What is the dimensional tolerance standard for S355J0WP weathering steel?

The dimensional tolerances for S355J0WP weathering steel depend on its product form (plate, sheet, bar, structural sections) and are governed by European standards (EN). Below are the key tolerance standards for different forms of S355J0WP:

1. Steel Plates & Sheets (EN 10029)

Thickness Tolerance:

For thickness ≤ 80 mm, standard tolerances apply (e.g., ±0.3 mm for 10 mm plate).

For thickness > 80 mm, wider tolerances (±1–2% of nominal thickness).

Width/Length Tolerance:

Width: ±10 mm (standard), ±5 mm (higher precision).

Length: ±0–50 mm (depends on cut method).

2. Hot-Rolled Structural Sections (EN 10034)

I-beams, H-beams, channels, angles:

Height/Width: ±2–4 mm (for profiles up to 400 mm).

Flange Thickness: ±0.5–1.5 mm.

Straightness: Max 0.15% of length (e.g., 3 mm deviation per 2 m).

3. Round & Flat Bars (EN 10060, EN 10058/10059)

Diameter/Thickness Tolerance:

Round bars (EN 10060): ±0.5–1.5 mm (for 10–50 mm diameter).

Flat bars (EN 10058): ±0.3–0.8 mm (thickness), ±1–3 mm (width).

4. Tolerances for Weathering Steel vs. Standard Steel

Same as non-weathering grades (e.g., S355JR) since tolerances are based on product form, not material type.

Special tolerances (e.g., EN 10051 for strip/coil) may apply for cold-rolled products.

5. Surface & Edge Tolerances

Surface roughness (EN 10163):

Class A (smooth) to Class D (as-rolled).

Edge condition:

Mill edges (tolerate minor imperfections) vs. sheared/machined edges (tighter tolerances).

Key Standards for S355J0WP Tolerances