ASTM A105 Custom Flange Order

On July 8, 2025, we received an inquiry from an Italian client regarding custom ASTM A105 threaded flanges and SAE flanges. Carbon steel flanges are among our most frequently sold products. Drawing on years of experience, our sales representative provided a quotation to the client. The client found our representative highly professional and trustworthy, leading to the placement of an order. Upon receiving the order, production was immediately initiated. The client has now received the shipment.

Procurement List

ITEM	DESCRIPTION	Material	Quantity	Unit
1	1/2″ GAS in CARBON STEEL drawing STA33	ASTM A105	400	pieces
2	3/4″ GAS in CARBON STEEL drawing STA33	ASTM A105	400	pieces
3	1″1/4 GAS in CARBON STEEL drawing STA33	ASTM A105	300	pieces
4	DN 15 in CARBON STEEL TIPO13 in drawing STA36	ASTM A105	300	pieces
5	DN 30 in CARBON STEEL drawing STA36	ASTM A105	200	pieces
6	EN 1092-1 05/A DN 65 threaded 1″1/2 GAS THR. PN10 in CARBON STEEL drawing STA37	ASTM A105	100	pieces
7	EN 1092-1 05/A DN 80 threaded 2″1/2 GAS THR. PN10 in CARBON STEEL drawing STA37	ASTM A105	50	pieces
8	EN 1092-1 05/A DN 100 threaded 2″1/2 GAS THR. PN10 in CARBON STEEL drawing STA37	ASTM A105	100	pieces

What is a threaded flange?

A threaded flange is a ring with internal threads and bolt holes. It screws directly onto a pipe for easy, weld-free connections in low-pressure systems like water lines. Its weakness is scientific: the sharp roots of the threads concentrate stress. Under high pressure, vibration, or heat, this can cause cracks or leaks, so it’s avoided in critical applications.

What is an SAE flange?

An SAE flange is a stout disc with bolt holes and a precision O-ring groove. Two halves bolt together, trapping and compressing the O-ring in its groove. The science here is smart: system pressure pushes the O-ring deeper into its seat, making the seal tighter as pressure rises. This makes it ideal for high-pressure, leak-proof hydraulic systems in machinery.

ASTM A105 Forged Steel Flange

Item	Description / Value
Material Type	Carbon Steel Forgings for Piping Components
Standard	ASTM A105 / A105N
Product Form	Forgings for flanges, valves, fittings, and other pressure-containing parts.
Chemical Composition (Heat Analysis, %)	C ≤ 0.35, Mn: 0.60–1.05, P ≤ 0.035, S ≤ 0.040, Si ≤ 0.35, Cu ≤ 0.40, Ni ≤ 0.40, Cr ≤ 0.30, Mo ≤ 0.12, V ≤ 0.08.
Heat Treatment	Typically supplied in the normalized or normalized and tempered condition.
Tensile Properties at Room Temp	Tensile Strength: ≥ 485 MPa (70 ksi)
	Yield Strength: ≥ 250 MPa (36 ksi)
	Elongation (in 2 in./50 mm): ≥ 22%
	Reduction of Area: ≥ 30%
	≤ 187 HB (Typical maximum)
Impact Testing	Not required by the base standard unless specified in the purchase order. Charpy values, if specified, are typically at 20°C (68°F).
Applicable Temperature Range	Generally recommended for service from -29°C to +425°C (-20°F to +800°F). Not recommended for prolonged service above 425°C due to graphitization risk.
Key Applications	Flanges, fittings, and valves in high-temperature and high-pressure service for petrochemical, power generation, and hydrocarbon processing industries.

EN 1092-1 Standard

EN 1092-1 is the core European standard specifying technical requirements for circular steel flanges. It systematically defines various flange types, their precise dimensions, applicable material grades, and pressure-temperature ratings based on PN (Pressure Nominal) classes from PN 2.5 to PN 400. The standard ensures safety and interchangeability by providing standardized tables for dimensions, sealing faces, and the maximum allowable working pressure for each material across different temperatures, serving as the essential basis for design, manufacturing, and procurement under the Pressure Equipment Directive (PED).

