What is ASTM A182?
ASTM A182 is the material specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, valves and parts for high-temperature service. It is the single most-referenced material specification across our flange range.
Key Takeaways
- ASTM A182 scope: Both the ferritic chrome-moly grades used at elevated temperature and the austenitic, duplex and super duplex stainless grades used for corrosion resistance, with composition, mechanical property, heat treatment and testing requirements for each.
- Size range: Any size the dimensional standard covers.
- Ratings: Governed by the dimensional standard; material group varies by grade.
- Material grades: F5, F9, F11, F22 and F91 ferritic grades; F304, F304L, F316, F316L, F321 and F347 austenitic grades; F51 (2205), F53 (2507) and F55 duplex grades.
- Kalp Alloys manufactures to ASTM A182 in Ahmedabad, India, with EN 10204 3.1 and 3.2 certification issued in its own name.
- Third-party inspection by SGS, BV, TUV or Lloyds can be witnessed at our plant before dispatch.
What ASTM A182 governs
ASTM A182 is the material specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, valves and parts for high-temperature service. It is the single most-referenced material specification across our flange range.
Both the ferritic chrome-moly grades used at elevated temperature and the austenitic, duplex and super duplex stainless grades used for corrosion resistance, with composition, mechanical property, heat treatment and testing requirements for each.
Scope, sizes and ratings at a glance
The envelope below is the practical reference: what to state on a purchase order so the item that arrives is the item the line needs.
| Parameter | Detail |
|---|---|
| Size range | Any size the dimensional standard covers |
| Ratings | Governed by the dimensional standard; material group varies by grade |
| Material grades | F5, F9, F11, F22 and F91 ferritic grades; F304, F304L, F316, F316L, F321 and F347 austenitic grades; F51 (2205), F53 (2507) and F55 duplex grades |
| F11 / F22 | Chrome-moly ferritic — elevated-temperature refinery and steam service |
| F91 | Modified 9Cr-1Mo — high-temperature power plant headers |
| F304 / F304L | Austenitic stainless — general corrosion resistance |
| F316 / F316L | Molybdenum-bearing austenitic — improved chloride and pitting resistance |
| F321 / F347 | Stabilised austenitic — resists sensitisation at temperature |
| F51 / F53 / F55 | Duplex and super duplex — chloride and stress-corrosion service |
| L suffix | Low carbon, resists weld sensitisation |
The point buyers most often get wrong
The F-number prefix is what causes confusion, because it spans two entirely different metallurgies. F11 and F22 are chrome-moly ferritic steels chosen for creep strength at temperature; F304L and F316L are austenitic stainless steels chosen for corrosion resistance. They are not substitutes for one another in either direction. The L suffix denotes a low-carbon variant that resists sensitisation during welding, which matters wherever the component will be welded and then exposed to a corrosive medium.
What Kalp Alloys manufactures to ASTM A182
Kalp Alloys is a manufacturer, not a stockist. Production runs at our own facility at 5, Jay Vijay Industrial Estate, B/h. Akash Vikas Estate, Keval Kanta Road, Rakhial, Ahmedabad, which means the heat number stamped on the part traces to our own melt record and the mill test certificate is issued in the name of Kalp Alloys.
That matters on standard-led purchasing more than anywhere else, because an approved-vendor submission or a code-governed line has to show who made the part. A certificate passed down a trading chain names a mill the buyer has no relationship with and cannot query.
Grades supplied against ASTM A182 cover F5, F9, F11, F22 and F91 ferritic grades; F304, F304L, F316, F316L, F321 and F347 austenitic grades; F51 (2205), F53 (2507) and F55 duplex grades. Non-standard bores, thicknesses, drilling patterns and facing finishes are produced to customer drawing.
Ordering against ASTM A182
State the dimensional standard, the size or NPS range, the rating or schedule, the facing where applicable, the material specification and grade, the quantity, and the certification level required. A quotation is typically returned within 24 hours.
Drawings for non-standard items can be sent by email or on WhatsApp at +91 81608 73937 and are reviewed by the technical team. Stock sizes dispatch in three to seven days; made-to-drawing items carry a firm lead time quoted at order confirmation. There is no minimum order on stock sizes and trial quantities are accepted.
Frequently Asked Questions
ASTM A182 is the material specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, valves and parts for high-temperature service. It is the single most-referenced material specification across our flange range.
Any size the dimensional standard covers. Ratings covered are Governed by the dimensional standard; material group varies by grade.
F5, F9, F11, F22 and F91 ferritic grades; F304, F304L, F316, F316L, F321 and F347 austenitic grades; F51 (2205), F53 (2507) and F55 duplex grades.
F316L carries a lower maximum carbon content, which reduces chromium carbide precipitation at grain boundaries during welding. Where a component is welded and then exposed to a corrosive medium, F316L is the safer specification.
No. F11 is a chrome-moly ferritic steel with creep strength at temperature but limited corrosion resistance; F304 is an austenitic stainless with corrosion resistance but different high-temperature behaviour. They serve different purposes and are not interchangeable.
Yes. Kalp Alloys manufactures to ASTM A182 at its own facility at 5, Jay Vijay Industrial Estate, B/h. Akash Vikas Estate, Keval Kanta Road, Rakhial, Ahmedabad, and issues the EN 10204 3.1 or 3.2 mill test certificate in its own name rather than passing through a third-party mill certificate.
An EN 10204 3.1 mill test certificate as standard, stating the ordered standard, grade and heat number, with chemical and mechanical results and a dimensional inspection report. EN 10204 3.2 with third-party inspection by SGS, BV, TUV or Lloyds is arranged where the project requires it.