Stainless Steel:

Stainless Steel Sheets and Plates are Durable, Corrosion-Resistant and High-Strength Metal products composed of Iron, Chromium and Elements like Nickel. Sheets are thinner (<6mm) versatile materials used in appliances and cladding while Plates (≥6mm) are thicker and used for structural support. Key Grades include 304, 316 and 410 providing High Tensile Strength and Longevity in for example Construction and Chemical Industries.

Key Characteristics & Properties:

Corrosion Resistance: The high Chromium content forms a protective oxide layer that shields against Rust, Chemical Exposure and Heat.

Durability & Strength: These Materials have High Tensile Strength and Ductility.

Hygienic: Easy to Clean and Resistant to Corrosion from Food Acids making them ideal for Food and Medical Industries.

Versatility: Easy to form Weld and Fabricate into various shapes. 

Difference between Sheets and Plates:

Stainless Steel Sheets: Generally defined as having a Thickness less than 6 mm. They are flexible used for lighter applications like Cutlery, Kitchen Sinks and Automotive parts.

Stainless Steel Plates: Generally thicker starting from 6 mm or more. They are used for heavy-duty applications requiring high durability such as Industrial Construction, Shipbuilding and Pressure Vessels. 

Common Grades:

Grade 304: The most common Grade featuring 18% Chromium and 8% Nickel (18/8).

Grade 304L: A Low-Carbon version of 304 enhancing Weld Ability.

Grade 316: Known for better Corrosion Resistance often used in Marine and High-Chloride Environments.

Grade 410/430: Ferritic/Martensitic Grades often used when Magnetic Properties or Lower Costs are required. 

Applications:

Construction: Structural Components, Roofing and Cladding.

Automotive: Frames, Exhaust Systems and Trim.

Industrial: Chemical Processing Tanks, Food Processing Equipment and Pharmaceutical Machinery.

Appliances: Household Items, Refrigerators and Sinks. 

Surface Finishes:

Stainless Steel Sheets and Plates come in various finishes to meet Aesthetic and Functional needs including No. 1 (hot-rolled), Dull Polished and Shiny Finishes. 

 Nickel & Nickel Alloy:

Nickel and Nickel Alloy Steel Plates are high-performance Materials (1%–50%+ Nickel) designed for extreme Corrosion Resistance, High Temperatures and Cryogenic Applications. Key Plate Grades include pure Nickel 200/201, Inconel 625/718 (High-Strength), Monel 400 (Marine) and Hastelloy C-276 (Chemical) commonly manufactured to ASTM B162, B443 and B168 Standards. 

Top Nickel & Nickel Alloy Plate Grades:

• Commercially Pure Nickel:Nickel 200 (UNS N02200) and Nickel 201 (UNS N02201 – Low Carbon) are used for Food Processing and Caustic Environments.
• Inconel Alloys (Nickel-Chromium):
  • Inconel 600/601:Excellent Heat/Oxidation Resistance.
  • Inconel 625 (UNS N06625):High Strength and Corrosion Resistance for Aerospace and Marine.
  • Inconel 718 (UNS N07718):Precipitation-Hardenable for High-Temperature Strength.
• Monel Alloys (Nickel-Copper):
  • Monel 400 (UNS N04400):High Strength in Marine and Hydrofluoric Acid applications.
• Hastelloy & Corrosion Resistant Alloys:
  • Hastelloy C-276 (UNS N10276):Superior Resistance to Harsh Chemical Environments.
  • Alloy 20 (UNS N08020):Specialized for Sulphuric Acid Environments.
• High-Temperature Alloys:
  • Incoloy 800H (UNS N08810):Outstanding High-Temperature Strength.

Common Standards and Specifications:

• Nickel 200/201:ASTM B162
• Nickel-Copper (Monel):ASTM B127
• Nickel-Chromium (Inconel):ASTM B168 / ASTM B443
• Nickel-Iron-Chromium:ASTM B409 

Key Properties

• Corrosion Resistance:Highly Resistant to Acidic, Alkaline and Seawater Environments.
• Temperature Stability:Retains Strength at Extreme Temperatures (Cryogenic to >900∘C).
• Fabrication:Excellent Weldability and Formability for Pressure Vessels and Petrochemical Equipment. 

