GB/T 18579-2019 PDF in English
GB/T 18579-2019 (GB/T18579-2019, GBT 18579-2019, GBT18579-2019)
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| GB/T 18579-2019 | English | 145 |
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High-carbon chromium bearing steel wires
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| GB/T 18579-2001 | English | 75 |
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High-carbon chromium bearing steel wires
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Standards related to (historical): GB/T 18579-2019
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GB/T 18579-2019: PDF in English (GBT 18579-2019) GB/T 18579-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.65
H 49
Replacing GB/T 18579-2001
High-carbon Chromium Bearing Steel Wires
ISSUED ON: DECEMBER 10, 2019
IMPLEMENTED ON: JULY 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Classification and Code ... 7
4 Order Content ... 7
5 Dimensions, Appearances, Weights and Allowable Deviations ... 8
6 Technical Requirements ... 10
7 Test Methods ... 13
8 Inspection Rules ... 15
9 Packaging, Marking and Quality Certificate ... 16
Foreword
This Standard was drafted in accordance with the rules in GB/T 1.1-2009.
This Standard serves as a replacement of GB/T 18579-2001 High-carbon Chromium
Bearing Steel Wires.
In comparison with GB/T 18579-2001, the main changes in technical content are as
follows:
---The classification of steel by metallurgical quality is added (see 3.1);
---Continuous cast steel is added (see 3.2);
---The classification of steel by product’s final purposes is added (see 3.3);
---The delivery state of “phosphating cold-drawn” is added; the delivery state of
polishing is deleted (see 3.4; 3.1 in Version 2001);
---The diameter range of steel wires is modified; the requirements of the allowable
deviation of diameter become more rigorous (see 5.1.1 and 5.1.2; 5.1.1 and
5.1.2 in Version 2001);
---The requirements of straightness are modified (see Table 3; Table 1 in Version
2001);
---The requirements of coil weight are modified (see 5.3; 5.3 in Version 2001);
---Designation G8Cr15 and relevant requirements are added (see 6.1.1);
---The requirements of low magnification of steel wires are modified (see 6.4; 6.4
in Version 2001);
---The requirements of steel wire fractures are deleted (see 6.4 in Version 2001);
---The requirements of mechanical property of cold-drawn and phosphating cold-
drawn steel wires are added (see 6.5);
---Quenching hardness test of sample is deleted (see 7.5 in Version 2001);
---The requirements of carbide band are added (see 6.7);
---The requirements of steel wire decarburization layer and surface quality are
modified (see 6.9 and 6.11; 6.6.5 and 6.7 in Version 2001);
---In re-inspection and determination rules, the stipulation that allows the
replacement of materials with billets and the replacement of large pieces with
small pieces is added (see 8.4.3).
High-carbon Chromium Bearing Steel Wires
1 Scope
This Standard stipulates the classification and code, order content, dimensions,
appearances, weights and allowable deviations, technical requirements, test methods,
inspection rules, packaging, marking and quality certificate of high-carbon chromium
bearing steel wires.
This Standard is applicable to high-carbon chromium bearing steel wires used in the
manufacturing of bearing rolling elements and rings (hereinafter referred to as steel
wires).
