Navgraha Steels INC supplies alloy and chrome-moly steel plates for pressure equipment, boilers, refinery units, reactors, heat exchangers and power-sector fabrication where an approved specification requires alloy steel for elevated-temperature service. The category includes SA 387 Grade 11 Class 2, Grade 22 Class 2, Grade 91 Class 2, Grade 12 Class 2 and 16Mo3.
These grades are not interchangeable. For a technical and commercial offer, send the complete specification, grade and class, plate dimensions, quantity, required heat treatment, impact or ultrasonic testing, welding/PWHT constraints, certificate type, approved mill and delivery destination.
SA 387 Grade 11 Class 2 is a chromium-molybdenum alloy pressure-vessel steel used for approved elevated-temperature boilers, vessels, refinery equipment and heat exchangers. The purchase order must identify Class 2 and the required heat-treatment condition; Class 1 should not be supplied as an unapproved substitute.
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SA 387 Grade 22 Class 2 contains a different chromium-molybdenum alloy system from Grade 11 and is specified for particular elevated-temperature pressure-equipment duties. Selection should follow the vessel design, temperature, fabrication and code requirements.
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SA 387 Grade 91 Class 2 is a creep-strength-enhanced alloy steel for demanding high-temperature equipment. Material identity, heat treatment, welding consumables, preheat, interpass control and post-weld heat treatment require strict project and fabrication control. It must not be treated as ordinary chrome-moly plate.
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SA 387 Grade 12 Class 2 is a chromium-molybdenum pressure-vessel steel for specified elevated-temperature applications. The applicable class, condition, thickness-dependent properties and supplementary requirements should be confirmed in the RFQ.
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16Mo3 is a molybdenum-alloy pressure-equipment steel covered by the applicable EN specification and used for approved boilers, pressure vessels, heat exchangers and power equipment. It is not an automatic equivalent of SA 387 Grade 11 or another ASME grade; substitution requires engineering, code and client approval.
READ MORE| Procurement question | Why it matters |
|---|---|
| Which design code and material specification apply? | Determines whether an ASME/ASTM or EN grade is acceptable |
| What is the exact grade and class? | SA 387 grades and Class 1/Class 2 requirements have different specified properties |
| What are the design and operating temperatures? | Material selection and long-term elevated-temperature behaviour are service-specific |
| What heat-treatment condition is required? | Normalising, tempering, quenching and tempering or another condition may be mandatory for the grade and thickness |
| Is impact or ultrasonic testing required? | Test temperature, orientation, examination method and acceptance level affect sourcing |
| What welding and PWHT rules apply? | Chrome-moly grades require grade-specific fabrication procedures and controls |
| Is the mill or origin restricted? | EPC and end-user approved-vendor requirements can limit sourcing options |
| Which certificate and inspection package is needed? | EN 10204 type, ITP, third-party witnessing and code documents influence price and lead time |
| Buying requirement | Supply options and limitations |
|---|---|
| Plates | Standard mill plates, full plates or processed plates according to grade, class, thickness and source availability |
| Sheets | Reviewed only where the required grade, specification, thickness and manufacturing route support sheet supply |
| Coils | Reviewed where the grade, gauge, width, condition and commercial quantity support coil production or sourcing |
| Heat treatment | Supplied only in the condition required by the specification and supported by the material documents |
| Processing | Cutting, profiling, bevel or edge preparation, marking and packing where technically feasible |
| Traceability | Heat-number and material-identity control according to the agreed processing and inspection procedure |
| Quantity | Individual plates, shutdown requirements, repeat orders and project quantities subject to stock or mill availability |
Alloy and chrome-moly plates may be specified for:
The application list is indicative, not a performance guarantee. Selection and fabrication should address:
Related links: Pressure Vessel Steel | Boiler Quality Steel | Nickel Alloy & Exotic Plates
Navgraha Steels INC handles alloy and chrome-moly plate enquiries through available stock, domestic sourcing, international mill sourcing and imports. The sourcing route depends on grade, class, plate size, heat-treatment condition, approved origin, certificate package, quantity and project schedule.
Commercial capabilities include:
Chrome-moly procurement requires careful verification of grade, class, heat treatment and traceability. The document package must be defined before quotation and reviewed before fabrication.
Depending on the material, manufacturer and agreed order scope, supply may include:
Price varies by grade and class, plate thickness and dimensions, quantity, mill and origin, heat treatment, impact/UT requirements, certificate type, inspection, processing, packing and destination.
Send the following for an accurate quotation:
Navgraha Steels INC accepts enquiries across India and from export buyers. Export scope can include agreed product marking, seaworthy packing, inspection records, commercial and shipping documents and logistics coordination. Freight, insurance, taxes, duties, offer validity and delivery schedule are stated in the commercial offer.
Upload the RFQ, material requisition, plate schedule or project specification. Our team will review the grade, class, condition, dimensions, tests, documents, mill restrictions and delivery requirement before providing an applicable offer.
Request Chrome-Moly Plate Quote