SS33–SS80 Steel Grades
Versatile Galvanized Structural Steel for Construction and Manufacturing
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SS33–SS80 Steel Technical Specifications & Applications
SS33–SS80 are hot-dip galvanized structural steel grades under ASTM A653, designed for general construction and manufacturing applications. These grades are defined by their yield strength, ranging from SS33 (33 ksi) to SS80 (80 ksi), providing a reliable balance of strength and formability. They offer moderate tensile strength, good elongation, and suitable bendability for structural components, beams, columns, supports, and light manufacturing parts. SS33–SS80 steels are widely used in construction, automotive, and industrial applications where versatile performance is required.
Table of Contents
1. Typical Uses & Selection Guidance
- SS33–SS80 Overview
SS33–SS80 are hot-dip galvanized structural steel grades under ASTM A653, designed for general construction and manufacturing applications. These grades are defined by yield strength, ranging from SS33 (33 ksi) to SS80 (80 ksi), offering a reliable balance of strength and formability for structural and light manufacturing use. - Corrosion Protection
SS33–SS80 steels can be coated with an aluminum-zinc (AZ) alloy, typically containing about 55% aluminum, 43.5% zinc, and 1.5% silicon. This coating protects against rust and oxidation in industrial or outdoor environments, maintains a smooth surface, and enhances heat resistance for high-temperature applications. - Forming Advantages
SS33–SS80 provide moderate tensile strength, good elongation, and suitable bendability, allowing efficient bending, cutting, and shaping for beams, columns, supports, and automotive components. Strict production standards ensure consistent mechanical properties and reliable performance in construction and manufacturing applications.
2. Technical Specifications Table
1. Chemical Composition Requirements (Maximum %)
| Steel Grade | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Titanium (Ti) |
|---|---|---|---|---|---|---|
| SS33–SS80 | ≤ 0.15% | ≤ 0.50% | ≤ 1.20% | ≤ 0.05% | ≤ 0.045% | Not specified |
2. Mechanical Property Requirements (Maximum Values)
| Steel Grade | Min. Yield Strength (MPa) | Min. Tensile Strength (MPa) | Min. Elongation (%) | Bend Angle (°) | Mandrel Diameter (× Thickness t) |
|---|---|---|---|---|---|
| SS33 | 230 | 310 | ≥20% | 180° | 4t |
| SS80 | 550 | 550 | ≥2% | 180° | 4t |
3. Mechanical Property Requirements (Maximum Values)
| Coating Class | Mandrel Diameter (× Thickness t) |
|---|---|
| Z100, Z200 | 1t |
| Z275, Z350, Z450, AZ150, AZ200, AM100, AM125, AM150, AM175, AM200, AM225 | 2t |
| Z600 | 3t |
4. Applicable Hot-Dip Metallic Coating Types
| Coating Class | Composition (%) | Key Features |
|---|---|---|
| Z (Zinc) | ≥99% Zinc | Basic corrosion protection; suitable for general use. |
| ZA (Zinc-Aluminium) | 95% Zn, 5% Al | Improved corrosion resistance over pure zinc. |
| ZF (Zinc-Iron) | Zinc with iron alloy | Enhanced hardness and wear resistance. |
| ZM (Zinc-Magnesium) | Zn with 2–4% Mg, 5–13% Al | Superior corrosion resistance in harsh environments. |
| AZ (Aluminium-Zinc) | 55% Al, 43.5% Zn, 1.5% Si | Excellent corrosion resistance and heat reflectivity. |
| AM (Aluminium-Magnesium) | Al with Mg alloy | High corrosion resistance; suitable for high-temperature applications. |
3. SS33–SS80 vs HSLA — What’s the Difference?
| Property | SS33–SS80 Steel Grade | HSLA Steel Grade |
|---|---|---|
| Yield Strength | ≥205 MPa | ≥275 MPa |
| Tensile Strength | 340–520 MPa | 450–550 MPa |
| Elongation (80 mm) | ≥20% | 20–22% |
| Bendability | 180° with 1t mandrel | 180° with 2t mandrel |
SS33–SS80 Steel FAQ：
SS33–SS80 are hot-dip galvanized structural steel grades under ASTM A653, designed for general construction and manufacturing applications. These grades are defined by yield strength, ranging from SS33 (33 ksi) to SS80 (80 ksi), offering a reliable balance of strength and formability for structural and light manufacturing use.
SS33–SS80 steels provide moderate tensile strength, good elongation, and suitable bendability, allowing efficient bending, cutting, and shaping for beams, columns, supports, and automotive components. Strict production standards ensure consistent mechanical properties and reliable performance in construction and manufacturing applications.
SS33–SS80 steels can be coated with an aluminum-zinc (AZ) alloy, typically containing about 55% aluminum, 43.5% zinc, and 1.5% silicon. This coating protects against rust and oxidation in industrial or outdoor environments, maintains a smooth surface, and enhances heat resistance for high-temperature applications.
SS33–SS80 grades are commonly used in construction, manufacturing, and automotive industries for structural components such as beams, columns, supports, and light manufacturing parts. They provide a balance between strength and formability, making them versatile for various applications.
Compared to other steel grades, SS33–SS80 offer a balance between strength and formability, making them suitable for applications requiring moderate strength and good formability. For applications requiring higher strength, other steel grades may be more suitable. Always consult with material specifications to ensure the appropriate grade is selected for your specific needs.
