What is the difference between Mn13 and 16Mn?

Classification by chemical composition Carbon steel can be divided into low carbon steel, medium carbon steel and high carbon steel according to chemical composition (i.e., carbon content).

1) Mild steel, also known as mild steel, has a carbon content from mild steel to easy to accept various processing such as forging, welding and cutting, and is commonly used in the manufacture of chains, rivets, bolts, shafts, etc.

2) Medium carbon steel Carbon steel with a carbon amount. There are a variety of products such as calming steel, semi-calming steel, boiling steel, etc. In addition to carbon, it can also contain small amounts of manganese (.

According to the quality of products, it is divided into ordinary carbon structural steel and high-quality carbon structural steel. The hot working and cutting performance is good, and the welding performance is poor.

The strength and hardness are higher than those of mild steel, while the plasticity and toughness are lower than those of mild steel. It can be used directly without heat treatment, hot rolled and cold drawn materials, or after heat treatment. The quenched and tempered medium carbon steel has good comprehensive mechanical properties.

The highest hardness that can be achieved is about HRC55 (HB538) and B is 600 1100MPa. Therefore, among the various uses at medium strength levels, medium carbon steel is the most widely used, in addition to being a building material, it is also widely used in the manufacture of various mechanical parts.

The 16 in Mn16 should represent the content of Mn, and the 16 in 16Mn should represent the content of C.

MN16 is an alloy tool steel with a carbon content greater than or equal to 1%, so it is omitted. Contains MN with a content of 16%.

16MN is an alloy structural steel with a carbon content of 16 parts per 10,000 and a content of mn that is less than.

16MN is the old standard name for Q345, which is a type of steel. It is a low-alloy steel (C< widely used in bridges, front shelter 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 of Huimeng, which is empty around 345.

and will decrease its yield value as the thickness of the material increases.

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, but Q345 steel is the replacement of the old grade 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 constituent elements 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.

The carbon content is less than or equal to, and this type of steel guarantees its mechanical strength at the factory, without requiring the alloy composition, that is, it is directly selected according to the mechanical strength required by the design, without heat treatment. The implication of Q345 is that the yield strength of the material can reach 345MPa

16mn is an alloy structural steel with a carbon contentIt also includes elements such as silicon, vanadium, niobium and titanium, which are harmful elements in steel due to the high content of sulfur and phosphorus in 16Mn.

It is easy to make the steel pipe green in the low temperature environment, which affects the working performance, and it has good comprehensive performance, good low temperature performance, good cold stamping performance, welding performance and machinability, so it is now widely used in mining, transportation, chemical and other machinery.

Advantages of 16mn steel plate

MN steel plate is a steel plate made of 16MN low-alloy structural steel, so we say that its comprehensive mechanical properties, welding performance and low-temperature impact toughness, as well as cold stamping and machinability are also quite good.

2. In fact, 16Mn steel contains more manganese than A3 steel, which will not only make 16Mn steel comparable to A3 steel in terms of plasticity and welding performance, but also improve some advantages of 16Mn steel in other aspects.

For example, higher yield strength, better corrosion resistance, low temperature impact toughness, etc., in these aspects, 16Mn steel has better quality than A3 steel, so people will also choose *16Mn steel plate.

The cancellation of Q235-B, in GB 713-2008, there is no Q235-B, so the selection of pressure vessels can not use Q235-B, but atmospheric vessels can continue to be used.

The difference between 16mnr, 16mn, and q345r:

1. Different uses.

Q345R steel is a special plate for pressure vessels with a yield strength of 345MPa, which has good comprehensive mechanical properties and process properties. 16mnr is an ordinary low-alloy steel, which is a special steel for boilers and pressure vessels, and a common material for boilers and pressure vessels. 16Mn steel belongs to carbon-manganese steel, the carbon content is around the right, and the yield point is equal to 343MPa (the strength level belongs to 343MPa).

16Mn steel has less alloy content and good weldability, so it generally does not need to be preheated before welding. However, since the hardening tendency of 16mn steel is slightly greater than that of mild steel, preheating measures are required to prevent cold cracks when welding at low temperatures (such as winter open-air operations) or on large rigidity and thick structures.

