A 645 Gr A / A 645 Gr B - Cost reduction and increased safety for ethylene and LNG tank manufacturing
With the latest revision of API Standard 620 – “Design and Construction of Large, Welded, Low-Pressure Storage Tanks” in 2018, it is now possible to utilize the ASTM grades A 645 Gr A and Gr B for building gas storage tanks for e.g. ethylene, LPG or LNG.
Utizing our state of the art production route, voestalpine Grobblech GmbH is able to deliver both A 645 Gr A and Gr B in addition to the traditional 5% and 9% standard nickel steel grades.
Choosing ASTM A 645 Gr A for ethylene tank manufacturing our customers will benefit from approx. 15% higher material strength, an additional safety margin and decreasing material costs due to a reduced overall wall thickness.
Using the ASTM A 645 Gr B instead of the conventional 9% nickel steel, the reduction of the nickel content by approx. 30% beneficially affects the material investment when building all types of LNG tanks for onshore and offshore as well as fuel tank application.
Natural gas is liquefied at the extremely low temperature of -164 °C, shrinking its volume by a factor of 600. This makes its storage and transport possible and economically efficient. At these very low temperatures, the utilization of special 9 % nickel steels or ASTM A 645 Gr B is necessary in order to guarantee sufficient toughness and resistance to brittle cracking. We supply extra wide plates to this market segment, even with a thickness of 5 mm.
The LPG process is used to produce propane and process gases from natural gas. These gases are liquefied at room temperature at low pressure and are stored in special tanks made of 5 % nickel steels or ASTM A 645 Gr A. We supply shell plates and vessel heads from a single source.
Highest quality for the highest degree of safety
The basis of our high-quality nickel plates are high-purity slabs from our own steelmaking plant. The very low carbon content guarantees perfect weldability. Further advantages are found in the product's excellent impact strength and the fracture-mechanical properties (CTOD). The entire plate surface undergoes ultrasonic testing. The residual magnetism is below 50 gauss.
Preprocessing to meet specific customer requirements
|Steel group||Standard||Steel grades|
|5 % nickel steels|
A/SA 645 Grade A
|5.5 % nickel steels||ASTM/ASME 645||A/SA 645 Grade B|
|9 % nickel steels|
A/SA 553 Type 1
5 % nickel steels: 5–70 mm (A 645 Gr A 5-50 mm)
5.5 % nickel steels: 5-50 mm
9 % nickel steels: 5–60 mm
1,600–3,800 mm, extra wide plates: 9 % nickel steels with a thickness of 5 mm are available in widths up to 2,800 mm.
12,700 mm max.
At least 2 tons per line item
13.0 tons max. per single plate
*) detailed dimensions upon request.
Our product quality is certified by all of the leading certification institutions. We also meet the highest requirements of KOGAS, the state-operated Korean gas company.
Certifications for 5 % nickel steels
Certifications for 9 % nickel steels