16MN Plastic, Wayward, Tensile Strength

c：；；

Tensile strength: 470 660 Nm mm²;

Yield strength: 275 345 Nm mm²;

Elongation: 21%.

The specific value should be based on the thickness or diameter of the steel, and the thickness or diameter of the steel corresponding to the above data is: 16 100m

16MN steel plate (also known as Q345B) is a low-alloy structural steel, it has good comprehensive mechanical properties, welding performance and low-temperature impact toughness, cold stamping and machinability are good, compared with A3 steel, the composition is only a little more manganese, in addition to having the same good plasticity and weldability, and the yield strength is increased by about 50%, the atmospheric corrosion resistance is increased by about 20-38%, the low-temperature impact toughness is also superior to A3 steel, but its notch sensitivity is greater than that of carbon steel, when there is a gap, The fatigue strength is lower than that of A3 steel, and it is prone to cracks, so attention should be paid to it during processing. This type of steel is generally used in a hot-rolled or normalized state, and after normalizing, it can improve the processing properties of the steel, such as plasticity, low-temperature impact toughness or cold-pressed forming.

16mn is the old grade, and the corresponding new grade steel is low alloy steel Q345, and the corresponding parameters are the same.

Chemical composition of 16mn:

c：；；Tensile strength: 470 660 Nm mm²;

Yield strength: 275 345 Nm mm²;

Elongation: 21%.

The specific value should be based on the thickness or diameter of the steel, and the thickness or diameter of the steel corresponding to the above data is: 16 100mm.

Also consider in what state.

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.

Q345 and 16MN are a name for steel, and they have different starting points.

Q345 is named after the yield strength of steel, Q stands for yield strength (the first letter of the yield word), and 345 is the value of yield strength is 345.

And 16mn refers to the carbon content and the manganese content (.

In addition, the name of 16mn is the old national standard, that is, the previous name, because the previous national standard has requirements for the manganese content of this material, and the manganese content needs to be between (, and the new national standard has no requirements for the manganese content of this material, so it is not used to express 16mn, and Q345 is used instead.

1. Classified by quality grade: Q345 is ordinary quality low-alloy steel, and 16mn is high-quality low-alloy steel.

Q345 belongs to GB T1591-94 low-alloy high-strength structural steel. 16MN belongs to JB4726-2000 carbon steel low alloy steel forgings for pressure vessels. If you look at the standard, you should understand that the two steels are used differently.

Comparatively, 16mn thiophos content requirements are more stringent and quality requirements are more stringent. 16MN and Q345 are the same for general use, but only 16MN can be used for containers and boilers, because Q345 is not listed in GB150, and the procedures are very troublesome to use According to the characteristics of the classification, it is also a weldable low-alloy high-strength structural steel.

2. The starting point of the name is different.

Q345 and 16MN are a name for steel, their starting point is different, Q345 is named from the yield strength of steel, Q stands for yield strength (the first letter of the word buckling), 345 is the value of yield strength is 345. And 16mn refers to the carbon content and the manganese content (.

The name of 16mn is the old brand of the national standard, which is the previous name, because the previous national standard has requirements for the manganese content of this material, that is, the manganese content is between (, and the new national standard has no requirements for the manganese content of this material, so it is not used to express 16mn, and it is replaced by Q345.

3. Q345 is carbon steel, and its yield strength is 345MPa, and the steel has good plasticity.

16MN is a low-carbon alloy steel with good strength but poor plasticity.

It's the same kind of steel. Q345 is the new grade now, the old grade is low-alloy structural steel, and Q235 is ordinary carbon steel.

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 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.

Tensile strength: 470 660 Nm mm²;

Yield strength: 275 345 Nm mm²;

Elongation: 21%.

16MN seamless steel pipe is a low-alloy high-strength structural steel with a carbon content of 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 capital prefix of the word "yield", followed by the number is the minimum yield point (S) value of the grade, and the symbol followed by it is divided into A, B, C, D and so on according to the content of impurity elements (sulfur and phosphorus) in the steel from high to low and accompanied by the change of carbon and manganese elements. Among them, grade A and B steel are usually called the chemical composition of 16MN seamless steel pipe: C:

Mechanical properties of Liaocheng Zhenxing Steel Pipe ****** 16MN seamless steel pipe Area code 0635** Chemical composition of MN steel pipe: C:; Tensile Strength:

470 660 Nm mm²; Yield strength: 275 345 Nm mm²; Elongation: 21%.

The specific value depends on the thickness or diameter of the steel

Hebei Zhongtai steel pipe manufacturing **** area code 0317**2105577

There are 16MN grades in low-alloy structural steel GB1591 79, and 16Mn grades in low-alloy high-strength structural steels GB1591 1994, and 16Mn is modified to Q345 (A-E) grades.

20MN is also a former steel grade and is now equivalent to A105.

65mn, you can go to the encyclopedia to search for it, there is a detailed introduction in it.

16MN is based on Q235 with about 1% manganese, so the welding performance is good;

The welding performance of 16MN and ordinary carbon structural steel is similar, and knot 422, knot 423, knot 424, knot 425 can be used; For occasions with high strength, knot 506 and knot 507 are used.

Q235 ordinary carbon structural steel is also known as A3 plate.

Ordinary carbon structural steel plate is a kind of steel material.

Q represents the yield limit of this material, and the subsequent 235 refers to the yield value of this material, which is about 235MPa. And with the increase of the thickness of the material and its yield value decreases, due to the moderate carbon content, good comprehensive performance, strength, plasticity and welding and other properties are better matched, the most widely used.

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

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.

Q235 carbon structural steel, 15MN high-quality carbon structural steel, two kinds.

16mn has the highest tensile strength of 52kgf mm2

The tensile strength of 20g is the second, which is 41kgf mm2 (because there is a small amount of V, Mo and other strengthening elements compared to 20 steel).

20 steel is slightly lower at 40kgf mm2

No. 45 steel is more wear-resistant than 16mn.

Because No. 45 steel belongs to medium carbon steel. The higher the carbon content, the greater the hardness, and the higher the wear resistance.

16 Manganese belongs to low-alloy steel, which is an alloying element with an added mass fraction of 1% on the basis of Q235 manganese. The most significant increase is the yield point. Toughness.