ASTM A516 Grade 70 | IBR Approved Boiler Steel Grades
Introduction
Boiler Quality (BQ) Plates are carbon steel plates specifically manufactured for use in pressure vessels, boilers, and pressure-retaining equipment. These plates are designed to offer good strength, toughness, weldability, and reliability under moderate temperature and pressure conditions.
At Sharoff Steel Suppliers, boiler quality plates are supplied in ASTM and IBR-approved grades, supporting boiler manufacturers, EPC contractors, and inspection-driven projects across India.
Boiler quality plates are fine-grain carbon steels intended for welded pressure vessels and boilers. They are produced with controlled chemistry and mechanical properties to ensure:
• Good weldability
• Resistance to brittle fracture
• Stable performance under pressure
• Compliance with inspection code
They form baseline material for boiler construction before moving to alloy grades.
Overview
ASTM A516 Grade 70 is most widely used boiler and pressure vessel plate globally. It is specified where moderate temperature service and high toughness are required.
Key Characteristics
• Fine-grain carbon steel
• Good notch toughness
• Excellent weldability
• Suitable for thick pressure vessel plates
| Element | Typical % |
|---|---|
| Carbon (C) | ≤ 0.28 |
| Manganese (Mn) | 0.85 – 1.20 |
| Silicon (Si) | 0.13 – 0.45 |
Exact limits depend on thickness and specification.
For boilers manufactured and operated in India, materials must comply with Indian Boiler Regulations (IBR).
Common IBR-approved boiler plate grades include:
• IS 2002 Grade 1 / Grade 2
• ASTM A516 Gr 70 (IBR approved)
• SA 516 Gr 70 (with IBR endorsement)
IBR approval is application-specific and depends on documentation, inspection, and certification — not just chemistry.
• Designed for moderate temperature pressure service
• Good ductility and toughness
• Suitable for thick welded sections
• Compatible with Post Weld Heat Treatment (PWHT) where required
Boilers & Pressure Equipment
• Steam drums
• Headers
• Economisers
Pressure Vessels
• Separators
• Storage vessels
• Process vessels
Industrial Equipment
• Heat exchanger shells
• Pressure-retaining components
Boiler quality plates are typically supplied in:
• As-rolled or
• Normalized condition (project dependent)
Fabrication considerations:
• Preheating based on thickness
• PWHT as per code and thickness
• Approved welding consumables
• Compliance with IBR / ASME welding procedures
Sharoff Steel Suppliers supplies boiler quality plates in:
• Plates
• Cut-to-size segments
• Thicknesses suitable for boiler fabrication
All supplies are backed by:
• Mill Test Certificates (MTCs)
• IBR documentation (where applicable)
• Heat number traceability
Before ordering boiler quality plates, confirm:
• ✅ Grade (A516 Gr 70 / IS 2002)
• ✅ IBR applicability
• ✅ Plate thickness & size
• ✅ Delivery condition
• ✅ Inspection authority requirement
• ✅ MTC and traceability
Correct specification avoids inspection delays and project rejections.
• Experience supplying IBR and ASME boiler steels
• Understanding of inspection and documentation flow
• Reliable sourcing and traceability
• Guidance on when to upgrade to 16Mo3 or SA 387
• Ability to supply plates, APH pipes, and boiler steels together
We support customers whereinspection approval and safety are non-negotiable.
Is ASTM A516 Gr 70 IBR approved?
Yes, when supplied with IBR certification and inspection as per project requirement.
When should A516 Gr 70 be avoided?
When operating temperatures exceed its design limits, alloy steels should be used.
Is normalization mandatory for boiler plates?
Normalization depends on thickness, code requirement, and service conditions.
Boiler Quality Plates such as ASTM A516 Grade 70 and IBR-approved grades form the foundation of boiler and pressure vessel fabrication. Correct grade selection, documentation, and inspection compliance are essential for safe operation.
At Sharoff Steel Suppliers, boiler quality plates are supplied with code clarity, inspection awareness, and dependable sourcing.