Which Is Better, Stainless Steel Screws Or Galvanized Screws?
Should I choose stainless steel screws or galvanized screws? This is a choice that needs to be made based on the actual situation of your project, as stainless steel screws are much more expensive than galvanized screws.
If the project is an indoor project or a temporary outdoor project, we recommend galvanized screws because they are cheap and affordable.
Or the project is a long-term outdoor projects or projects in harsh environments, such as stainless steel chemical piping or photovoltaic mounts, these are used for decades, we recommend the use of stainless steel screws.
Because the one-time installation can be used safely for a long time. For such projects, the use of stainless steel screws to the overall cost is smaller than carbon steel.
Stainless steel screws and galvanized screws are two common screw materials, and they differ in the following ways:
Different Materials Between Stainless Steel And Carbon Steel
Stainless steel screws are made of stainless steel material, due to the stainless steel material contains chromium and nickel, and even add molybdenum element, so make the stainless steel screws have excellent corrosion resistance
Galvanized screws are carbon steel after cold heading into the screw surface treatment, plated with a layer of zinc, can improve the corrosion resistance of the screws.
Appearance Is Different
18-8 Screws generally present silver-white, because stainless steel screws are made of stainless steel, the color is close to the original color of iron, with a good surface finish, beautiful color, beautiful appearance, to meet certain appearance requirements.
The original color of stainless steel bolts with iron luster, originating from its alloy composition, gives a low-profile and durable impression.
Galvanized screws, on the other hand, are covered with a layer of zinc, which can be white, colored or black, depending on the type of galvanization. The appearance is relatively poor.
Stainless Screws And Galvanized Screws Strength Differences
Galvanized screws are available in a variety of grades, and the different grades of screws have a variety of different tensile strengths. Of course, different materials of stainless steel screws also have different tensile strength.
For example, the tensile strength of galvanized screws grade 5.8 is greater than 500MPA galvanized screws grade 8.8 tensile strength is greater than 800MPA, while the tensile strength of 304 stainless steel screws A2-70 is greater than 700MPA, 316 stainless steel screws A4-80 strength is greater than 800MPA.
So according to the facts, can not say that the strength of stainless steel screws is better than galvanized screws. But in the environment of high temperature and high pressure, the surface of stainless steel screws is better than galvanized screws. And have better toughness and wear resistance.
Corrosion Resistance Is Different
A2 or A4 SS screws have very good corrosion resistance, not easy to be strong acid and alkali corrosion, can be used in harsh environments for a long time; so that in the humid and acidic and alkaline environments are also very good performance.
SS screws are more resistant to corrosion and high temperature, with good corrosion resistance and durability, suitable for outdoor, chemical, mechanical and other harsh environments.
Zinc Plated screws, here refer to electro-galvanized screws, the surface is coated with a layer of zinc, with a certain degree of corrosion resistance, but its corrosion resistance is relatively low, especially when the installation, galvanized easy to damage, damage or breakage of the part of the environment is susceptible to moisture, acid and alkali erosion, will be from the point of the surface of the phenomenon of rust and corrosion.
Galvanized screws are usually used only in dry environments, such as furniture and decoration.
The Price Difference
Generally speaking, the price of stainless steel screws is higher than galvanized screws. Because the cost of stainless steel material is higher than galvanized material.
And the toughness of stainless steel material is relatively high, so it is more difficult to process than carbon steel, so the production and processing costs are higher, and the processing technology is more complex, so the price of stainless steel screws will be higher.
The price of stainless steel screws is relatively high, but because of its good corrosion resistance, long life and other advantages, is widely used in special areas, such as medical, chemical, etc.; and zinc-plated screws are relatively low in price, applicable to general industrial and civil areas.
Use Of The Environment
Stainless steel screws are suitable for long-term wet environment, often washed by water or rain, while galvanized screws are generally used in ordinary dry environment. In humid environments, galvanized screws are prone to rusting, so they are not suitable for equipment that is exposed for long periods of time.
Although galvanized bolts are suitable for dry environments, stainless steel bolts are more durable in the face of wet, corrosive environments such as long-term outdoor exposure and inside transformers (the corrosion resistance of stainless steel bolts makes them perform better under extreme conditions).
Whether it is petroleum, chemical, construction or bridges, textile printing and dyeing, machinery and hardware, medical, decorative and even shipbuilding, stainless steel and galvanized fasteners play an indispensable role in their respective fields (a wide range of industries, providing a variety of facilities with critical connections).
In addition to this, galvanized screws and stainless steel screws produce different results and degrees of applicability when faced with different use environments and tasks. Therefore, the choice needs to be made according to the specific circumstances.
In summary, this article compares the difference between galvanized screws and stainless steel screws in detail, and analyzes and analyzes the material, corrosion resistance, strength and price. In the purchase and use should be selected according to the specific circumstances.
If you still have questions about which screws to use, please contact our experts. Our specialists will give you rationalized advice for your type of project.
We will respond to any questions you may have about fasteners within 24 hours.
Contact the Experts
- Ding Fasteners
- N0.52 Qinfen Rd, Haiyan Zhejiang China
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- +86-573-86221432