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Q195, Q215, Q235, Q255 and Q275 in the material What is the difference?
Carbon steel structural steel is the most widely used, the maximum number of, often rolled into steel, shapes and sections, generally does not require the use of direct heat treated, mainly for construction and general engineering.
Respectively steel grades Q195, Q215, Q235, Q255 and Q275, etc., steel grades by the representative of the yield point of the letter (Q), the yield point value, quality, quality symbols (A, B, C, D) deoxy method symbol sequence composed of four parts. From the chemical composition of stars, low-carbon steel grades Q195, Q215, Q235, Q255 and Q275 grade large carbon content, manganese content, the more stable its plasticity. From the mechanical properties of points, more than the thickness of ≤16mm grades that yield point steel. The tensile strength were: 315-430,335-450,375-500,410-550,490-630 (obN / mm2); qi elongation were: 33,31,26,24,20 ( 0.5%). Therefore, when introduction of steel to customers, to remind customers to buy different materials depending on the desired product of the steel material, so as not to affect product quality.
What is the difference between material Q235A and Q235B's?
Q235A and Q235B steel belong to carbon steel. In the national standard GB700-88, the material on Q235A and Q235B main distinction in terms of carbon steel, the carbon content of the material as a material Q235A between 0.14-0.22%; Q235B material impact do experiments, but often do impact test temperature, V-notch. Relatively speaking, the mechanical properties of the material is Q235B steel is much better than the material for the Q235A steel. In general, the steel factory before the finished profiles are made on the identification plate logo. Users can determine the material on the identification card is Q235A, or Q235B, or other materials.
Japanese steel grades are SPHC, SPHD, and so they represent what does this mean?
Japanese steel (JIS series) grades in the general structural steel is mainly composed of three parts: the first part indicates the material, such as: S (Steel) represents steel, F (Ferrum) represents iron. The second part represents the different shapes, kinds, uses, such as P (plate) display plate, T (tube), K (kogu) expressed tool. The third part of Table feature figures, usually minimum tensile strength. Such as: ss400- first s represents steel (Ssteel), represents the second s "structural" (Structuree), 400 is offline tensile strength of ordinary structural steel 400Mpa. Wherein: sphc ---- first S Steel Steel abbreviation, P is the abbreviation plate Pate, H is the heat Heat acronym, Commercial acronym, expressed general overall hot rolled and strip.
SPHD ----- indicates stamping rolled steel sheet and strip.
SPHE ------ expressed deep drawing hot-rolled steel sheet and strip.
SPCC ------ expressed general cold rolled carbon steel sheet and strip, equivalent to China Q195-215A grades. Wherein the third letter C for the Cold abbreviation of the need to ensure tensile experiments at the end of grades plus T is SPCCT.
SPCD ------ represents punch cold-rolled carbon steel and strip, equivalent to China 08AL (13237) quality carbon structural steel.
SPCE ------ expressed deep drawing cold rolled carbon steel sheet and strip, equivalent to China 08AL (5213) red steel. The need to ensure the effectiveness of non-resistance, the N is added at the end of grade SPCEN.
Cold-rolled carbon steel sheet and strip code, annealed state A, the standard quenching of S, 1/8 hard to 8,1 / 4 hard to 4,1 / 2 hard 2.
Surface processing code: matt finishing for the D, luster finishing of B. As SPCCT-SD represents standard quenched, generally with cold-rolled carbon sheet matt finish rolling. Again SPCCT-SB represents the standard conditioning, light processing, sought assurances that the mechanical properties of cold-rolled carbon sheet.
When the material is stressed, stress of the material increases with the increase of strain, was directly proportional to both, when the stress increases to a certain value, the occurrence of material yield, tensile stress and strain is no longer directly proportional, but within a certain range fluctuation, then the material fracture. The yield point of the material is elastic deformation and plastic deformation of the cut-off point.
(A) various grades of carbon structural steel main purposes:
1. Grade Q195, low carbon content, the intensity is not high, good ductility, toughness, workability and weldability. For rolled sheet and wire rod. Cold and hot rolled steel sheet and its zinc, tin and plastic composite made of thin steel plate of the original with the use of a large number of roof, decorative plates, common dust pipes, containers, drums, instrument case, switch boxes, protection cover, train cars and the like. Cold drawn into wire rod is more or galvanized low carbon steel wire made of galvanized low carbon steel wire for binding, or as a fixed tension steel wire mesh, such as rivets.
2. Grade Q215, Q195 slightly higher strength steel, use and Q195 same. In addition, large quantities as welded steel pipes, galvanized pipe, furnace brace, foot screws, bolts, nails, wood screws, punching iron hinges and other metal parts.
3. Grade Q235, carbonaceous moderate, better overall performance, strength, ductility and welding performance is better with the most versatile pan. Often rolled into wire rod or bar, the steel, flat steel, angles, beams, channels, steel and other steel window frames, thick steel plate. With the use of a large number of buildings and engineering structures. Or the construction of factories for the production of steel frame house, high-voltage transmission towers, bridges, vehicles, boilers, containers, ships, etc., are also widely used as the performance of less demanding mechanical parts. C, D grade steel but also for some professional use of steel.
4. Grade Q255, Q235 and performance similar to slightly improve strength, ductility decreased. A wide range of applications as good as Q235, mainly used for structural inspection and riveting.
5. Grade Q275, strength, high hardness, good abrasion resistance. For the manufacture of shafts, agricultural machinery, wear-resistant parts, then head rail cleats, pads, wheels, rollers and the like. (B) the main purpose of various grades of high-strength low-alloy structural steels
High strength low alloy structural steel, said the old standard low-alloy structural steel, also known as ordinary low-alloy structural steel.
1. Q295 grade steel, the steel contains only very small amounts of alloying elements, the intensity is not high, but good plasticity, cold bending, welding and corrosion resistance. Mainly used for building construction, industrial plants, low-pressure boilers, low and medium pressure chemical containers, tanks, pipes, cranes, tractors, vehicles and less demanding on the strength of general engineering structures.
2. Grade Q345, Q390 steel, mechanical properties, weldability, hot and cold processing performance and corrosion resistance are good, C, D, E grade steel has good low temperature toughness. Mainly used for ships, boilers, pressure vessels, oil tanks, bridges, power station equipment, material handling equipment and other welded structure of high load.
3. Q420 grade steel, high strength, especially with high mechanical properties in the normalized or normalized and tempered condition. Mainly used for large ships, bridges, power station equipment, medium and high pressure boilers, pressure vessels, locomotives, lifting machinery, mining machinery and other large welded structure.
4. Q460 grade steel for maximum strength and at normalized, normalized and tempered or quenched and tempered condition has high mechanical properties, all aluminum supplementary oxygen, quality grade C, D, E class, guaranteed spare steel steel with good toughness. For various large-scale engineering and structures that require high strength, load light structure.
Seamless steel pipe with distinction:
Mainly forming different process. Ordinary steel, such as water pipes, typically by a flat plate by bending welding together, you can find a seam in the above; generally thicker diameter spiral weld. The molten steel seamless pipe is generally molten state through an annular slit and then stretched out the backlog of processing such as molding process, so that no weld. In performance, especially compared with ordinary steel pipe greatly improve the bearing capacity, it is often being used for high-voltage equipment. Hydraulic equipment such as piping connections. Ordinary steel pipe welds is its weak link, the weld quality is also a major factor in its overall performance impact. People who lived in the north generally have had water pipe or heating pipe burst in the winter is cold experience explosive place are generally weld. Not seamless steel pipe.
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