Standard No.:	JB/T 7028-2004
English Name:	Specification for the disk and wheel forgings for steam turbine (25MW and lower)
Chinese Name:	25MW以下汽轮机轮盘及叶轮锻件 技术条件
Chinese Classification:	J32    Forging and pressing
Professional Classification:	JB    Professional Standard - Machinery
ICS Classification:	77.140.85 77.140.85    Iron and steel forgings 77.140.85
Issued by:	德阳大型铸锻件研究所
Issued on:	2004-10-20
Implemented on:	2005-4-1
Status:	superseded
Superseded by:	JB/T 7028-2018 Disk and wheel forgings for 25 MW steam turbines and below一Technical specication
Superseded on:	2018-10-1
Superseding:	JB/T 7028-1993
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	100.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the technical requirements, test methods, inspection rules, quality certificate and marking of carbon and low-alloy steel disk and wheel forgings for steam turbine (25MW and lower). This standard is applicable to the ordering, manufacturing and acceptance of disk and wheel forgings for steam turbine (25MW and lower). 2 Normative References The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies. GB/T 222 Method of Sampling Steel for Determination of Chemical Composition and Permissible Variations for Product Analysis GB/T 223 (All Parts) Methods for Chemical Analysis of Iron, Steel and Alloy GB/T 228 Metallic Materials - Tensile Testing at Ambient Temperature (GB/T 228-2002, eqv ISO 6892: 1998(E)) GB/T 229 Metallic Materials - Charpy Notch Impact Test (GB/T 229-1994, eqv ISO 148: 1983) GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method (GB/T 231.1-2002, ISO 6506-1: 1999(E) GB/T 6394 Metal-methods for Estimating the Average Grain Size (GB/T 6394-2002, ASTM E112: 1996, MOD) JB/T 1582 Ultrasonic Testing for the Detection of Impeller Forgings of Steam Turbine JB/T 8468 Magnetic Particle Examination Method for Steel Forgings JB/T 8888 Test Method for Measuring Residual Stresses by the Ring-core Method in Rotor Forgings for Turbine and Generator 3 Ordering Requirements

Foreword I 1 Scope 2 Normative References 3 Ordering Requirement 4 Technical Requirements 4.1 Manufacturing Method 4.2 Chemical Composition 4.3 Mechanical Property 4.4 Hardness Uniformity 4.5 Residual Stress 4.6 Non-destructive Inspection 4.7 Grain Size 5 Test Methods and Inspection Rules 5.1 Chemical Analysis 5.2 Mechanical Property 5.3 Hardness Uniformity Inspection 5.4 Magnetic Particle Inspection 5.5 Ultrasonic Inspection 5.6 Residual Stress Inspection 5.7 Dimension Inspection 5.8 Grain Size Inspection 5.9 Re-test 5.10 Re-heat Treatment 6 Acceptance and Quality Certificate 7 Marking and Packaging