GB/T 2597-1994 Hot-rolled steel sections for window frames

This standard specifies the dimensions, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of hot-rolled steel for building window frames. This standard applies to hot-rolled steel for building steel window and steel door frame components (hereinafter referred to as window frame steel). GB/T 2597-1994 Hot-rolled steel for window frames GB/T2597-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Hot-rolled steel for window frames
Heat-rolled wlndow sash steel1 Subject content and applicable scope
CB/T 2597
Generation GB 2597 ~S1
This standard specifies the dimensions, appearance, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of hot-rolled steel for building window frames.
This standard applies to hot-rolled steel for building steel window and steel door frame components (hereinafter referred to as hot-rolled steel frame). 2 Reference standards
GB 222 Sampling method for chemical analysis of indium and allowable deviation of chemical composition of finished products GB223 Chemical analysis methods for steel and alloys
GB228 Metal tensile test method
GB232 Metal bending test method
GB2101 General provisions for acceptance, packaging, marking and quality certificate of steel GB2975
Sampling provisions for mechanical and process performance tests of steel GB 6397
Metal tensile test specimens
·3 Models and grades
3.1 The model of window frame steel consists of series and type, expressed in 4 Arabic numerals. The first two digits represent the height dimension (mm), which is called the series, and the last two digits represent the cross-sectional shape, which is called the type. The letters (a, b) after the model digits represent the sequence number with the same conductor and different width dimensions.
3.2 The steel grades of window frames are composed of Chinese phonetic letters and Arabic numerals, with "CK" as the front prefix (C\, "K\" are the first letters of the Chinese phonetic letters of "window" and "frame" respectively), and the following three digits represent the strength grade of the steel of window frames. If rimmed steel or semi-killed steel is used, "F\ or \}" shall be added to the end of the grade respectively.bZxz.net
4 Dimensions, shape, weight and allowable deviations
4.1 Dimensions
4.1.1 Sectional dimensions and allowable deviations
4.1.1.1 Sectional dimensions, section area, theoretical weight and section characteristic parameters of window frame steel shall comply with the provisions of Table 1. Approved by the State Bureau of Technical Supervision on December 22, 1994 and implemented on October 1, 1995
Sectional area
Theoretical weight
Note: i I—abstract moment, W—section coefficient; ZGB/T 2597-94
Reference value
Center of gravity,
②Theoretical weight is calculated based on a density of 7.85 x/etm. W..cm
Iy,cmt
GB/T 2597--94
4.1.1.2 The allowable deviation of the cross-sectional dimensions of window frame steel shall comply with the provisions of the various model drawings in this standard. Other types of window frame steel not listed in this standard may be supplied according to the requirements of the purchaser and after agreement between the supply and demand parties. If the supplier is limited by equipment conditions, the waist of the T-section window frame steel is allowed to have a slope of no more than 2.5% on each side. The nominal waist thickness b.
dimension refers to the end thickness of the waist.
The slope of the outer edge of the trough-shaped window frame steel leg shall not exceed 3%. c.
dT-shaped (including 6810) window frame steel, the asymmetric deviation of its axis to the bottom plate shall not exceed half of the width tolerance. e.
Window frame steel dimensions without indicating allowable deviations are only used as a design basis and are not subject to inspection. The edges of the window frame steel are allowed to have arcs that do not affect use. 4.1.2 Length and allowable deviation
4. 1.2,1 Normal length
The normal length of window frame steel is 3~8m.
4.1.2.2 Fixed length and multiple length
The fixed length or multiple length of window frame steel shall be agreed upon by both parties and shall be specified in the contract. The length tolerance is as follows: Length 6 m.
Length>6m
GB/T 2597-94
16.5 ± 0, B
19 = 0. 8
1+51-8
32 ± u. 8
GB/T2597-94
331114
13 = 0. 8
21.5 ± 08
31 ± 0.8
GB/T 2597 : 94
21.5±cent.8
17-5+08
47 ± 1
GB/T 259794
2.5= 0. 3
17.5 = 0. 8
7.5 ±0.8
GB/T 2597--94
25 = 0, month
34.5 ± 1.t
GB/T 2597--94
4.2 Appearance
4.2.1 Curvature
The curvature of the window frame steel shall not exceed 3mm per meter.
GB/T 2597 - 94
The total curvature of the window frame steel shall not exceed 0.3% of the total length. 4.2.2 Torsion
The torsion of the window frame steel shall not exceed 2° per meter
4.2.3 End
The end of the window frame steel shall be sheared straight, the bevel shall not exceed 3mm, and the burr shall not exceed 4mm. The end of the window frame steel sheared by a press is allowed to have local deformation.
