GB/T 18579-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| 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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GB/T 18579-2019: High-carbon Chromium Bearing Steel Wires---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT18579-2019
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).
This Standard was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee 183 on
Iron and Steel of Standardization Administration of China (SAC/TC 183).
The drafting organizations of this Standard. DONGBEI Special Steel Group Co., Ltd.;
Jiangyin XINGCHENG Special Steel Works Co., Ltd.; Luoyang Bearing Research
Institute Co., Ltd.; Shandong DONGE Steel Ball Group Co., Ltd.; Wuxi KAIMING Metal
Product Co., Ltd.; MCC Construction Research Institute Co., Ltd.; MCC Testing &
Certification Co., Ltd.; China Metallurgical Information and Standardization Institute.
The main drafters of this Standard. Kangge, Xie Yaping, Gong Chunlin, Baiyun, Lu
Changhe, Lei Jianzhong, Yangyong, Zhu Meijuan, Liudong, Mengyu, Zhang Jianfeng,
Wang Shanshan, Hanbing, Li Xiaobin, Wang Lingjun, Leng Mingjian, Wangyong.
The issuing of the previous versions of the standard replaced by this Standard is as
follows.
---GB/T 18579-2001.
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
3 Classification and Code
3.1 By metallurgical quality, steel can be divided into.
3.2 By casting process, steel can be divided into.
3.3 By product’s final purpose, steel can be divided into.
3.4 The classification and code of steel wires by the delivery state are shown in Table
1.When other delivery states are requested, this shall be indicated in the contract.
4 Order Content
Order content shall be indicated in the contract and shall include the following content.
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.
5.2 Appearances
5.2.1 Coil state
Each coil of steel wire shall be constituted of one steel wire. Coil shall be put in order.
When open a coil, steel wire shall not be scattered, twisted, tangled or knotted.
5.2.2 Straight state
5.2.3 Out-of-roundness
Out-of-roundness of steel wires shall be not more than a half of diameter tolerance of
steel wires.
5.3 Weights
5.3.1 The minimum internal diameter and minimum weight of each coil of steel wire
shall comply with the stipulations in Table 4.
5.3.2 Steel wire whose coil weight is less than the minimum coil weight, but not less
than 50 kg, is allowed. However, its weight shall not exceed 5% of the weight of that
batch.
6 Technical Requirements
6.1 Designation and Chemical Composition
6.1.1 The designations of steel are. GCr15 and G8Cr15.The chemical composition
(smelting analysis) shall comply with the stipulations in GB/T 18254-2016.
6.2 Smelting Method
Steel shall adopt vacuum degassing. Unless user’s consent has been obtained, the
manufacturer shall not intentionally add calcium and its alloy deoxidation, or, control
6.4 Low Magnification
The low magnification of steel wires used for rolling elements shall comply with the
stipulations in Table 5.The low magnification of steel wires used for rings shall comply
with the stipulations of high-quality steel and advanced high-quality steel in GB/T
18254-2016.
6.5 Mechanical Property
In terms of steel wires whose nominal diameter is not more than 10 mm, inspect tensile
strength. In terms of steel wires whose nominal diameter is more than 10 mm, inspect
Brinell hardness. The result shall comply with the stipulations in Table 6.
6.6 Microstructure
The microstructure of steel wires shall be fine, uniform and completely spheroidized
pearlite structure. Inspect in accordance with the 5th rating chart in Appendix A of GB/T
18254-2016; the qualification level is Level 2 ~ Level 4.
6.7 Carbide Heterogeneity
Delivery State Tensile Strength/MPa Brinell Hardness/HBW
6.12 Special Requirements
In accordance with the demand-side’s demands, through the negotiation between the
demand-side and the supply-side, and indication in the contract, the following special
requirements may be proposed.
7 Test Methods
7.1 Dimensions and Appearances
Each batch of steel wires shall receive appearance and dimensional inspection (if the
supply-side can guarantee that the dimensions of straight steel wires are qualified,
then, conduct spot check in accordance with a certain proportion) per coil (PCS).
7.2 Chemical Composition Analysis
7.2.1 Methods of chemical composition analysis shall comply with the general methods
in GB/T 223.5, GB/T 223.9, GB/T 223.11, GB/T 223.23, GB/T 223.26, GB/T 223.29,
GB/T 223.31, GB/T 223.47, GB/T 223.50, GB/T 223.53, GB/T 223.62, GB/T 223.63,
GB/T 223.77,
7.2.2 Oxygen content sample shall be inspected after thoroughly eliminating the
decarburization layer. The analysis method shall comply with GB/T 11261.
Nominal Diameter of Steel Wires (D) Single-sided Defect Depth, not more than
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.
7.4 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.
7.7 Determination
All the microscopic inspections are based on the most severe field of view or area on
the sample inspection surface.
8 Inspection Rules
8.1 Inspection and Acceptance Inspection
The quality of steel wires shall receive exit-factory inspection conducted by the supply-
side’s technical supervision department.
8.2 Group Rules
Steel wires shall receive inspection and acceptance inspection by batches. Each batch
shall be constituted of steel wires of the same smelting furnace number, the same
dimensions, the same heat treatment charge plan and the same delivery state.
8.3 Sampling Quantity and Sampling Part
The sampling quantity and sampling part of steel wires shall comply with the
stipulations in Table 9.
8.4 Re-inspection and Determination Rules
8.4.1 Among all the inspection items, when any inspection item is disqualified
(excluding non-metallic inclusion, carbide liquefaction and white dot), re-sampling and
re-inspection of the disqualified item are allowed.
8.4.2 When oxygen content is disqualified, on different PCS of finished products,
randomly take 3 samples to conduct re-inspection. The average value of the re-
inspection result shall be not more than the value stipulated by standard; 1 sample is
allowed to exceed the value stipulated by the standard, but it shall not exceed the
numerical value of the standard value after adding 0.0003%.
9 Packaging, Marking and Quality Certificate
The packaging, marking and quality certificate of steel wires shall comply with the
stipulations in GB/T 2103.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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