Alloy steel plates suppliers when your project operates under heat, pressure, or aggressive service, alloy steel plates protect performance and safety. Finding the right supplier is not just about price — it is about reliability, certification, and technical clarity. This guide explains what to expect from a dependable alloy plate supplier, which grades to specify, and how Namco Industries supports you from RFQ to dispatch.
What are alloy steel plates
Alloy steel plates are carbon steels refined with controlled additions of chromium, molybdenum, nickel, and vanadium to enhance mechanical and thermal properties. They maintain strength at elevated temperature, resist oxidation, and perform where mild steel cannot.
These plates are widely used for pressure vessels, boilers, reactors, heat exchangers, process equipment, and heavy fabrication in oil and gas, power, and chemical industries.
Key advantages of quality alloy steel plates
-
Strength at temperature – Retains mechanical integrity during hot service.
-
Better oxidation resistance – Chromium and molybdenum resist scaling and corrosion.
-
Higher fatigue life – Reduced cracking under cyclic loading.
-
Improved toughness – Safer operation in dynamic and high-stress environments.
-
Optimized weight – Higher strength allows thinner designs and lower fabrication cost.
-
Custom heat treatment – Normalized and tempered or quenched and tempered conditions available for better performance.
Common grades and standards alloy steel plates
When requesting a quote, specify the standard, grade, and delivery condition.
-
ASTM A387 Grade 11 / Grade 22 – Chrome moly alloy steel for high temperature and pressure.
-
IS 2002 – Boiler quality plates for Indian projects.
-
EN 10028-2 / EN 10028-3 – European equivalents for pressure vessels.
-
ASTM A204 Grade A / B – Alloy plate for refinery and petrochemical service.
These grades are supplied in normalized and tempered (N&T) or quenched and tempered (Q&T) condition to ensure consistent performance.
For a detailed overview, visit Alloy Steel Plates at Namco Industries.
Industries that rely on alloy steel plates
-
Oil and Gas: Pressure vessels, separators, reactors, and skids.
-
Power Generation: Boiler drums, headers, heat exchangers, and steam lines.
-
Petrochemical Plants: Columns, reactors, and storage tanks under temperature and pressure.
-
Refineries: Process piping supports and pressure-retaining components.
-
Heavy Engineering: Structural members where toughness and strength are key.
What dependable suppliers deliver
Strong alloy steel suppliers provide more than metal. Expect:
-
Chemistry control and certification for every heat.
-
Tight thickness and flatness tolerances to avoid rework.
-
Clear traceability from melt to dispatch.
-
EN 10204 Type 3.1 Mill Test Certificates with full chemical and mechanical properties.
-
Optional NDT testing – Ultrasonic, impact, HIC, SSC as required.
-
Shot blasted and primed plates for faster fabrication.
-
Third-party inspection support from approved agencies.
Fabrication and welding alloy steel plates
-
Preheat thick or restrained joints as per your welding procedure.
-
Control interpass temperature to prevent cracking.
-
Use filler metals compatible with base grade.
-
Plan post-weld heat treatment for pressure components.
-
Maintain clean, dry plates to ensure high-quality welds.
Frequently asked questions
What is the difference between alloy and mild steel plates?
Alloy steel contains added elements like chromium and molybdenum for strength and heat resistance, while mild steel has lower carbon and is used for general fabrication.
Can alloy steel be welded easily?
Yes, with correct preheat, interpass, and post-weld heat treatment procedures.
Do you supply pressure vessel quality plates?
Yes. Namco Industries supplies ASTM A387 and IS 2002 plates suitable for boilers and pressure vessels with all required test certificates.
Why choose Namco Industries alloy steel plates
Namco Industries is among India’s trusted Alloy Steel Plates Suppliers, delivering precision-rolled plates backed by reliable documentation and testing. Every order includes mill test certificates, accurate dimensions, and on-time delivery. Our plants are ISO 9001 certified, and we align supply with fabrication schedules across industries.
Conclusion
Alloy steel plates are the smart choice for high temperature, pressure, or corrosive service. Choose a supplier who provides certified quality, tight tolerances, and clear documents. Ready to check grades and lead times?
Click Here to share your requirement and receive a precise RFQ from Namco Industries today.
