Q355 Overview
Q355 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.
Q355 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 Q355
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 Q355
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.
If you need steel that is created to stand up to the needs of construction and engineering components that provide excellent weldability and toughness, then Q355 may be a strong contender for your next project or job.
Q355 Physical Properties
Physical Properties | Metric | US/Imperial |
Density | 7.80 g/cc | 0.282 lb/in³ |
Q355 Mechanical Properties
Mechanical Properties | Metric | US/Imperial |
Hardness, Brinell | 135 | 135 |
Hardness, Rockwell B | 74 | 74 |
Tensile Strength, Ultimate | 450 MPa | – |
Tensile Strength, Yield | 345 MPa | – |
Elongation at Break | 18 % | 18 % |
21 % | 21 % | |
Bulk Modulus | 160 GPa | 23200 ksi |
Shear Modulus | 80.0 GPa | 11600 ksi |
Q355 Component Elements Properties
Component Elements Properties | Metric | US/Imperial |
Carbon, C | <= 0.23 % | <= 0.23 % |
Iron, Fe | 98 % | 98 % |
Manganese, Mn | 1.35 % | 1.35 % |
Phosphorus, P | <= 0.040 % | <= 0.040 % |
Silicon, Si | <= 0.40 % | <= 0.40 % |
Sulfur, S | <= 0.050 % | <= 0.050 % |
Silicon, Si | 0.15 – 0.40 % | 0.15 – 0.40 % |
Sulfur, S | 0.050 % | 0.050 % |
*Redstone Manufacturing does not guarantee the accuracy of the information contained within the above table. Some metrics have been rounded, converted, or estimated. Consult a qualified engineer to confirm the accuracy of the information contained on this webpage.