Q420 is what material is the material, Q460 is what material

Q420 is a low-alloy high-strength structural steel. Q420 is not only high-strength steel, it is also low-carbon steel.

It's just its tensile strength.

A little better, the yield strength of Q235.

It is 235N2 and the yield strength of Q420 is 420Nmm2, which cannot be tempered due to its low carbon content.

and so on, but it is still impossible to process shafts, gears, etc.

But it is very good to make a steel plate, and the strength is much higher than that of Q235. Q420 has high strength and good fatigue resistance; High toughness and low brittle transition temperature; Good cold forming and welding properties; It has good corrosion performance and certain wear resistance.

First of all, Q420 is a grade of low-alloy high-strength steel plate, which is mainly used for two kinds of steel plates in construction and engineering structures by adding a small amount of alloying elements to the steel. The grade name Q420 is a steel plate with a yield strength of 420MPa, and Q is the abbreviation of yield strength.

Q420 Chemical Composition: C SI MN P S NB V TI CR NI CU N MO

Mechanical properties of Q420: Yield strength 340, tensile strength 500-680, elongation after fracture 18, impact energy 34

Q420 has good mechanical properties and weldability, good cold and hot workability, due to the addition of Wei alloying elements, the strength and toughness of the steel are improved and improved.

Q420 is mainly used in the manufacture of mining machinery, heavy vehicles, ships, bridges, medium and high pressure boilers, containers and other large welding and structural parts.

Answer: 1. Q420B CD E material belongs to: low alloy high-strength steel plate, executive standard: GB1591-2008.

2. The material Q420R belongs to the steel plate for pressure vessels.

Material name: Q420R

Executive standard: GB713-2014

Q420R specification: 8-320

Q420R width: 1500-4200

Q420R length: 6000+

Q420R: Wugang.

q420r |Fourth, the name of the metal material Q420R: steel plate, medium plate, steel, plate.

Q420R steel plate thickness 6mm-350mm, rolled plate, plate, forging, forging plate, etc.

q420r |Fourth, the cutting meter-Q420R performance guarantee: steel plate width 1500mm-4020mm, hot rolling, control tie, normalizing, flaw detection, etc.;

Mild steel has a higher yield strength.

Q420 is a low-alloy high-strength structural steel. Executive standard: GB1591-2008, some steel mills have their own enterprise standards, basically refer to the national standard, similar to each other.

The grade of steel is composed of three parts: the Chinese pinyin letter representing the yield strength, the yield strength value, and the quality grade symbol, Q420C, where:

Q - the yield strength of the steel "yield" character "yield" in the first letter of Chinese pinyin;

420—yield strength value, unit mpa;

C—The quality level is C (grades are divided into A, B, C, D, E).

When the demander needs the steel plate to have the performance in the thickness direction, the symbol representing the performance level in the thickness direction (Z direction) is added after the grade specified above, for example: Q420CZ15.

Q420 has high strength and good fatigue resistance; High toughness and low brittle transition temperature; Good cold forming and welding properties; It has good corrosion resistance and certain wear resistance. High strength, especially in the normalized or normalized plus tempering state, it has high comprehensive mechanical properties.

Low-alloy high-strength steel. Q460 is a low-alloy high-strength steel. q represents the strength of the steel, 460 represents 460 megapascals, mega is 10 to the 6th power, and pal is the unit of pressure Pascal.

Q460 is the plastic deformation of steel when the force strength reaches 460 megapascals, that is, when the external force is discharged, the steel can only maintain the shape of the force and cannot return to its original shape, which is greater than the general steel. <

Low-alloy high-strength steel. Q460 is a low-alloy high-strength steel. q represents the strength of the steel, 460 represents 460 megapascals, mega is 10 to the 6th power, and pal is the unit of pressure Pascal.

Q460 is the plastic deformation of steel when the force strength reaches 460 megapascals, that is, when the external force is discharged, the steel can only maintain the shape of the force and cannot recover the original shape, which is greater than the general steel. On the basis of ensuring the low carbon equivalent, Q460 appropriately increases the content of microalloying elements. Good weldability requires a low carbon equivalent of the steel, and the increase of microalloying elements will increase the carbon equivalent of the steel while increasing the strength of the steel.

