Q345B What color is the surface of manganese steel?

The surface is as white as stainless steel.

Q345 is a steel material. It is a low carbon alloy steel (C< with good comprehensive properties, good low temperature properties, cold stamping properties, welding properties and machinability. It 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.

It is composed of Q + number + quality grade symbol + deoxidation method symbol. Its steel number is prefixed with "Q", which represents the yield point of the steel, and the following number indicates the yield point value, and the unit is MPa, for example, Q235 represents the yield point (rel) of carbon structural steel I with a yield point (REL) of 235 MPa. When the brick carving party requires the steel plate to have the performance of the thickness direction, the symbol representing the performance level of the thickness direction (Z direction) is added after the grade, for example:

q345bz15。

If necessary, the steel number can be followed by a symbol indicating the quality grade and the method of deoxidation. The quality grade symbols are A, B, C, D, and E. Deoxidation Method Symbol:

f denotes boiling steel; b for semi-sedative steel: z for sedative steel; tz stands for special sedative steel, and sedative steel can not be marked with symbols, that is, z and tz can not be marked. For example, Q235-AF represents Grade A boiling steel.

Carbon steel for special purposes, such as bridge steel and marine steel, basically adopts the representation method of carbon structural steel, but the letter indicating the purpose is attached to the steel number.

The surface is as white as stainless steel.

I don't know what I bought it for.

Manganese steel Q345B vs Q355 which has high strength Hello dear, <>

Q355 has high strength, 345B and 355B are not the same material, 345B is alloy steel, and 355B is carbon steel. Q345B is a low-alloy high-strength manganese steel, with a yield strength of 345MPa, high strength, but slightly lower than 355B, carbon content, manganese content, and V, Ti, NB alloys are increased compared with general manganese alloy steel when smelting, and the comprehensive mechanical properties are good. Q355B is a medium carbon structural steel, the hardness and strength are increased, greater than Q345B, and the comprehensive mechanical properties are less than Q345B1, Q345:

It belongs to a kind of low-alloy steel. 2. Q355: It belongs to a low-alloy high-strength structural steel.

1. Q345: widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment, etc. 2、q355：

It is widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment, etc., where "q" means yield strength and trembling. 1. Q345: 345 means that the yield strength of this old steel is:

355 indicates that the yield strength of this steel is 355MPa, and its yield value decreases as the thickness of the material increases. Hope it helps!

16 manganese is now Q345B, one is which Xun cavity old grade, Q345B implements GB T1591-2008 and now the standard is also updated to GB T1591-2018, that is, Q355B

1. Introduction to Q345 low-alloy steel plate:

Q345 is a steel plate material. It is a low-alloy steel (C< Q represents the yield of this material, and the 345 behind it refers to the yield value of this material, which is about 345. The yield value of the shirt decreases as the thickness of the material increases.

Second, Q345 steel grade:

q345a，q345b，q345c，q345d，q345e。This is the distinction of grades, which is represented, mainly by the difference in the temperature of the impact.

3. Q345 steel plate impact temperature:

Q345A, no impact; Q345B, is 20 degrees normal temperature impact; Q345C, is 0 degree impact; q345d

level, which is a 20-degree impact; Q345E grade, is a 40-degree shock. At different impact temperatures, impact work is also available.

is different. Fourth, Q345 requires Z-direction performance + Z15 Z25 Z35:

When the demander requires 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: Q345BZ15, Q345BZ25, Q345BZ35.

5. Q345 steel plate chemical composition:

c:≤，si≤，mn:≤，p≤，s:≤，nb≤，v:≤，ti≤，cr≤，ni:≤，cu:≤，n:≤，mo:≤

6. Q345B Executive Standard: Executive GB Executive Standard: GB T1591-2018

7. Q345B heat treatment specification and metallographic structure:

8. Q345B delivery status: delivery in hot rolling, controlled rolling, normalizing and normalizing plus tempering state.

9. Q345B chemical composition:

C: ,Si ,Mn: ,P ,S: ,Nb ,V: ,Ti ,Cr ,Ni: ,Cu: ,Changshou N: ,Mo:

10. Q345B mechanical properties:

Yield Strength: 16mm: 345, 16-40mm:

335，40-63mm:≥325，63-80mm:≥315，80-100m:

305，100-150mm:≥285，150-200mm:≥275。

11. Q345B yield and tensile properties, elongation:

Tensile strength: 450-630, elongation: greater than 17, impact test: test temperature: 20: greater than 34.

12. Q345B main purpose:

It is widely used in machinery, heavy industry, steel structure industry, bridges, vehicles, ships, construction, containers, etc.

16. The difference between manganese and Q345b. Shanghai Bohu Group.

The carbon content is different.

Q345B: carbon content is less than.

16mn steel: carbon content.

The alloying elements are different.

Q345B: The alloying elements are copper, nickel, chromium, titanium, aluminum and niobium.

16mn steel: alloying elements are manganese, silicon, vanadium, niobium and titanium.

Yield strength. Q345B: Yield strength is 275-345MPa.

16Mn steel: Yield strength is 343MPa.

Different uses. Q345B: Q345B is commonly used as a component of bridges and girders, vehicles, ships, and buildings.

16MN Steel: 16MN steel is typically used as a weldment with a small thickness and a narrow groove.

16MN is the grade of low-alloy high-strength structural steel in the old national standard GB T1591 1988, the new national standard.

