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Q/BQB 303-2014 (Q/BQB 303-2023 Newer Version) PDF English


Q/BQB 303-2014 (Q/BQB303-2014, QBQB 303-2014, QBQB303-2014)
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
Q/BQB 303-2023English529 Add to Cart 4 days Continuously hot-rolled steel sheet and strip for general structure  
Q/BQB 303-2020English165 Add to Cart 0-9 seconds. Auto-delivery. Continuously hot-rolled steel sheet and strip for general structure
Q/BQB 303-2018English289 Add to Cart 3 days (Hot-rolled steel plate and steel strip for general structure) Obsolete
Q/BQB 303-2014English180 Add to Cart 0-9 seconds. Auto-delivery. Continuously hot-rolled steel sheet and strip for general structure Obsolete
Q/BQB 303-2009English599 Add to Cart 3 days Structural use of hot-rolled steel sheet and strip Obsolete
Newer version: Q/BQB 303-2023     Standards related to (historical): Q/BQB 303-2023

Q/BQB 303-2014: PDF in English (QBQB 303-2014)

Q/BQB 303-2014 ENTERPRISE STANDARD OF BAOSTEEL GROUP CORPORATION Replacing Q/BQB 303-2009 Continuously hot-rolled steel sheet and strip for general structure ISSUED ON. MAY 5, 2014 IMPLEMENTED ON. SEPTEMBER 1, 2014 Issued by. Baosteel Group Corporation Table of Contents Foreword ... 3  1 Scope ... 5  2 Normative references ... 5  3 Classification and code ... 6  4 Order required information ... 7  5 Size, shape, weight and tolerance ... 8  6 Technical requirements ... 8  7 Inspection and test ... 18  8 Packaging, marks and inspection documents ... 20  9 Rounding rules ... 20  10 Annex ... 20  Annex A ... 21  Foreword This Standard was drafted in accordance with the rules given in GB/T 1.1-2009 Directives for standardization - Part 1. Structure and drafting of standards. This Standard referred to JIS G 3101-2010, JIS G 3106-2008, JIS G 3132-2011, EN 10025-2.2004, EN 10113-2.1993, DIN 17100-80 and combined with the actual conditions of BaoSteel to formulate. This Standard replaces Q/BQB 303-2009. Compared with Q/BQB 303-2009, the main changes in this Standard are as follows. - modified the standard name to “Continuously hot-rolled steel sheet and strip for general structure”; - synchronously modified the “Scope” of this Standard with the change of standard name, and deleted “part used for mechanical structure after further processing and heat treatment”; - updated the versions of normative references; - deleted the designations in the brackets in Table 1, Table 3; - modified “structure used” in the “category” of Table 1 to “general structure used”; - expanded SM400A, SM400B, SM490A nominal thickness of which the upper limit was expanded to 20 mm; - deleted C22, C35, S20C, S35C, S45C designations used for mechanical structure and technical requirements; and added the content into Q/BQB 360-2014; - deleted C22, C35, S20C, S35C and S45C recommended heat treatment system, the comparison table of similar designations with relevant standards in the annex; - made other editorial modifications. This Standard was proposed by Manufacturing Management Department of BaoSteel Group Corporation. This Standard shall be under the jurisdiction of Manufacturing Management Department of BaoSteel Group Corporation. Continuously hot-rolled steel sheet and strip for general structure 1 Scope This Standard specifies the size, shape, technical requirements, testing and inspection, packaging, marks and inspection documents, etc. of continuously hot-rolled steel sheet and strip for general structure. This Standard is applicable to the continuously hot-rolled steel sheet and strip for general structure manufactured by BaoSteel Group Corporation as well as cross-cutting steel plate and longitudinal cutting strip thereby (hereinafter referred to as steel plate and steel). The products are mainly used for structural parts in construction, bridges, ships, vehicles, etc. 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 222-2006 Permissible Tolerances for Chemical Composition of Steel Products GB/T 223 Methods for Chemical Analysis of Iron, Steel and Alloy GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1 . Method of test at room temperature GB/T 229-2007 Metallic Materials - Charpy Pendulum Impact Test Method GB/T 232-2010 Metallic materials - Bend test GB/T 2975-1998 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing GB/T 4336-2002 Standard Test Method for Spark Discharge Atomic Emission Spectrometric Analysis of Carbon and Low-Alloy Steel (Routine Method) GB/T 4340.1-2009 Metallic materials - Vickers hardness test - Part 1. Test method GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 20066-2006 Steel and Iron-Sampling and Preparation of Samples for the Determination of Chemical Composition GB/T 20123-2006 Steel and iron - Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method) Q/BQB 300 General rules for the packaging, marks and inspection documents of hot rolled steel sheets and strip Q/BQB 301 Hot-rolled steel sheets and strips - Dimensions, shape, weight and tolerances 3 Classification and code 3.1 Designation, nominal thickness and use of steel plate and strip are shown in Table 1. 