1 Scope
This standard specifies the technical requirements, test methods and inspection rules, etc. for low-alloy steel forgings for low temperature pressure equipments.
This standard is applicable to low-alloy steel forgings for low temperature pressure equipments with a design temperature lower than 0℃ and design pressure below 100Mpa.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, only the dated versions apply to this standard. For undated references, the latest edition of the normative document (include all the amendments) is applicable to this standard.
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 Metallic Materials - Tensile Testing at Ambient Temperature (ISO 6892:1998(E))
GB/T 229—2007 Metallic Materials-Charpy Pendulum Impact Test Method (ISO 148-1:2006)
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission Spectrometric Analysis of Carbon and Low-alloy Steel (Routine Method)
GB/T 6394 Metal-methods for Estimating the Average Grain Size (ASTM E112:1996)
GB/T 10561 Steel Determination of Content of Nonmetallic Inclusions-Micrographic Method Using Standards Diagrams (ISO 4967:1998)
GB/T 20066 Steel and Iron-Sampling and Preparation of Samples for the Determination of Chemical Composition (ISO 14284:1996)
JB/T 4730.3 Nondestructive Testing of Pressure Equipments-Part 3: Ultrasonic Testing
3 Terms and Definitions
This standard applies the following terms and definitions.
3.1
Hollow forging
It refers to axisymmetrical hollow forging whose axial length L is greater than its outer diameter D, as shown in Figure 1a). t shall be the nominal thickness.
3.2
Ring forging
It refers to axisymmetrical hollow forging whose axial length L is less than or equal to its outer diameter D, as shown in Figure 1b). The smaller one of L and t shall be the nominal thickness.
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Order Contents
5 Technical Requirements
6 Test Methods
7 Inspection Rules
Appendix A (Normative) Additional Requirements
