G250 Steel Grades
High-Performance Structural Steel with 250 MPa Yield Strength for Roofing, Cladding, and Light Structural Applications
- Technical Support
G250 Steel Technical Specifications & Applications
G250 Steel is a structural steel grade with a minimum yield strength of 250 MPa, offering an excellent balance of strength, toughness, and formability. It is widely used in roofing, cladding, general manufacturing, roll-formed profiles, and load-bearing components.
With excellent weldability and cold-forming performance, G250 Steel is ideal for bending, cutting, stamping, and roll-forming applications. Manufactured under strict quality control, it meets international standards and ensures consistent performance in various structural and galvanized steel applications.
As a key product of Hengze Steel Group, G250 Steel is trusted worldwide for high-performance galvanized structural steel solutions in construction, engineering, and manufacturing.
Table of Contents
1. Typical Uses & Selection Guidance
- Structural Applications – G250 steel combines a lower yield strength (250 MPa) with excellent ductility, making it suitable for cold-formed structural sections such as purlins, channels, and framing components where greater formability is required.
- Corrosion Protection – When hot-dip galvanized or metallic-coated (Zinc, Zinc-Aluminium), G250 provides reliable corrosion resistance for roofing, wall cladding, gutters, and general building applications, particularly in mild to moderate environments.
- Forming Advantages – The lower yield strength of G250 allows easier bending, tighter radii, and reduced risk of cracking, making it ideal for complex profiles, detailed fabrication, and applications requiring superior formability.
2. Technical Specifications Table
1. Chemical Composition Requirements (Maximum %)
| Steel Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Aluminum (Al) |
|---|---|---|---|---|---|---|
| G250 | 0.12% | 0.50% | 0.04% | 0.035% | 0.04% | 0.10% |
2. Mechanical Property Requirements (Maximum Values)
| Steel Grade | Min. Yield Strength (MPa) | Min. Tensile Strength (MPa) | Min. Elongation (%) Lo=50mm | Min. Elongation (%) Lo=80mm | Bend Angle (°) | Mandrel Diameter (× Thickness t) |
|---|---|---|---|---|---|---|
| G250 | 250 | 320 | 25 | 22 | 180 | 0t |
3. Coating Adhesion (180° Bend Test) Requirements
| Coating Class | Mandrel Diameter (× Thickness t) |
|---|---|
| Z100, AZ150, AM100, AM125, AM150 | 0t |
| Z200, AZ200, AM175, AM200 | 0t |
| Z275, AM225 | 0t |
| Z450 | 1t |
| Z600 | 2t |
4. Applicable Hot-Dip Metallic Coating Types
| Coating Class | Composition | Description |
|---|---|---|
| Zinc (Z) | 100% Zinc | Offers basic corrosion protection; commonly used for general applications. |
| Zinc-Aluminium (ZA) | 95% Zinc, 5% Aluminium | Provides enhanced corrosion resistance compared to pure zinc. |
| Zinc-Iron Alloy (ZF) | Zinc with iron alloy | Suitable for applications requiring improved hardness and wear resistance. |
| Zinc-Magnesium Alloy (ZM) | Zinc with magnesium alloy | Offers superior corrosion resistance, especially in aggressive environments. |
| Aluminium-Zinc (AZ) | 55% Aluminium, 43.5% Zinc, 1.5% Silicon | Known for excellent corrosion resistance and heat reflectivity. |
| Aluminium-Magnesium Alloy (AM) | Aluminium with magnesium alloy | Provides high corrosion resistance and is suitable for high-temperature applications. |
3. G250 vs G300 — What’s the Difference?
- G250: Structural steel with a minimum yield strength of 250 MPa, offering excellent ductility and high formability. Ideal for applications that require easy bending, tight radii, and complex fabrication. Commonly used in roofing, wall cladding, gutters, roll-formed sections, and light structural components.
- G300: Structural steel with a minimum yield strength of 300 MPa, providing higher load-carrying capacity while still maintaining good formability. Suitable for cold-formed purlins, framing sections, and structural components where a balance between strength and ease of fabrication is needed.
G250 Steel FAQ：
G250 Steel has a minimum yield strength of 250 MPa, making it suitable for light structural components and medium-load applications.
G250 Steel is widely used in roofing, wall cladding, purlins, framing sections, and light structural components, as well as automotive and appliance parts where strength and formability are required.
Yes, G250 Steel has excellent weldability and is compatible with standard welding methods, including SMAW (manual arc), GMAW (MIG/MAG), and GTAW (TIG).
Yes, G250 Steel is suitable for hot-dip galvanizing or metallic coatings. Common coatings include:
Z (Zinc) – basic corrosion protection
ZA (Zinc-Aluminium) – enhanced corrosion resistance
ZF (Zinc-Iron alloy) – improved hardness and wear resistance
ZM (Zinc-Magnesium alloy) – superior corrosion resistance in harsh environments
