I. Steel Plate and Strip Steel plate is divided into thick steel plate, thin steel plate and flat steel, its specifications with the symbol “a” and width x thickness x length in millimeters. Such as: a 300x10x3000 that the width of 300mm, thickness of 10mm, length of 3000mm steel plate.
Thick steel plate: thickness greater than 4mm, width 600~3000mm, length 4~12m.Thin steel plate: thickness less than 4mm, width 500~1500mm, length 0.5~4m. Flat steel: thickness 4~60mm, width 12~200mm, length 3~9m. Steel plates and strips are categorized according to the rolling method: cold rolled plates and hot rolled plates; according to the thickness: thin steel plates (below 4mm), thick steel plates (4-60mm), extra thick plates (above 60mm)
2. hot-rolled steel 2.1 I-beamI-beam steel as its name suggests, is an I-shaped cross-section profiles, the upper and lower flanges are flush.I-beam steel is divided into ordinary, light and wing width of three kinds, with the symbol “work” and the number of said. Which number represents the section height of the number of centimeters. 20 and 32 above the ordinary I-beam, the same number and divided into a, b and a, b, c type, its web thickness and flange width are respectively incremental 2mm. such as T36a that the cross-section height of 360 mm, the web thickness of a class of ordinary I-beam. I-beams should try to use the thinnest web thickness of type a, which is due to its light weight, while the cross-section moment of inertia is relatively large.The moment of inertia and radius of gyration of I-beams in the width direction are much smaller than those in the height direction. Thus, there are some limitations in the application, generally appropriate for one-way bending members.
3. channel steel Channel steel is divided into two kinds of ordinary channel steel and lightweight channel steel. Channel steel type with the symbol “[”” and the number of said. The same with the I-beam, the number of centimeters also represents the height of the cross-section. Such as [20 and Q [20 respectively, on behalf of the section height of 200mm of ordinary channel steel and light channel steel. 14 and more than 24 ordinary channel steel, the same number of sub-a, b and a, b, c type, the meaning of the same with the I-beam.
4. angle steel Angle steel is divided into two kinds of equilateral angle steel and unequal angle steel. Equilateral angle: its mutually perpendicular two limbs of equal length, its model with the symbol “L” and limb width x limb thickness in millimeters, such as L100x10 for the limb width of 100mm, limb thickness of 10mm equilateral angle.Unequal angles: its mutually perpendicular two limbs are not equal, the model with the symbol “ ” and long limb width x short limb width x limb thickness in millimeters, such as L100x80x8 for the long limb width of 100mm, short limb width of 80mm, limb thickness of 8mm unequal angle.
5. H-beam (rolled and welded)H-beam is different from I-beam.(1) wide flange, so there has been a wide flange I-beam said.(2) The inner surface of the flange does not need to have a slope, the upper and lower surfaces are parallel. (3) from the form of material distribution, I-beam cross-section of the material is mainly concentrated in the web around, the more to the sides of the extension, the less steel, and rolled H-beam, the material distribution focus on the edge of the part. Because of this, H-beam cross-section characteristics are obviously superior to the traditional work, channel, angle and their combination of cross-section, the use of better economic results. According to the current national standard “hot rolled H-beam and section T-beam” (GB/T11263-2005), H-beam is divided into four categories, which are designated as follows: wide flange H-beam – HW (W for Wide English prefix), specifications from 100mmx100mm ~ 400mmx400mm; middle flange H-beam – HM (M for Middle English prefix), specifications from Specification from 150mmX100mm~600mmX300mm: Narrow Cui-edge H-beam – HN (N for Narrow English prefix); thin-walled H-beam – HT (T for Thin English prefix). H-beam specification marking is used: H and the value of the height of h value x the width of b value x the value of the thickness of the web t value x the value of the thickness of the flange t2 value said.
Such as H800x300x14x26, that is, for the section height of 800mm, flange width of 300mm, web thickness of 14mm, flange thickness of 26mm H-beam. Or expressed first with the symbols HWHM and HN said H-beam category, followed by “height (mm) x width (mm)”, such as HW300x300, that is, the section height of 300mm, flange width of 300mm wide flange H-beam.
6. T-beam Sectional T-beam (Figure) is divided into three categories, the code is as follows: wide flange part of the T-beam – TW (W for Wide English head); in the flange part of the T-beam – TM (M for Middle English head); narrow flange part of the T-beam – TN (N for Narrow English head). Sectional T-beam by the corresponding H-beam along the middle of the web equal split into. Sectional T-beam specifications marked with: T and height h value x width b value x web thickness t value x flange thickness t value. Such as T248x199x9x14, that is, for the section height of 248mm, the wing width of 199mm, web thickness of 9mm, flange thickness of 14mm T-beam. Can also be used with the H-beam similar representation, such as TN225x200 that is, the section height of 225mm, flange width of 200mm narrow flange section T-beam.
7. structural steel pipe Steel pipe as an important part of iron and steel products, due to its manufacturing process and the shape of the pipe used in different bad and is divided into seamless steel pipe (round bad) and welded steel pipe (plate, with bad) two categories, see Figure. Steel structure commonly used in hot-rolled seamless steel pipe and welded steel pipe, welded steel pipe rolled and welded from the steel strip, according to the size of the pipe diameter, and is divided into two kinds of straight seam welding and spiral welding. LSAW steel pipe specifications for the outer diameter of 32 ~ 152mm, wall thickness of 20 ~ 5.5mm. national standards for the “LSAW steel pipe” (GB/T13793-2008). Structural seamless steel pipe according to the national standard “structural seamless steel pipe” (GB/T8162-2008), there are two kinds of hot-rolled and cold-drawn, cold-drawn pipe is limited to small pipe diameter, hot-rolled seamless steel pipe outer diameter of 32 ~ 630mm, wall thickness of 25 ~ 75mm. Specifications outside diameter x wall thickness (mm), such as φ102×5. Welded steel pipe is bent and welded by the steel strip, the price is relatively low. Steel pipe cross-section symmetry eye area distribution is reasonable, the moment of inertia in all directions and the radius of gyration is the same and larger, so the performance of the force, especially when the axial pressure is better, and its curve shape makes it less resistance to wind, waves, ice, but the price is more expensive and the connection structure is often more complex.
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