Products FAQ

Thickness ≤50 mm: Not mandatory, but recommended for critical welds.

Thickness >50 mm or for use in hydrogen sulphide or wet corrosion environments: Post-weld heat treatment is mandatory to eliminate residual welding stresses and prevent hydrogen-induced cracking.

Yes, A516Gr70 steel plates are suitable for the manufacture of LNG, LPG and liquid nitrogen storage tanks, but must undergo impact testing at -40°C/-46°C as required.

Yes, the standard mandates that they be supplied in a normalised condition.

Normalising: Heating to 30–50°C above Ac3, followed by air cooling, to refine the grain structure, relieve internal stresses and significantly improve low-temperature toughness.

Hot-rolled or controlled-rolled conditions cannot consistently meet impact requirements and are not a substitute for normalisation.

Standard Safe Temperature Range: -29°C to 343°C

This is the range recommended for long-term stable operation in engineering design. Within this temperature range, the mechanical properties of the material (such as strength and toughness) can be reliably guaranteed.

Extreme Temperature Limits: -46°C to 538°C

Lower Temperature Limit (-46°C): By using steel plates supplied in the normalised condition (commonly referred to as Gr.70N), the material can meet impact toughness requirements down to -46°C.

Upper Temperature Limit (538°C): According to ASME codes, the maximum permissible service temperature for this material in non-corrosive environments is 538°C.

ABS Grade E marine steel plates offer good weldability and have a low carbon equivalent. However, when welding thick plates, it is recommended to preheat appropriately depending on the ambient temperature and to use low-hydrogen welding consumables (such as E7018 or submerged arc welding flux certified by the classification society) to prevent cold cracks and maintain low-temperature toughness in the joint.

For use in areas requiring high low-temperature toughness, such as hull structures, decks, bulkheads, ice-exposed zones, icebreakers, polar vessels and offshore platforms.

Normalising refines the microstructure of the steel and ensures a uniform distribution of carbides. For Grade E, a material that must retain its toughness at -40°C, normalising is a standard process requirement for eliminating internal stresses and improving low-temperature impact resistance.

Among the major international classification societies, the following grades are generally regarded as equivalent to ABS Grade E:

Yes. We can provide 100% ultrasonic testing (UT) and can include third-party inspection reports upon request.

Yes, up to 200mm, but normalizing heat treatment is required to ensure mechanical properties.