The plastic Plasticity refers to the ability of a metal material to produce plastic deformation (permanent deformation) without damage under load. Hardness Hardness is a gauge of how hard or soft a metal material is. At present, the most commonly used method to determine hardness in production is the indenter hardness method, which is to use a certain geometric shape of the indenter head under a certain load into the surface of the tested metal materials, according to the degree of the indenter to determine its hardness value. Commonly used methods are Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV) and other methods. Fatigue The strength, plasticity, and hardness discussed above are indicators of the mechanical properties of metals under static loading. In fact, many machine parts are operated under cyclic loads, and fatigue can occur under these conditions. Impact toughness The load acting on the parts at a high speed is called impact load, and the ability of metal to resist damage under impact load is called impact toughness.1. Size: 15mmx15mm-300x300mm 2. Material: Carbon steel 3. Factory price1.carbon steel square tube The product description Carbon steel square tube is a kind of hollow square cross section light thin wall steel tube, also known as steel refrigeration bend section. It is made of Q235 hot rolled or cold rolled strip steel or coil plate as base material by cold bending forming and then by high frequency welding made of square section shape and size of steel. In addition to the thickening of the wall, the corner size and edge flatness of hot rolled extra-thick wall square tube reach or even exceed the level of resistance welding cold forming square tube. 2.carbon steel square tube use Carbon steel square tube is used in construction, machinery manufacturing, steel construction projects, shipbuilding, solar power generation support, steel structure engineering, power engineering, power plant, agricultural and chemical machinery, glass curtain wall, car chassis, airport, boiler construction, highway railings, housing construction, etc.1. Classification of square tube production process Square tube according to the production process: hot rolled seamless square tube, cold drawn seamless square tube, squeeze seamless square tube, welded square tube. The welded square pipe is divided into: (a) Divided by process -- arc welding square pipe, resistance welding square pipe (high frequency, low frequency), gas welding square pipe, furnace welding square pipe (b) Divided by weld -- straight seam welded square pipe, spiral welded square pipe 2. Material classification of square tube Square tube according to the material: plain carbon steel square tube, low alloy square tube. General carbon steel is divided into: Q195, Q215, Q235, SS400, 20# steel, 45# steel; Low alloy steel is divided into Q345, 16Mn, Q390, ST52-3, etc. 3. Standard classification of square tube production Square tube according to production standards: gb square tube, Japanese standard square tube, British system square tube, American standard square tube, European standard square tube, non-standard square tube. 4. Shape classification of square tube section Square pipes are classified according to section shape: (1) simple section square pipe -- square pipe, rectangular square pipe (2) complex section square tube - flower shaped square tube, open square tube, corrugated square tube, shaped square tube 5. Classification of square tube surface treatment Square tube according to the surface treatment: hot dip galvanized square tube, electric galvanized square tube, oil coated square tube, pickling square tube 6. Classification of square pipe use Square tubes are classified according to their uses -- square tubes for decoration, square tubes for machine tools, square tubes for mechanical industry, square tubes for chemical industry, square tubes for steel structures, square tubes for shipbuilding, square tubes for automobiles, square tubes for steel beams and columns, square tubes for special purposes 7. Classification of square tube wall thickness Square tubes are classified according to wall thickness - ultra thick wall square tubes, thick wall square tubes and thin wall square tubes| Size(mm) | Thickness(mm) | Size(mm) | Thickness(mm) | Size(mm) | Thickness (mm) | Size(mm) | Thickness (mm) |