Mild Steel:

Mild Steel Plates are Low-Carbon Versatile Structural Steels commonly used in Construction and Fabrication with typical Thicknesses ranging from 3mm to 150mm. Major Grades include ASTM A36 (General Use), EN 10025 S235/S275/S355 (European Standards) and IS 2062 E250/E350 (India) offering varied Strength, Ductility and Weldability. 

Key Mild Steel Plate Grades & Standards:

• ASTM A36:The most common Mild Steel Plate for general Structural purposes providing good Weldability and Machinability.
• EN 10025 Standard (European):
  • S235JR:Excellent for General Light Structural applications and Fabrication.
  • S275JR:A common Structural Grade offering Higher Tensile Strength than S235.
  • S355JR/J2:A Higher-Strength Mild Steel for Heavy Structural Applications, Machinery and Bridges.
• IS 2062 (Indian Standards):
  • E250:Suitable for General Structural Purposes.
  • E350 & E450:High-Strength Grades for more demanding Structural applications.

Common Characteristics:

• Strength:Yield Strengths commonly Range from 235MPa to 355MPa.
• Quality:Often supplied in “Killed” Quality (Si-Al Killed) for improved consistency.
• Suffixes (e.g., JR, J0):Indicate the Charpy V-Notch Impact toughness requirements. 

Typical Applications

• Structural Engineering (Beams, Bridges).
• General Fabrication and Machining.
• Shipping Containers and Ship Building.
• Machinery and Heavy Vehicle Parts.

 Carbon Steel:

Carbon Steel Plate Grades are classified by Carbon Content (Low, Medium, High) and applications with ASTM A36 being the most common Structural Grade. Key Grades include High-Strength A572 (Grade 50/60), Pressure Vessel Quality A516 (Grade 70) and Atmospheric Corrosion-Resistant A588 (Corten). Plates Range from 3/16″ to 6″ in Thickness for Diverse Structural, Bridge and Pressure-Vessel uses. 

Common Carbon Steel Plate Grades:

• ASTM A36:The Industry Standard for General Structural applications. It is Low-Carbon, Highly Weldable and Ductile.
• ASTM A572 (Grade 50):A High-Strength Low-Alloy (HSLA) Steel with a 50 ksi Yield Point used when higher strength than A36 is required.
• ASTM A516 (Grade 70):Designed for Pressure Vessels and Boilers offering excellent toughness at Lower Temperatures.
• ASTM A588 (Corten):A Weather-Resistant Structural Steel containing Copper often used in Bridges and Exposed Structures for Corrosion Resistance.
• ASTM A283 (Grade C):A General-Purpose Carbon Steel suitable for Structural applications requiring Moderate Strength and Good Formability.
• ASTM A537 (Class 1/2):Heat-Treated Carbon Steel Plates designed for Pressure Vessels with enhanced Strength and Toughness.
• 1045 Carbon Steel:A Medium-Carbon Steel used for stronger Structural Components requiring Higher Wear Resistance.
• AR400/AR500:Abrasion-Resistant Steel Plates designed for Heavy Wear and Mining Applications. 

Classification by Carbon Content:

• Low Carbon Steel (𝟎.𝟎𝟔%–𝟎.𝟐𝟓% 𝐂):Known as Mild Steel Highly Ductile and easy to Weld (e.g., A36).
• Medium Carbon Steel (𝟎.𝟐𝟓%–𝟎.𝟓𝟓%𝐂):Balances Strength and Ductility good for Heavy Machinery (e.g., A516, 1045).
• High Carbon Steel (𝟎.𝟓𝟓%–𝟏.𝟓%𝐂):Used for hardened applications requiring High Wear Resistance. 

Key Selection Factors:

• Structural Strength:A572 and A588 offer Higher Yields than A36.
• Pressure/Temp:A516 is specifically designed for High-Pressure Service and Notch Toughness.
• Environmental:A588 provides Superior Resistance to Atmospheric Corrosion.
• Fabrication:A36 is typically the most Versatile for Cutting, Drilling and Welding.