Steel Plates

Steel Plates

Often used for structural applications, bridge and building work and heavy equipment manufacturing, steel plates are measured differently from other steel products. Rather than having standard gauges, similar to sheets and pipes, it is measured strictly in inches. It is available in a variety of formats that include:

API/EN High Tensile

These are typically used in the offshore sector with plates for line pipe as well as structural applications an option. The applicable codes and standards for this type of steel plates are noted as API 2W with Grade 60 typically in use. This is a low sulfur metal that are typically cold formed for strength and durability. Sour service is a wise idea and will ensure resistance to sulfide stress corrosion cracking.

Hot Rolled Coils

Typically created to ASTM A36 or AISI 1008/1010 standards, and most often galvanized to provide increased corrosion resistance, it is commonly applied in line pipe fabrication. Thicknesses range from 3/16 to 1 1/2 inches.

Roll-Bonded Clad & Alloy Steel Plates

Conforming to ASTM A263 / ASME SA-263 / ASTM A264 / ASME SA-264 standards, these use two or more metals for specific purposes. Typically it is a stainless steel and a low alloy backer to prevent corrosion but control costs. Using hot rolling to bond the materials, the base metal must conform to specific standards as well as the clad steel or metal. Base metal standards will conform to:

Pressure vessel use carbon steel plate A516, A285, SA-516, SA-285

Pressure vessel use low-alloy steel plate A387, SA-387, P235GH etc

Structural carbon steel plate A36, A283, S235JR, S235JR, P355 NH, P355 NH1

Other standards in available steel plates, such as, BS, JIS, ASTM, ASME, various ship classification society standards are also applicable.

The clad steel will conform to ASTM or ASME standards that include:

Stainless Steel Spec: ASTM A240 : 304L, 316L, 317L, 321, 347, 405S, 410S, 430, 904L, 2205, AI6XN

Nickel Alloy Spec: B162 : Nickel 200, Nickel 201

Nickel Alloy Spec: B127 , B424, B443: Alloy  400, C276, Alloy  600/625/825/686, +C22, +Carpenter, 20

Titanium Alloys: Grade 1, Grade 2, Grade 7, Grade 11

Other standards in available steel plates, such as, BS, JIS, ASTM, ASME, various ship classification society standards are also applicable.

Quenched and Tempered Plates

Providing steel with high ductility and strength, this is a two-step heating process that hardens the plate and then quenches it with water to temper the material and create optimal properties and conditions. This results in high strength metal. Common grading includes 80, 400, and 500.

Ultra High Tensile Plates, Coils & Sheets

The goal here is to create thinner sheets with optimal strength and sheets are thermo-mechanically rolled to deliver cold-forming behaviors where this level of strength is needed. Used in heavy duty machinery and port equipment, it can be found in EN 10025-2 and EN 10149-2 specifications at thicknesses ranging from 2.5mm to 12mm.

Shipbuilding Plates and Bulb Profiles

Steel bulb flat sheets are used for shipbuilding and will be in grades A, B, A32, A36, D, D32 and D36. They will have to meet standards such as GB/994, AH32, AH36, DH32, DH36, EH32,EH36,AH40, and DH40 and come in thicknesses of 4 to 20mm.

Heads and Cones

Specialty items for refineries, oil and gas, chemical, petrochemical, transport, power plants, and energy industries, these are used in everything from storage tanks and columns to reactors and heat exchangers. Single piece units, they require thicknesses of 3,400 to 10,000mm and can be flanged or pressed. Steel plates used to make them have to be 20mm and of the P460 NL2 mod grade.

Diverse in sizing and standardization, it is important to have optimal control when buying steel plates. Gemina has all of the standard sizes and grades available and its steel plates are produced in the very best mills in Turkey, the European Union and Asia.