PN 10 Type 13 Threaded Flange Dimension

DN	Mating dimensions					Flange thickness	Length	Neck diameters	Corner radiiR1
	Outside diameterD	Diameter of bolt circle K	Diameter of bolt hole L	Bolting
				Number	Size	C₂	H1	N₂
10	90	60	14	4	M12	16	22	30	4
15	95	65	14	4	M12	16	22	35	4
20	105	75	14	4	M12	18	26	45	4
25	115	85	14	4	M12	18	28	52	4
32	140	100	18	4	M16	18	30	60	6
40	150	110	18	4	M16	18	32	70	6
50	165	125	18	4	M16	18	28	84	6
65	185	145	18	8d	M16	18	32	104	6
80	200	160	18	8	M16	20	34	118	6
100	220	180	18	8	M16	20	40	140	8
125	250	210	18	8	M16	22	44	168	8
150	285	240	22	8	M20	22	44	195	10
200	340	295	22	8	M20	24	44	246	10
250	395	350	22	12	M20	26	46	298	12
300	445	400	22	12	M20	26	46	350	12
350	505	460	22	16	M20	26	53	400	12
400	565	515	26	16	M24	26	57	456	12
450	615	565	26	20	M24	28	63	502	12
500	670	620	26	20	M24	28	67	559	12
600	780	725	30	20	M27	30	75	658	12
700	895	840	30	24	M27	35	一	一	12
800	1015	950	33	24	M30	38	一	一	12
900	1115	1050	33	28	M30	38	一	一	12
1000	1230	1160	36	28	M33	44	一	一	16
1200	1455	1380	39	32	M36	55	一	一	16
1400	1675	1590	42	36	M39	65	一	一	16
1600	1915	1820	48	40	M45	75	一	一	16
1800	2115	2020	48	44	M45	85	一	一	16
2000	2325	2230	48	48	M45	90	一	一	16
2200	2550	2440	56	52	M52	100	一	一	18
2400	2760	2650	56	56	M52	10	一	一	18
2600	2960	2850	56	60	M52	110	一	一	18
2800	3180	3070	56	64	M52	24	一	一	18
3000	3405	3290	62	68	M56	132	一	一	18

 Threaded Flange Application

•Low-pressure piping systems (e.g., water supply, air lines, fire sprinklers) where welding is impractical or costly.
•Instrumentation and sampling lines for easy disassembly and maintenance without cutting pipes.
•Non-critical utility services (e.g., cooling water, lubricant lines) where leakage risk is manageable.
•Temporary or modular piping installations requiring quick assembly and reconfiguration.

SAE Flange Application

•High-pressure hydraulic systems in mobile machinery (excavators, cranes, agricultural equipment).
•Industrial hydraulic power units and presses requiring leak-proof connections under pulsating loads.
•Fluid transfer systems in aerospace and defense for fuel or hydraulic lines with strict reliability standards.
•Marine and offshore equipment where compact, high-pressure fittings resist vibration and corrosion.

Inspection, Packing & Shipment

Before shipment, each flange underwent visual inspection, dimensional checks, and thread verification. Special attention was given to thread accuracy and sealing surfaces to ensure trouble-free installation at the job site.

For packing, the flanges were protected with anti-rust treatment and packed in strong plywood cases suitable for long-distance sea transportation, minimizing the risk of damage during transit.

Reliable Supply of Carbon Steel Flange

As an experienced manufacturer and exporter of industrial flanges, ZIZI supply carbon steel flange in various sizes, pressure ratings, and customized specifications. Each shipment reflects our commitment to quality control, technical standards, and dependable delivery.

If you are looking for a reliable supplier of carbon steel flanges for your piping or hydraulic projects, our team is ready to support your requirements.