Hot-rolled Q355B (16Mn) low-alloy high-strength round bar for shafts, bolts, structural components and machinery parts.
Q355B carbon steel round bar is a hot-rolled low-alloy high-strength structural steel (former 16Mn) with 355 MPa minimum yield. It is widely used in engineering machinery, bridges, ships and construction where Q235 strength is not enough.
Key Advantages
Chemical Composition (Q355B)
| Element | C | Si | Mn | P | S |
|---|---|---|---|---|---|
| Content % | ≤ 0.24 | ≤ 0.55 | 1.00 – 1.60 | ≤ 0.035 | ≤ 0.035 |
Mechanical Properties
- Tensile strength (σb): 470 – 630 MPa
- Yield strength (σs): ≥ 355 MPa (≤ 16 mm thick)
- Elongation (δ): ≥ 21 %
- Impact (Charpy V): ≥ 34 J at +20 °C
Standard Sizes
| Parameter | Range |
|---|---|
| Diameter | 16 – 300 mm |
| Length | 3 – 6 m (cut to length) |
| Surface | Black / peeled / bright |
| Standard | GB/T 1591 / equivalent ASTM A572 Gr.50 |
Applications
Q355B round bar is used for shafts, bolts and nuts, gears, crane hooks, bridge components, truck frames, structural columns and heavy machinery parts. For general Q235B round bar see our Q235B round bar; for high-strength plate see Q355B plate.
Processing & Packaging
Cutting, turning, peeling and CNC machining available. Bars are strapped in bundles on wooden pallets.
Send diameter, length and quantity — we confirm price within 24 hours.
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