Screws are the core fasteners for ensuring the stability of connection structures. Among many products, stainless steel screws and galvanized screws are the two mainstream types. With their different material properties and processing techniques, they show unique performance advantages in different application scenarios. This article will compare the two in detail to help you choose the fastener that suits you more accurately.
Materials and Processes Comparison
Galvanized screws use a variety of process types, including colored electro-galvanizing, such as white, blue, yellow, and hot-dip galvanizing. These processes will build a protective barrier on the surface of metal steel, effectively blocking the intrusion of air and moisture. Thereby effectively preventing the screw from rusting and corroding. Among them, the thickness of the galvanized layer is directly related to the anti-corrosion performance, and the electro-galvanized layer is relatively thin. If there are higher requirements for anti-corrosion performance, hot-dip galvanized screws should be used, but the price will also increase accordingly.
Stainless steel screws are directly processed from steel containing alloying elements such as chromium and nickel. Common models include austenitic stainless steels such as 304 and 316. Its unique advantage is that there is no need for additional coating. When stainless steel is exposed to an oxygen-containing environment, the internal chromium element will actively react chemically with oxygen, automatically generating a thin and dense chromium oxide layer (i.e., passivation film) .
Some processes will also use methods such as soaking in acidic or alkaline solutions to make the oxide film more uniform and stable, further enhancing corrosion resistance. This passivation film can effectively block external water, air, and other corrosive media and prevent corrosion from occurring at the root. More importantly, even if the surface bumps cause the film layer to be damaged, the passivation film can repair itself and continuously protect the internal structure. In addition, some high-end models use polishing processes to improve the surface finish.
Core Performance Comparison
| Index | Galvanized screw | Stainless steel screw |
| Anti-corrosion properties | Medium, greatly affected by the environment; It is not easy to corrode when used indoors and in general environments, but it is easy to spot corrosion in humid or high temperature environments. | Excellent, it can still maintain stable performance under harsh conditions such as humidity, acid and alkali (such as weakly acidic rain, industrial wastewater), high salt spray (such as coastal environment), etc., and is not easy to rust after long-term use. |
| Tensile strength | The tensile strength of carbon steel is high; for example, the tensile strength of 8.8 grade galvanized screws is ≥ 800 MPa. | Medium strength, the tensile strength of 304 and 316 is about 500-600MPa, and a special type of 630 stainless steel can reach 1100-1300MPa. |
| Environmental adaptability | At 200 ℃, the zinc layer is easy to oxidize and fail, and the high-temperature resistance of the base material is better than that of stainless steel | It can maintain good toughness and mechanical properties at-196 °C and 600-800 °C. |
| Aesthetics | After the galvanized layer is worn, the true color of the metal is revealed, and the aesthetics decrease rapidly. | Silver white luster, long-term use still keeps smooth and clean. |
| Maintenance cycle | It is necessary to regularly check whether the galvanized coating of the screws is damaged, and find and repair it in time. | No maintenance required. |
| Cost of use | The initial investment is low, and the unit price is usually 1/3-1/5 of that of stainless steel screws. Suitable for high-volume purchasing projects with limited budgets | Although the unit price is high, the service life is long, the comprehensive use cost is low, and it is used in high-end fields with sufficient budget. |
Application Scenarios
Galvanized Screws
Construction industry:
Small galvanized screws are exquisite and practical, and are used in the installation of curtain walls, the safe fixation of sockets, and the reliable assembly of various lamps. Large galvanized screws are widely used in steel structure construction due to their strong bearing capacity, providing solid support for building structures.
Furniture industry:
It is used for the fine assembly of various wooden furniture such as tables and chairs, sofas, beds, coffee tables, etc., to ensure that all parts fit closely, so that the overall structure of the furniture is stable, and the color galvanizing is beautiful and durable.
Automobile manufacturing:
In automobile production, galvanized bolts are an indispensable key component. They are widely used in the precision assembly of core accessories such as automobile chassis and engine transmission shafts, providing a solid guarantee for the safe operation of vehicles.
Mechanical equipment:
In agricultural machinery, such as precision assembly of tractor chassis frames and various accessories of harvesters, galvanized screws are widely used to achieve reliable connection between various components; In industrial machinery assembly scenarios, galvanized screws are often used as core fastening components for operations such as the construction of machine tool protective devices and the precise positioning and fixing of assembly line guide rail systems to ensure the stable operation and efficient production of the equipment.
Stainless Steel Screws
Medical equipment: In the production of large and small medical equipment, manufacturers use stainless steel screws for the assembly of various parts.
Food machinery: Manufacturers take advantage of the excellent anti-rust and easy-to-clean characteristics of stainless steel screws, and widely use them in the manufacture of food processing equipment, thus effectively ensuring the hygiene standards and product quality of food production.
Offshore engineering: Engineers use stainless steel screws to cope with harsh marine environments, such as shipbuilding, offshore platform construction, and other offshore engineering projects.
Chemical equipment: Technicians use stainless steel screws to connect chemical pipelines, reactors, and other equipment, so that they can resist corrosion by various chemicals.
Electronic equipment: Designers use the good conductivity of stainless steel screws to ensure the performance stability and reliability of electronic equipment in the connection of circuit boards.
Architectural decoration: The construction team used stainless steel screws to complete the stable installation of indoor and outdoor guardrails, the construction of photovoltaic brackets, and the assembly of kitchen facilities and high-end furniture.
Resumen
The above is a detailed comparison between stainless steel screws and galvanized screws. When selecting, it is recommended that you comprehensively consider budget status, specific application scenarios, strength requirements, temperature conditions, indoor and outdoor environments, and other factors to accurately select screw products that meet your needs.
If you still have other doubts, please feel free to Contáctenos online. We can not only stably supply all kinds of high-quality fasteners such as screws, pernos, y nueces, but also are equipped with a professional technical team to provide you with technical support.
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