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GB/T 699-2015 PDF English (GB/T 699-1999: Older version)Search result: GB/T 699-2015 (GB/T 699-1999 Older version)
GB/T699-2015 (GBT699-2015): PDF in EnglishGB/T 699-2015 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). 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 12 U20602 60 0.57~0.65 0.17~0.37 0.50~0.80 0.035 0.035 0.25 0.30 0.25 13 U20652 65 0.62~0.70 0.17~0.37 0.50~0.80 0.035 0.035 0.25 0.30 0.25 14 U20702 70 0.67~0.75 0.17~0.37 0.50~0.80 0.035 0.035 0.25 0.30 0.25 15 U20702 75 0.72~0.80 0.17~0.37 0.50~0.80 0.035 0.035 0.25 0.30 0.25 16 U20802 80 0.77~0.85 0.17~0.37 0.50~0.80 0.035 0.035 0.25 0.30 0.25 17 U20852 85 0.82~0.90 0.17~0.37 0.50~0.80 0.035 0.035 0.25 0.30 0.25 18 U21152 15 Mn 0.12~0.18 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25 19 U21202 20 Mn 0.17~0.23 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25 20 U21252 25 Mn 0.22~0.29 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25 21 U21302 30 Mn 0.27~0.34 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25 22 U21352 35 Mn 0.32~0.39 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25 23 U21402 40 Mn 0.37~0.44 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25 24 U21452 45 Mn 0.42~0.50 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25 25 U21502 50 Mn 0.48~0.56 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25 26 U21602 60 Mn 0.57~0.65 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25 27 U21652 65 Mn 0.62~0.70 0.17~0.37 0.90~1.20 0.035 0.035 0.25 0.30 0.25 28 U21702 70 Mn 0.67~0.75 0.17~0.37 0.90~1.20 0.035 0.035 0.25 0.30 0.25 Elements not in the table cannot be added without buyer’s agreement. Measures shall be taken to prevent elements of scrap steel or other raw materials from being brought in to affect the performance of steel. a Copper content in thermal pressure processing steel shall not exceed 0.20%; b For killed steel deoxidized by aluminum, there is no lower limit for the content of carbon and manganese; the upper limit of manganese content is 0.45%; silicon content is not more than 0.03%; aluminum content is 0.020%~0.070%; the designation is 08Al. 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 14 Surface quality Piece by piece On whole steel bar Visual inspection or GB/T 28300 15 Size, appearance Piece by piece O... .......Source: https://www.ChineseStandard.net/PDF.aspx/GBT699-2015 |