4.2.4 The platform at the intersection of the bottom plate and the waist of the T-shaped window frame steel is not allowed. However, with the consent of the purchaser, the shoulder that does not affect the use is allowed to exist. The length of the shoulder is not checked.
4.3 Weight
Window frame steel shall be delivered by theoretical weight or actual weight, but it shall be specified in the contract. 5 Technical requirements
5.1 Grade and chemical composition
5.1.1 The grade and chemical composition (melting analysis) of window frame steel shall comply with the provisions of Table 2. Table 2
Chemical composition, tt||not more than
Denitrification method
5.1.1.1 The silicon content of boiling steel shall not exceed 0.07%, the silicon content of semi-killed steel shall not exceed 0.17%, and the lower limit of silicon content of killed steel is 0.12%. 5.1.1.2 The residual copper content in steel shall not exceed 0.35%. The chromium and chromium contents shall not exceed 0.30% respectively. If the supplier can guarantee it, no analysis is required.
5.1.2 Window grip steels of other specifications may be supplied upon agreement between the supplier and the buyer and with the information specified in the contract. 5.1.3 The allowable deviation of the chemical composition of the finished window frame steel shall comply with the relevant provisions of GB222. The deviation of the chemical composition of the finished rimmed steel frame steel is not guaranteed. 5.2 Smelting method
Steel is smelted in oxygen converter, open hearth or electric furnace. 5.3 Mechanical properties and process properties
5.3.1 The mechanical properties and process properties of window frame steel shall comply with the provisions of Table 3. Table 3
Mechanical properties
Tensile strength, %
Not less than
5.3.2 The bending test of window frame steel shall be carried out only when required by the buyer. 5.4 Surface quality
Elongation,
180Bending test
dBending center diameter
2Sample thickness
d = 0. 5xt
5.4.1The surface of the window frame shall not have cracks, folds, scars, inclusions and delamination, and the end face shall not have shrinkage holes. Other defects that do not affect the use are allowed to exist. The depth and height of the defects shall not exceed 0. 2 mm. 5.4.2The surface defects of the window frame steel shall be smooth and without edges and corners, but lateral removal shall not be carried out. The removal width shall not be less than 5 times the removal depth. The removal depth is calculated from the actual size and shall not exceed half of the tolerance of the window frame steel of that size. 6 Test method
6.1The sampling position of the window frame steel for multiple tests and the test force method shall comply with the provisions of Table 4. Table 4
Inspection items
Chemical composition
Controlled elongation test
Bending test
Sampling number, pcs
(per furnace number)
Sampling position
GB 222
GB6397
Full section or waist (referring to processing)
GB2975
Full section or waist (referring to processing)
Test method
GR 223
Test No. G639, P
Measuring tool with sufficient precision
6.2 Window frame steel mechanical properties or bending test specimens can be cut or not cut, and the width of the specimen for mechanical properties test shall not be less than 10mm.
7 Inspection rules
7.1 Inspection and acceptance
The inspection and acceptance of the bacterial frame shall be carried out by the supplier's technical supervision department. 7.2 Inspection location
The size of the window frame steel should be measured at 1:200mm from the end. 7.3 Batch rules
Window frame steel should be inspected in batches, and each batch is composed of the same model, smelting method and casting method. The difference in magnetic content of each tank number is not more than 0.02%, and the difference in manganese content is not more than 0.15%. The weight of each batch of window frame steel is not more than 60L.
7.4 Sampling quantity
The sampling quantity of each batch of window frame steel should comply with the provisions of Table 4. 7.5 Re-inspection and judgment rules
The re-inspection and judgment rules of window frame steel should comply with the relevant provisions of GB2101. 8 Packaging, marking and quality certificate
8.1 Packaging
1.1.1 Window frame steel should be delivered in bundles. Each window steel neck should be evenly tied with steel strips, wire rods or steel wires, and one end should be flush. Window frame steel can be first bundled into small bundles, and then several small bundles can be bundled into large bundles. 8. 1.2 In addition to the provisions of this standard, the packaging of window frame steel shall comply with the relevant provisions of GB2101. 8.2 Marking
Window frame steel bundles in small bundles and large bundles shall have labels. The front of the label shall clearly indicate the supplier's name (or "\mark"), brand, model, and batch number. B. 3 Quality certificate
The quality certificate of window frame steel shall comply with the provisions of GB2101.
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