HOME   Cart(0)   Quotation   About-Us Tax PDFs Standard-List Powered by Google www.ChineseStandard.net Database: 189759 (9 Feb 2025)

GB/T 12228-2006 English PDF (GB/T 12228-1989)

GB/T 12228-2006_English: PDF (GB/T12228-2006)
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 12228-2006English70 Add to Cart 0--9 seconds. Auto-delivery General purpose industrial valves -- Specification of carbon steel forgings Valid GB/T 12228-2006
GB/T 12228-1989English199 Add to Cart 2 days [Need to translate] General purpose industrial valves. Specification of carbon steel forgings Obsolete GB/T 12228-1989


BASIC DATA
Standard ID GB/T 12228-2006 (GB/T12228-2006)
Description (Translated English) General purpose industrial valves. Specification of carbon steel forgings
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J16
Classification of International Standard 23.060.00
Word Count Estimation 7,727
Date of Issue 2006-12-25
Date of Implementation 2007-05-01
Older Standard (superseded by this standard) GB/T 12228-1989
Drafting Organization Qingdao Power Station Valve Co., Ltd.
Administrative Organization National Technical Committee of Standardization valve
Regulation (derived from) National Standard Approval Announcement 2006 No.13 (Total No.100)
Proposing organization China Machinery Industry Federation
Issuing agency(ies) Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China
Summary This standard provides a common valve, flange, pipe fittings pressure carbon steel forgings requirements, test methods, inspection rules, ordering requirements, marking and quality certificate. This standard applies to general purpose valves, flange, pipe fittings pressure carbon steel forgings. Refer to perform non-pressure forgings.

BASIC DATA
Standard ID GB/T 12228-1989 (GB/T12228-1989)
Description (Translated English) General purpose industrial valves. Specification of carbon steel forgings
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J16
Classification of International Standard 23.06
Word Count Estimation 3,341
Date of Issue 1990/1/4
Date of Implementation 1990/12/1
Adopted Standard ASTM A105-1980, NEQ
Regulation (derived from) Announcement of Newly Approved National Standards No. 13, 2006 (No. 100 overall)
Proposing organization People Republic of China Ministry of Machinery and Electronics Industry
Issuing agency(ies) State Bureau of Technical Supervision


