SS Grade 250/345 Galvanized Steel is the American Standard A653/A653M designation for structural steel, SS for Structural Steel, designed for load-bearing members. Grade 250 = minimum yield strength of 250 MPa (36 ksi) and Grade 345 = minimum yield strength of 345 MPa (50 ksi), and is a popular metal for light duty structures, industrial building steel, equipment frames, and bridge structures.
SS Grade 250 VS SS Grade 345
Wanzhi Group produces CS Type A/B/C, FS Type A/B, DDS, HSS Grade 50, SS Grade 250/345 galvanized steel complying with A653/A653M requirements, with coating thicknesses ranging from 20-350g/m2, e.g. galvanized g90, galvanized g60, galvanized g30, etc.
Mechanical Properties
| Property | SS Grade 250 | SS Grade 345 |
| Yield Strength (MPa) | ≥250, medium strength structural steel | ≥345, high strength structural steel |
| Tensile Strength (MPa) | 370-500 | 450-600 |
| Elongation (%) | ≥20 (gage length 50mm) | ≥18 (gage length 50mm) |
| Hardness (HV) | ≤120 | ≤140 |
| Bending Radius | 1.0t | 1.5t |
| Typical Applications | Light structures, non-load-bearing components | Heavy structures, load-bearing components |
Processing Performance
SS Grade 250: good cold forming performance and weldability, suitable for bending, stamping, arc welding, gas
SS Grade 345: processing performance is weaker than SS Grade 250, the processing needs to control the amount of deformation of the cold molding, welding needs to be preheated.
SS Grade 250/345 Galvanized Steel – Application
ASTM A653/A653M SS Grade 250/345 Galvanized Steel has the advantages of high strength and light weight, long-lasting corrosion resistance, and easy roll forming/punching, etc. In addition, the outer layer of galvanization enhances impact and abrasion resistance, which makes it more reliable when subjected to pressure or external force, so it is widely used in many fields such as construction, transportation, and industrial equipment.
SS Grade 250 Galvanized Steel
- Plant (not main beam/column)
- Fences, stair treads.
- Agricultural equipment frames, greenhouse skeletons.
- Wall beams, secondary purlins, walkway panels
- Warehouse shelving, photovoltaic racks, cable trays
- Sound barriers
SS Grade 345 Galvanized Steel
- Steel plant main beams, roof trusses, girders, support columns.
- Bridge structure, high-rise building core.
- Mining machinery, lifting equipment base.
- Conveyor trusses, wind turbine tower lining
- Bridge maintenance channel
International Grade Comparison
| American Standard | EN 10346 | GB/T 2518 | JIS G3321 |
| SS Grade 250 | S250GD+Z | CR280GD+Z | SGHC 250 |
| SS Grade 345 | S350GD+ZF | CR390LA+Z | SGHC 340 |
Wanzhi – SS Grade 250/345 Galvanized Steel Factory
Wanzhi Group is a steel factory supplier from China, we are ISO certified and our products meet the international standards such as JIS, EN, GB, ASTM, etc. We have 7 production lines of steel in our factory with an annual production capacity of 600,000 tons, which can complete the deep processing such as slitting, flattening, bending, stamping, pressing, shaping, punching, painting, etc., and the surface treatments such as phosphating, passivation, and oil coating. Leave your desired coating thickness and substrate grade for a free quote!
SS Grade 250/345 Galvanized Steel is widely used in areas requiring corrosion resistance and structural support due to its high strength, corrosion resistance and formability, if you are looking for premium galvanized steel, then welcome to contact Wanzhi Group, we not only have Structural Steel, but also Commercial Grade, Punching, Painting and other deep processing, phosphating, passivation, oiling and other surface treatments.