Q235B square tube is a hollow square section steel tube, also known as steel refrigerated bending section. It is a section steel with square cross-section shape and size made of Q235B hot-rolled or cold-rolled strip or coil as the base material, formed by cold bending and then high-frequency welding. In addition to the thickening of the wall thickness of the hot-rolled extra-thick wall square pipe, the corner size and edge flatness reach or exceed the level of the resistance welded cold formed square pipe.
Applications:
Q235B square tube use: mechanical equipment manufacturing, glass curtain wall, marble curtain wall dry hanging, shipbuilding, cargo support, steel structure engineering, furniture manufacturing, medical equipment, agricultural and chemical machinery, auto parts, etc.
Q235B square tube seamless and welded Square tube:
The difference between Q235B square tube seamless and welded.
Seamless square tube is formed by extruding seamless round tube.
Plasticity
Q235B square plasticity refers to the ability of metal materials to produce plastic deformation (permanent deformation) without being damaged under load.
hardness
Q235B square hardness is a measure of the hardness of metal materials. At present, the most commonly used method for measuring hardness in production is the indentation hardness method, which uses an indenter of a certain geometric shape to press into the surface of the metal material to be tested under a certain load, and the hardness value is determined according to the degree of indentation.
The commonly used methods for Q235B include Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV).
Impact toughness
The load that the Q235B side acts on the machine at a great speed is called impact load, and the ability of metal to resist damage under the action of impact load is called impact toughness.
Strength
Q235B square strength refers to the resistance of metal materials to damage (excessive plastic deformation or fracture) under static load. Since the load acts in the form of tension, compression, bending, shearing, etc., the strength is also divided into tensile strength, compressive strength, bending strength, and shear strength. There is often a certain relationship between various strengths, and tensile strength is generally used as the most basic strength indicator in use.
1. It can execute the GB6728-2002 cold-formed hollow section steel standard for structure.
2. It can execute JISG3466-88 Japanese general construction square rectangular tube adaptability standard.
3. The executable European standards are EN10025-2-2004 and EN10025-3-20042.
Square tube calculation formula
Q235B square tube weight calculation formula: side length * 4 * wall thickness * 0.00785 * length = weight of each
Q235B rectangular tube weight calculation formula: (side length + side length) * 2 *. wall thickness * 0.00785 * length = weight of each
Note: The unit of side length and wall thickness is mm, the length is m, and the unit of weight is kg.
Mechanical character & Chemical element of normal material:
| Material Chemical Composition (%) |
Q195 | C | Mn | Si | S | P | |
| 0.06-0.12 | 0.25-0.50 | ≤0.30 | ≤0.050 | ≤0.045 | |||
| Tensile strength: 315-430(Mpa) | |||||||
| Yield strength:195(Mpa) | |||||||
| Elongation:33 | |||||||
| Q235 | C | Mn | Si | S | P | ||
| 0.12-2.0 | 0.3-0.70 | ≤0.30 | ≤0.045 | ≤0.045 | |||
| Tensile strength: 375-460(Mpa) | |||||||
| Yield strength:235(Mpa) | |||||||
| Elongation:26 | |||||||
| Q345 | C | Mn | Si | S | P | V | |
| ≤0.20 | ≤1.70 | ≤0.55 | ≤0.040 | ≤0.040 | 0.02-0.15 | ||
| Tensile strength: 470-630(Mpa) | |||||||
| Yield strength:345(Mpa) | |||||||
| Elongation:21 | |||||||
Q235B Square and Rectangular hollow sections Specification:
15*15*0.8-1.2
15*30*0.8*1.5
20*20*0.8-3.0
20*40*0.8*3.0
25*25*0.8-3.0
25*50*0.8*3.0
30*30*0.8-4.0
30*50*0.8*3.0
40*40*1.0-5.0
30*60*1.5-3.0
50*50*1.0-6.0
40*80*2.0-5.0
60*60*1.2-6.0
50*70*2.0-6.0
70*70*2.0-6.0
50*100*2.0-6.0
80*80*2.0-8.0
60*80*2.0-6.0
90*90*3.0-10
60*100*2.0-6.0
100*100*2.0-12
60*120*2.0-6.0
120*120*2.0-12
60*160*3.0-6.0
140*140*3.0-12
80*100*3.0-8.0
150*150*3.0-12
80*120*3.0-8.0
160*160*3.0-12
80*160*3.0-8
180*180*5.0-12
80*200*5.0-10
200*200*4.0-16
100*200*4.0-12
250*250*4.0-16
100*300*5.0-12
300*300*6.0-16
150*300*8.0*12
350*350*6.0-16
200*300*5.0-16
400*400*8.0-16
200*400*8.0-16
450*450*8.0-16
300*400*8.0-16
500*500*8.0-16
300*500*8.0-16
