Overview
CCS FQ47 is an extra-high-strength marine steel plate certified by the China Classification Society. The FQ designation signifies a quenched and tempered steel with impact toughness tested at minus 60 degrees C, ensuring exceptional performance in Arctic and polar environments. CCS FQ63 is an ultra-high-strength marine steel plate also certified by CCS, manufactured through quenching and tempering, designed for the most demanding applications such as self-elevating drilling platforms, ultra-large container ships, and critical marine structures.
Mechanical Properties
CCS FQ47 has a minimum yield strength of 460 MPa, tensile strength of 570 to 720 MPa, and minimum elongation of 17 percent, with impact energy of 31 J transverse and 46 J longitudinal at minus 60 degrees C. CCS FQ63 has a minimum yield strength of 620 MPa, tensile strength of 720 to 890 MPa, and minimum elongation of 15 percent, with impact energy of about 46 J transverse and 69 J longitudinal at minus 60 degrees C.
Chemical Composition
Both grades limit carbon to 0.18 percent, silicon to 0.55 percent, manganese to 1.60 percent, phosphorus and sulfur to 0.025 percent, and nitrogen to 0.02 percent, with carbon equivalent limits ensuring good weldability.
Applications
FQ47 is used for critical structural components in offshore drilling rigs, icebreakers, and Arctic-class vessels. FQ63 is designed for the most demanding load-bearing applications requiring maximum strength-to-weight ratio, such as self-elevating drilling platforms and ultra-large container ships.
Selection Guidance
Choose FQ47 for high-strength offshore platforms and ice-class vessels where balanced strength and cost matter. Choose FQ63 where the design requires maximum strength with reduced plate thickness in the most extreme Arctic conditions.
Frequently Asked Questions
Q: What is the yield strength of CCS FQ47?
A: 460 MPa minimum, with tensile strength of 570 to 720 MPa and 17 percent elongation.
Q: What is the yield strength of CCS FQ63?
A: 620 MPa minimum, with tensile strength of 720 to 890 MPa and 15 percent elongation.
Q: What impact temperature applies?
A: Minus 60 degrees C for both grades, for Arctic and polar service.
Q: What does FQ mean?
A: Quenched and tempered steel with impact testing at minus 60 degrees C.
Q: Where is FQ63 used?
A: In self-elevating drilling platforms, ultra-large container ships, and maximum-strength marine structures.
Q: What is the elongation difference?
A: FQ47 requires 17 percent and FQ63 15 percent minimum elongation.
For CCS FQ47 and FQ63 certified marine steel plate quotations, contact our sales team.
