DIRECT ANSWERDo not substitute Q345R and Q355R by comparing grade numbers on a web page. The authorized design must use the applicable material standard and edition, service, thickness, temperature, supply condition and added requirements.
Material-basis verification
- Applicable standard and edition
- Service, design temperature and thickness
- Supply condition and supplementary properties
- Welding, heat treatment and inspection impacts
Relevant manufacturing capability
- Material identification and traceability control
- Qualified welding and heat-treatment process planning
- NDE, repair and manufacturing-record closeout
Key notes
- Availability or similar strength does not authorize substitution.