FS Type A/B galvanized steel is hot-dipped galvanized forming steel. FS Type A/B galvanized steel is a galvanized steel substrate designed for bending, drawing, stamping, and other processes with lower strength and better formability. FS Type A has a lower carbon content than FS Type B and is easier to form. Like SS structural steel, galvanized steel is a popular structural material for construction, automobiles, home appliances, and general-purpose metals.
ASTM A653 FS Type A/B
Wanzhi Group is a high quality galvanized steel solution for construction and industrial production, FS Type A/B galvanized steel is a special steel for construction, besides that, we also have general commercial galvanized steel, general structural steel, deep-drawing galvanized steel and so on, welcome to contact us for more information.
Mechanical Properties
| Parameter | FS Type A | FS Type B |
| Yield Strength (MPa) | ≥230 | ≥340 |
| Tensile Strength (MPa) | 310-450 | 450-600 |
| Elongation A50 (%) | ≥18 (t≤1.5mm) | ≥15 (t≤2.0mm) |
| Minimum Bending Radius | 0.75t (parallel rolling direction) | 1.0t (perpendicular rolling direction) |
Coating Weight
- Common grades: G30 (0.3oz/ft²), G60 (0.6oz/ft²), G90 (0.9oz/ft²), selected according to environmental corrosivity.
Surface Finishes
- Smooth Finish: Reduces friction and enhances formability (especially for Type B deep-drawn steels).
- Chromate passivation: enhances coating adhesion and retards the development of white rust.
- Painting: improves corrosion resistance and decorative qualities.
FS Type A VS FS Type B
| Parameter | FS Type A | FS Type B |
| Minimum Thickness | 0.6mm | 1.2mm |
| Coating Mandatory Standard | Optional | Optional |
| Seismic Certification | ❌ | ✅ Compliant with IBC/AISI S110 standards |
| Applicable Span | ≤3m | ≤6m |
| Corrosion Environment Limit | C3 (Urban) | C5 (Marine + Industrial) |
FS Type A/B Galvanized Steel VS SS Structural Steel Galvanized
| Property | FS (Framing Steel) | SS (Structural Steel) |
| Standard Definition | ASTM A653 designed for cold-formed building structures | ASTM A653 general structural steel |
| Core Advantages | Excellent cold-formability + Lightweight | High weldability + Resistance to dynamic loads |
| Yield Strength | Type A: ≥230MPa, Type B: ≥340MPa | Grade 33: ≥230MPa, Grade 50: ≥345MPa |
| Coating Requirements | Optional | Optional |
| Elongation (A50) | Type B: ≥15% | Grade 50: ≥16% (t≤2mm) |
| Bending Radius | Parallel rolling direction: 0.75t-1.0t | Perpendicular rolling direction: 1.5t |
| Typical Applications | Light steel studs, roof purlins, seismic bracing | Factory frames, conveyor trusses, heavy-duty shelving |
| Connection Process | Self-drilling screws/Resistance welding (Arc welding prohibited) | Bolt connections/Arc welding/MAG welding |
| Typical Applications | Household appliance casings, automotive body parts, ventilation ducts | Building frames, bridges, power tower frames, shelf columns |
| Corrosion Resistance | Dependent on coating weight | Dependent on coating weight, requires higher coating |
Global Standards
| ASTM A653 | EN 10346 | GB/T 2518 |
| FS Type A | S280GD+Z | CR250GD+Z |
| FS Type B | S350GD+ZF | CR320LA+Z |
FS Type A/B Galvanized Steel Application Scenario
Wanzhi Group FS Type A/B Galvanized Steel plays an important role in more than 100 countries and regions around the world in the construction field, home appliance industry, general manufacturing, automotive industry, precision machining, deep-drawn products and other industries.
FS Type A Galvanized Steel
- Non-load-bearing lightweight steel keel, corrugated roofing sheet, ceiling support system
- Ventilation duct
- Refrigerator liner, washing machine casing, air-conditioner bracket
- Shelving, tool box, metal furniture, equipment decorative covers
FS Type B Galvanized Steel
- Roof purlins, floor level beams, exterior wall keels
- Inner door panels, hoods, chassis coverings
- Electronic equipment housings, medical equipment components
- Food cans, battery housings, reflective covers for lamps and lanterns
Frequently Asked Questions
Q: Can FS Type A/B replace stainless steel?
A: No. The corrosion resistance of galvanized steel is better than that of ordinary carbon steel, but much lower than that of stainless steel, and it is only suitable for moderately corrosive environments.
Q: When should I choose FS Type A?
- Non-load-bearing structures: interior partition wall keels, ceiling brackets
- Low-corrosion environments: dry inland areas (C1-C2)
- Cost-sensitive items: unit price 26% lower than Type B
Q: How to differentiate between Type A and Type B?
A: By material certificate (MTC) or tensile test (Type B has higher elongation) provided by the supplier.
Q: What should I do if the galvanized layer is peeling off?
A: Check if oil is removed before processing or change to Galvannealed coating + passivation.
ASTM A653/A653M FS Type A/B galvanized steel has excellent cold forming properties, and the coating process and coating thickness can be optimized by the corrosion level of the application environment to achieve the dual purpose of formability and corrosion resistance.Wanzhi Group can enhance the customization of the solution, with free quotes and samples.