Stockists of ASTM A573 Grade 70 Plates in Vadodara, ASTM A573 GR. 70 Hot Rolled Plates Plate Supplier in Cochin, ASTM A573 Grade 70 Cold Rolled Plate Suppliers in Gujarat, India.

ASTM A573 Grade 70 plate is a structural carbon steel plate covered under ASTM A573, a standard for improved toughness in structural carbon steel used in moderate-temperature service. Grade 70 is the highest strength level within this standard, offering a minimum yield strength of 290 MPa (42 ksi) and a tensile strength range of 485–620 MPa (70–90 ksi).

The controlled carbon and manganese content gives this grade a reliable combination of weldability, machinability, and notch toughness properties that standard structural plates like A36 do not consistently deliver. ASTM A573 Gr. 70 is primarily used in structural applications and moderate-pressure fabrications such as storage tanks, bridges, frames, and industrial equipment.

It is not a pressure vessel plate; ASTM A516 Grade 70 serves that role, but for cost-sensitive structural projects requiring better toughness than A36, this grade is a practical and economical choice. Typical supply conditions are as-rolled; normalised supply is available where specified.

Plates are produced across a thickness range of 6 mm to 100 mm (0.24" to 3.94") with widths up to 3,000 mm. We stock and supply ASTM A573 Grade 70 plates from Mumbai with ready inventory, custom cutting services, and pan-India delivery capability. This page covers specifications, chemical composition, mechanical properties, equivalent grades, applications, and supply details.

What is ASTM A573 Grade 70 Plate?

ASTM A573 Grade 70 is a structural carbon steel plate designed for improved toughness compared to standard structural grades. ASTM A573 covers 3 strength levels Grade 58, Grade 65, and Grade 70, with Grade 70 being the highest.

Controlled composition and a Charpy V-notch impact test requirement that A36 does not require improve toughness. Grade 70 is better for low-temperature or impact-loaded applications that require brittle fracture.

Good machinability and weldability without complex preheating procedures make it a cost-effective alternative to dedicated pressure vessel plates, particularly for non-pressure structural fabrications.

ASME SA573 GR. 70 Plate Distributors, ASTM A573 Grade 70 HSLA Structural Steel Plate Supplier in Ahmedabad, ASTM A573 Gr 70 Boiler Quality Plate, Hot Rolled Steel ASTM A573 Gr 70 Plates Supplier in Anand, High-Strength Low-Alloy Columbium-Vanadium Structural Steel ASTM A573 Gr 70 Plates Stockholders in Gujarat.

ASTM A573 Gr. 70 Plate Specifications

The table below lists the dimensional range and compliance details for ASTM A573 Grade 70 plate as commonly supplied.

Thickness Range 6 mm – 100 mm (0.24" – 3.94")
Width Up to 3,000 mm (up to 118")
Length Up to 12,000 mm (up to 472")
Supply Condition As-rolled (AR); normalised available on request
Surface Finish As-rolled mill surface, descaled on request
Standard ASTM A573 / ASME SA-573

ASTM A573 Grade 70 Chemical Composition :

The composition limits below apply to ASTM A573 Grade 70 plate as per the standard. All values are maximum unless stated otherwise.

Element Symbol Limit (wt%)
Carbon C 0.28 max
Manganese Mn 0.85–1.20
Phosphorus P 0.035 max
Sulfur S 0.040 max
Silicon Si 0.15–0.40

Mechanical Properties :

The table below lists the required mechanical properties for ASTM A573 Grade 70 plate in the as-rolled or normalised supply condition.

Property Value (Metric) Value (Imperial)
Yield Strength (min) 290 MPa 42 ksi
Tensile Strength 485–620 MPa 70–90 ksi
Elongation in 200 mm (min) 21% 21%
Elongation in 50 mm (min) 17% 17%

Charpy V-notch impact testing is required for plates above 12.5 mm (0.5") thickness when specified by the purchaser. This is a key differentiator from ASTM A36, which has no standard impact test requirement.

ASTM A573 Grade 70 Equivalent Grades

The table below lists common equivalent and comparable grades across standards. These are approximate comparisons always verify suitability for the specific application.

Standard Grade Notes
ASTM A36 Lower yield strength (250 MPa / 36 ksi); no toughness requirement. A573 Gr. 70 offers better notch toughness.
ASTM A516 Grade 70 Pressure vessel plate; mandates normalising above 40 mm. Different application scope not interchangeable.
EN 10025-2 S355J2 Closest EN structural equivalent in yield strength and toughness class; normalised delivery.
EN 10025-2 S275JR Lower strength; comparable to A573 Gr. 65 rather than Gr. 70.

Applications of ASTM A573 Grade 70 Plates

ASTM A573 Grade 70 plates are high-strength carbon steel materials essential for demanding structural and industrial engineering projects.

Structural Components

These plates are used in building frames and support beams to provide stability and load-bearing strength for large structures.

Storage Tanks

Frequently used in the fabrication of liquid and gas storage vessels, guaranteeing safety and resilience under sustained internal pressure and load.

Bridges

Ideal for bridge decking and girders, these plates offer the structural integrity needed to withstand heavy traffic and environmental stress.

Industrial Equipment

Manufacturers use these plates for heavy-duty machinery bases and frames that require high tensile strength and long-term wear resistance.

Construction & Fabrication

Used in general steel fabrication and site work, these plates allow for reliable welding and shaping of custom industrial steel parts.

Advantages / Key Features

Several advantages of our ASTM A573 Grade 70 Plates improve project efficiency and structural reliability:

  • High Strength-to-Cost Ratio: Delivers a 290 MPa yield strength at a significantly lower cost than many alloy structural grades.
  • Excellent Weldability: Controlled carbon content maintains a low carbon equivalent. This choice effectively lowers preheating requirements during your on-site manufacture.
  • Superior Toughness: Provides better impact resistance than standard A36 plates, with optional Charpy impact testing available for critical safety.
  • Easy Fabrication: These plates are rolled up, organised in a machine, and respond very well to flame cutting, bending, and other specialised shaping methods.

Difference: A573 Gr 70 vs A516 Gr 70

Both grades share the same '70' strength designation but serve different applications. Knowing the difference matters before specifying.

Parameter A573 Grade 70 A516 Grade 70
Application Structural, moderate service Pressure vessels, boilers
Normalising As-rolled standard; normalised optional Mandatory above 40 mm (1.5 in)
Impact Testing Optional / purchaser-specified Required for certain thicknesses and services
Carbon content 0.28% max 0.27% max (varies with thickness)
Cost Generally lower Slightly higher due to processing requirements
Interchangeable? No different application scope No different application scope

Using A516 Grade 70 for structural non-pressure applications is unnecessarily costly. Using A573 Grade 70 in pressure vessel service is non-compliant. Specify the right grade for the right service from the outset.

Why Choose Us?

As a licensed stockist and supplier in Mumbai, we keep a complete stock of ASTM A573 Grade 70 plates in all standard thicknesses to meet your urgent project needs. Our facility offers sophisticated bespoke cutting and profiling capabilities, including precision plasma, flame, and waterjet cutting, ensuring that your materials are delivered to precise specifications.

Our team ensures prompt delivery throughout India, offering dependable logistical support directly to your project locations. We provide complete paperwork and mill test certifications for every transaction to ensure traceability and quality. Trust our expertise to deliver superior structural steel solutions for your industrial needs. Expect constant supply. We prioritise your schedule to finish the assignment quickly.