3.2 Classify according to surface treatment method into. pickling surface rolling surface 3.3 Classify according to surface quality grade into. ordinary surface FA higher surface FB 3.4 Classify according to product category into. hot-rolled steel strip hot-rolled steel plate hot-rolled longitudinal cutting steel strip hot-rolled pickling steel strip hot-rolled pickling steel plate 6.1.1 The designation and chemical composition (melting analysis) of steel shall comply with the provisions of Table 3 ~ Table 5. 6.1.2 The content of residual elements in steel shall comply with the following provisions. Cu ≤ 0.20%, Cr ≤ 0.15%, Ni ≤ 0.15%; however, if the supplier can ensure that the contents of Cu, Cr, Ni, the residual elements, in steel comply with the aforementioned provisions, the chemical analysis of these elements may not be carried out. 6.1.3 The tolerance of finished chemical composition of steel plate and strip shall comply with the provisions of GB/T 222. 6.2 Smelting method The steel used for steel plate and strip uses oxygen converter smelting. 6.3 Delivery state The steel plate and strip shall be delivered in hot-rolling state or controlled rolling state. Table 3 Designation Chemical composition a (mass fraction) % C Si Mn P S N b Ceq c SS330 ≤ 0.15 ≤ 0.30 ≤ 0.95 ≤ 0.035 ≤ 0.035 - - SS400 ≤ 0.21 ≤ 0.30 ≤ 1.40 - - SS490 ≤ 0.22 ≤ 0.25 ≤ 1.40 - - SS540 ≤ 0.30 ≤ 0.25 ≤ 1.60 - - S185 - - - ≤ 0.040 ≤ 0.040 - - S235JR ≤ 0.17 ≤ 0.35 ≤ 1.40 ≤ 0.035 ≤ 0.035 ≤ 0.012 ≤ 0.35 S235J0 ≤ 0.030 ≤ 0.030 S235J2 ≤ 0.025 ≤ 0.025 - S275JR ≤ 0.21 ≤ 0.35 ≤ 1.50 ≤ 0.035 ≤ 0.035 ≤0.012 ≤ 0.40 S275J0 ≤ 0.18 ≤ 0.030 ≤ 0.030 S275J2 ≤ 0.18 ≤ 0.025 ≤ 0.025 - E295 ≤ 0.30 ≤ 0.35 ≤ 1.60 ≤ 0.035 ≤ 0.035 ≤ 0.012 - S355JR ≤ 0.24 ≤ 0.55 ≤ 1.60 ≤0.035 ≤0.035 ≤0.012 ≤ 0.45 S355J0 ≤ 0.20 ≤ 0.030 ≤ 0.030S355J2 ≤ 0.20 ≤ 0.025 ≤ 0.025 ‐ S355K2 ≤ 0.20 ≤ 0.025 ≤ 0.025 Table 5 Designation Chemical composition (mass fraction) % C Si Mn P S Other a SPHT1 ≤ 0.10 ≤ 0.35 ≤ 0.50 ≤ 0.035 ≤ 0.035 - SPHT2 ≤ 0.18 ≤ 0.60 SPHT3 ≤ 0.25 0.30 ~ 0.90 SPHT4 ≤ 0.30 0.30 ~ 1.00 a Other alloying elements can be added as required. 6.4 Surface treatment method 6.4.1 Surface treatment of steel plate and strip can use two methods. rolling surface and pickling surface. 6.4.2 The steel plate and strip of pickling surface can be delivered in oiled state or un-oiled state. The oiled pickling steel plate and strip, under normal packaging, transport, handling and storage conditions, the supplier shall ensure that the product shall not have rust within three months since the date of production, and the oil film shall be removed by alkaline aqueous solution. If the buyer requires the delivery in unoiled pickling steel plate and strip, it shall be indicated in the contract. It is easy for the unoiled pickling steel plate and strip to have rust and abrasion during transport and processing and the supplier does not guarantee this. 6.5 Mechanical and processing properties 6.5.1 The mechanical and processing properties of steel plate and strip should comply with the corresponding provisions in Table 6 ~ Table 10. 6.5.2 After bending test, there shall be no visible cracks at the outer surface of the specimen. If the supplier can ensure qualified bending test, it may not carry out this test. 6.5.3 The impact energy value is the average value of a set of three test specimens. The test result of one specimen is allowed to be less than the predetermined value but not less than 70% of the predetermined value. 6.5.4 The impact test specified in Table 6 ~ Table 8 is only applicable to the product of which the thickness t ≥ 12.0 mm. If the user requires to carry out the impact test for the product of which the thickness t < 12.0 mm, it shall be indicated in the contract based on the negotiation between both parties to use 10 mm × 7.5 mm specimen or 10.0 mm × 5.0 mm specimen. The minimum impact energy required at this time shall be respectively 5/6 or 2/3 of the impact energy listed in Table 6 ~ Table 8. 6.5.5 According to buyer’s requirements, after negotiating between both parties and specifying in the contact, it ... ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.