First, the classification of profiles
1 . Simple section steel
1 Square steel - hot-rolled square steel, cold-drawn square steel; 2 round steel - hot-rolled round steel, forged round steel, cold drawn round steel
3 wire; 4 flat steel; 5 spring flat steel; 6 angle steel - equal angle steel, unequal angle steel;
8 hexagonal steel; 9 bowed steel; 10 oval steel
2 . Complex section steel
1 I-beam - ordinary I-beam, light I-beam
2 channel steel - hot-rolled channel steel (common channel steel, light channel steel), curved channel steel
3 H steel (also known as wide leg I-beam)
4 Rails - heavy rails, light rails, crane rails, other special rails
5 window frame steel
6 steel sheet piles
7 curved steel - cold-formed steel, hot-formed steel
8 others
Second, hot rolled ribbed steel
1 . Specifications
The grades of hot-rolled ribbed steel bars consist of HRB and the minimum yield point of the grade. H, R, and B are the English first letters of Hotrolled, Ribbed, and Bars, respectively. Hot-rolled ribbed steel bars are divided into three grades: HRB335 (old name is 20MnSi), HRB400 (old name is 20MnSiV, 20MnSiNb, 20MnTi) and HRB500.
2 . Vanadium Grade III Thread Reinforcement
1The market prospect of vanadium-grade III-grade threaded steel bars
New vanadium-bearing grade III rebars (20MnSiV, 400Mpa) incorporate vanadium, niobium, titanium and other alloys in the production process. Compared with ordinary grade II rebars, they have the advantages of high strength, good toughness, good welding performance and good seismic performance. . In the developed markets of Europe and other developed countries, Grade III rebar accounts for 80% of the total rebar. For countries such as the United Kingdom, Germany, Australia, Japan, etc., the use of high-strength vanadium-III grade rebar has reached 80-90%. In 1995, the original Ministry of Metallurgy and the Ministry of Construction jointly issued a document to promote the use of the Ministry of Construction will be the new tertiary rebar technology conditions into the national standard GBJ10-89 "Concrete Structural Design Code", implemented since January 1, 1997, is now new Grade III rebar has been successfully used in high-rise buildings, large-scale power plants, bridges, tunnels, airports and other engineering projects, and has a promising market prospect. The Ministry of Construction requires that the use of new Grade III steel bars in 2002 be up to 50% of the total amount of rebar, and 80% at the end of the 10th Five-year Plan. However, due to inadequate publicity and promotion, the amount of use is still much lower than that of the old Class II 335Mpa ordinary grade rebar. Therefore, it is necessary to vigorously promote and popularize the new Grade III rebar.
2 Advantages of vanadium-grade III steel
A, Economy: Due to its high strength, the use of new grade III rebar can save 10-15% of steel compared to Grade II rebar, thus reducing construction costs.
B, high strength, good toughness: the use of micro-alloying, the yield point above 400Mpa, tensile strength above 570Mpa, respectively, than the 2nd level rebar increase by 20%.
C. Seismic resistance: The vanadium-containing rebar has high bending resistance, aging performance, high low-cycle fatigue performance, and its seismic performance is significantly better than that of the grade II rebar.
D, easy to weld: due to carbon content ≤ 0.54%, good welding performance, adapt to various welding methods, the process is simple and convenient.
E. Convenient construction: The use of new Grade III rebar has increased the construction clearance and provided a guarantee for construction convenience and construction quality.
Third, hot-rolled H-shaped steel
1 . Hot-rolled H-beam representation
H-beams are classified into three types: wide flange H-beam (HK), narrow flange H-beam (HZ) and H-beam pile (HU). The expression method is: height H × width B × web thickness t1 × wing thickness t2, such as H-shaped steel Q235, SS400 200 × 200 × 8 × 12 is expressed as 200mm high 200mm width web thickness 8mm, thickness of 12mm Wide flanged H-beam, grade Q235 or SS400.
2 . Advantages of hot-rolled H-beam
H-beam is a new type of economic construction steel. The shape of H-section steel is economical and reasonable, and its mechanical properties are good. The points on the cross-section during rolling are evenly distributed and the internal stress is small. Compared with ordinary I-beams, they have the advantages of large section modulus, light weight, and metal-saving advantages. The structure is reduced by 30-40%; because the legs are parallel inside and outside, the leg ends are right angles, assembling and assembling into components can save welding and riveting workload by 25%. It is commonly used in large buildings (such as factory buildings, high-rise buildings, etc.) that require large bearing capacity, good section stability, and bridges, ships, lifting and transport machinery, equipment foundations, supports, and foundation piles.
IV. I-beam
I-beams are divided into ordinary I-beams and light I-beams. The specifications of hot-rolled I-beams are 10-63#. The standard hot-rolled I-beam supplied by the supplier and buyer is 12-55#. I-beam is widely used in various building structures, bridges, vehicles, supports, machinery and so on. I-beam, also called steel beam, is a long strip of steel with an I-shaped section. Its specifications are expressed in centimeters of waist height (h) * leg width (b) * waist thickness (d). For example, "Working 160*88*6" means that the waist height is 160 mm, the leg width is 88 mm, and the waist thickness is 6 mm I-beam. The specifications of the I-beam can also be expressed by the model. The model indicates the centimeters of the waist height, such as worker 16#. If the waist height of the I-beam, if there are several different leg width and waist thickness, need to add abc to the right of the model to be distinguished, such as 32a #, 32b #, 32c # and so on.
