EN 1092-1 PN10 Weld Neck Flanges Order

We are pleased to announce the successful preparation and shipment of a batch of high-quality stainless steel flanges. This order, comprising EN 1092-1 PN10 Weld Neck Flanges manufactured from premium SMO 254 (UNS S31254) material, is destined for a critical chemical processing application. Each flange, designated as “FLANGE,WNRF,BW,SMO254,DN50,PN10,SCH10S”, has undergone rigorous quality control to ensure full compliance with all relevant standards and customer specifications. This shipment underscores our commitment to delivering reliable components for the most challenging industrial environments.

Weld Neck Flanges

Weld neck flanges (WN) are known for their extended tapered hub, which is carefully welded to the connecting pipe. This construction offers superior structural strength compared to other flange types, making them particularly suitable for applications involving high pressure, extreme temperatures, frequent thermal changes, and hazardous media. The gradual transition from the flange thickness to the pipe wall helps minimize stress concentration, ensuring that EN 1092-1 PN10 weld neck flanges serve as a durable and dependable solution for critical piping infrastructures.

Introduction to EN 1092-1 Standard

The EN 1092-1 standard, established by CEN (European Committee for Standardization), covers circular flanges made from steel, including weld neck, slip-on, blind, threaded, and socket weld types. It specifies pressure designations from PN2.5 to PN400. For EN 1092-1 PN10 weld neck flanges, the PN10 rating means they are suitable for nominal pressure up to 10 bar. The standard also defines dimensions such as bolt circle, thickness, and facing type, ensuring compatibility across European piping systems.

SMO 254 (UNS S31254) Stainless Steel Chemical Composition

The exceptional corrosion resistance of this shipment’s flanges is attributed to the use of SMO 254 (UNS S31254), a premium “super-austenitic” stainless steel. Its chemical composition is critical to its performance:

CHEMICAL	C	Mn	Si	P	S	Cr	Ni	Mo	N	Cu
SMO 254 (UNS S31254)	≤0.020	≤1.00	≤0.80	≤0.030	≤0.010	19.5–20.5	17.5–18.5	6.0–6.5	0.18–0.22	0.5–1.0

SMO 254 (UNS S31254) Mechanical Properties Analysis

The mechanical properties of SMO 254 stainless steel ensure that the EN 1092-1 PN10 weld neck flanges can withstand significant mechanical stress and pressure loads. Key properties include:

MATERIAL	T.S (MPA)	Y.S (MPA)	EL %	Hardness
SMO 254 (UNS S31254)	≥ 650 MPa	≥ 300 MPa	≥ 35%	≤ 270

EN 1092-1 PN10 Weld Neck Flanges Dimensions

DN	Mating dimensions					Outside diameter of neck A	Flange thickness	Length		Neck diameters	Corner radii R1
	Outside diameter D	Diameter of bolt circle K	Diameter of bolt hole L	Bolting
				Number	Size		C₂	H₂	H₃	N1
10	90	60	14	4	M12	17.2	16	35	6	28	4
15	95	65	14	4	M12	21.3	16	38	6	32	4
20	105	75	14	4	M12	26.9	18	40	6	40	4
25	115	85	14	4	M12	33.7	18	40	6	46	4
32	140	100	18	4	M16	42.4	18	42	6	56	6
40	150	110	18	4	M16	48.3	18	45	7	64	6
50	165	125	18	4	M16	60.3	18	45	8	74	6
65	185	145	18	8d	M16	76.1	18	45	10	92	6
80	200	160	18	8	M16	88.9	20	50	10	105	6
100	220	180	18	8	M16	114.3	20	52	12	131	8
125	250	210	18	8	M16	139.7	22	55	12	156	8
150	285	240	22	8	M20	168.3	22	55	12	184	10
200	340	295	22	8	M20	219.1	24	62	16	234	10
250	395	350	22	12	M20	273.0	26	68	16	292	12
300	445	400	22	12	M20	323.9	26	68	16	342	12
350	505	460	22	16	M20	355.6	26	68	16	385	12
400	565	515	26	16	M24	406.4	26	72	16	440	12
450	615	565	26	20	M24	457.0	28	72	16	488	12
500	670	620	26	20	M24	508.0	28	75	16	542	12
600	780	725	30	20	M27	610.0	30	82	18	642	12
700	895	840	30	24	M27	711.0	35	85	18	746	12
800	1015	950	33	24	M30	813.0	38	96	18	850	12
900	1115	1050	33	28	M30	914.0	38	99	20	950	12
1000	1230	1160	36	28	M33	1016.0	44	105	20	1052	16
1200	1455	1380	39	32	M36	1219.0	55	132	25	1256	16
1400	1675	1590	42	36	M39	1422.0	65	143	25	1460	16
1600	1915	1820	48	40	M45	1626.0	75	159	25	1666	16
1800	2115	2020	48	44	M45	1829.0	85	175	30	1868	16
2000	2325	2230	48	48	M45	2032.0	90	186	30	2072	16
2200	2550	2440	56	52	M52	2235.0	100	202	35	2275	18
2400	2760	2650	56	56	M52	2438.0	10	218	35	2478	18
2600	2960	2850	56	60	M52	2620.0	110	224	40	2680	18
2800	3180	3070	56	64	M52	2820.0	24	244	40	2882	18
3000	3405	3290	62	68	M56	3020.0	132	257	45	3085	18

If you wish to learn about other sizes of European standard butt-weld flanges, please click the link below：

https://www.zzflange.com/category/en-1092-1-dimension/type-11/

Raised Face (RF) Surface

The Raised Face (RF) is the sealing surface on these flanges. It features a small, raised circular area (typically 1-2 mm in height) around the bore. When two RF flanges are bolted together with a gasket (often a spiral-wound type) in between, the raised surfaces concentrate the compressive force onto the gasket. This creates a much more effective and reliable metal-to-gasket seal compared to a flat face, especially under variable pressure and temperature conditions, which is a key feature of the EN 1092-1 PN10 weld neck flanges we supply.

Understanding SCH10S

SCH10S is a pipe schedule number where the S stands for “Stainless Steel”. It specifies the wall thickness of the pipe that the flange is designed to weld to. For a DN50 (NPS 2) pipe, SCH10S corresponds to a specific wall thickness. This designation ensures that the flange’s welding neck is machined to the correct outside diameter and bevel to perfectly match the pipe, ensuring a full-penetration weld that is as strong as the pipe itself. This compatibility is crucial for the integrity of the entire system.

Advantages of Stainless Steel Weld Neck Flanges

✅Excellent corrosion resistance in aggressive environments

✅High mechanical strength and durability

✅Reliable sealing performance with RF face design

✅Compatibility with international standards

✅Long service life and reduced maintenance costs

Conclusion

In summary, this shipment of SMO254, DN50, PN10, SCH10S EN 1092-1 PN10 weld neck flanges embodies the pinnacle of performance, reliability, and standardization. From the rigorous EN 1092-1 standard and the robust weld neck design to the exceptional corrosion resistance of SMO 254 stainless steel and the precise compatibility with SCH10S piping, every aspect is engineered for excellence in critical service. We are confident that these components will perform flawlessly in our client’s demanding application.