GB/T 4358-1995 Carbon spring steel wire for important purposes

This standard specifies the classification, size, shape, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of carbon spring steel wire for important purposes. This standard is applicable to the manufacture of springs that are not heat treated or only tempered at low temperature for important purposes such as high stress and valve springs. GB/T 4358-1995 Carbon spring steel wire for important purposes GB/T4358-1995 Standard download decompression password: www.bzxz.net

1 Scope
National Standard of the People's Republic of China
Carbon spring steel wire for far significant use
Carbon sprlng steel wire for far significant useGB/T4358—1995
Replaces GH4358-84
This standard specifies the classification, size, shape, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of carbon spring steel wire for far significant use.
This standard is not applicable to the manufacture of springs that are not heat treated or only tempered at low temperature for important purposes such as high stress and valve spring. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should discuss and use the possibility of the latest version of the following standards. GB222-84 Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products CB223.3-88 Chemical analysis methods for steel and alloys Diantipyryl methane phosphomolybdic acid gravimetric method for determination of phosphorus content GB 223.4--88
Gn 223.5-88
Chemical analysis methods for steel, titanium and alloys: Ammonium nitrate oxidation volumetric method for determination of manganese content Chemical analysis methods for steel and alloys Oxalic acid-ferrous sulfate silicon molybdenum blue photometric method for determination of silicon content GB 223.11--91
GB 223.12--91
GB 223.19-89
GB 223.23-82
GB 223. 53--87
Methods for Chemical Analysis of Iron and Steel and Alloys Ammonium Persulfate Oxidation Volumetric Method for Determination of Chromium Content Chemical Analysis Methods for Iron and Steel and Alloys
Sodium Carbonate Separation-Diphenylcarbazide Photometric Method for Determination of Chromium Content Chemical Analysis Methods for Iron and Steel and Alloys New Cuproline-Chloroform Extraction Photometric Method for Determination of Copper Content Chemical Analysis Methods for Iron and Steel and Alloys
Ni-Diacetyl Direct Photometric Method for Determination of Copper Content Mirror
Methods for Chemical Analysis of Iron and Steel and Alloys
Flame Atomic Absorption Spectrophotometric Method for Determination of Copper Content GB 223.54—87
Methods for Chemical Analysis of Iron and Steel and Alloys
GB 223. 58--$7
Methods for Chemical Analysis of Iron and Steel and Alloys
Methods for Chemical Analysis of Iron and Steel and Alloys
GR 223.5987
Flame atomic absorption spectrometry
Determination of manganese by sodium nitrite-sodium titrimetric method
Ladder phosphomolybdenum blue photometric method for determination of phosphorus
Methods for chemical analysis of iron, steel and alloy
GB 223.60—87
Methods for chemical analysis of iron, steel and alloy by gravimetric method with dehydrated peroxide
GB 223.61-—88
GB 223.62—88
Methods for chemical analysis of iron, steel and alloy
Determination of phosphorus by ammonium phosphomolybdate volumetric method
Methods for chemical analysis of iron, steel and alloy
Determination of phosphorus by butyl acetate benzene photometric method
GB223.63—88
Methods for chemical analysis of iron, steel and alloy
Sodium (potassium) periodate photometric method for determination of manganese GB 223. 64-88
Chemical analysis methods for steel, iron and alloys
Determination of manganese content by flame atomic absorption spectrometry
GB 223. 67-89
Chemical analysis methods for steel, iron and alloys Determination of sulfur content by reduction steam steel-methylene blue photometric method CB223.68·B9 Chemical analysis methods for steel, iron and alloys Combustion-potassium iodate volumetric method for determination of sulfur GB223.6991 Chemical analysis methods for steel, iron and alloys Combustion gas volumetric method for determination of carbon content GB/T223.71-91 Chemical analysis methods for steel, iron and alloys Combustion gravimetric method for determination of carbon content GB/T223.72-91 Chemical analysis methods for steel, iron and alloys Determination of sulfur content by alumina chromatography-sulfuric acid lock weight disk method GB224-87 Method for determination of decarburization depth of steel GB 228—87
Metal tensile test method
Approved by the State Bureau of Technical Supervision on October 10, 1995, 190
Implementation on March 1, 1996
CB/T 4358—1995
GB 239—87
Metal wire torsion test method
Dimensions, shape, weight and allowable deviations of cold-drawn round steel wireGB 342—82
GB 2103—88 General provisions for acceptance, packaging, marking and quality certificate of steel wireGR 2976—88±
Metal wire winding test method
3 Classification and code
Steel wires are divided into three groups according to their use: Group E, Group F and Group G. 4 Dimensions, shape and weight
4.1 Dimensions
4.1.1 Diameter range of steel wire
F group: 0.08~6.00 mm:
F group: 0.08~6.00 mm:
G group: 1.00~6.00 mm.
