This standard specifies the dimensions, shape, technical requirements, test methods and acceptance rules for hot-rolled carbon structural steel and low-alloy structural steel strips. This standard applies to hot-rolled carbon structural steel and low-alloy structural steel strips with a thickness of 2.00~6.00mm and a width of 50~600mm. GB/T 3524-1992 Hot-rolled carbon structural steel and low-alloy structural steel strips GB/T3524-1992 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Hot-rolled cardon and low alloy structural steel strips of carbon structural steel and low alloy structural steel strips 1 Main content and scope of application
GB/T3524.92
Replaces 3524-83
This standard specifies the dimensions, appearance, technical requirements, test methods and acceptance criteria of hot-rolled cardon and low alloy structural steel strips of carbon structural steel and low alloy structural steel.
This standard applies to hot-rolled cardon and low alloy structural steel strips of carbon structural steel with a thickness of 2.00~6.00tm and a width of 50~600mm 2 Reference standards
Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products GB222
Chemical analysis method of copper, iron and alloys
GB 223
GB 228
Metal tensile test method
GB 247
GB1591
Metal bending test method
General provisions for acceptance, packaging, marking and quality certificate of steel plates and steel strips
Technical conditions for low-alloy structural steels
GB2975
GB6397
3 Classification, code
Sampling provisions for mechanical and process performance tests of steel materials Metal tensile test specimens
3.1 Classification by steel strip shape
Strip steel strip
Coiled steel strip
3.2 Classification by steel strip edge state
Cut edge steel strip
Uncut edge steel strip
4 Dimensions, shape
4.1 The thickness and width of the steel strip shall comply with the provisions of Table 1. Table 1
Steel Strip Thickness
2. 00--6. 00
4.2The allowable deviation of steel strip thickness shall comply with the provisions of Table 2, approved by the State Bureau of Technical Supervision in 1992-1116
Steel Strip Width
Implementation on 1993-06-01
Steel Strip Thickness
>3. 00~5. 00
GB/T3524--92
4.3The allowable deviation of steel strip width shall comply with the provisions of Table 3. Table 3
Steel Strip Width
Uncut Edge
>200~300
Allowable Deviation
Allowable Deviation
4.4The thickness of the steel strip shall be uniform. The maximum difference (three-point difference) of the thickness measured at three points in the middle and both sides of the same section shall comply with the provisions of Table 4.
Steel strip width
>100~150Www.bzxZ.net
>150~200
>200~400
Three-point difference is not greater than
4.5 For steel strips used for cold rolling, the thickness in the rolling direction shall be uniform. The maximum difference (same strip difference) of the thickness measured at three points on the same straight line shall not be greater than 0.17mm.
Steel strips for rolling shall be indicated in the contract. 4.6 Length of steel strip
Strip steel strip:
For steel strips with a thickness of 2.00-4.00 mm, the length shall not be less than 6 m, and short-length steel strips with a length of not less than 4 m are allowed to be delivered; for steel strips with a thickness of 4.00-6.00 mm, the length shall not be less than 4 m, and short-length steel strips with a length of not less than 3 m are allowed to be delivered. The quantity of short-length steel strips shall not exceed 8% of the total weight of the batch. Coiled steel strip:
GB/T 3524-92
For steel strips rolled by continuous rolling mills, the length shall not be less than 50 m2, and steel strips with a length of 30-50 m2 are allowed to be delivered, and their weight shall not exceed 3% of the total weight of the batch.
The length of steel strips rolled by other rolling mills shall be agreed upon by the supply and demand parties. 4.7 The sickle of the steel strip shall not exceed 4 mm per meter. 4.8 Strip steel strips shall be delivered flat. According to the requirements of the purchaser, it can also be delivered in straight strips. 4.9 Marking example
The hot-rolled steel strip rolled with Q235-A, F steel, with a thickness of 3mm, a width of 150mm, and no trimming, is marked as: Hot-rolled steel strip Q235-A·F:3×150-BQ-JD-GR3524-925 Technical conditions
5.1 Steel grades and chemical composition
5.1-1 The steel strip is rolled with carbon structural steel Q215, Q235.Q255 A, B grades and Q175, Q275, and its chemical composition (melting analysis) shall comply with the provisions of GB700.
