DIN 2632 Weld Neck Flanges Order

On March 25, 2025, we received a repeat order for DIN 2632 weld neck flanges from a long-standing client in Shanghai. Given our established business relationship, the client placed the order immediately upon receiving the quotation from our sales representative.

Order Information

Product Name: weld neck flange

Flange Face:RF

Dimensions:DN50

Pressure:PN10

Port Thickness:SCH10S

Material:SMO 254

Standard:DIN 2632

DIN 2632 Standard

The DIN 2632 is a German Institute for Standardization specification that specifically governs the dimensions, materials, and pressure ratings for steel weld neck flanges with a raised face. This standard is widely recognized and respected across Europe and in international projects for its precision and reliability. It defines a range of Pressure Nominal ratings, with PN 10 being a common designation for medium-pressure applications.

What is a Weld Neck Flange

A weld neck flange (WNRF) features a long tapered hub that transitions smoothly to the pipe. This structure reduces stress concentration at the base of the flange and provides excellent mechanical strength. PN10 weld neck flanges are particularly used in systems where vibration, high pressure, or high temperature variations occur, as the welded neck ensures a continuous and strong connection.

Compared with slip-on or plate flanges, weld neck flanges offer better fatigue resistance and sealing reliability, which is why they are commonly used in oil, gas, chemical, and power industries.

Raised Face Flange

The term “Raised Face” refers to the sealing surface of the flange. As the name suggests, this type of flange has a raised ring on its face where the gasket is seated. When two raised face flanges are bolted together, the gasket is compressed between these two raised surfaces, creating a tight and effective seal. This design helps to concentrate the bolting pressure on a smaller area, thereby enhancing the sealing capability. All DIN 2632 flanges, including the PN10 weld neck flanges we discuss, typically come with a raised face, making them ideal for a wide array of sealing applications.

SMO254(UNS S31254)Material

SMO254 (UNS S31254) is a super austenitic stainless steel that combines high strength with excellent resistance to pitting, crevice, and chloride stress corrosion. When DIN 2632 PN10 weld neck flanges are made from SMO254, they are particularly suited for seawater systems, desalination plants, and chemical process industries.

UNS S31254 Chemical Composition

• Chromium (Cr): 19.5–20.5%
• Molybdenum (Mo): 6.0–6.5%
• Nitrogen (N): 0.18–0.22%
• Nickel (Ni): 17.5–18.5%

UNS S31254 Mechanical Properties

• Tensile strength: ≥ 650 MPa
• Yield strength: ≥ 300 MPa
• Elongation: ≥ 35%

DIN 2632 PN 10 Weld Neck Flange Dimension

Size		Pipe	Flange						Neck				Raised Face		Drilling		Weight
mm	inch	d1	D	A	T	T-F	K	h1	h2	d3	S	r	F	G	Bolt No	.H	Kg/Pc
DN 15	1/2“	21.3	95	17.3	14	12	65	35	6	32	2.0	4	2	45	4	14	0.66
DN 20	3/4″	26.9	105	22.3	16	14	75	38	6	40	2.3	4	2	58	4	14	0.96
DN 25	1″	33.7	115	28.5	16	14	85	38	6	45	2.6	4	2	68	4	14	1.15
DN 32	1/4″	42.4	140	37.2	16	14	100	40	6	56	2.6	6	2	78	4	18	1.67
DN 40	1 1/2″	48.3	150	43.1	16	13	110	42	7	64	2.6	6	3	88	4	18	1.85
DN 50	2″	60.3	165	54.5	18	15	125	45	8	75	2.9	6	3	102	4	18	2.51
DN 65	2 1/2″	76.1	185	70.3	18	15	145	45	10	90	2.9	6	3	122	4	18	3.06
DN 80	3″	88.9	200	82.5	20	17	160	50	10	105	3.2	8	3	138	8	18	3.86
DN 100	4″	114.3	220	107.1	20	17	180	52	12	131	3.6	8	3	158	8	18	4.45
DN 125	5″	139.7	250	131.7	22	19	210	55	12	156	4.0	8	3	188	8	18	6.12
DN 150	6″	168.3	285	159.3	22	19	240	55	12	184	4.5	10	3	212	8	22	7.47
DN 200	8″	219.1	340	207.3	24	21	295	62	16	235	5.9	10	3	268	8	22	11.20
DN 250	10″	273.0	395	260.4	26	23	350	68	16	292	6.3	12	3	320	12	22	15.05
DN 300	12″	323.9	445	309.7	26	22	400	68	16	344	7.1	12	4	370	12	22	17.63
DN 350	14″	355.6	505	341.4	26	22	460	68	16	385	7.1	12	4	430	16	22	23.92
DN 400	16″	406.4	565	392.2	26	22	515	72	16	440	7.1	12	4	482	16	26	28.98
DN 450	18″	457.0	615	442.8	28	24	565	72	16	488	7.1	12	4	532	20	26	33.36
DN 500	20″	508.0	670	493.8	28	24	620	75	16	542	7.1	12	4	585	20	26	38.61
DN 600	24″	610.0	780	595.8	28	23	725	80	18	642	7.1	12	5	685	20	30	46.97

Advantages of SMO 254 Flanges

✅Exceptional Resistance to Pitting and Crevice Corrosion

✅High Resistance to Stress Corrosion Cracking

✅Superior Strength and Excellent Ductility

✅Good Weldability and Fabrication Properties

✅Excellent Performance in Acidic and Chloride Environments