4.1.2 The diameter of steel wire shall comply with the provisions of Table 1 of GB312. According to the requirements of the purchaser, steel wires of different sizes can be supplied. 4.1.3 The allowable deviation of steel wire diameter: E group shall comply with the provisions of h10 grade in Table 3 of GB342; F group and G group shall comply with the provisions of h11 grade. Upon agreement between the supply and demand parties, E group can be supplied as h11 grade, and F group and G group can be supplied as hl grade. 4.2 Appearance
4.2.1 The out-of-roundness of the steel wire shall not be greater than half of the diameter tolerance. 4.2.2 The steel wire coil shall be neat and shall not be scattered, twisted or in a "co" shape when the steel wire coil is opened. 4.3 Weight
4.3.1 Each coil of steel wire shall consist of one steel wire, and no welded joints are allowed. 4.3.2
The minimum weight of each coil of steel wire shall comply with the requirements of Table 1. Table 1 Wire coil weight
Wire diameter, mm
0.10~0.20
>0. 20~0. 30
>0. 30~-0. 80
4.4 Marking example
Minimum coil weight, kg
Wire diameter, mm
2>0. 8~1. 80
>1.80~3. 00
>3. 00~-6. 00
Minimum coil weight, kg
4.4.1 Copper wire with mechanical properties of group E, diameter of 1.60 mm and diameter tolerance of h10 is an important carbon spring steel wire, which is marked as
1.60-h10-GB 342—82
Important purpose carbon tangled spring steel wire
E-GB/T435B—1995
4.4.2 When the purchaser requires the grade to be specified, the grade can be specified in the mark. For example, in the example of 4.4.1, when the purchaser requires 70 steel, the mark is!
1.60-h10-GB342—82
Important purpose carbon tangled spring steel wire
70-E-GB/T4358—1995
5 Technical requirements
5.1 Grade and chemical composition
5.1.1 Steel wire should be manufactured using the grades specified in Table 2. When the user does not specify the grade requirement, the steel wire manufacturer selects the grade. 191
0.62--0.69
0.57~-0.74
0. 85~~0. 03
C.83 ~0.89
0. 70~1. 00
0.30~0.60
C. 40~C.63
GB/T4358--1995
Chemical composition of steel
0. 17 ~C. 37
0. 17~~0. 37
.0. 35
On the premise of ensuring the mechanical properties of the wire, the Mn content of 65Mn and 71# steel can be adjusted to .90%~1.20% and 0.50%0.80% respectively.
5.1.3 Other grades of equivalent quality may be used for manufacturing upon agreement between the two parties. 5.1.4 The allowable deviation of chemical composition of finished steel wire and steel bar shall comply with the provisions of Table 2 in GB222. 5.2 Mechanical properties
The tensile strength of the steel wire shall be in accordance with the provisions of Table 3. The tensile strength of the intermediate size steel wire shall be in accordance with the provisions of the adjacent larger size. According to the requirements of the purchaser and indicated in the contract, the tensile strength of the intermediate size steel wire may also be in accordance with the provisions of the adjacent smaller size. Table 3 Mechanical properties
2330~-2710
2320~2700
2 310-~2 H(
2 30C -~2 680
2 29G~-2 670
2 280~-2 660
2 27U~ 650
2260-2610
2 240--2 620
2220~2600
2 220-~2 600
2 210--2 600
2210~-2590
221C~2500
2 200 ~ 2 580 | | tt | | 2 190--2 570 | | tt | Torsion
Tensile strength, MPa
2 710-~3 060
270C~-3050
2890~-3040
2 680~3 030
2 679~ 020
2 660- 3 010
2 650~-3 000
2 640~-2 090
2 620~2 970
2 600-2 950
2 60G ~-2 95C
2 600~2 950
2 5902 940
2 590--2 940
2580~-2935
2 570~2 920
2 5602 910
2550~2900
2 540--2 890
2 520~-2 87h
2 120~~2 500
2110~2490
2 060--2 390
2020~2350
1 H20~2 270
1870~2200
1830--2140
1 800~2 130
1760~2090
1 720-2 C00
1680--1960
1 630~-1 910
1 61C~1 B9n
1560~1840
1 520--1 750
1483~1710
1 410~1 640
1 380-1 610
1 330--1 550
1320~-155c
Tensile strength MPa
2500~-2850
2 490~2 B40
2 390-~2 690
2350-~2650
2 270--2 570
2200~2 500
2 160~~2 480
2 06C--2 36C
1970~-2230
187u2130
1 770-2 D:0
1 720--1 980
1 690~-1 950
1 670~~1030
1620-~: 84
1 570-~1 790
1500~1720
1 480~-1 700
1440~1 %60
1 420--1 560
1850~2110
1820~2 080
1780--2040
1 750-~2 010
1 700 ~1 960
1670--1915
1620~1560
1 520~1 860
[ 570~1 810
1 576-1 8t0
1 570-1 810
1470~-1710
1 47~~1 710
1170-~1710
1420~1660
1 400~-1 540
1350~159m
GB/T4358—1995
The steel wire shall be subjected to torsion test. The number of torsion shall comply with the provisions of Table 4. The torsion deformation shall be uniform, and there shall be no cracks or delamination on the surface, and the fracture shall be perpendicular to the axis.
