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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 18983-2003 Oil-hardened and Tempered Wire for Mechanical Springs in whole. The following changes have been made with respect to GB/T 18983-2003 (the previous edition):
——"GB/T 4336, GB/T 13298, GB/T 20123 and GB/T 20125" are added in Normative References;
——Grade "ultra-high tensile strength" is added in classification and designation;
——Diameter range is modified;
——New compositions of TDSiCr-B, TDSiCr-C and VDSiCrV are added in chemical composition;
——"Permissible maximum depth of surface decarburization" is modified;
——Mechanical property indexes of TDSiCr-B and TDSiCr-C are added in "mechanical properties of static and medium fatigue of wires";
Mechanical property index of VDSiCrV is added in "mechanical property of high fatigue of wire";
——"Permissible maximum depth of surface defect" is modified and description about acid leaching test method is added.
This part has been redrafted and modified adoption of ISO 8458-3: 2002 Steel Wire for Mechanical Springs - Part 3: Oil-hardened and Tempered Wire, which is not equivalent to ISO 8458-3: 2002 in consistency.
This standard was proposed by China Iron and Steel Industry Association.
This standard is under the jurisdiction of National Technical Committee on Iron and Steel of Standardization Administration of China (SAT/TC 183).
The previous edition of this standard is as follows:
——GB/T 18983-2003.
Wire for Quenched and Tempered Springs
1 Scope
This standard specifies the classification and designation, order details, diameter, shape and permissible deviation, manufacturing method, technical requirements, test methods and inspection rules, packaging, marking and quality certificate of wire for quenched and tempered spring (hereinafter referred to as wire).
This standard is applicable to the manufacture of various quenched and tempered carbon and low alloy wires with circular cross sections, which are used for various mechanical springs.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 222 Method of Sampling Steel for Determination of Chemical Composition and Permissible Variations for Product Analysis
GB/T 223.5 Steel and Iron - Determination of Acid-soluble Silicon and Total Silicon Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.11 Iron Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method
GB/T 223.13 Methods for Chemical Analysis of Iron, Steel and Alloy - the Ammonium Ferrous Sulfate Titration Method for the Determination of Vanadium Content
GB/T 223.19 Methods for Chemical Analysis of Iron Steel and Alloy; the Neocuproine-chloroform Extraction Photometric Method for the Determination of Copper Content
GB/T 223.58 Methods for Chemical Analysis of Iron, Steel and Alloy; the Sodium Arsenite-sodium Nitrite Titrimetric Method for the Determination of Manganese Content
GB/T 223.59 Iron Steel and Alloy - Determination of Phosphorus Content - Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony Phosphomolybdate Blue Spectrophotometric Method
GB/T 223.60 Methods for Chemical Analysis of Iron, Steel And Alloy the Perchloric Acid Dehydration Gravimetric Method for the Determination of Silicon Content
GB/T 223.68 Methods for Chemical Analysis of Iron, Steel and Alloy the Potassium Iodate Titration Method after Combustion in the Pipe Furnace for the Determination of Sulfur Content
GB/T 223.69 Iron Steel and Alloy - Determination of Carbon Contents - Gas-volumetric Method after Combustion in the Pipe Furnace
GB/T 224 Determination of Depth of Decarburization of Steel
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1 : Method of Test at Room Temperature
GB/T 232 Metallic Materials - Bend Test
GB/T 239.1 Metallic Materials - Wire - Part 1: Simple Torsion Test
GB/T 239.2 Metallic Materials - Wire - Part 2: Reverse Torsion Test
GB/T 2103 General Requirements for Acceptance，Packing，Marking and Quality Certification of Steel Wire
GB/T 2976 Metallic Materials – Wire-wrapping Test
GB/T 4336 Carbon And Low-alloy Steel - Determination of Multi-element Contents - Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 10561 Steel-Determination of Content of Non-metallic Inclusion - Micrographic Method Using Standard Diagrams
GB/T 13298 Inspection Methods of Microstructure For Metals
GB/T 20123 Steel And Iron - Determination of Total Carbon and Sulfur Content Infrared Absorption Method after Combustion in an Induction Furnace (Routine Method)
GB/T 20125 Low-alloy Steel - Determination of Multi-element Contents - Inductively Coupled Plasma Atomic Emission Spectrometric Method
3 Classification and Designation
3.1 Classification
3.1.1 According to the working condition, wire is classified into the static, medium fatigue and high fatigue types.
3.1.2 According to the supply tensile strength, wire is classified into the low tensile strength, medium tensile strength and high tensile strength.
3.2 Designation
See Table 1 for the classification, designation and diameter range of wire.
3.3 Marking example
VDSiCr grade of wire with diameter of 3.0mm should be marked as:
VDSiCr-3.0-GB/T 18983.
Table 1 Classification, Designation and Diameter Range of Wire
Classification Static Medium fatigue a High fatigue
Tensile strength Low tensile strength FDC TDC VDC
Medium tensile strength FDCrV and FDSiMn TDSiMn VDCrV
High tensile strength FDSiCr TDSiCr-A VDSiCr
Ultra-high tensile strength — TDSiCr-B and TDSiCr-C VDSiCrV
Diameter range 0.50~18.00mm 0.50~18.00mma 0.50~10.00mm
Notes:
1: FD grade is intended for static applications, required for normal springs.
2: TD grade is intended for medium fatigue levels, required for clutch spring with normal strength and suspension spring.
3: VD grade is intended for high fatigue use under severe dynamic duty such as for valve springs.
a Diameter range of TDSiCr-B and TDSiCr-C is 8.0~18.0mm.
4 Order Contents
The contract or order according to this standard shall cover the following contents:
a) No. of this standard;
b) Product name;
c) Grade;
d) Specification and quantity of product;
e) Delivery form and single-piece weight;
f) Wire for valve shall be marked with non-metallic inclusion grade;
g) Special requirements.
5 Diameter, Shape and Permissible Deviation
5.1 Diameter
5.1.1 The diameter and permissible deviation of wire shall meet the requirements of Table 2. Where the purchaser has special requirements for the diameter deviation, they shall be noted in the contract.
5.1.2 The out-of-roundness of wire shall not be greater than half of the tolerance of nominal diameter.
5.2 Shape
The shape of wire shall be regular and be free from any bend which may affect its application.
Foreword i
1 Scope
2 Normative References
3 Classification and Designation
4 Order Contents
5 Diameter, Shape and Permissible Deviation
6 Manufacturing Method
7 Technical Requirements
8 Test Methods
9 Inspection Rules
10 Packaging, Marking and Quality Certificate
Annex A (Informative) Corresponding Relationship of Designation and Steel Grade