H- height R1- leg radius radius
B- leg width I- moment of inertia
D- Waist Thickness W- Sectional Coefficient
T-average leg thickness I-inertia radius
R- inner radius S-half cross-section static moment
1 . Simple section steel
1 Square steel - hot-rolled square steel, cold-drawn square steel; 2 round steel - hot-rolled round steel, forged round steel, cold drawn round steel
3 wire; 4 flat steel; 5 spring flat steel; 6 angle steel - equal angle steel, unequal angle steel;
8 hexagonal steel; 9 bowed steel; 10 oval steel
2 . Complex section steel
1 I-beam - ordinary I-beam, light I-beam
2 channel steel - hot-rolled channel steel (common channel steel, light channel steel), curved channel steel
3 H steel (also known as wide leg I-beam)
4 Rails - heavy rails, light rails, crane rails, other special rails
5 window frame steel
6 steel sheet piles
7 curved steel - cold-formed steel, hot-formed steel
8 others
Second, hot rolled ribbed steel
1 . Specifications
The grades of hot-rolled ribbed steel bars consist of HRB and the minimum yield point of the grade. H, R, and B are the English first letters of Hotrolled, Ribbed, and Bars, respectively. Hot-rolled ribbed steel bars are divided into three grades: HRB335 (old name is 20MnSi), HRB400 (old name is 20MnSiV, 20MnSiNb, 20MnTi) and HRB500.
2 . Vanadium Grade III Thread Reinforcement
1The market prospect of vanadium-grade III-grade threaded steel bars
New vanadium-bearing grade III rebars (20MnSiV, 400Mpa) incorporate vanadium, niobium, titanium and other alloys in the production process. Compared with ordinary grade II rebars, they have the advantages of high strength, good toughness, good welding performance and good seismic performance. . In the developed markets of Europe and other developed countries, Grade III rebar accounts for 80% of the total rebar. For countries such as the United Kingdom, Germany, Australia, Japan, etc., the use of high-strength vanadium-III grade rebar has reached 80-90%. In 1995, the original Ministry of Metallurgy and the Ministry of Construction jointly issued a document to promote the use of the Ministry of Construction will be the new tertiary rebar technology conditions into the national standard GBJ10-89 "Concrete Structural Design Code", implemented since January 1, 1997, is now new Grade III rebar has been successfully used in high-rise buildings, large-scale power plants, bridges, tunnels, airports and other engineering projects, and has a promising market prospect. The Ministry of Construction requires that the use of new Grade III steel bars in 2002 be up to 50% of the total amount of rebar, and 80% at the end of the 10th Five-year Plan. However, due to inadequate publicity and promotion, the amount of use is still much lower than that of the old Class II 335Mpa ordinary grade rebar. Therefore, it is necessary to vigorously promote and popularize the new Grade III rebar.
2 Advantages of vanadium-grade III steel
A, Economy: Due to its high strength, the use of new grade III rebar can save 10-15% of steel compared to Grade II rebar, thus reducing construction costs.
B, high strength, good toughness: the use of micro-alloying, the yield point above 400Mpa, tensile strength above 570Mpa, respectively, than the 2nd level rebar increase by 20%.
C. Seismic resistance: The vanadium-containing rebar has high bending resistance, aging performance, high low-cycle fatigue performance, and its seismic performance is significantly better than that of the grade II rebar.
D, easy to weld: due to carbon content ≤ 0.54%, good welding performance, adapt to various welding methods, the process is simple and convenient.
E. Convenient construction: The use of new Grade III rebar has increased the construction clearance and provided a guarantee for construction convenience and construction quality.
Third, hot-rolled H-shaped steel
1 . Hot-rolled H-beam representation
H-beams are classified into three types: wide flange H-beam (HK), narrow flange H-beam (HZ) and H-beam pile (HU). The expression method is: height H × width B × web thickness t1 × wing thickness t2, such as H-shaped steel Q235, SS400 200 × 200 × 8 × 12 is expressed as 200mm high 200mm width web thickness 8mm, thickness of 12mm Wide flanged H-beam, grade Q235 or SS400.
2 . Advantages of hot-rolled H-beam
H-beam is a new type of economic construction steel. The shape of H-section steel is economical and reasonable, and its mechanical properties are good. The points on the cross-section during rolling are evenly distributed and the internal stress is small. Compared with ordinary I-beams, they have the advantages of large section modulus, light weight, and metal-saving advantages. The structure is reduced by 30-40%; because the legs are parallel inside and outside, the leg ends are right angles, assembling and assembling into components can save welding and riveting workload by 25%. It is commonly used in large buildings (such as factory buildings, high-rise buildings, etc.) that require large bearing capacity, good section stability, and bridges, ships, lifting and transport machinery, equipment foundations, supports, and foundation piles.
IV. I-beam
I-beams are divided into ordinary I-beams and light I-beams. The specifications of hot-rolled I-beams are 10-63#. The standard hot-rolled I-beam supplied by the supplier and buyer is 12-55#. I-beam is widely used in various building structures, bridges, vehicles, supports, machinery and so on. I-beam, also called steel beam, is a long strip of steel with an I-shaped section. Its specifications are expressed in centimeters of waist height (h) * leg width (b) * waist thickness (d). For example, "Working 160*88*6" means that the waist height is 160 mm, the leg width is 88 mm, and the waist thickness is 6 mm I-beam. The specifications of the I-beam can also be expressed by the model. The model indicates the centimeters of the waist height, such as worker 16#. If the waist height of the I-beam, if there are several different leg width and waist thickness, need to add abc to the right of the model to be distinguished, such as 32a #, 32b #, 32c # and so on.
H- height R1- leg radius radius
B- leg width I- moment of inertia
D- Waist Thickness W- Sectional Coefficient
T-average leg thickness I-inertia radius
R- inner radius S-half cross-section static moment
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