Q355B Overview
Q355B steel is a low alloy, high-strength steel that is used in welded structures supporting stress and heavy loads. The Q references the yield point, while the number 355 indicates its yield strength. It also replaced Q345.
Q355B Equivalent Materials
Q355 can be replaced with equivalent materials, including A572 Grade 50 USA ASTM, Q355 China GB/T, and SPFC 590 Vietnam/Japanese JIS.
Characteristics of Q355B
Q355 steel is a structural steel with a yield strength of 345 MPa and tensile strength of 450 MPa. It has terrific processing performance and compressive strength, which can be used to manufacture high-pressure gas pressure vessels containing less than 500 liters. Q355 also has a protective layer of rust resistance.
In addition to performance, Q355 has particular elements that prevent atmospheric corrosion. Since it is mild steel, it has a lower carbon content. If more carbon were added to the alloy, it would be reclassified as a cast iron.
Q355 is a newer Chinese steel grade that was designed to replace Q345. Its material density is 7.85 g/cm3 and possesses three quality levels, including Q355B, Q355C, and Q355D. It has great mechanical and hot and cold process properties. In contrast, it has better and more improved mechanical properties when compared to A36 ASTM steel.
Uses of Q355B
Q355 steel has excellent mechanical properties, great weldability, and ample corrosion resistance. It can be utilized to manufacture and produce petroleum storage tanks, high-pressure vessels, boilers, ships, power stations, and many other high-load structural parts. Q355 is also widely used to make shipping containers, waste storage containers, weather containers, offshore containers, workshop containers, and toolboxes.
| Element | Q355B (typical control) |
|---|---|
| C (carbon) | Controlled at low–medium levels for strength and weldability |
| Mn (manganese) | Present as principal strength/deoxidation element |
| Si (silicon) | Small controlled amount as deoxidizer |
| P (phosphorus) | Limited impurity (kept low) |
| S (sulfur) | Limited impurity (kept low) |
| Cr (chromium) | Typically very low or trace |
| Ni (nickel) | Usually trace/absent |
| Mo, V, Nb, Ti (microalloying) | May be present in small amounts in some production routes |
| Cu (copper) | Usually trace; not a design feature |
| N (nitrogen), B (boron) | Trace; controlled |
GNEE Steel provides Q355B low-alloy steel plates, as well as customized processing services to satisfy your various project requirements.
For any inquiries about product specifications, prices, or further cooperation, please contact us at any time. We welcome your inquiries and look forward to building long-term partnerships with you!
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