2. The carbon content is different.

Niobium, vanadium and titanium elements can be added to the Q345R steel plate, and their content should be filled in the quality certificate, and the sum of the above three elements should not be greater than12%。

16MN is: 16MN is called low-alloy high-strength structural steel: the carbon content is guessed, and the main alloying elements manganese (MN), silicon (Si), vanadium (V), niobium (NB) and titanium (Ti) are added.

16mnr is an ordinary low-alloy steel, which is a special steel for boilers and pressure vessels, and a common material for boilers and pressure vessels.

3. The performance is different.

Q345R is an ordinary low-alloy steel, which is a commonly used steel skin rotten material for boilers and pressure vessels, and the delivery status is divided into: hot-rolled or normalized, which is a low-alloy steel. The performance is similar to that of Q345 (16Mn) (the yield strength of 16mm steel plate is greater than 345MPa), the tensile strength is between (510-640), the elongation is greater than 21%, and the zero-degree V-type impact energy is greater than 34J.

The hardening tendency of 16mn steel is slightly greater than that of mild steel, so preheating measures are required to prevent cold cracks when welding at low temperatures (such as winter open-air operations) or on large rigidity and thick structures.

16mnr steel is a special plate for pressure vessels with a yield strength of 340MPa, which has good comprehensive mechanical properties and process properties. The phosphorus and sulfur content is slightly lower than that of ordinary 16Mn steel, in addition to the tensile strength and elongation requirements are higher than those of ordinary 16Mn steel, and the impact toughness is also required.

16Mn steel plate belongs to a steel plate made of 16Mn low-alloy structural steel.

The comprehensive mechanical properties, welding performance and low-temperature impact toughness of 16Mn steel plate, as well as cold stamping and machinability are also quite good, in fact, 1Mn steel contains more components than A3 steel, in addition to making 16Mn steel comparable to A3 steel in terms of plasticity and welding performance, etc., but also improves some advantages of 16Mn steel in other aspects of filial piety.

16Mn steel plate has higher yield strength, better corrosion resistance, low temperature impact toughness, in these aspects 16Mn steel has better quality than A3 steel, so people will also choose 16Mn steel plate when choosing. The notch sensitivity of 16mn steel is greater, when there is a notch, it will be very easy to cause cracks, and the fatigue resistance is poor, so when processing, it is necessary to pay attention to choosing a reasonable processing method to avoid carefully affecting the quality of the product.

Introduction to the composition content of 16mn steel plate:

16MN is called low-alloy high-strength structural steel, which is a material in steel. The carbon content of low-alloy high-strength structural steel is manganese, silicon, vanadium, niobium and titanium, etc., which are the main alloying elements. 16mn steel has less alloy content and generally does not need to be preheated before welding.

16Mn steel is the most widely used low-alloy steel in China, and the 16Mn steel used to make welded structures are both 16MNr and 16Mng steel.

Its total alloy content is <3%, and it is divided into 4 grades such as 450MPa according to the strength, mainly Q295, Q345, Q390, Q420, which is the yield of the Chinese pinyin capital prefix, followed by the number of the minimum yield point S value of the grade, and the subsequent symbol is divided into A, B, C, D four according to the steel impurity element sulfur and phosphorus content from high to low and accompanied by the change of carbon and manganese elements. Among them, grade A and B steel are usually called 16MN.

The above content reference: Encyclopedia - 16mn

<>16mn is an alloy structural steel with a carbon content. Other elements include silicon, vanadium, niobium and titanium, also known as low-alloy high-strength structural steel, the grade is Q345B, the yield point is 343MPa, and the density is cubic centimeters. The content of sulfur and phosphorus in 16mn is relatively high, both of which are harmful elements in steel, and it is easy to make the steel pipe green in the low temperature environment, which affects the working performance, and the advantage is that the comprehensive performance is good, the low temperature performance is good, the cold stamping performance is good, the welding performance and the machinability are good.

Now it is widely used in mining, transportation, chemical and other machinery.