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GB/T 699-2015 PDF English

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GB/T 699-2015: Quality carbon structure steels
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GB/T 699: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 699-2015English85 Add to Cart 0-9 seconds. Auto-delivery Quality carbon structure steels Valid
GB/T 699-1999English70 Add to Cart 0-9 seconds. Auto-delivery [Replaced by GB/T 699-2015] Quality carbon structural steels Obsolete
GB/T 699-1988EnglishRFQ ASK 3 days Quality carbon structure steel--Technical requirements Obsolete

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GB/T 699-2015: Quality carbon structure steels

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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.45 H 40 Replacing GB/T 699-1999 Quality carbon structure steels Issued on: DECEMBER 10, 2015 Implemented on: NOVEMBER 1, 2016 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration Committee.

Table of Contents

Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Classifications and Code... 8 4 Order Information... 8 5 Size, Appearance and Weight... 9 6 Technical Requirements... 9 7 Test Methods... 15 8 Inspection Rules... 16 9 Packaging, Marks and Quality Certificate... 17

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 699-1999 Quality Carbon Structural Steels. Compared with GB/T 699-1999, the main technical changes are as follows. - Deleted steel bar classification according to metallurgical quality; added classification according to surface type (see Clause 3 of this Standard; Clause 4, Table 2 & Table 4 in GB/T 699-1999); - Deleted rimmed steel and semi-killed steel (see Table 1 of this Standard; Sub-clause 6.1.1.6 and 6.1.1.8 in GB/T 699-1999); - Modified chemical composition of the Steel 08Al (see footnote c in Table 1 of this Standard; Sub-clause 6.1.1.5 in GB/T 699-1999); - Specified “yield point” as “lower yield strength Rel or specific plastic extension strength Rp0.2” (see Table 2 of this Standard; Table 3 in GB/T 699-1999); - Increased allowable adjustment range of heat treatment temperature (see footnote c in Table 2 of this Standard); - Modified sampling provisions on steel bar mechanical properties change wrought (rolled) (see setting in Table 2 of this Standard; Sub-clause 6.4.2 in GB/T 699-1999); - Specified requirements for forging steel (see Sub-clause 6.5.1 of this Standard; Sub-clause 6.5.1 in GB/T 699-1999); - Increased macrostructure requirements for continuously cast steel (see Table 3 of this Standard); - Subdivided surface imperfection into imperfection and defect (see Sub- clause 6.6.1 and 6.8 of this Standard; Sub-clause 6.6.1 and 6.9 in GB/T 699-1999); - Added that surface quality shall comply with provisions of GB/T 28300 (see Sub-clause 6.8.4 of this Standard). - Modified sampling number of impact test, microstructure inspection, etc. (see Table 7 of this Standard); - Added requirements that steel bar test results use numerical rounding rules (see Sub-clause 8.4.3 of this Standard). This Standard was proposed by China Iron and Steel Association. This Standard shall be under the jurisdiction of the Technical Committee on Steel of Standardization Committee of China (SAC/TC 183). The main drafting organizations of this Standard. Information Standard Institute of the Ministry of Metallurgical Industry, Shijiazhuang Iron and Steel Co., Ltd., Fujian Province Sanming Steel (Group) Co., Ltd., Tianjin Iron and Steel Group Co., Ltd., Daye Special Steel Co., Ltd., Shougang Group, Qingdao Iron and Steel Co., Ltd. Main drafters of this Standard. Luan Yan, Dai Qiang, Meng Ruiying, Liu Jianfeng, Liu Guihua, Sun Zhicheng, Gong Cui, Hu Haiping, Liu Junhui, Yan Chengming, Deng Zhiyong. This Standard replaces the following previous standards. - GB 699-1965, GB 699-1988, GB/T 699-1999. Quality Carbon Structural Steels

1 Scope

This Standard specifies classification and code, order information, size, appearance and weight, technical requirements, test methods, inspection rules, packaging, marks and quality certificate of quality carbon structural steel bars. This Standard is applicable to hot-rolled or forged quality carbon structural steel bars of which nominal diameter or thickness is not greater than 250 mm. Hot- rolled or forged quality carbon structural steel bars of which nominal diameter or thickness is greater than 250 mm shall also be supplied, as agreed between the buyer and the supplier (hereinafter referred to as steel bars) The designations and chemical composition specified in this Standard are also applicable to steel ingots, steel billets, steels and its products of other cross- sections.

