This standard specifies the dimensions, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking, quality certificate, etc. of high-quality carbon steel hot-rolled wire rod. This standard is applicable to the manufacture of carbon spring steel wire, oil quenched and tempered carbon spring steel wire, prestressed steel wire, high-strength high-quality carbon structural steel wire, galvanized steel wire, galvanized stranded wire and carbon steel hot-rolled wire rod for wire rope. In addition to the grade and chemical composition, this standard is also applicable to wire rod for alloy spring steel wire. GB/T 4354-1994 High-quality carbon steel hot-rolled wire rod GB/T4354-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
High-quality carbon steel hot-rolled wire rods
Iot-rolled quality carbon steel wire rods1 Subject content and scope of application
GB/T 4354--94
Replaces GB4354-84
This standard specifies the dimensions, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking, quality certificate, etc. of high-quality carbon hot-rolled wire rods. This standard is applicable to the manufacture of carbon spring steel wire, oil-fired and tempered carbon spring steel wire, prestressed wire, high-strength high-quality carbon structural steel wire, galvanized steel wire, galvanized stranded wire and wire rope. In addition to the grade and chemical composition, this standard is also applicable to wire rods for alloy spring steel wire.
2 Reference standards
Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products GI3 222
GB 223
GB 224
GB 228
GB 2101
GB2106
GB 2975
GB 6394
GB 6397
Methods for chemical analysis of iron, steel and alloys
Method for determination of the depth of decarburized layer in steel
Method for tensile testing of metals
Method for bending testing of metals
Method for upsetting testing of metals
Method for torsion testing of metal wires
Technical conditions for high-quality carbon structural steels
General provisions for acceptance, packaging, marking and quality certification of steel sectionsMethod for Charpy (V-notch) impact test of metalsMethod for determination of average grain size of metals by sampling for mechanical and technological properties tests of steels
Metal tensile test specimens
Method for microscopic evaluation of non-metallic inclusions in steelsGB 1056:
GB/T13298Methods for examination of metal microstructuresGB/I 14981 Hot rolled wire rod size, shape, weight and allowable deviation 3 Size, shape, weight and allowable deviation
The size, shape, weight and allowable deviation of wire rod shall comply with the provisions of GB/T11981. 4 Technical requirements
4.1 Grade and chemical composition
4.1.1 Wire rod shall be made of various grades of steel in GB699, and its chemical composition shall comply with the provisions of CB699 4.1.2 When sampling from steel or wire rod for chemical analysis, its allowable deviation shall comply with the provisions of GB222. Approved by the State Bureau of Technical Supervision on June 13, 1994, G4
Implementation on January 1, 1995
CB/T4354-94
4.1.3 Wire rods of other grades and chemical compositions can be supplied with agreement between the supplier and the screener and with indication in the contract. 4.2 Smelting method
Steel is smelted in open hearth, oxygen converter or electric furnace. 4.3 Delivery status
Wire rods are delivered in hot rolled state. Www.bzxZ.net
4.4 Decarburization layer
Wire rods with 60 (60 mm) steel or 60 (60 Mn) steel or above shall be inspected for the depth of decarburization layer. The total decarburization layer (the depth of the ferrite layer) on the edge of the wire rod is divided into three groups: one group is not more than 2%D, the second group is not more than 2.5%D, and the first group is not more than 3%D (D represents the nominal diameter of the wire rod).
If three groups of decarburization layers are required, it should be indicated in the contract. According to the requirements of the purchaser, wire rods with 30 (30 mm) steel or 30 (30 Mn) steel or above can be inspected for the depth of decarburization layer. Decarburization layer depth inspection is carried out, and the indicators are in accordance with the agreed regulations of the supplier and the supplier.
4.5 High-magnification organization
The wire rod shall not have flat structure (martensite and troostite area). If the supplier can guarantee the process, no inspection is required. 4.6 Surface quality
4.6.1 The harmful defects at the head and tail of the wire rod shall be removed, and the cross section shall not have shrinkage holes, delamination and impurities. 4.6.2 The surface of the wire rod shall be smooth, without cracks, folds, ears, scars, delamination and inclusions. Indentations and local bulges are allowed. The depth or height of the scratch surface (calculated from the actual size) of B and C precision shall not exceed 0.10mm, and the precision of other grades shall not exceed 0.20mm. 4.7 Special requirements
According to the requirements of the purchaser, after the agreement between the supply and demand parties, the mechanical properties, cold bending test, cold upsetting test, torsion test, actual grain size, austenite grain size, non-metallic inclusions, metallographic structure and other tests can be carried out. The indicators of each test shall be stipulated in the agreement between the supply and demand parties and shall be indicated in the contract.
5 Test methods
Each The inspection items, sampling methods and locations of batch wire rods. The inspection methods are as specified in the following table. Order
Inspection items
Chemical composition
Tensile test
Cold bending test
Upset test
Torsion test
Impact test
Grain size
Non-metallic inclusions
Metallographic structure
Maximum number of samples
1 per can
1 per batch
2-+/10 t
One/batch
3/batch
Joint sample method and position
Different root wire rods
GB2575
GB 2$75
Different root wire rods, two types
GR2975
Different root wire rods
Different root wire rods
Unbeneficial root wire rods
Different root wire rods
Test method
GB E28.GB 639?
G1321C5
GB 6394
GB/T 13298
Micrometer, Vernier Caliper
6 Inspection Rules
6.1 Inspection and Acceptance
GB/T4354—94
The quality inspection and acceptance of wire rods shall be carried out by the technical supervision department of the supplier. 6. 2 Batch Rules
Wire rods shall be inspected in batches, and each batch shall consist of the same furnace (tank) number, the same brand, and the same size. 6.3 Number of Joint Samples
The number of samples for wire rod quality inspection shall comply with the provisions of the above table. 6. 4 Re-inspection
The re-inspection and judgment rules of wire rods shall comply with the provisions of GB 2101. 7 Packaging, Marking and Quality Certificate
7. 1 Wire rods of group I weight shall be delivered in coils or bundles, and coils and bundles shall be bundled with no less than 2 layers, and wire rods of other group weights shall be bundled with no less than 3 layers.
7.2 Except as provided in this standard, other provisions shall be implemented in accordance with GB2101. Additional remarks:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China and drafted by Ma'anshan Iron and Steel Company, Shanghai No. 2 Steel Plant, Tianjin No. 5 Steel Plant, and Shougang Special Steel Company. The main drafters of this standard are Chen Lunkuan, Guo Xiaolin, Li Ping, and Hong Renxia. GR/T 4354—94 1
This standard is for horizontal grade standards
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