q345b Channel steel-Shandong Charming Steel Co.,Ltd.

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q345b Channel steel

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Carbon steel profile

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Details description

Channel steel Product Description

Q345 channel steel is a kind of steel material. It is a carbon alloy steel (c<0.2%) with good overall performance, good low temperature performance, cold stamping performance, welding performance and machinability. It is widely used in bridges, vehicles, ships, buildings, pressure vessels, etc. Q represents the yield of this material, and the latter 345 refers to the yield value of this material, which is around 345MPa. And as the thickness of the material increases, its yield value decreases.
① 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, and the following number represents the value of the yield point in MPa. For example, Q235 represents the carbon structural steel I with a yield point (Rel) of 235 MPa. When the brick carving requires the steel plate to have thickness direction performance, add the symbol representing the thickness direction (Z direction) performance level after the grade, for example: Q345BZ15.
②If necessary, a symbol indicating the quality level and deoxidation method can be marked after the steel number. The quality grade symbols are A, B, C, D, E. Symbol of deoxidation method: F means boiling steel; b means semi-killed steel: Z means killed steel; TZ means special killed steel. Killed steel may not be marked with symbols, that is, both Z and TZ may not be marked. For example, Q235-AF means A-grade boiling steel.
③ Carbon steel for special purposes, such as bridge steel, ship steel, etc., basically adopts the expression method of carbon structural steel, but the letter indicating the purpose is added at the end of the steel number.

① The two digits at the beginning of the steel number indicate the carbon content of the steel, expressed in ten-thousandths of the average carbon content. For example, for steel with an average carbon content of 0.45%, the steel number is "45", which is not a sequence number, so it cannot be read as 45 steel can be read as 45 steel.
②High-quality carbon structural steel with high manganese content should be marked with manganese, such as 50Mn.
③ Boiling steel, semi-killed steel and high-quality carbon structural steel for special purposes should be specially marked at the end of the steel number. For example, the steel number of semi-killed steel with an average carbon content of 0.1% is 10b.

Sheet size

Product introduction of Q345B steel plate : Q345A (GB/T 1591-1994) ω/% Performance and application: similar to the naming method of Q235. Q345a, Q345b, Q345c, Q345d, Q345e. This is a distinction between levels, and what it represents is mainly the impact temperature is different. Q345a level is no impact; Q345b level is 20 degrees normal temperature impact; Q345c level is 0 degrees impact; Q345d level is -20 degrees impact; Q345e level is -40 degrees impact. At different impact temperatures, the impact values are also different.

In the plate, it belongs to the low alloy series. Among low-alloy materials, this material is the most common. Q345 used to be called 16mn .

1. Sheet size

Material	thickness	width	length
Q345B	185	3815	0322
Q345B	10	2200	10800
Q345B	15	2000	10700
Q345B	20	2350	12000
Q345B	185	3815	0322
Q345B	40	2520	11640
Q345B	50	2600	11600
Q345B	60	2300	11100
Q345B	70	2120	9050
Q345B	80	2540	12200
Q345B	90	2200	10200
Q345B	100	2550	10300
Q345B	120	2360	9200
Q345B	150	2580	6700
Q345B	186	3851	0901
Q345B	200	2380	7910
Q345B	220	2360	7390
Q345B	240	2380	7250
Q345B	260	2370	6500
Q345B	270	2300	6210
Q345B	280	2260	6480
Q345B	320	1950	6000

2. Chemical composition

Grade

Q345A

≤ 0.20

≤0.50

≤1.70

≤0.035

≤0.15

≤0.07

≤0.20

≤0.30

≤0.50

≤0.30

Q345B

≤ 0.20

≤0.50

≤1.70

≤0.035

0.035

≤0.15

≤0.07

≤0.20

≤0.30

≤0.50

≤0.30

Q345C

≤0.20

≤0.50

≤1.70

≤0.030

≤0.15

≤0.07

≥0.015

≤0.20

≤0.30

≤0.50

≤0.30

Q345D

0.18

≤0.50

≤1.70

≤0.030

≤0.025

≤0.15

≤0.07

≥0.015

≤0.20

≤0.30

≤0.50

≤0.30

Q345E

≤0.18

≤0.50

≤1.70

≤0.025

≤0.020

≤0.15

≤0.07

≥0.015

≤0.20

≤0.30

≤0.50

≤0.30

Three, mechanical properties

Yield strength: ≤16mm: greater than 345, 16-40mm: greater than 335, 40-63mm: greater than 325, 63-80mm: greater than 315,

80-100m: greater than 305, 100-150mm: greater than 285, 150-200mm: greater than 275.

