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GB 3078-1982 English PDF (GB/T 3078-2019 Newer Version)

GB 3078-1982_English: PDF (GB3078-1982)
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 3078-2019English135 Add to Cart 0--9 seconds. Auto-delivery Quality structural steel cold drawn bars Valid GB/T 3078-2019
GB/T 3078-2008English85 Add to Cart 0--9 seconds. Auto-delivery Quality structural steel cold drawn bars Obsolete GB/T 3078-2008
GB/T 3078-1994English359 Add to Cart 3 days [Need to translate] Technical requirements for quality structural steel cold drawn bars Obsolete GB/T 3078-1994
GB 3078-1982English319 Add to Cart 3 days [Need to translate] Technical requirements for cold drawn quality structure steel bars Obsolete GB 3078-1982
Preview PDF: GB/T 3078-2019    Standards related to: GB 3078-1982

BASIC DATA
Standard ID GB 3078-1982 (GB3078-1982)
Description (Translated English) Technical requirements for cold drawn quality structure steel bars
Sector / Industry National Standard
Classification of Chinese Standard H44
Word Count Estimation 8,843
Date of Issue 1982/5/10
Date of Implementation 1983/3/1


GB/T 3078-2019 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.60 H 44 Replacing GB/T 3078-2008 Quality structural steel cold drawn bars ISSUED ON: AUGUST 30, 2019 IMPLEMENTED ON: JULY 01, 2020 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of Contents Foreword ... 3  1 Scope ... 4  2 Normative references ... 4  3 Terms and definitions ... 5  4 Classification ... 6  5 Order content ... 6  6 Size, shape and allowable deviation ... 7  7 Technical requirements ... 7  8 Test method ... 12  9 Inspection rules ... 14  10 Packaging, marking and quality certificate ... 15  Quality structural steel cold drawn bars 1 Scope This Standard specifies the classification, ordering content, size, shape and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of structural steel cold drawing and cold drawing polish steels. This Standard applies to quality carbon structural steel and alloy structural steel cold drawing bars (round steel, square steel and hexagonal steel) and cold drawing polish round steel (hereinafter collectively referred to as "steel"). 2 Normative references The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 222, Permissible tolerances for chemical composition of steel products GB/T 224, Determination of depth of decarburization of steels GB/T 225, Steel - Hardenability test by end quenching (Jominy test) GB/T 226, Test method for macrostructure and defect of steel by etching 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 341-2008, Steel wire - Classification and terminology GB/T 699, Quality carbon structural steels GB/T 905-1994, Dimension, shape, weight and tolerance for cold-drawn round, square and hexagonal steels GB/T 1814, Inspection method for steel work fractures 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 2975-2018, Steel and steel products. Location and preparation of samples and test pieces for mechanical testing GB/T 3077, Alloy Structure Steels GB/T 3207-2008, Bright steel GB/T 4162, Forged and rolled steel bars. Method for ultrasonic testing GB/T 6394, Determination of estimating the average grain size of metal GB/T 7736, Ultrasonic inspecting method for macro-structure and imperfection of steel GB/T 8170, 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 13298, Inspection methods of microstructure for metals 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 34474.1, Determination of banded structure of steel - Part 1: Micrographic method using standards diagrams YB/T 5293, Metallic materials - Forging test 3 Terms and definitions Terms and definitions determined by GB/T 341-2008 and GB/T 3207-2008 are applicable to this document. For ease of use, some of the terms and definitions in GB/T 341-2008 and GB/T 3207-2008 are repeated below. 3.1 Cold drawing A process in which it is formed by pressure processing methods such as die drawing or roll drawing at normal temperature. [GB/T 341-2008, Definition 3.1.6] it is not specified, perform according to the provisions of level 2. If the supplier can guarantee, it may not be tested. Table 5 -- Surface roughness of the cold drawing polish round steel Roughness level Code Surface roughness Ra/μm Level 1 FB ≤ 1.6 Level 2 FA ≤ 3.2 7.9.5 The steel that is straightened by a slanting roll is allowed to have threaded roll marks on the surface. 7.9.6 The surface quality of cold drawing square steel and hexagonal steel shall be in accordance with the provisions of steel for cutting. 7.10 Special requirements. According to the requirements of the buyer, if it is negotiated between the supplier and the buyer, and specified in the contract, steels of the following special requirements can be supplied: a) reduce the chemical composition range; b) impact absorption energy of the steel in the delivery state; c) specify upper and lower limits of mechanical properties; d) inspect the layered fracture; e) inspect the banded structure; f) inspect the grain size; g) inspect the end hardenability; h) inspect the non-metallic inclusions; i) perform a non-destructive testing; j) others. 8 Test method The inspection items and test methods of each batch of steels shall comply with the requirements of Table 6. Table 6 -- Inspection item, sampling quantity, sampling position and test method of steels Inspection item Sampling quantity Sampling portion Test method a For round steel and hexagonal steel, respectively perform according to Figure A.4 and a), b) and d) of Figure A.6 of GB/T 2975-2018; for square steel, perform according to a), c), e), f) of Figure A.8 of GB/T 2975-2018. b For round steel and hexagonal steel, respectively perform according to Figure A.5 and a), b) and d) of Figure A.7 of GB/T 2975-2018; for square steel, perform according to Figure A.9 of GB/T 2975-2018. 9 Inspection rules 9.1 Inspection and acceptance 9.1.1 The delivery inspection and acceptance of steels shall be carried out by the supplier's quality and technical supervision department. 9.1.2 The supplier shall ensure that the delivered steel meets the requirements of this Standard or the contract. If necessary, the buyer has the right to inspect and accept according to any inspection item that is specified in this Standard or the contract. 9.2 Batch rules the steels shall be inspected and accepted in batches. Each batch shall consist of steels of the same designation, the same heat number, the same processing method, the same size, the same delivery state, and the same heat treatment system (heating). For steels that are remelted and smelted by electroslag (excluding aluminum steel), under the conditions of stable process and guaranteed requirements of this Standard, it’s allowed to be delivered in batches of smelting master furnace number of consumable electrodes. 9.3 Sampling quantity and sampling portion The sampling quantity and sampling portion of the steels shall comply with the requirements of Table 6. 9.4 Re-inspection and determination rules 9.4.1 The re-inspection and determination rules of the steels shall comply with the provisions of GB/T 17505. 9.4.2 If the supplier can ensure that the steel is qualified, for the test results of the mechanical properties, macrostructure and non-metallic inclusions of steels or steel billet of the same heat number, it is allowed to replace the steel with billet, and replace the small one with the large one. 9.4.3 The test and inspection results of the steels shall be rounded off by rounding-off value the comparison method to the number that is indicated by ......