This standard specifies the technical conditions for hot-rolled thick steel plates and strips of carbon structural steel and low alloy structural steel. This standard applies to hot-rolled thick steel plates of ordinary carbon structural steel and low alloy structural steel with a thickness greater than 4~200 mm and hot-rolled steel strips with a thickness greater than 4~25 mm. GB/T 3274-1988 Hot-rolled thick steel plates and strips of ordinary carbon structural steel and low alloy structural steel GB/T3274-1988 Standard download decompression password: www.bzxz.net

UDC 699. 14. 018.29 : 669. 15. 194. 2H46
National Standard of the People's Republic of China
GB3274—88
Carbon structural steel and low alloy structural steel
Hot rolled thick steel plates and strips
Carbon structural and low alloysteel rolled plates and stripsIssued on 1988-06-29
Implemented on 1989-07-01
Issued by the State Bureau of Standards
National Standard of the People's Republic of China
Carbon structural steel and low alloysteel rolled thick steel plates and strips
Carbon structural and low alloysteel rolled plates and stripsSubject Content and Scope of Application
This standard specifies the technical conditions for hot rolled thick steel plates and strips of carbon structural steel and low alloy steel. UDC 669. 14. 018
29 1 669. 15
GB 327488
Replaces GB 327±—82
This standard is applicable to hot-rolled thick steel plates of ordinary carbon slurry structural steel and low alloy structural steel with a thickness greater than 4~20Dmm and hot-rolled steel strips with a thickness greater than 4~25mm.
2 Reference standards
GB 222
GB 228
GD 700
GB 709
GB1591
GB 2106
GB 2975
Methods for sampling samples for chemical analysis of steel and allowable deviations for chemical composition of finished products Chemical analysis methods for steel and alloys
Methods for tensile testing of metals
Methods for bending testing of metals
General provisions for acceptance, packaging, marking and quality certification of steel plates and strips Carbon structural steel
Dimensions, shapes, weights and allowable deviations of hot-rolled steel plates and strips Low alloy structural steel
Methods for Charpy (V-notch) impact testing of metals Sampling provisions for mechanical and process performance tests of steel materials GB 4159
GB6397
Jinzhan Low Temperature Charpy Impact Test Method
Metal Tensile Test Specimen
3 Dimensions, Shape, Weight and Permissible Deviation
The dimensions, shape, weight and permissible deviation of steel plates and strips shall comply with the provisions of G709. 4 Technical Requirements
4.1 Grade and Chemical Composition
The grade and chemical composition of steel shall comply with the provisions of GB700 and GB1591. 4.2 Delivery Status
4.2.1 Steel plates and strips shall be delivered in hot-rolled or heat-treated state. 4.2.2 Steel plates shall be delivered with four sides cut. When limited by equipment capacity, flame cutting may be used. 4.2.3 Steel strips and steel plates cut from steel strips may be delivered without cutting longitudinal edges. 4.3 Mechanical properties
Approved by the Ministry of Metallurgical Industry of the People's Republic of China on June 11, 1988 and implemented on July 1, 1989
GB 3274—8.8
The mechanical properties of hot-rolled steel plates and strips shall conform to the provisions of GB700 and GB1591. 4.4 Surface quality
4. 4:7 There shall be no bubbles, scars, rips, cracks, folds, inclusions or pressed iron oxide scale on the surface of steel plates and strips. Steel plates and steel strips shall not be delaminated.
4.4.2. The surface of steel plates and steel strips is allowed to have a thin layer of iron oxide scale and rust that does not hinder the inspection of surface defects, insignificant roughness and scratches caused by the shedding of pressed iron oxide scale, mesh patterns caused by rolling and other local defects, but the convexity of the scratches shall not exceed half of the thickness tolerance of the steel plates and steel strips. For low-alloy steel plates and steel strips, it shall be ensured that the thickness does not exceed the minimum allowable thickness. 4.4.3 Defects on the surface of steel plates are not allowed to be welded or blocked. They should be cleaned with a chisel or grinding wheel. The cleaned area should be smooth and without edges and corners. The cleaning depth shall not exceed the range of the negative deviation of the pot plate thickness. For low-alloy pot plates, it shall be ensured that the thickness does not exceed the minimum allowable thickness of the steel plate. 4.4.4 Coiled steel strips are allowed to be delivered with defects, but the surface defects and abnormal quality shall not exceed 10% of the total length of each coiled steel strip. 4. 4. 5 The edges of trimmed steel plates and steel strips shall not have sawtooth-shaped bumps, but individual hairlines with a depth of no more than 2 mm and a length of no more than 25 mm are allowed.
For untrimmed steel plates and strips, the edge cracks and other defects caused by rolling shall not exceed half of the width deviation of the steel plates and steel strips in the horizontal depth, and the steel plates shall not be less than the nominal width. 4.4.6 According to the agreement between the supply and demand parties, steel plates with a thickness greater than 10 mm can be ultrasonically inspected one by one, and the inspection method shall be determined by negotiation between the two parties.
5 Test methods
5.1 The inspection items, sampling quantity, sampling method and test method of each batch of steel plates shall comply with the provisions of the following table.
Inspection items
Chemical analysis
Strip temperature shock
Low temperature shock
5.2 The surface quality of steel plates and strips shall be inspected with naked eyes. 6 Inspection rules
Sampling quantity
(per furnace number)
Sampling method
GB2975
Test methods
GB6397
GB2106
GB4159
6.1 Steel plates and strips shall be inspected in batches. Each batch shall consist of steel plates and strips with the same furnace number and the same heat treatment system (referring to those that have been heat treated). The weight shall not exceed 60 tons. For the same batch of steel plates with a thickness not exceeding 10 mm, the thickness difference shall not exceed 2 mm; for those with a thickness exceeding 10 mm, the thickness difference shall not exceed 3 mm.
6.2 Mixed batches composed of steel smelted in a steelmaking furnace with a nominal capacity not exceeding 301 or steel plates and strips made by continuous casting and rolling shall comply with the provisions of GB700 and GB1591.
6.3 The re-inspection and other acceptance rules of steel plates and strips shall comply with the provisions of GB247, GB700 and GB1591. 7 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel plates and strips shall comply with the relevant provisions of GB247. 2
Additional remarks: www.bzxz.net
GB 3274—88
This standard was proposed by the Information and Standards Research Institute of the Ministry of Metallurgical Industry. This standard was drafted by Anshan Bingtie Company. The main drafter of this standard is Wang Huifan
Level marking of this standard
GB 3274—88 I
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.