Steel Grade: Q420B
Specification: GB/T 1591 – Low Alloy High-Strength Structural Steel
Product Type: Carbon Steel Plate / Structural Plate
Q420B is a high-strength low-alloy structural steel widely used in construction, machinery, bridges, and pressure vessels. Manufactured according to the GB/T 1591 standard, it offers excellent mechanical properties, weldability, and toughness.
For special applications, Q420B plates can be cut, welded, or processed into small parts, round plates, seal heads, and other structural frames in our processing plant.
Technical Requirements & Additional Services
Low-Temperature Impact Test for enhanced toughness in cold environments.
Custom Cutting and Welding according to end-user specifications.
Stricter Control on Key Chemical Elements for critical applications.
Original Mill Test Certificate issued under EN 10204 3.1/3.2 standards.
Ultrasonic Testing per GB/T 2970, JB4730, EN 10160, ASTM A435, A577, A578 to ensure defect-free material.
Mechanical Properties of Q420B Steel Plate
| Thickness (mm) | Yield Strength (MPa) | Tensile Strength (MPa) |
|---|---|---|
| ≤16 | 420 | 520–680 |
| >16–35 | 400 | 520–680 |
| >35–50 | 380 | 520–680 |
| >50 | 360 | 520–680 |
Chemical Composition (Max %, Heat Analysis)
| Element | C | Si | Mn | P | S | V | Nb | Ti | Cr | Ni |
|---|---|---|---|---|---|---|---|---|---|---|
| Max % | 0.20 | 0.55 | 1.00–1.70 | 0.040 | 0.040 | 0.02–0.20 | 0.015–0.060 | 0.02–0.20 | 0.40 | 0.70 |
Notes:
The low carbon content and microalloying with V, Nb, and Ti improve strength, toughness, and weldability.
Strict control of P and S ensures good low-temperature performance.
Applications
Structural Engineering: Bridges, buildings, and large-span structures.
Machinery Manufacturing: Crane booms, heavy equipment frames, and high-stress components.
Pressure Vessels & Energy Equipment: Medium/high-pressure boilers, wind towers, offshore structures.
Custom Components: Small parts, round plates, seal heads, and specialized frames.
This version highlights Q420B steel plate's technical reliability, customization capabilities, and industrial applications, making it suitable for b2b product catalogs, website pages, or technical brochures.
If you want, I can also convert this into a Q420B seamless steel pipe version with the same format, technical tables, and application highlights, so it's ready for a pipe product page.
