GB/T 699-2015 in English

《GB/T 699-2015优质碳素结构钢》由TC183（全国钢标准化技术委员会）归口，TC183SC16（全国钢标准化技术委员会特殊钢分会）执行，主管部门为中国钢铁工业协会。
本标准规定了优质碳素结构钢棒材的分类与代号，订货内容，尺寸、外形及重量，技术要求，试验方法，检验规则，包装、标志和质量证明书。
本标准适用于公称直径或厚度不大于250 mm热轧和锻制优质碳素结构钢棒材。经供需双方协商，也可供应公称直径或厚度大于250 mm热轧和锻制优质碳素结构钢棒材。
本标准所规定牌号及化学成分也适用于钢锭、钢坯、其他截面的钢材及其制品。

1 Scope

This standard specifies classification and code, order contents, size, shape and weight, technical requirements, test methods, inspection rules as well as packaging, marking and quality certificate of quality carbon structure steel bars.
This standard is applicable to the hot-rolled and forged quality carbon structure steel bars with nominal diameter or thickness not greater than 250mm. The hot-rolled and forged quality carbon structure steel bars with the nominal diameter or thickness greater than 250mm may also be provided basing on the agreement of both the Supplier and the Purchaser.
The grade and chemical composition specified in this standard are also applicable to steel ingot, steel billet, steel products with other sections and their products.

2 Normative References

The following referenced documents are indispensable for the application of this document. For dated references, only dated editions apply. For undated references, the lastest editions (including any amendments) apply.
GB/T 222 Permissible Deviations for Chemical Composition of Steel Products
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 223.19 Methods for Chemical Analysis of Iron Steel and Alloy - The Neocuproine-chloroform Extraction Photometric Method for the Determination of Copper Content
GB/T 223.23 Iron Steel and Alloy - Determination of Nickel Content - The Dimethylglyoxime Spectrophotometric Method
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 223.63 Methods for Chemical Analysis of Iron Steel and Alloy - The Sodium (Potassium) Periodate Photometric Method for the Determination of Manganese Content
GB/T 223.79 Iron and Steel - Determination of Multi-element Contents - X-ray Fluorescence Spectrometry (Routine Method)
GB/T 223.81 Iron Steel and Alloy - Determination of Total Aluminum and Total Boron Contents - Microwave Digestion-Inductively Coupled Plasma Mass Spectrometric Method
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 Depth of Decarburization of Steel
GB/T 225 Steel - Hardenability Test by End Quenching (Jominy Test)
GB/T 226 Etch Test for Macrostructure and Defect of Steels
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method
GB/T 702 Hot-Rolled Round and Square Steel Bars - Dimension, Shape, Weight and Tolerance
GB/T 908 Forged Bars - Dimension, Shape, Weight and Tolerance
GB/T 1979 Standard Diagrams for Macrostructure and Defect of Structural Steels
GB/T 2101 General Requirement of Acceptance Packaging, Marking and Certification for Section Steel
GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing
GB/T 4162 Forged and Rolled Steel Bars - Method for Ultrasonic Testing
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission Spectrometric Analysis of Carbon and Low-alloy Steel (Routine Method)
GB/T 6394 Metal - Methods for Estimating the Average Grain Size
GB/T 6402 Steel Forgings - Method for Ultrasonic Testing
GB/T 7736 Ultrasonic Inspecting Method for Macro-structure and Imperfection of Steel
GB/T 8170-2008 Rules of Rounding Off for Numerical Values & Expression and Judgment of Limiting Values
GB/T 10561 Steel - Determination of Content of Nonmetallic Inclusions - Micrographic Method using Standards Diagrams
GB/T 11261 Steel and Iron - Determination of Oxygen Content - The Pulse Heating Inert Gas Fusion-Infra-red Absorption Method
GB/T 13298 Metal - Inspection Method of Microstructure

Foreword I
1 Scope
2 Normative References
3 Classification and Code
4 Order Contents
5 Size, Shape and Weight
6 Technical Requirements
7 Test Methods
8 Inspection Rules
9 Packaging, Marking and Quality Certificate