This specification specifies the requirements for chromium-molybdenum steel and carbon-molybdenum steel materials, welder qualifications and welding procedure qualification, pre-welding preparation, welding procedures, post-weld heat treatment, welding inspection and repair. This specification is applicable to the welding construction of electrode arc welding, gas tungsten arc welding, gas metal arc welding and submerged arc welding for chromium-molybdenum steel and carbon-molybdenum steel pipelines and equipment in the petrochemical, natural gas chemical, and coal chemical industries.
SH/T 3520-2015 history
2015SH/T 3520-2015 Welding specification of chrome molybdenum steel in petrochemical industry
2004SH/T 3520-2004 Welding specification of chrome molybdenum steel for petrochemical engineering
1970SH 3520-1991 Technical specification for welding of chrome-molybdenum heat-resistant steel pipes in petrochemical engineering