Q255 Steel
Q255 Steel
Q255 steel is a carbon structural steel in China. Its yield strength is 255MPa (experimental value measured with a 16mm steel bar), so it is called Q255 steel.
Quality grade of Q235 steel
Q235 steel quality grade symbols are A, B (Q255A, Q255B).
The main characteristics of Q255 steel
Q255 steel has better strength, plasticity and toughness, better welding performance and cold and hot pressure processing performance.
Q255 steel of deoxidation method: killed steel
Q255 steel Chemical composition
Q255 steel Mechanical properties
Q255 steel Minimum Elongation
Where "d" is the thickness or diameter of the steel.
Q255 Steel Minimum Charpy Impact
Q255 Steel Bending Test Results
B=Sample Steel Width a=Sample Diameter or Thickness
Q255 steel application
Q255 steel is used to manufacture parts that require less strength, such as bolts, keys, rockers, shafts, tie rods, and various types of steel and steel plates for steel structures.
Q255 steel is a carbon structural steel in China. Its yield strength is 255MPa (experimental value measured with a 16mm steel bar), so it is called Q255 steel.
Quality grade of Q235 steel
Q235 steel quality grade symbols are A, B (Q255A, Q255B).
The main characteristics of Q255 steel
Q255 steel has better strength, plasticity and toughness, better welding performance and cold and hot pressure processing performance.
Q255 steel of deoxidation method: killed steel
Q255 steel Chemical composition
| Standard | Steel Grade | Quality Grade | Chemical composition (%) | ||||
| C | Si | Mn | P | S | |||
| GB / 700 | Q255 | Q255A | 0.18-0.28 | ≤0.30 | 0.40-0.70 | ≤0.045 | ≤0.050 |
| Q255B | 0.18-0.28 | ≤0.30 | 0.40-0.70 | ≤0.045 | ≤0.045 | ||
Q255 steel Mechanical properties
| Standard | Steel Grade | Quality Grade | Yield Strength(MPa) | Tensile Strength(MPa) |
| GB / 700 | Q255 |
Q235A Q235B |
255 | 410~550 |
Q255 steel Minimum Elongation
| Standard | Steel Grade | Elongation(≥%), Thickness or Dia(d) mm | |||||
| d≤16 | 16＜d≤40 | 40＜d≤60 | 60＜d≤100 | 100＜d≤150 | 150＜d | ||
| GB / 700 | Q255 | 24 | 23 | 22 | 21 | 20 | 19 |
Where "d" is the thickness or diameter of the steel.
Q255 Steel Minimum Charpy Impact
| Standard | Steel Grade | Quality Grade | Charpy Impact(V notch) | |
| Temp ℃ | Impact energy(Longitudinal,≥J) | |||
| GB / 700 | Q235 | Q235A | ||
| Q235B | +20 | 27 | ||
Q255 Steel Bending Test Results
| Standard | Steel Grade | Cold Bending Test 180°（B=2a | ||
| Steel Dia.(d) of Curve Center | ||||
| d≤60mm | 60＜d≤100 | 100＜d≤200 | ||
| GB / 700 | Q235 | 2a | 3a | 3.5a |
B=Sample Steel Width a=Sample Diameter or Thickness
Q255 steel application
Q255 steel is used to manufacture parts that require less strength, such as bolts, keys, rockers, shafts, tie rods, and various types of steel and steel plates for steel structures.
