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Applications of Steels

Steel for Shipbuilding and Offshore Platforms

A / B / D / E / AH-32 / DH-32 / EH-32 / AH-36 / DH-36 / EH-36 / AH-40 / DH-40 / EH-40

BS 4360/86 43 EE / BS 4360/87 50 D / API 2H 50 / API 2W 50 / SINCRON AH32-EH40

This steel grade is intended for manufacturing ship hulls and vessels in general, as well as for several types of oceanic structures, especially fixed offshore platforms, semi-submersible platforms, Tension-Leq Plataforms (TLPs), Floating, Production, Storage, and Offloading (FPSO), self-lifting platforms, and drillships, for which a guarantee of mechanical properties in welding is required. In general, shipbuilding steel is regulated by an ASTM standard or by the International classifying entities: American Bureau of Shipping – ABS, Bureau Veritas – BV, Det Norske Veritas – DNV, Germanischer Lioyd – GL, Lioyd´s Register of Shipping – LR, Nippon Kaiji Kyokai – NK, among others.

 

Steel Resistant to Atmospheric Corrosion

USI SAC / ASTM-A242 / ASTM-A588

It is weathering steel with outstanding resistance to atmospheric corrosion and a much-diversified application, such as in buildings, bridges, agricultural implements, mining, wagons, among others. It is microalloyed carbon-manganese steel, with good weldability, even with no painting, and also offer an excellent adherence in paint application. Of this grade, we highlight the USI SAC series steel.

 

Steel for Boilers and Pressure Vessels

ASTM-A285 (2003) / ASTM-A299 (2004) / ASTM-A455 (2003) / ASTM-A515 (2003)

ASTM-A516 (2006) / ASTM-A537 )2006) / ASTM-A612 (2006) / EM-10028-2-16Mo3 (2009)

Intended for boilers and pressure vessels, its suitability depends on the mechanical resistance and the temperature and work pressure conditions, specified by an ASTM standard and the relevant related standards ASME and EM 10028. The main characteristic of this steel is its performance versatility as to the use temperature, which ranges from -60°C to 500°C.

Additional requirements may be guaranteed upon request: impact test at low temperature (-40°C or lower), tensile strength at high temperature (300°C or higher), folding, Simulated Post-Weld Heat Treatment (SPWHT), and more specific ones.

The grade chosen must take into account the decrease in the ultimate tensile strength based on the operation temperature.

Another important characteristic of this product is its good weldability, given the processes used in manufacturing of boilers and pressure vessels (coated electrodes, submerged arc, and flux-cored wire).

Depending on the steel grade and the additional requirements for such grade, they may be produced through conventional rolling and normalizing or quenching and tempering thermal treatments.

Structural Steel

USI CIVIL (2008) / ASTM-A36 (2008) / ASTM-A283 (2003) / ASTM-A-284-90 / ASTM-A514 (2005) (3) / ASTM-A572 (2007) / ASTM-A573 (2005) / CSA-G40-21-04 / EN-10025-2-S235 (4) / EN-10025-2-S275 (4) / EM-10025-2-S355 / EM-10025-4-S355 (4) (8) / EN-10025-4-S420 (4) / EN-10025-4-S460 (4) / IRAM IAS 500-42 (2003) / JIS-G-3101 (2004)

These are carbon-manganese steel or microalloyed steel of low, medium, and high mechanical strength produced through conventional rolling, controlled rolling, or controlled rolling + accelerated cooling (thermo-mechanical controlled processing (TMCP)). It is used in structural components of bridges, buildings, sheds, wind turbines, agricultural machines, and road equipment.

The products of the civil construction line (USI series) are available at grades of medium and high mechanical strength, providing, in addition to good weldability, better shaping and toughness characteristics.

High-Resistance Weldable Structural Steel

USI-AR / SINCRON WHS

This grade of structural steel involves ultra-high-mechanical strength materials with guaranteed toughness at low temperatures and outperformance during welding. It is produced through controlled rolling, controlled rolling + accelerated cooling (TMCP), Normalizing, or Quenching and Tempering.

It is characterized by the low carbon equivalent content, which provides an excellent weldability to this grade.

Due to its characteristics, high-resistant weldable structural steel is indicated for applications where strict safety and greater structure lightness are desired. It is applied in bridges, viaducts, earthwork equipment, hoists, wagons, off-road trucks, wind turbines, industrial equipment, among others.

For this application, we recommend the product line Sincron, which, due to the even lower carbon equivalent content, provides excellent toughness in the Heat-Affected Zone (HAZ), even with high rates of disposal (high heat input).
 

Steel for Road Equipment and Agricultural Implements and Tractors

USI-LIN / NBR 6656-LINE

Medium- to high-resistant structural steel characterized by an outperformance as to the shapeability, weldability, and resistance to cyclic stress (fatigue).

Special manufacturing conditions provide this steel with high performance in the shaping processes, meeting the folding requirements in the cross-sectional direction at 180°, in bending radius up to the “OE” (E = plate thickness). This steel is specified under several standards, being NBR 6656 and USI LN the most frequently applied standards.

It is especially applied in side rails, crossmembers, agricultural machine chassis and axles, tractors, and road equipment.

 

Wear-Resistant Steel

USI AR

It is a type of steel with addition of quenched alloy elements, having as its main characteristic high hardness, intended for high-wear mechanical services.

In this grade, there are materials with Brinell hardness in the range of 360 to 550. This steel also provides good weldability and, in special cases, upon request, it may have a warranty supplied through a Charpy impact test at -20°C or less.

It is applied to tractors, backhoe loaders, dumpsters of off-road trucks, hoppers, gutter coverings, ore conveyers, parts of blast furnaces, and industrial fans.

Açobril keeps a stock for prompt delivery under the USI AR 450 specifications.

Source: USIMINAS Catalog

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