GB/T 12228-2006 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.060.00 J 16 Replacing GB/T 12228-1989 General purpose industrial valves - Specification of carbon steel forgings ISSUED ON: DECEMBER 25, 2006 IMPLEMENTED ON: MAY 01, 2007 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of Contents Foreword ... 3  1 Scope ... 4  2 Normative references ... 4  3 Requirements ... 5  4 Test methods ... 8  5 Inspection rules ... 9  6 Ordering requirements ... 10  7 Marking and quality certificate ... 10  General purpose industrial valves - Specification of carbon steel forgings 1 Scope This Standard specifies the requirements, test methods, inspection rules, order requirements, markings and quality certificates of compression carbon steel forgings, such as general purpose industrial valves, flanges, and pipe fittings. This Standard applies to compression carbon steel forgings, such as general purpose industrial valves, flanges, and pipe fittings (hereinafter referred to as forgings). It can be implemented by reference for non-compression forgings. 2 Normative references The terms in the following documents become the terms of this Standard by reference to this Standard. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this standard. However, parties to agreements that are based on this Standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this Standard. GB 150, Steel pressure vessels GB/T 228, Metallic Materials - Tensile Testing at Ambient Temperature (GB/T 228-2002, eqv ISO 6892:1998) 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 231.1-2002, eqv ISO 6506-1:1999) GB/T 699, Quality carbon structural steels GB/T 2975, Steel and steel products - Location and preparation of samples and test pieces for mechanical testing (GB/T 2975-1998, eqv ISO 377:1997) GB/T 13927, Industrial Valves - Pressure Testing (GB/T 13927-1992, neq ISO 5208,1982) JB 4726, Carbon and Low-alloy Steel Forgings for Pressure Vessels JB 4730, Nondestructive Testing for Pressure Equipment 3.5.3 The preparation method of the test piece of mechanical properties shall be in accordance with the provisions of GB/T 2975; the following methods can be selected: a) directly on the part; b) on the extension of the forging; c) the same blank for manufacturing the cross section. 3.6 Quality requirements 3.6.1 The surface quality of the forgings shall be good and free of harmful defects. 3.6.2 When the depth of the forging defect reaches the limit size of the forging, it is a harmful defect and shall be scrapped. 3.6.3 If the defect depth of the forging does not reach the limit size of the forging, and it can be removed by machining or grinding, it is a non-hazardous defect, and can be treated as follows: a) If the folding depth does not exceed 5% of the limit size or 1.5 mm (whichever is the smaller value), it does not need to be removed. If the defect needs to be removed, mechanical processing or grinding shall be used; b) For defects such as pits, or damage caused by marking, if the depth does not exceed the stipulation of 3.6.3a), it does not need to be removed; c) When the defect exceeds 3.6.3a), the defect shall be removed by machining or grinding, but the limit size of the forging must be guaranteed. 3.6.4 Welding repair 3.6.4.1 Welding repair is allowed for forgings, or as specified in the order contract. 3.6.4.2 The welding process, post-weld heat treatment, non-destructive inspection of welding repair and the requirements for welders shall meet the requirements of GB 150. 3.6.4.3 The welding repair area shall not exceed 10% of the surface area of the forging; the depth shall not exceed one third of the limit size of the forging or 10 mm (whichever is less). Otherwise, the consent of the buyer shall be obtained. 3.6.4.4 Before the welding repair, all defects must be removed, and magnetic powder inspection or other effective inspection methods must be carried out as required. 3.6.4.5 After the welding repair, the welding area shall be polished and flattened, and inspected and eliminated according to 4.4. 3.6.4.6 All forgings that have undergone the welding repair shall be subjected to stress relief treatment. 3.6.4.7 The number of welding repairs for the same defect shall not exceed twice. 3.7 Forging grade 3.7.1 The grade and technical requirements of forgings (including rolled forgings) shall meet the requirements of JB 4726. 3.7.2 Forgings whose nominal pressure is PN2.5 ~ PN10 are allowed to use forgings of grade-1. 3.7.3 In addition to the provisions of 3.7.4, forgings whose nominal pressure is PN16 ~ PN63 shall meet the requirements for forgings of grade-II or above. 3.7.4 Forgings whose nominal pressure is not less than PN100 shall meet the requirements for forgings of grade-III. 4 Test methods 4.1 Tensile testing 4.1.1 Each batch of heat-treated forgings shall be subjected to a tensile testing. If the same batch of heat-treated forgings includes more than two rolling heat numbers, each rolling heat number shall be subjected to a tensile testing. 4.1.2 Under the same heat treatment conditions, if the temperature error is within ±14°C, and there is a high temperature recording device, the unified rolling heat number is required to have only one tensile testing. 4.1.3 The tensile testing method shall be carried out in accordance with the provisions of GB/T 228. 4.1.4 If the forging is too small to make the smallest test piece used for tensile testing on the forging, or the test piece parallel to the main deformation direction cannot be cut, and the test piece cannot be forged on the device, 1% of the batch or 10 pieces (whichever is the minimum) can be taken for the hardness test. 5.2 If the mechanical testing results do not meet the requirements of Table 4, the heat treatment shall be performed again in accordance with the provisions of 3.3, and the preparation of test pieces shall be carried out in accordance with the provisions of 3.5, and the test shall be carried out in accordance with the provisions of 5.1. However, the number of reheat treatments shall not exceed twice. 5.3 The pressure testing shall be carried out after the non-destructive test, and shall be carried out piece by piece. The forging department shall be responsible for the quality of the test forgings. 6 Ordering requirements 6.1 The order contract or inquiry sheet shall include the following: a) Product forging drawings, including requirements for surface roughness, tolerance, material grade number; b) Supplier’s forging process and drawing (if required, the buyer’s approval shall be required); c) The heat treatment and other requirements can be negotiated by both parties; d) Acceptance requirements and contents that need to be supplemented. 6.2 If the buyer finds scrapped products during product analysis or mechanical processing, it shall notify the forging department within the time that is specified in the contract; if there is no specification, it shall not exceed 30 days. 6.3 The scrapped forging samples shall be kept for 30 days from the date of sending the test report. The forging department may request re-examination during this period. 7 Marking and quality certificate 7.1 After passing the inspection, the forging shall be attached with a conformity mark, which shall include: a) Factory name or logo; b) Material code; c) Heat treatment code; d) Date of manufacture; ......

Similar standards: GB/T 12222-2023  GB/T 12223-2023  GB/T 12230-2023  
Similar PDFs (Auto-delivered in 9 seconds): GB/T 12225-2018  GB/T 12224-2015  GB/T 12220-2015  GB/T 12241-2021