5.1.2 The steel strip is rolled with low alloy structural steel, and its chemical composition (melting analysis) shall comply with the provisions of GB1591 or corresponding standards. 5.2 Delivery status
Steel strips are delivered in the hot-rolled state
5.3 Mechanical properties
5.3.1 The tensile and cold bending tests of carbon structural steel strips shall comply with the provisions of Table 5. Table 5
Yield point 9
Not less than
Tensile strength
315-430
335~450
375~500
410~550
490--650
Note: The yield point of grade Q195 is for reference only and is not a delivery condition. 5.3.1.1 According to the requirements of the purchaser, the yield point of the steel strip may not be tested. Elongation
Not less than
180Cold bending test
α-specimen thickness
d-bending core diameter
r= 0. 5iar
5.3.1.2When the cold bending of grade A steel strip is qualified, the upper limit of tensile strength is not a delivery condition. The tensile strength of grade B steel can exceed the upper limit of 50 MPa specified in GB705.
5.3.2The mechanical properties of low alloy structural steel strip shall comply with the provisions of the corresponding standards. 5.4Surface quality
5.4.1There shall be no bubbles, scars, cracks, folds and cracks on the surface of the steel strip. There shall be no delamination of the steel strip. Other surface defects are allowed to exist-but the depth and height shall not exceed half of the thickness deviation, and slight red oxide scale is allowed to exist. 5.4.2Surface defects are allowed to be cleaned, but the minimum thickness and width of the steel strip shall be guaranteed after cleaning. The cleaned area shall be smooth and sharp. 5.4.3 For coiled steel strips with a length greater than 50 m, the abnormal position shall not exceed 8% of the total length of each coiled steel strip. 6 Test methods
CB/T3524
6.1 The inspection items, sampling quantity, sampling method and test method of each batch of steel strips shall comply with the provisions of Table 6. Table 6
Inspection items
Chemical composition
(Smelting analysis)
Surface quality
6.2 The dimensions of the steel strips shall be measured with common measuring tools. 6.3 The surface quality of the steel strips shall be inspected with the naked eye. Sample number base
(each furnace tank number)
by roll (strip)
by roll (strip)
6.4 Thickness, width and surface quality of steel strip The distance between the inspection point and the two ends of the steel strip: strip steel strip shall not be less than 250mm, coil steel strip shall not be less than 3000mm, 6.5 When measuring the thickness of steel strip, the distance between the measuring point and the side edge of the steel strip shall not be less than 10mm for uncut steel strip and not less than 5mm for cut steel strip. Sampling method
GB2975
GB2975
Testing method
GB 228,GB 6397,P 4
G13 232
6.6 When measuring the knife bend of steel strip, place the ruler close to the concave side of the steel strip and measure the maximum distance from the ruler to the side edge. 7 Acceptance rules
7.1 The steel strip shall be inspected and accepted by the supplier's technical supervision department. 7.2 The steel strip shall be accepted in batches. Each batch shall consist of steel strips of the same brand, furnace, number, size and category. The combined batches composed of different furnace numbers shall comply with the relevant standards. 7.3 The re-inspection of steel strip shall comply with the provisions of GB247. 8 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel strip shall comply with the relevant provisions of GB247. Additional notes:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard is under the jurisdiction of the Information and Standards Research Institute of the Ministry of Metallurgical Industry. This standard was drafted by Shanghai No. 10 Iron and Steel Plant, Capital Iron and Steel Company. The main drafters of the standard are Fang Zengde and Zhao Chunbao. The level grade mark of this standard is GB3524--92I
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