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 223.19 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 notch impact test GB/T 231.1 Metallic materials - Brinell hardness test - Part 1.Test method GB/T 702 Hot-rolled steel bars - Dimensions, shape, weight and tolerances GB/T 908 Forged round and square steels 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 Examination 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 examination GB/T 7736 Ultrasonic Inspecting Method for Macro-structure and Imperfection of Steel Method for the test of mean grain fineness of metals GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 10561 Steel - Determination of content of non-metallic inclusion- Micrographic method using standard 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 GB/T 13299 Steel - Determination of microstructure GB/T 15711 Steel Products - Method for Etch Test of Tower Sample GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements 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) GB/T 20124 Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas (Routine method) GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method GB/T 21834 Medium and low alloy steel - Determination of the distribution of multi-element contents - Original position statistic distribution analysis method GB/T 28300 Surface quality classes for hot-rolled bars and rods technical delivery conditions YB/T 4306 Steel iron and alloy - Determination of nitrogen content in steel and alloy inert gas fusion thermal conductivity method YB/T 5293 Metallic materials - Forging test

3 Classifications and Code

3.1 Steel bar is classified into two categories according to the processing method used. a) Steel for pressed work UP 1) Steel for hot pressed work UHP 2) Steel for upsetting work UF 3) Steel for cold drawn billet UCD b) Steel for cutting work UC 3.2 Steel bar is classified into five categories according to the type of surface. a) Pressure processing surface SPP b) Pickling surface SA c) Shot blasting surface SS d) Stripping surface SF e) Polishing surface SP

4 Order Information

The contracts or purchase orders ordered according to this Standard shall contain the following contents. a) Standard code number; b) Name of product; c) Designations or unified numerical code; d) Weight (quantity) of delivery; e) Dimension, appearance and allowance (see Clause 5); f) The processing method to be used (see cutting steel if not indicated); g) Heat treatment delivery or special surface state delivery (see 6.3.2 and 6.3.3 if required);

5 Size, Appearance and Weight

5.1 The size, appearance, weight and allowance of hot-rolled steel bars shall comply with relevant provisions in GB/T 702.Specific requirements shall be clearly stated in the contract.

6 Technical Requirements

6.1 Designations and Chemical Composition 6.1.1 Designations, unified numerical code and chemical composition (smelting analysis) of steels shall comply with Table 1. 6.1.2 The nitrogen content of steels smelted in oxygen-blown converters shall not be higher than 0.008%. If the supplier can guarantee the conformance, the analysis may be exempted. 6.1.3 The manganese content of 35~85 steels for lead-bath quenched steel wires shall be 0.30%~0.60%; the manganese content of 65 Mn and 70 Mn shall be 0.70%~1.00%; the chromium content shall not be higher than 0.10%, the nickel content shall not be higher than 0.15%, the copper content shall not be higher than 0.20%; the sulfur and phosphorus contents shall comply with the requirements of steel wire standards, but shall not be higher than the indexes in Table 1. 6.1.4 The allowance for chemical composition of steel bars (or billets) shall comply with the provisions in GB/T 222. 6.2 Smelting Method Unless otherwise specified in the contract, the smelting method shall be chosen by the manufacturer. 6.3 State of Delivery 6.3.1 Steel bars are normally delivered in the hot-rolled or hot-forged state. 6.3.2 It may also be delivered in the heat treated (annealed, normalized or high temperature tempered) based on buyer’s requirements and it shall be stated in the contract. 6.3.3 It may also be delivered with special surface sate (pickling, shot blasting, stripping, polishing) based on buyer’s requirements and it shall be stated in the contract. 6.4 Mechanical Properties 6.4.1 For test sample made of heat-treated (normalized) billet, the longitudinal tensile properties of steel bar shall comply with the provisions in Table 2.If the supplier can guarantee the conformance of tensile properties, the tests may be exempted.

7 Test Methods

Test items and test methods of steel bar are shown in Table 7.

8 Inspection Rules

8.1 Inspections and Acceptance 8.1.1 Factory inspection and acceptance shall be carried out by the quality technical supervision department of the supplier. 8.1.2 The supplier must ensure that the steel bar delivered complies with the provisions of this Standard or of the contract. The buyer is entitled to make inspection or acceptance to any of the test items defined in this Standard or the contract if necessary. 8.2 Batch-group Rules Steel bar shall be inspected and accepted according to batch. Each batch consists of steel material with the same designation, the same furnace number, the same working method, the same size, the same delivery state, the same heat treatment system (or furnace lot). 8.3 Quantity and Location for Sampling The quantity and location for sampling of each batch of steel bar shall comply with the provisions in Table 7. 8.4 Re-inspection and Judging Rules 8.4.1 The re-inspection and judging rules shall be in compliance with provisions in standard GB/T 17505. 8.4.2 If the supplier can guarantee the conformance of the steel material, it is allowed to use billet to substitute material, or to use large pieces to substitute small pieces - for the same furnace (tank) steel-material or steel-billet’s macro- test, mechanical properties and non-metallic inclusion’s inspection result.

9 Packaging, Marks and Quality Certificate

Packaging, marks and quality certificates of the steel bar shall comply with the provisions of GB/T 2101. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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