First, the angle iron introduction: the angle iron is usually called the angle iron, it is a long steel strip, both sides are perpendicular to each other.
Angle steel can be composed of various load-bearing members according to the different needs of the structure, and can also be used as the connection between members.
Widely used in a variety of building structures and engineering structures, such as machine room beams, bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, container racks, cable trench supports, power pipes, busbar brackets installation, and warehouse shelves, etc.
There are mainly two kinds of angle steel: equilateral angle steel and unequal angle steel.
Among them, unequal angle steel can be divided into two kinds: unequal edge thickness and unequal edge thickness.
As the name implies, equilateral angle steel is equal angle steel on both sides, and its specification is expressed in millimeters of side width * side width * side thickness.
For example: 30 * 30 * 3, which means equilateral angle steel, whose side width is 30mm, and its side thickness is 3mm.
It can also be represented by a model (number), where the model is the number of centimeters of the side width.
You can add the symbol "angle" in front of the angle steel model and the symbol "#" in the upper right corner after the model, for example: angle 3.
The specification range of equilateral angle steel is 2cm / 2mm.
An unequal angle steel is a long steel whose cross sections, such as the letter L, are perpendicular to each other and variable in width.
Its specification is expressed in millimeters of long side width * short side width * side thickness, such as "L30 * 20 * 3", which means long side width 30mm, short side width 20mm, unequal angle steel, edge thickness 3mm.
It can also be expressed as a model (number), where the model is expressed as a fraction, the numerator is the number of centimeters of the width of the long side, and the denominator is the number of centimeters of the width of the short side, for example, "L3 beat", where 3 is the number of centimeters of the long side and 2 is the number of centimeters of the short side.
The range of unequal angle steel is 2. 5 inch, 1. 6 inch, 20 inch, 12.
Application of angle steel.
Second, Import and Export China has imported and exported a certain amount of angle steel, mainly from Japan and Western Europe.
Exports are mainly sold to Hong Kong and Macau, Southeast Asia, Latin America and Arab countries.
The export manufacturers are mainly steel mills (rolling mills) in Liaoning, Hebei, Beijing, Shanghai, and other provinces and cities.
III. Appearance quality.
The standard specifies the surface quality of angle steel, which usually requires that there are no harmful defects in use, such as delamination, scars, cracks, etc.
It is also specified that the allowable deviation range of angle steel geometry is in the standard.
In general, it includes curvature, side width, side thickness, top angle, theoretical weight, etc., and stipulates that the angle steel must not be obviously distorted.
Application of angle steel.
The chemical composition of angle steel belongs to the series of rolled steel for general structure, and the main verification indexes are C, Mn, P and S.
The content varies according to different grades, and the approximate range is C < 0.22%, Mn:0.30-0.65%, P < 0.060%, S < 0.060%.
(1) Test method:
1 tensile test method.
The commonly used standard test methods are GB/T228-87, JISZ2201, JISZ2241, ASTMA370, BS18, DIN50145 and so on.
2bending test method.
The commonly used standard test methods are GB/T232-88, JISZ2204, JISZ2248, ASTME290, 14019, DIN50111 and so on.
(2) performance index: the main testing items for checking the properties of angle steel are tensile test and bending test.
The indexes include yield point, tensile strength, elongation, bending qualification and so on.
Weight per meter = 0.00785* (edge width + edge width-edge thickness) * edge thickness.
For example, 50'5 angle steel: (50'50 color 5) * 5 '0.00785 steel 3.73 (this algorithm can only roughly calculate the weight of angle steel, in fact, the hardware manual shall prevail!