JB/T 7028-2004Technical requirements for disc and wheel forgings of steam turbines below 25 MW (English PDF)

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