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 223.5 Steel and Iron - Determination of Acid-soluble Silicon and Total Silicon
Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9 Iron Steel and Alloy - Determination of Aluminum Content - Chrome Azurol
S Photometric Method
GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual
Titration or Potentiometric Titration Method
GB/T 223.23 Iron, Steel and Alloy - Determination of Nickel Content - The
Dimethylglyoxime Spectrophotometric Method
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The
Thiocyanate Spectrophotometric Method
GB/T 223.29 Iron, Steel and Alloy - Determination of Lead Content - Carrier
Precipitation-xylenol Orange Spectrophotometric Method
GB/T 223.31 Iron, Steel and Alloy - Determination of Arsenic Content - Distillation -
molybdenum Blue Spectrophotometric Method
GB/T 223.47 Method for Chemical Analysis of Iron, Steel and Alloy - The Carrier
Precipitation - Molybdenum Blue Photometric Method for the Determination of
Antimony Content
GB/T 223.50 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Phenylfluorone - CTMAB Direct Photometric Method for the Determination of Tin
Content
GB/T 223.53 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame
Atomic Absorption Spectrophotometric Method for the Determination of Copper
Content
GB/T 223.62 Methods for Chemical Analysis of Iron, Steel and Alloy - The Butyl Acetate
Extraction Photometric Method for the Determination of Phosphorus Content
GB/T 223.63 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium
(potassium) Periodate Photometric Method for the Determination of Manganese
Content
GB/T 223.77 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame
Atomic Absorption Spectrometric Method for the Determination of Calcium Content
GB/T 223.85 Steel and Iron - Determination of Sulfur Content - Infrared Absorption
Method after Combustion in an Induction Furnace
GB/T 223.86 Steel and Iron - Determination of Total Carbon Content - Infrared
Absorption Method after Combustion in an Induction Furnace
GB/T 224 Determination of the Depth of Decarburization of Steels
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room
Temperature
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method
GB/T 2103 General Requirements for Acceptance, Packing, Marking and Quality
Certification of Steel Wire
GB/T 4336 Carbon and Low-alloy Steel - Determination of Multi-element Contents -
Spark Discharge Atomic Emission Spectrometric Method (routine method)
GB/T 11261 Steel and Iron - Determination of Oxygen Content - The Pulse Heating
Inert Gas Fusion - Infrared Absorption Method
GB/T 18254-2016 High-carbon Chromium Bearing Steel
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the
Determination of Chemical Composition
GB/T 20123 Steel and Iron - Determination of Total Carbon and Sulfur Content -
Infrared Absorption Method after Combustion in an Induction Furnace (routine
method)
b) Designation;
c) Serial No. of this Standard;
d) Specification and appearance (when being delivered in straight state as
requested, this shall be indicated in the contract);
e) Weight and/or quantity;
f) Casting method (when it is not indicated, comply with continuous cast);
g) Delivery state;
h) Product’s final purposes;
i) Others.
5 Dimensions, Appearances, Weights and Allowable
Deviations
5.1 Dimensions
5.1.1 The nominal diameter range of steel wires is 1.00 mm ~ 20.00 mm.
5.1.2 The allowable deviations of diameter of steel wires shall comply with the
stipulations in Table 2. The allowable deviations of diameter of steel wires shall be
indicated in the contract; when it is not indicated, products shall be provided in
accordance with Level-10. In accordance with the demand-side’s demands, and
through negotiation between both sides, steel wires of other specifications and
allowable deviations may also be provided.
7.2.3 Titanium content analysis method shall be determined by the demand-side and
the supply-side through negotiation.
7.3 Mechanical Property
7.3.1 Tensile strength test: from both ends (in terms of straight steel wire: from any end)
of steel wire coil, take a sample whose length is not less than 250 mm; test the tensile
strength. Test method shall comply with the stipulations in GB/T 228.1.
7.3.2 Brinell hardness test: from both ends (in terms of straight steel wire: from any
end) of steel wire coil, take a sample. Test method shall comply with the stipulations in
GB/T 231.1.
7.4 Low Magnification
On different coils (PCS) of steel wire, randomly take 6 samples. In accordance with the
stipulations in 7.5 in GB/T 18254-2016, test the low magnification.
7.5 Surface Quality
7.5.1 From both ends of each coil of steel wire, respectively take a sample whose
length is not less than 250 mm, under acid pickling, inspect the surface quality of the
steel wire (firstly, remove one end whose length is not less than 500 mm, then, take a
sample, under acid pickling, inspect the surface quality). After sulfuric acid or
hydrochloric acid pickling, inspect the sample.
7.5.2 The surface quality of steel wires shall be inspected through visual inspection or
other effective methods.
7.6 Other Items
The test methods of other items of steel wires shall comply with the stipulations in Table
9.
Table 9 -- Inspection Items, Sampling Parts and Quantity, Test Methods
No. Inspection Items Sampling Quantity Sampling Parts
Clause of
Requirements Test Methods
1 Dimensions Per coil (PCS)
Not less than 3
parts per coil
(PCS)
5.1, 5.2 7.1
2 Chemical Composition 1 PCS per furnace GB/T 20066 6.1 7.2.1
3 Oxygen Content 1 PCS per furnace
8.3.2 in GB/T
18254-2016 6.1 7.2.2
4 Low Magnification 6 PCS 7.4 6.4
7.5 in GB/T
18254-2016
5 Tensile Test When the number of coils Both ends per 6.5 7.3.1
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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