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A kind of metal material and its preparation method and steel structure

A technology for 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, poor toughness, etc., and achieve the effects of good affinity and adhesion, high strength and toughness

Active Publication Date: 2022-02-18
HANGZHOU STAN NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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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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  • A kind of metal material and its preparation method and steel structure
  • A kind of metal material and its preparation method and steel structure
  • A kind of metal material and its preparation method and steel structure

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 zero-resistance current and potential screw pair galvanic couple test method can also be used to evaluate the electrochemical corrosion performanc...

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Abstract

The invention discloses a metal material, a preparation method thereof, and a steel structure. The chemical components included in the metal material and their weight percentages are: C: 0.08-0.4%; Si: 0.10-0.80%; Mn: 0.20~1.8%; Ni: 0.12~3.0%; Cu: 0.10~0.60%; Cr: 0.30~1.25%; Al: 0.015~1.8%; V: 0.009~0.019%; Fe and unavoidable impurities. The metal material of the invention significantly improves the toughness, strength, axial fatigue resistance, crystal density and the like of the steel. The surface of the steel can penetrate into the alloy to form a coating to prevent electrochemical corrosion when the steel structure is connected to other metal components. It has strong coating adhesion and can balance the brittleness caused by adding copper to the steel, so that the steel is corrosion-resistant. In terms of performance, the amount of nickel, chromium and molybdenum is reduced. In order to infiltrate the surface of the steel into the alloy to form a coating and have strong coating adhesion, and considering the economy of the material and the better balance between the addition of vanadium, aluminum, copper, nickel and chromium, 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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Patent Type & Authority Patents(China)
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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