Pre-galvanized steel is a type of carbon steel that has undergone a galvanization process before fabrication. This process involves coating the steel with a layer of zinc to protect it from corrosion and rust. Pre-galvanized steel is widely used in various industries due to its excellent corrosion resistance, cost-effectiveness, and versatility. It is commonly employed in construction, agriculture, transportation, and infrastructure projects. Stainless steel is a family of iron-based alloys containing a minimum of 10.5% chromium, which provides excellent corrosion resistance and durability. Depending on the alloying elements, stainless steels are categorized into five main types: Austenitic, Ferritic, Martensitic, Duplex, and Precipitation-Hardening (PH).
Pre-galvanized Steel of Specifications and Sizes
Dimensions
Pre-galvanized and steel pipes are available in a range of sizes. For instance, the outer diameter can vary from 1/2” to 4” (21.3 – 114.3mm), and the wall thickness typically ranges from 0.6 to 2.5mm. In terms of section shapes, pre-galvanized steel can be round, square, rectangular, or oval. The length of the pipes can be customized according to client requirements, usually ranging from 3 to 12 meters.
Standards
Pre-galvanized and steel pipes comply with various international standards such as BS 1387, BS1139, EN39, EN10219, ASTM A53, ASTM A795, API 5L, and GB/T3091. These standards ensure that the pipes meet specific requirements for dimensions, tolerances, and quality.
The corrosion resistance and mechanical properties of it depend on its chemical composition. Stainless Steel has the good products and the service is customerized for the clients. Stainless Steel has many shapes of products in China.
Chemical Composition of Pre-galvanized Steel
The chemical composition of pre-galvanized steel varies depending on the grade of the base carbon steel. Common grades include Q195, Q235, and Q345. For example, Q195 steel typically contains 0.06 – 0.12% carbon, 0.25 – 0.50% manganese, less than 0.05% sulfur, less than 0.045% phosphorus, and less than 0.3% silicon. Q235 steel has a carbon content of 0.12 – 0.2%, manganese content of 0.30 – 0.70%, and similar limits for sulfur, phosphorus, and silicon.
Key Observations:
Chromium (Cr): Essential for corrosion resistance (forms a passive oxide layer).
Nickel (Ni): Stabilizes austenitic structure (improves ductility & toughness).
Molybdenum (Mo): Enhances resistance to pitting/crevice corrosion (e.g., 316 vs. 304).
Carbon (C): Affects hardness and weldability (lower C = better corrosion resistance).
Physical Properties of Pre-galvanized Steel
The zinc coating on pre-galvanized a steel provides excellent corrosion resistance. The zinc layer acts as a barrier, preventing the underlying steel from coming into contact with moisture and oxygen, which are the main causes of rust and corrosion. The thickness of the zinc coating can vary, with pre-galvanized steel typically having a zinc coating of 30 – 150g/m², while hot-dip galvanized steel can have a coating of 200 – 520g/m².
Mechanical Properties of Pre-galvanized Steel
The mechanical properties of pre-galvanized a steels depend on the base carbon steel grade. For Q195 steel, the yield point is greater than 195 MPa, the tensile strength ranges from 315 to 430 MPa, and the elongation is 32 – 33%. Q235 steel has a yield point of over 235 MPa, a tensile strength of 375 – 500 MPa, and an elongation of 24 – 26%. Q345 steel has a yield point greater than 345 MPa, a tensile strength of 470 – 630 MPa, and an elongation of 21 – 22%.
Manufacturer Price of Pre-galvanized Steel
- Manufacturing and Cost of Pre-Galvanized Steel
The manufacturing process of pre-galvanized a steel involves coating the carbon steel with zinc before fabrication. The cost of pre-galvanized steel is influenced by several factors, including the price of raw materials (steel and zinc), manufacturing processes, and market demand. In general, the cost of pre-galvanized steel is lower than that of stainless steel due to the lower cost of raw materials and simpler manufacturing processes.
- Pricing Insights
The price of pre-galvanized a steel can vary depending on the market conditions, supplier, and order quantity. For example, Tianjin Youfa International Trade Co., Ltd. offers pre-galvanized steel pipes at prices ranging from US610 per ton for quantities of 200+ tons. Tianjin Jinnuo Steel Pipe Co., Ltd. provides pre-galvanized steel pipes at US$550 – 600 per ton with a minimum order quantity of 5 tons.
Comparison with Carbon Steel & Aluminum
| Property | Stainless Steel (304) | Carbon Steel (A36) | Aluminum (6061) |
|---|---|---|---|
| Corrosion Resistance | Excellent | Poor (rusts) | Good (oxidizes) |
| Strength (MPa) | 515-720 | 400-550 | 125-310 |
| Weight (g/cm³) | 8.0 | 7.85 | 2.7 |
| Cost | High | Low | Medium |
Advantages and Benifits
Corrosion Resistance: It provides long-lasting protection against corrosion, making it suitable for use in harsh environments such as coastal areas or areas with high humidity. This extends the lifespan of the steel products and reduces maintenance costs.
Cost-Effectiveness: It is more cost-effective compared to other corrosion-resistant materials such as stainless steel. The initial cost of pre-galvanized steel is lower, and its long-term durability reduces the need for frequent replacements and repairs.
Versatility: It can be used in a wide range of applications, including water supply systems, gas pipelines, structural supports, fencing, and agricultural equipment. Its versatility makes it a popular choice in various industries.
Application of Pre-galvanized Steel
- Construction Industry
Pre-galvanized a steel is widely used in the construction industry for structural supports, fencing, and roofing. Its corrosion resistance and durability make it ideal for use in outdoor environments.
- Agriculture Industry
In the agriculture industry, pre-galvanized a steel is used for fencing, livestock enclosures, and irrigation systems. Its low cost and long lifespan make it a popular choice for farmers.
- Transportation Industry
Pre-galvanized a stainless steel pipes are used in the transportation industry for gas pipelines, water supply systems, and structural supports for bridges and tunnels.
- Infrastructure Projects
Pre-galvanized a stainless steel is also used in infrastructure projects such as power transmission towers, communication towers, and lighting poles. Its strength and corrosion resistance make it suitable for use in these critical applications.
| Feature | Pre-Galvanized Steel | Stainless Steel |
|---|---|---|
| Base Material | Carbon Steel | Alloy Steel (contains chromium) |
| Cost | Lower | Higher |
| Corrosion Resistance | Good (zinc coating) | Excellent (chromium content) |
| Applications | Construction, Agriculture, Transportation, Infrastructure | Food and Beverage, Medical Equipment, Architectural Applications |
| Manufacturing Process | Galvanization before fabrication | Complex alloying and forming processes |
In Conclusion
Pre-galvanized a steel is a versatile and cost-effective material that offers excellent corrosion resistance and durability. Its wide range of applications in various industries makes it a popular choice for many projects. When procuring pre-galvanized steel, it is important to consider factors such as quality assurance, quantity discounts, and cost-effectiveness. By understanding the specifications, chemical composition, physical and mechanical properties, and benefits of pre-galvanized steel, buyers can make informed decisions and select the right product for their needs.
Pre-galvanized a steel is a cost-effective, corrosion-resistant steel product that undergoes galvanization before fabrication, unlike traditional post-fabrication galvanizing. This method provides a uniform zinc coating, making it ideal for applications requiring moderate corrosion protection without the high cost of stainless steel.