Tensile strength: 470-630.

Elongation: greater than 17.

Impact test: Test temperature: 20°C: greater than 34.

Four, implementation standards:

The external implementation standard of Q345 is: gb709, and the internal implementation standard is: gb/t1591-94. Due to the implementation of the standard, this steel plate is allowed to be delivered with negative tolerances. The latest implementation standard is GB/T1591-2018.

Another: Q345 latest standard GB/T1591-2018 Compared with the old standard, Q355 steel grade is used instead of Q345 steel grade. The most obvious change is the change of Mn content, which is adjusted from 1.0-1.60 to ≤1.60, canceling the minimum Limit of value.

With the discovery of modern industry and the continuous advancement of science and technology, various trace elements are more widely used in steel plates. Mn content is no longer a factor that affects the strength and mechanical properties of steel. Therefore, the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and the National Standardization Administration of the People's Republic of China jointly issued the implementation of the low-alloy high-strength structural steel standard, canceling the limit of Mn content range, and only stipulating the maximum value.

For the testing of Q345 steel, on the one hand, whether the element content of the steel meets the requirements of the national standard, and the most important aspect is whether the mechanical properties (yield strength, tensile test) of the steel meet the standards through professional institutions.

Five, the difference between Q235 and Q345

Different: The lower limit of the yield strength of Q235 is 235mpa, and the lower limit of the yield strength of Q345 is 345mpa (the meaning of Q is the Chinese character "buckle", and the following value represents the lower limit of yield strength)

The alloy content of the two is different: Q235 is ordinary carbon steel, and Q345 is low alloy steel. (Compared with the old standard 1591-88 grades 12mnv, 16mn 16mnre, 18nb, 14mnnb)

Six, performance and application

Q235--Metal structural parts, carburized or cyanide parts with low core strength requirements, tie rods, connecting rods, hooks, couplers, bolts and nuts, sleeves, shafts and welded parts.

Q345--Good comprehensive mechanical properties, low temperature performance, good plasticity and weldability, used as medium and low pressure vessels, oil tanks, vehicles, cranes, mining machinery, power stations, bridges and other structures that bear dynamic loads, mechanical parts, and building structures , General metal structural parts, hot-rolled or normalized, can be used for various structures in cold areas below -40℃.

If the structure is strength control, consider adopting Q345, if the structure is stiffness control, consider adopting Q235. The price Q345 is a bit more expensive, but because of its high strength, it can save materials. Specific selection can be comprehensively compared from the above points.

①. It is widely used in bridges, vehicles, ships, buildings, pressure vessels, etc. ②. Suitable for hot rolling, controlled rolling, normalizing, normalizing and tempering, and quenched steel sheets, steel strips, section steels and steel bars with a thickness not less than 3mm for engineering steel and general structural use.

High-strength steel

edit

① The representation method of steel grade is basically the same as that of alloy structural steel.

②For professional low-alloy high-strength steel , it should be indicated at the end of the steel number. For example, 16Mn steel, the special steel grade for bridges is "16MnQ", the special steel grade for automobile beams is "16MnL", and the special steel grade for pressure vessels is "16MnR".

Spring steel

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Spring steel can be divided into two types: carbon spring steel and alloy spring steel according to its chemical composition. The steel number expression method of the former is basically the same as that of high-quality carbon structural steel, and the latter is basically the same as that of alloy structural steel.

Bearing steel

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①The steel number is prefixed with the letter "G", which indicates the type of rolling bearing steel.

②The carbon content of high-carbon chromium bearing steel grades is not marked, and the chromium content is expressed in parts per thousand. For example, GCr15. The steel number representation method of carburized bearing steel is basically the same as that of alloy structural steel.

