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Knowledge of angle steel

更新日期:2013-06-25  浏览:1673

1.General introduction

Angle is built with carbon structural steel and it is a simple section steel, which is mainly used for metal components and the frame of the plant. In using, it requires good weld ability, plastic deformation and certain mechanical strength. Raw material for angle steel is low carbon steel billets and finished angle is the hot rolling, normalizing or hot-rolled state delivery.

2.Types and specifications
It is mainly divided into equilateral angle steel and not equilateral angle steel, among which unequal angle can be divided into unequal thickness and unequal thickness and rang
Angle specification is expressed by the side and the edge thickness size. At present domestic steel specifications for 2 - 20 cm in length, for the number, the same horn steel often has 2 - 7 different edge thickness. The actual size and the side inlet angle marked on both sides of the thickness and indicate the relevant standards. General side more than 12.5cm for large angle, 12.5cm - 5cm between the medium angle, length 5cm for small angle
Inlet and outlet angle steel orders to use commonly required in the specifications, the steel is carbon steel grades corresponding. In addition to standard number, the angle steel has no specific composition and performance series
Angle of delivery length divided scale, size two, domestic angle scale range of 3 - 9m, 4 - 12M, 4 - 19m, 6 - 19m four ranges according to the specifications of different. Japanese angle length selection range is 6 - 15m.
Section of unequal angle height calculated according to the long side of the wide not equilateral angle steel.
3. Import and export situation
China's import and export angle steel has a certain batch, mainly imported from Japan and Western Europe. Exports areas are mainly Hong Kong and Macao, steel products Southeast Asia, Latin America and Arabia countries. Export production enterprises mainly in Liaoning, Hebei, Beijing, Shanghai, Tianjin and other cities of the steel mill (mil).
Imported angle steels are mainly large, small angle and special shape angle, export products are mainly medium angle as No. 6, No. 7.
4. Appearance and quality requirement
The surface quality of steel angles of the standard provisions, may not exist generally require the use of harmful defects such as delamination, cracks, scarring, etc.
Angle geometry to allow the range of the standard deviation is also provided, including bending, edge, edge thickness, angle, theoretical weight of other items, and provides a significant angle not reverse.
5. Chemical composition inspection
 (1) Components: chemical composition angle the general structure with rolling steel series, the main test index for C, Mn, P, S four. According to the different content, different, generally is in the range of C < 0.22%, Mn: 0.30 - 0.65%, P < 0.060%, S < 0.060%.
 (2) Test method: the chemical composition, method for the determination of common standards GB223, JISG1211 - 1215, BS1837, BS manual 19, ГОСТ 22536 etc
6. Common product, standard
GB/T2101 - 89 (General requirements of acceptance, steel packaging, marking and certification); GB9787 - 88/GB9788 - 88 (steel equal / unequal angle size, shape, weight and tolerances); JISG3192 94 (hot rolled steel shape, size, weight and tolerance); DIN17100 80 (quality standard of common structure steel); ГОСТ 535 - 88 (technical conditions of ordinary carbon steel)
According to the standard requirements, angles should be a bundle of delivery, oil and gas pipeline the bundle passes and the same bunch length should be specified. Angle is generally within the bare delivery, transport and storage are required to pay attention to moisture.
7. Mechanical performance test
(1) Test method:
① Test method for tensile. Methods for the determination of common standards are GB/T228-87, JISZ2201, JISZ2241, ASTMA370, ГОСТ 1497, BS18, DIN50145; bending test method. Method for the determination of common standards GB/T232-88, JISZ2204, JISZ2248, ASTME290, ГОСТ 14019, DIN50111 etc.
② Bending test method. Methods for the determination of common standards are GB/T232-88, waterway construction pipe JISZ2204, JISZ2248, ASTME290 and ГОСТ 14019, DIN50111 etc.
(2) Performance indicators: assessing the performance of the test angle mainly for the tensile test and bending test. Indicators include the yield point, tensile strength, elongation and bending of qualified.
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