Table 4 Number of torsion
>3.00--4.00bzxZ.net
24.04~5.00
>5.00~6.00
Not less than
Not less than
Not less than
5.3.2 Winding
The steel wire shall be subjected to winding test. For steel wires with a diameter less than 4mm, the diameter of the mandrel is equal to the diameter of the steel wire. For steel wires with a diameter greater than or equal to 4mm, the diameter of the winding mandrel is twice the diameter of the steel wire. After winding five turns, the steel wire shall not break or crack. This test can be omitted if the supplier can guarantee it.
5.3.3 Bending
According to the requirements of the purchaser, steel wires with a diameter greater than 1.00mm shall be subjected to bending test: the surface of the specimen after bending shall not crack or break.
5.4 Decarburization layer
5.4.1 Group G steel wires shall be subjected to decarburization layer test. The total decarburization layer depth shall not exceed 1.0% of the wire diameter. With the consent of the purchaser, steel wires with a decarburization layer not exceeding 1.5% of the diameter may be supplied. 5.4.2E, F steel wires shall be subjected to decarburization layer depth test only when the purchaser requires it. The decarburization layer depth shall be in accordance with the provisions of Group G. 5.5 Surface quality
5.5.1 The surface of the steel wire should be smooth, without cracks, folds, thorns, rust and other harmful defects, but individual small scratches and lubricating coatings with a depth not exceeding half of the diameter tolerance are allowed. The depth of surface scratches of Group G shall not exceed 0.02mm. When the diameter of the steel wire is not more than 2mm, the depth of the scratches shall not exceed 0.ol mm.
For steel wires for the aviation industry, the diameter is less than 3.5mm, and the depth of surface scratches shall not exceed 0.01mm. For those with a diameter greater than 3.5mm, the depth shall not exceed 0.02mm. This should be specified in the contract when ordering such steel wires. 5.5.2 According to the requirements of the purchaser, smooth steel wires without lubricating coatings can be supplied. 5.5.3 According to the requirements of the purchaser, hydrochloric acid corrosion inspection can be carried out for steel wires with a diameter greater than 1m. The surface of the steel wire after corrosion shall not have defects such as cracks and folds.