| 20*20 | 1.0 | 60*60 50*70 40*80 50*80 70*70 60*80 100*40 | 1.3 | 120*120 140*80 160*80 75*150 100*150 160*60 | 2.5-2.75 | 33*450 300*500 400*400 | 4.5-5.75 |
| 1.3 | 1.4 | 3.0-4.0 | 7.5-11.75 | ||||
| 1.4 | 1.5 | 4.25-4.75 | 12.5-13.75 | ||||
| 1.5 | 1.7 | 5.25-6.0 | 14.5-14.75 | ||||
| 1.7 | 1.8 | 6.5-7.75 | 15.5-17.75 | ||||
| 2.0 | 2.0 | 9.5-15 | 450*450 200*600 300*600 400*500 400*600 500*500 | 4.5-4.75 | |||
| 25*25 20*30 | 1.3 | 2.2 | 130*130 80*180 140*140 150*150 200*100 | 2.5-2.75 | 7.5-7.75 | ||
| 1.4 | 2.5-4.0 | 3.0-3.25 | 9.5-9.75 | ||||
| 1.5 | 4.25-5.0 | 3.5-4.25 | 11.5-13.75 | ||||
| 1.7 | 5.25-6.0 | 4.5-9.25 | 14.5-15.75 | ||||
| 1.8 | 9.5-15 | 16.5-17.75 | |||||
| 2.0 | 90*90 75*75 80*80 60*90 60*100 50*100 60*120 50*120 80*100 | 1.3 | 160*160 180*180 250*100 200*150 | 2.5-2.75 | |||
| 2.2 | 1.5 | 3.5-5.0 | |||||
| 2.5-3.0 | 1.7 | 5.25-7.75 | |||||
| 30*30 20*40 30*40 25*40 | 1.3 | 1.8 | 9.5-15 | ||||
| 1.4 | 2.0 | 150*250 100*300 150*300 200*200 135*135 | 2.75 | ||||
| 1.5 | 2.2 | 3.0-3.25 | |||||
| 1.7 | 2.5-4.0 | 3.5-7.75 | |||||
| 1.8 | 4.25-5.0 | 9.5-12.5 | |||||
| 2.0 | 5.25-5.75 | 12.75-15.75 | |||||
| 2.2 | 7.5-7.75 | 200*300 250*250 100*400 200*250 | 3.52-3.75 | ||||
| 2.5-3.0 | 100*100 80*120 125*75 140*60 50*150 | 1.5 | 4.5-11.75 | ||||
| 25*50 40*40 30*50 30*60 40*50 40*60 50*50 | 1.3 | 1.7 | 12.5-14.75 | ||||
| 1.4 | 1.8 | 15.5-17.75 | |||||
| 1.5 | 2.0 | 200*350 200*400 300*300 250*350 | 4.75-7.75 | ||||
| 1.7 | 2.2 | 9.5-11.75 | |||||
| 1.8 | 2.5-5.0 | 12.5-14.75 | |||||
| 2.0 | 5.25-6.0 | 15.5-17.75 | |||||
| 2.2 | 6.5-7.75 | 300*350 300*400 350*350 250*450 | 4.75-7.75 | ||||
| 2.5-4.0 | 9.5-13 | 9.5-11.75 | |||||
| 4.25-5.0 | 12.5-14.75 |
| Item | Black square hollow section pipe |
| material | Q235B/Q345b/Ss400/A36/St37 |
| certifications | ISO9001 /SGS |
| standard | ASTM BS GB API |
| size(dia) | 15*15mm-300*300mm |
| item | black rectangular section pipe |
| size | 10*20mm-200*400mm |
| technique | welded ,ERW ,cold rolled .hot rolled |
| surface | Bared, Galvanized, Oiled,Or Other Anti-corrosive Treatment. We can produce other specifications according to customers requirements. |
| packaging | 1.Big OD:in bulk 2.Small OD:packed by steel strips 3.20"GP:5.85*2.2*2.2 40"GP:11.85*2.2*2.2 Black steel pipe: oiled/painted, in bundles and tarpaulin outside According to the requirements of customers |
| inspection | With Chemical Composition and Mechanical Properties Analysis; Hydrostatic Test, Dimensional and Visual Inspection, Also With Nondestructive Inspection. |
| Usage/Application | Mechanical & manufacture, Steel structure, Shipbuilding, Bridging ,Automobile chassis, Industrial water lines/plant piping, Vehicular chassis and frames, Idlers & belt conveyorsAgriculture and Irrigation, Scaffoldings, Electrical Cable conduits, Cooling towers, Antenna and Telecom Towers, Cold storages, Tabular polesFire Protection Systems, HVAC, Plumbing,Fabrication industry. |
| main market | North America South America Eastern Europe Southeast Asia Africa Oceania Mid East Eastern Asia Western Europe Central America Northern Europe Southern Europe South Asia Domestic Market |
| country of origin | china |
| Productivity | 5000tons per month |
| delivery time | within 15 working days after receiving the payment or 100% Irrevocable L/C at sight |