But fortunately, the increase in carbon equivalent is very small, so it does not affect the weldability of the steel.

Q345 is a type of steel:

Q345 is a type of steel:It belongs to a kind of low-alloy steel, which is widely used in bridges, ships, construction, special equipment, etc., where Q means yield strength, and 345 means that the yield strength of this steel is 345MPa.

For the testing of Q345 steel, there are mainly two aspects: one is whether the steel element content meets the national standard, and the other is whether the strength and tensile test of the steel meet the standard through professional institutions. It has a different alloy content from Q235, which is a common carbon steel and Q345 is a low-alloy steel.

Structural Performance:

Q345 will decrease with the increase of the thickness of the material, and the domestic may be less than 345MPa, so the strength must be less than 345MPa in mechanical design, otherwise there will be problems.

Note: Compared with the old standard, the latest Q345 standard GB T1591-2018 has the most obvious change is the change in the content of MN elements, which has been corrected from the original to , and the limit of the minimum value has been cancelled.

With the development of modern industry and the continuous progress of science and technology, various trace elements are more widely used in steel plates, and MN content is no longer the only factor affecting the strength and mechanical properties of steel.

Mechanical properties

Q345D seamless pipe mechanical properties:

Tensile strength: 490-675MPa Yield strength: 345MPa, elongation: 22%.

Q345B seamless pipe mechanical properties:

Tensile strength: 490-675MPa, yield strength: 345MPa, elongation: 21%.

Q345A seamless pipe mechanical properties:

Tensile strength: 490-675MPa, yield strength: 345MPa, elongation: 21%.

Q345C seamless pipe mechanical properties:

Tensile strength: 490-675MPa Yield strength: 345MPa, elongation: 22%.

Q345E seamless pipe mechanical properties:

Tensile strength: 490-675MPa Yield strength: 345MPa, elongation: 22%.

Q345 is a general term for a steel material, and Q345B is one of the quality grades. The specific differences are as follows:

Q345 is a steel material. It is a low-carbon alloy steel (C< with good comprehensive properties, good low temperature properties, cold stamping properties, good welding properties and machinability, and is widely used in bridges, vehicles, ships, buildings, pressure vessels, etc.

Q represents the yield of this material, and the 345 behind it refers to the yield value of this material, which is about 345MPa. and will decrease its yield value as the thickness of the material increases.

Dude, the grade you said is wrong, generally Q235-A is a carbon steel plate. It is the most commonly used carbon steel, and A stands for the grade that does not do any Charpy impact test at any temperature, which is the least stringent grade for this material. Q235 has four levels - a, -b, -c, -d

The Q345 brand is not classified as A-grade and B-grade.

Dude, the grade you said is wrong, generally Q235-A is a carbon steel plate. It is the most commonly used carbon steel, and A stands for the grade that does not do any Charpy impact test at any temperature, which is the least stringent grade for this material. Q235 has four levels - a, -b, -c, -d

The Q345 brand is not classified as A-grade and B-grade. In the plate, the steel of this component is called Q345R, and in the bar, the profile is Q345In the pipe, because there is also a significant Mn content, it is a two-phase mixed steel of pearlite and ferrite.

In steel, it is classified in low-alloy high-strength steel.

Q345A is a low-alloy high-strength steel plate, whole plate cutting process.

<> low-alloy high-strength structural steel. Q420 is a low-alloy high-strength structural steel. People in the industry know that the grade of steel is represented by the Chinese pinyin letter representing the yield strength, of which Q420 refers to the yield strength in 420MPa, its implementation standard is GB1591-2008, its chemical composition is mainly C, SI, MN, P, S, NB, V, TI, CR, NI, CU, N, MO has good mechanical properties and weldability, and the cold and hot processing performance is also very good, which generally improves and improves the strength and toughness of steel.