Q235 common carbon structural steel is also called A3 steel.
Common carbon structural steel - plain plate is a kind of steel material.
Q represents the yield limit of this material. The following 235 refers to the yield value of this material, which is about 235MPa. And will increase with the thickness of the material and make its yield value decreased, because of moderate carbon content, good comprehensive performance, strength, plasticity and welding performance is better match, the most widely used.
Q235 common carbon structural steel is also known as A3 plate.
Common carbon structural steel - plain plate is a kind of steel material.
Q represents the yield limit of this material. The following 235 refers to the yield value of this material, which is about 235MPa.
And the yield value decreases with the increase of the thickness of the material (thickness/diameter ≤16mm, yield strength is 235MPa; 16mm< plate thickness/diameter ≤40mm, yield strength is 225MPa; 40mm< plate thickness/diameter ≤60mm, yield strength is 215MPa; 60mm< plate thickness/diameter ≤100mm, yield strength is 205MPa; 100mm< plate thickness/diameter ≤150mm, yield strength is 195MPa; 150mm< plate thickness/diameter ≤200mm, yield strength is 185MPa).
Because the carbon content is low, the comprehensive performance is better, the strength, plasticity and welding performance is better match, the most widely used.
By Q+ number + quality grade symbol + deoxidation method symbol. The steel number is labeled "Q", which represents the yield point of the steel, followed by a number indicating the yield point in MPa. For example, Q235 represents a carbon structural steel with a yield stress (σ S) of 235 MPa.
If necessary, the steel number may be followed by a symbol indicating the quality grade and deoxidation method.
Q235 Steel (Q235A Q235B Q235C Q235D)
Q235 is ordinary carbon structural steel. Q represents the yield limit of this material. The latter 235 refers to the yield value of this material, which is about 235MPa.
Consists of Q+number+quality grade symbol+deoxygenation method symbol. Its steel number is prefixed with "Q", which represents the yield point of the steel. The following number represents the value of the yield point, and the unit is MPa. For example, Q235 represents a carbon structural steel with a yield stress (σs) of 235 MPa.
Q235 quality grades are divided into A, B, C, D, E, followed by A grade with the poorer quality and D grade with the highest quality. Q235A, Q235B, Q235C, and Q235D represent different grades, mainly because the temperature of impact is different.
Features and Applications
1. It is widely used in construction and engineering structures. It is used to make steel bars or to build factory buildings, high-voltage power transmission towers, bridges, vehicles, boilers, containers, ships, etc., and it is also used as a large number of mechanical parts with low performance requirements. C and D grade steel can also be used as some professional steel.
2. It can be used for various mold handles and other unimportant mold parts.
3. Q235 steel is used as the punch material. After quenching, it can be used directly without tempering. The hardness is 36~40HRC, which solves the phenomenon of the punch chipping during use.
Chemical composition of Q235
Q235 Grade 4: A, B, C, D (GB/T 700-2006)
Q235A grade C ≤0.22% Mn≤1.4% Si ≤0.35% S ≤0.050% P ≤0.045%
Q235B grade C≤0.20% Mn≤1.4% Si ≤0.35% S ≤0.045% P ≤0.045% (with the consent of the buyer, the carbon content shall not exceed 0.22%)
Q235C grade C ≤0.17% Mn≤1.4% Si ≤0.35% S ≤0.040% P ≤0.040%
Q235D grade C ≤0.17% Mn≤1.4% Si ≤0.35% S ≤0.035% P ≤0.035%
Application
It is widely used in construction and engineering structures.
Advantages
1.It belongs to steel with good plasticity and toughness.
2.The bending strength is not large, and it belongs to the flexible steel.
3.Belongs to easy welding steel.
Standard
1.Q235 die steel quenching specification.
2.The quenching temperature is 950℃, the salt bath furnace is heated, and the 10% NaCl brine is cooled and quenched.
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