What is ASTM A105?
ASTM A105 is the material specification for forged carbon steel piping components — flanges, fittings, valves and parts — intended for ambient and higher-temperature service in pressure systems.
Key Takeaways
- ASTM A105 scope: Chemical composition, mechanical properties, heat treatment and testing requirements for forged carbon steel. It is a material specification, not a dimensional one, so it is always ordered alongside a dimensional standard such as ASME B16.5.
- Size range: Any size the dimensional standard covers — NPS 1/2 inch to 24 inch under B16.5, larger under B16.47.
- Ratings: Governed by the dimensional standard; A105 falls in ASME B16.5 material group 1.1.
- Material grades: Carbon steel with 0.35 per cent maximum carbon, minimum 70 ksi tensile and 36 ksi yield.
- Kalp Alloys manufactures to ASTM A105 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 A105 governs
ASTM A105 is the material specification for forged carbon steel piping components — flanges, fittings, valves and parts — intended for ambient and higher-temperature service in pressure systems.
Chemical composition, mechanical properties, heat treatment and testing requirements for forged carbon steel. It is a material specification, not a dimensional one, so it is always ordered alongside a dimensional standard such as ASME B16.5.
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 — NPS 1/2 inch to 24 inch under B16.5, larger under B16.47 |
| Ratings | Governed by the dimensional standard; A105 falls in ASME B16.5 material group 1.1 |
| Material grades | Carbon steel with 0.35 per cent maximum carbon, minimum 70 ksi tensile and 36 ksi yield |
| Specification type | Material — pair with ASME B16.5 or B16.47 for dimensions |
| Maximum carbon | 0.35 per cent |
| Minimum tensile strength | 70 ksi (485 MPa) |
| Minimum yield strength | 36 ksi (250 MPa) |
| ASME B16.5 material group | Group 1.1 |
| Normalised variant | A105N — required by many refinery specifications |
| Low-temperature equivalent | ASTM A350 LF2 with Charpy impact testing |
The point buyers most often get wrong
A105 and A105N are frequently written as if interchangeable. The N suffix denotes the normalised condition, which is required where the component will see impact-tested or elevated-temperature service and is specified by many refinery standards as a default. If the specification says A105N, supplying A105 in the as-forged condition is a non-conformance even though the chemistry is identical. For low-temperature service the correct specification is not A105 at all but ASTM A350 LF2, which carries mandatory Charpy impact testing.
What Kalp Alloys manufactures to ASTM A105
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 A105 cover Carbon steel with 0.35 per cent maximum carbon, minimum 70 ksi tensile and 36 ksi yield. Non-standard bores, thicknesses, drilling patterns and facing finishes are produced to customer drawing.
Ordering against ASTM A105
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 A105 is the material specification for forged carbon steel piping components — flanges, fittings, valves and parts — intended for ambient and higher-temperature service in pressure systems.
Any size the dimensional standard covers — NPS 1/2 inch to 24 inch under B16.5, larger under B16.47. Ratings covered are Governed by the dimensional standard; A105 falls in ASME B16.5 material group 1.1.
Carbon steel with 0.35 per cent maximum carbon, minimum 70 ksi tensile and 36 ksi yield.
The chemistry is the same; the N denotes the normalised heat treatment condition. Many refinery and pressure-vessel specifications require A105N, and supplying as-forged A105 against an A105N line item is a non-conformance.
No. For low-temperature or cryogenic duty the correct specification is ASTM A350 LF2, which mandates Charpy V-notch impact testing at the specified temperature. A105 carries no such requirement.
Yes. Kalp Alloys manufactures to ASTM A105 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.