Technical specification for low temperature service steel casting for valves
1 Scope
This standard specifies the technical requirements, test methods, inspection rules and markings of low temperature service steel casting for valves (hereinafter referred to as "castings").
This standard is applicable to valves, flanges and other pressure bearing castings used under low temperature conditions of -254 °C ~ -29 °C.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this national standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 222-2006 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 228-2002 Metallic materials — Tensile testing at ambient temperature (ISO 6892:1998(E), MOD)
GB/T 229-1994 Metallic materials — Charpy notch impact test (eqv ISO 148:1983)
GB/T 6414-1999 Castings — System of dimensional tolerances and machining allowances (eqv ISO 8062:1994)
GB/T 9452-2003 Testing method for work zone of heat treatment furnace
GB/T 11352-1989 Carbon steel castings for general engineering purposes (neq ISO 3755:1991)
GB/T 12224-2005 General requirements for industrial steel valves
GB/T 12230-2005 General purpose industrial valve — Specification of stainless steel castings
GB/T 12467.1 ~ 12467.4-1998 Quality assurance of welding — General principle (idt ISO 3834-1 ~ 3834-4:1994)
GB/T 13927 Pressure testing for general purpose valves (GB/T 13927-1992, neq ISO 5208:1982)
GB/T 15169-2003 Qualification test of welders — Fusion welding for steels (ISO/DIS 9606-1:2002, IDT)
JB/T 6439 Methods of magnetic examination for valves
JB/T 6440 Methods of radiographic examination for steel castings valves
JB/T 6902 Methods for liquid penetrant examination of valves
JB/T 7927 Valve cast steel visual quality requirements
ASTM A351/A351M Standard specification for castings, austenitic, for pressure-containing parts
ASTM A352/A352M Standard specification for steel castings, ferritic and martensitic, for pressure-containing parts, suitable for low-temperature service
3 Technical requirements
3.1 Material designation and service temperature
See Table 1 for material designation and service temperature of castings.
Table 1 Material designation and service temperature of castings
Foreword i
1 Scope
2 Normative references
3 Technical requirements
3.1 Material designation and service temperature
3.2 Chemical composition and mechanical properties
3.3 Heat treatment
3.4 Quality requirements
3.5 Repair welding
4 Test methods and inspection rules
4.1 Chemical analysis
4.2 Mechanical properties
4.3 Nondestructive testing
4.4 Purchaser inspection
5 Marking
Table 1 Material designation and service temperature of castings
Table 2 Chemical compositions of castings (mass fraction)
Table 3 Mechanical properties of castings
Table 4 Minimum preheating temperature
