On January 6, 2025, we received an inquiry from an old customer in Canada. The inquiry product was Carbon Steel ASTM A105 Flange Ring, one 30-inch and one 40-inch, material of A105.

Forged pre machine ring, A105N Material OD=40″, ID=30″, THK=5″

Forged pre machine blind circle, A105N material, OD=40″ THK=3.5″

We quoted the customer and confirmed the flange ring drawing, and soon received the customer’s purchase order. The customer has very high quality requirements and requires non-destructive testing and impact testing of the flange ring. After the goods are completed, we provide the customer with inspection photos.

This is the first time we have cooperated with this customer for flange orders. ZIZI Engineering is a leading of Carbon Steel ASTM A105 Flange Ring supplier and exporter.

What is forged flange ring?

A forged flange ring is a circular metal component used to connect pipes, valves, or other equipment in a piping system. These rings are manufactured through forging, a process that enhances their strength, durability, and resistance to pressure and temperature variations.

Key Features of Forged Flange Rings

High Strength – Forging increases the density and mechanical properties of the metal.
Corrosion & Heat Resistance – Available in stainless steel, carbon steel, alloy steel, and other materials for various environments.
Leak-Proof Connection – Provides a secure seal for pipelines and industrial systems.
Customizable Sizes & Standards – Manufactured as per ANSI, ASME, DIN, API, and other standards.

ASTM A105 Material Analysis

ASTM A105:

This is a standard specification from the American Society for Testing and Materials (ASTM) that covers forged carbon steel piping components, including flanges, fittings, and valves.

A105N:

The “N” in A105N signifies that the material has undergone a normalization process, which involves controlled heating and cooling to refine the steel’s grain structure and improve its mechanical properties, such as toughness and impact resistance.

ASTM A105 Material Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Cu	Ni	Cr	Mo	V
ASTM A105	MIN		0.60			0.10
	MAX	0.35	1.05	0.035	0.040	0.35	0.40	0.40	0.30	0.12	0.08
ASTM A105N	MIN		0.600
	MAX	0.350	1.050	0.040	0.050		0.400		0.300	0.120	0.080

 

ASTM A105 Material Mechanical Property

 

MATERIAL	T.S (MPA)	Y.S (MPA)	EL %	R/A %	HARDNESS
ASTM A105	485 min	250 min	22 min	30 min	197 max
ASTM A105N	485min	250 min	22 min	30 min	197 max

Comparison: ASTM A105 vs. ASTM A105N

Property	A105 (As Forged)	A105N (Normalized)
Heat Treatment	Not required	Normalized at 900-950°C
Toughness & Ductility	Lower	Higher
Suitability for Low-Temperature	Not recommended	Recommended
Impact Testing	Not required	May be required (-29°C / -20°F)
Applications	General use	Critical applications, low-temp service

How to inspect ASTM A105N flange ring

✅ Visual Inspection (VT)

Ensures surface smoothness, no cracks, dents, or rough forging defects.

Uses calipers, micrometers, and gauges to check tolerances.

✅ Dimensional Inspection

Ensures flanges, fittings, and forged parts meet required thickness, diameter, and bore size.

Applications of Forged Flange Rings

Oil & Gas Pipelines – High-pressure and high-temperature applications.

Petrochemical & Chemical Plants – Corrosion-resistant connections.

Water Treatment Plants – Leak-proof joining of water transport systems.

Power Generation – Boiler and steam piping systems.

Shipbuilding & Marine – Heavy-duty flange connections.