6 Test methods
6.1 The wire test items, test methods, sampling quantity and test requirements shall comply with the provisions of Table 5. 6.2 When conducting acid test on steel wire, place the sample in boiling 30% hydrochloric acid solution. Steady cover time: diameter not more than 2.6111 about 5min greater than 2.6mm for about 10 minutes, check the surface of the steel wire after immersion. 193
Test items
Chemical composition
Dimension measurement
Surface quality
Tensile test
Five-turn test
Bend test
Shrinkage test
Acid diffusion test
Inspection rules
Inspection and acceptance
Number of samples per batch
1 piece/batch
Invite to plate,
1 at each end of each plate
1 at each end of each plate
10% not less than 3 plates at one end
10% not less than 3 plates at one end
10% not less than 3 plates increase
10% not less than 3 plates one error
GB/T 4358—1995
Test method
Use a dry ruler
Visual inspection, if necessary, use a magnifying glass not more than 10 times to inspect
Both ends of the specimen are bent 80° in different directions
e≤4mmR-5mm
$4 mm,R=10 rnm
GB 2976
Observe with the naked eye, if necessary, use a magnifying glass not more than 10 times to inspect
The quality inspection and acceptance of steel wire shall be carried out by the technical quality supervision department of the supplier. 7.2 Batch rules
Test requirements
The depth of surface defects can be removed by sandpaper and sandpaper. After the test, the distance between the chucks is 100 times the diameter of the steel wire. When the torsion gauge is greater than or less than 100 times the diameter of the steel wire, the number of torsion times must be converted to the number of times when it is 100 times. However, when the diameter of the steel wire is less than 0.5mm, the distance between the chucks is 50mm. The copper wire should be inspected and accepted in batches. Each batch should consist of steel wires of the same brand, smelting furnace number, strength group and diameter. 7.3 Re-test||The re-test of steel wire should be carried out in accordance with GB2103.
Two tensile strength test specimens and two torsion test specimens, if one of the test specimens fails, the unqualified items can be retested. At this time, 1~3 turns should be removed from both ends of the wire coil and two more specimens should be taken for retesting. The results must comply with the provisions of this standard. 8 Packaging, marking and quality certificate
Wire packaging, marking and quality certificate shall comply with the provisions of GB2103. The packaging type shall comply with the requirements of Class II, and other types shall be indicated in the contract.
Test items
Chemical warfare analysis
Measurement
Surface quality
Tensile test
Torsion test
Bending test
Winding test
Acid diffusion test
7 Inspection rules
7.1 Inspection and acceptance
Number of samples for each batch
1 piece/batch
1 piece at both ends of the dish
1 piece at both ends of the dish
IC% not less than 3 at one end of the dish
10% not less than 3 at one end of the dish
10% not less than 3 at one end of the dish
1D% not less than 1 piece at one end of the dish
GB/T 4358—1995
Test method
Use micrometer
Test requirements
Visual inspection, if necessary, can be checked with sandpaper or emery cloth at a magnification of not more than 10. Surface defect depth can be checked with
times magnification
GB 228
Both ends of the specimen can be bent 90° in different directions
4 mm.R×3 mm
+>4 mm,R=10 mm
GB2976
Observe with naked eye, if necessary, can be checked with a microscope at a magnification of not more than 10
|The quality inspection and acceptance of steel wire shall be carried out by the technical quality supervision department of the supplier. 7.2 Batch rules
After grinding and removing the largest
chuck spacing or 10G times of the wire diameter,
when the torsion gauge length is greater than or less than
100 times the wire diameter, the torsion soft number must be converted to
the times when it is 100 times, but when the wire diameter is 0.5mm, the chuck spacing is
Steel wires should be inspected and accepted in batches. Each batch should consist of steel wires of the same brand, the same smelting furnace number, the same strength group and the same diameter.
7.3 Retest
The retest of steel wires should be carried out in accordance with GB 2103.
Two tensile strength specimens and two torsion test specimens, if one of the test results is unqualified, the unqualified item can be retested. At this time, 1 to 3 turns should be removed from both ends of the wire coil and then two specimens should be taken for retesting. The results must comply with the provisions of this standard. 8 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel wire shall comply with the provisions of GB2103. The packaging type shall comply with the requirements of Class I, and other types shall be indicated in the contract.3 Re-test
Re-test of steel wire shall be conducted in accordance with GB 2103.
Two specimens for tensile strength and two specimens for torsion test, if one of the specimens fails the test, the unqualified item can be re-tested. At this time, 1 to 3 turns should be removed from both ends of the steel wire coil and two specimens should be taken for re-testing. The results must comply with the provisions of this standard. 8 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel wire shall comply with the provisions of GB2103. The packaging type shall comply with the requirements of Class I, and other types shall be indicated in the contract.3 Re-test
Re-test of steel wire shall be conducted in accordance with GB 2103.
Two specimens for tensile strength and two specimens for torsion test, if one of the specimens fails the test, the unqualified item can be re-tested. At this time, 1 to 3 turns should be removed from both ends of the steel wire coil and two specimens should be taken for re-testing. The results must comply with the provisions of this standard. 8 Packaging, marking and quality certificate
The packaging, marking and quality certificate of steel wire shall comply with the provisions of GB2103. The packaging type shall comply with the requirements of Class I, and other types shall be indicated in the contract.
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