The grade in GB T1591 2008 is Q345 (Q345 has 5 quality grades, Q345A Q345E), and Q345A corresponds to the American ASTM grade GR·50.

The carbon content of 16mn steel is manganese, silicon, vanadium, niobium and titanium, etc., which are added to the main alloying elements. Its total alloy content <3%. According to the intensity, it is divided into 4 levels, such as 450MPa.

Mainly Q295, Q345, Q390, Q420, Q460. "q" is the Chinese pinyin of the word "yield".

The capital prefix, followed by the number is the minimum yield point (s) value of the grade, and the symbol after it is divided into A, B, C, D and so on according to the content of the steel impurity elements (sulfur and phosphorus) from high to low and accompanied by the change of carbon and manganese elements.

Among them, grade A and B steel is usually called 16Mn 16Mn is a material in steel. A term used to be used for steel. 16mn steel belongs to carbon-manganese steel.

The carbon content is around the limit, and the yield point is equal to 343MPa (the strength level is 343MPa). The alloy content of 16mn steel is less, the weldability is good, and there is generally no need to preheat before welding. But due to the hardening tendency of 16mn steel than low carbon steel.

It is slightly larger, so it is necessary to take preheating measures to prevent cold cracks when welding at low temperatures (such as winter open-air operations) or on large rigidity and thick structures.

First, the main ingredients are different.

Manganese: The carbon content is manganese (Mn), silicon (Si), vanadium (V), niobium (NB) and titanium (Ti), etc., which are added to the main alloying elements.

2. Q345B: low-carbon alloy steel (C< alloying elements such as Chawang vanadium V, titanium Ti, aluminum Al, boron B, rare earth RE in the steel, are microalloy limb elements, although the content is very low, it should still be marked in the steel number. For example, 20MnVB steel.

Vanadium is, boron is.

Second, the grade is different.

Manganese: 16MN is the old national standard grade, and now it is classified as low-alloy high-strength structural steel, and the current grade is called Q345.

2. Q345B: Q345 steel is a replacement for the old grades of 12MNv, 14MNNB, 18NB, 16MNre, 16MN and other steel grades, rather than only replacing 16MN steel.

Q345 is a steel material. 16MN is the national standard grade of the old Gaona, and now it is classified as low-alloy high-strength structural steel, and the current grade is called Q345.

Q345 steel plate.

The new standard is GB T3274-2007, but Q345 steel is a replacement for the old grades of 12MNv, 14MNNB, 18NB, 16MNre, 16MN and other steel grades, rather than only replacing 16MN steel.

In terms of chemical composition, 16MN is also different from Q345. More importantly, there is a large difference in the size of the thickness grouping of the two steels according to the different yield strengths, which will inevitably cause changes in the allowable stress of certain thicknesses of the material. Therefore, it is not appropriate to simply apply the allowable stress of 16MN steel to Q345 steel, but to re-determine the allowable stress according to the new steel thickness grouping size.

The proportion of the main components of Q345 steel is basically the same as that of 16Mn steel, except that V, Ti and Nb trace alloying elements are added. A small amount of V, Ti and Nb alloying elements can refine the grains, improve the toughness of the steel, and greatly improve the comprehensive mechanical properties of the steel. Because of this, the thickness of the steel plate can be made larger.

Therefore, the comprehensive mechanical properties of Q345 steel should be better than that of 16Mn steel, especially its low-temperature performance is not available in 16Mn steel. The allowable stress of Q345 steel is slightly higher than that of 16MN steel.

Q235 steel plate.

The lower yield strength limit of Q235 is 235MPa, and the lower yield strength limit of Q345 is 345MPa; Q235 is ordinary carbon steel, Q345 is low alloy steel; Q235 is used as metal structural parts, carburizing or cyanide parts with low core strength requirements, tie rods, connecting rods, hooks, couplers, bolts and nuts, sleeves, shafts and welded parts, Q345 has good comprehensive mechanical properties, low temperature performance, good plasticity and weldability, and is used as medium and low pressure containers, oil tanks, vehicles, cranes, mining machinery, power stations, bridges and other dynamic load structures, mechanical parts, building structures, general metal structural parts, hot rolled or normalized state use, can be used for -40 Various structures above the cold regions.

Hello dear, Q345B low-alloy high-strength steel rental, manganese content is not, manganese content is hope to help you. If my answer is helpful to you, please give a thumbs up (comment in the lower left corner), look forward to your like, your efforts are very important to me, and your support is also the motivation for me to take a lead step with a good gear. Finally, I wish you good health and a good mood!

Q345B Steel Plate Chemical Composition.

c：≤，si≤，mn：≤，p≤，s：≤，nb≤，v：≤，ti≤，cr≤，ni：≤，cu：≤，n：≤，mo：≤

Mechanics and performance.

Yield Strength: 16mm: 345, 16-40mm:

335，40-63mm：≥325，63—80mm：≥315，80—100mm：

305，100—150mm：≥285，150—200mm：≥275。

Tensile strength: 450-630.

Elongation: greater than 17.

Impact test: test temperature: 20: greater than 34.

16 manganese is actually Q345B, 16 manganese is the name of the old national standard, and the new national standard is now called Q345B

The material of the steel plate 16 manganese and Q345B are the common names of manganese plates, and the latest grade is Q355B, and the thickness is generally between 8mm-400mm.