Alloy high speed

① When the average carbon content of alloy tool steel grades is ≥1.0%, the carbon content is not marked; when the average carbon content is <1.0%, it is expressed in parts per thousand. For example, Cr12, CrWMn, 9SiCr, 3Cr2W8V.

②The expression method of alloy element content in steel is basically the same as that of alloy structural steel. However, for alloy tool steel grades with lower chromium content, the chromium content is expressed in a few thousandths, and "0" is added to the number indicating the content in order to express it and the general element content in percentages. Differentiate. For example, Cr06.

③ The steel grades of high-speed tool steels generally do not indicate the carbon content, only a few percent of the average content of various alloying elements. For example, the steel grade of tungsten high-speed steel is expressed as "W18Cr4V". Steel grades with the letter "C" indicate that their carbon content is higher than that of general steel grades without a "C".

Heat-resistant steel

edit

① The carbon content in steel grades is expressed in parts per thousand. For example, the average carbon content of "2Cr13" steel is 0.2%; if the carbon content of the steel is ≤0.03% or ≤0.08%, the steel number is prefixed with "00" and "0" respectively, such as 00Cr17Ni14Mo2, 0Cr18 Ni9, etc. .

②The main alloying elements in steel are expressed in a few percent, while titanium, niobium, zirconium, nitrogen... etc. are marked according to the above-mentioned method of expressing microalloying elements in alloy structural steel.

Welding Rod Steel

Its steel number is prefixed with the letter "H" to distinguish it from other steels. For example, the stainless steel welding wire is "H2Cr13", which can be distinguished from the stainless steel "2Cr13".

Electrical silicon steel

①The steel number is composed of letters and numbers. The head letter DR of the steel number indicates hot-rolled silicon steel for electrical purposes, DW indicates cold-rolled non-oriented silicon steel for electrical purposes, and DQ indicates cold-rolled oriented silicon steel for electrical purposes.

②The number after the letter represents 100 times the iron loss value (W/kg).

③If the letter "G" is added to the end of the steel number, it means that the test is performed at a high frequency; if no "G" is added, it means that the test is performed at a frequency of 50 cycles.

For example, steel number DW470 indicates that the maximum iron loss per unit weight of cold-rolled non-oriented silicon steel products for electrical purposes at a frequency of 50 Hz is 4.7W/kg.

Factory appearance

Packing & Delivery

Our Company

Shandong Chengming Steel Co.,Ltd

Our company supplies cold/hot-rolled stainless steel sheets,stainless steel bars ,stainless steel coil stainless steel pipes,lead plate,bearing steel,spring steel,steel plate pile,tank plate,alloy steel plate,weather resistant steel plate and wear resistant plate to many steel factories from at home and abroad, including Shanxi Taigang Iron& Steel CO,.LTD (TISCO) Zhangjiagang Pohang (ZPSS), Shanghai Krupp, Ningbo Baoxin and steel factories in Taiwan area, Mainland Chinese and foreign countries and regions.

Our annual capacity is 25, 000 tons. The Annual Domestic Sale is 20 million, Annual Exported Sale about 12 million dollars.Our products supplied to more than 20 countries, such as Indonesia, Spain, Japan, Korea, Vietnam, Italy, Israel,Australia, Malaysia, Brazil, Pakistan, U. A. E, Peru, India etc. Good quality has been getting more and more prise from buyers at home and abroad.Our long-term business lines are 304 .202, 201 .430.409L, 304L, 316L, 309S and 310S, Finish: 2B ,BA ,NO.1 NO.4 ,HL, NO.8 and so on . For the sheets and coils,the thickness ranging from 0.3mm to 100mm.For the bars,the diameter ranging from 1mm to 300mm.For the pipes ,we have seamless pipe and weld pipe. Meanwhile, our company is also engaged in the long-term supply of homemade & imported medium and thick plates,galvanized or carbon

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The steel sheet pile is a kind of steel structure with a linkage device on the edge, and this linkage device can be freely combined to form a continuous and compact steel structure with a retaining wall or a water retaining wall.

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