials in group II C, after the surface is infiltrated with zinc alloy, have good performance in preventing electrochemical corrosion and have a longer service life.

[0109] In this embodiment, the electrochemical corrosion performance of the screw made of the metal material of this embodiment can also be evaluated by using the zero-resistanc...

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Abstract

The invention discloses a metal material and a preparation method thereof as well as a steel structural member. The metal material comprises the following chemical components in percentage by weight:0.08-0.4% of C, 0.10-0.80% of Si, 0.20-1.8% of Mn, 0.12-3.0% of Ni, 0.10-0.60% of Cu, 0.30-1.25% of Cr, 0.015-1.8% of Al, 0.009-0.019% of V, Fe and unavoidable impurities. According to the metal material disclosed by the invention, the toughness, strength, axial fatigue resistance, crystal density and the like of steel are obviously improved. Alloy can permeate into the surface of the steel to form a plating layer, so that electrochemical corrosion is prevented from occurring when the steel structural member is connected to other metal components, higher plating layer adhesion force is achieved, the brittleness problem caused by adding copper into the steel can be balanced, and the use amount of nickel, chromium and molybdenum is reduced on the aspect of corrosion resistance of the steel.In order to achieve the purposes that the alloy permeates into the surface of the steel to form the plating layer and the plating layer adhesion force is high, the economical efficiency of the material and the good balance point between the addition of vanadium and the adding amount of aluminum, copper, nickel and chromium are considered at the same time, and the content of vanadium is 0.009-0.019%.

Description

technical field [0001] The invention relates to a metal material, a preparation method thereof, and a steel structure made of the metal material. Background technique [0002] In the existing technology, stainless steel has good high temperature resistance and corrosion resistance, but after cold hardening, the toughness is poor. In addition, nickel and chromium dense oxide crystal layers will be formed on the surface of stainless steel, which cannot be formed by infiltrating surface alloys. Surface coating, which causes electrochemical corrosion when stainless steel components are connected with other metal material components, especially when connecting with more active metal material components such as aluminum alloy, it will cause these more active metal material components. The amount of chemical corrosion is large; when the strength of carbon steel is increased, the toughness is poor, it is easy to crack, and the corrosion resistance of carbon steel is poor. Although t...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C21C7/06
CPCC22C38/58C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C21C7/06
Inventor 徐跃华徐洁媛徐洁莉
Owner HANGZHOU STAN NEW MATERIALS TECH CO LTD
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