GOST 33259 type 11-B steel weld neck flange

GOST 33259 type 11-B weld neck flange Manufacturer

We are a professional manufacturer and exporter of GOST 33259 Type 11-B Weld Neck Flanges

A weld neck flange (also known as a high-hub flange and tapered hub flange) is a type of flange

A weld neck flange consists of a circular fitting with a protruding rim around the circumference. Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts

GOST 33259-2015, Type 11 designates a weld neck flange—a high-integrity, butt-welded connection ideal for high-pressure and high-temperature piping systems. The hub is machined to match pipe OD, providing smooth stress transition and excellent fatigue resistance.

GOST 33259 is a Russian standard which specified the dimensions, tolerances, and technical requirements for steel pipe flanges.

Specifications

Standard: GOST 33259-2015 (weld neck flanges)
Sizes: DN 10–DN 2000 (½″–80″)
Pressure Classes: PN 6, 10, 16, 25, 40, 63, 100
Face Types: Raised Face (RF) or Ring-Type Joint (RTJ) options
Material:Carbon Steel (CT-20 / ASTM A105)/ Stainless steel SS304/L,SS316/L,SS321,SS904L

GOST 33259 type 11-B PN10 steel weld neck flange Dimension

15	10	12	12	35	6	30	19	95	65	47	4	14	2	0.58
20	10	18	14	38	6	38	26	105	75	58	4	14	2	0.87
25	10	25	14	40	6	45	33	115	85	69	4	14	2	1.05
32	10	31	15	42	6	55	39	135	100	78	4	18	2	1.54
40	10	38	16	45	7	62	46	145	110	88	4	18	3	1.83
50	10	49	16	45	8	76	58	160	125	102	4	18	3	2.26
65	10	66	18	48	10	94	77	180	145	122	4	18	3	3.17
80	10	78	18	50	10	105	90	195	160	133	4	18	3	3.67
100	10	96	20	51	12	128	110	215	180	158	8	18	3	4.7
125	10	121	22	60	12	156	135	245	210	184	8	18	3	6.76
150	10	146	22	60	12	180	161	280	240	212	8	22	3	8.9
200	10	202	22	61	16	240	222	335	295	268	8	22	3	11.4
250	10	254	24	63	16	290	278	390	350	320	12	22	3	14.6
300	10	303	26	64	16	345	330	440	400	370	12	22	4	19.3
350	10	351	26	64	16	400	382	500	460	430	16	22	4	24.7
400	10	398	26	64	16	445	432	565	515	482	16	26	4	30
450	10	450	26	69	16	500	484	615	565	532	20	26	4	34.7
500	10	501	28	69	16	550	535	670	620	585	20	26	4	40
600	10	602	29	70	18	650	636	780	725	685	20	30	5	50
700	10	692	30	70	18	744	726	895	840	800	24	30	5	65.3
800	10	792	32	80	18	850	826	1010	950	905	24	33	5	87.2
900	10	892	34	85	20	950	926	1110	1050	1005	28	33	5	103
1000	10	992	34	85	20	1050	1028	1220	1160	1110	28	33	5	119
1200	10	1192	38	95	25	1256	1228	1455	1380	1330	32	39	5	180

GOST 33259 type 11-B PN16 steel weld neck flange Dimension

15	16	12	14	35	6	30	19	95	65	47	4	14	2	0.68
20	16	18	14	38	6	38	26	105	75	58	4	14	2	0.87
25	16	25	14	40	6	45	33	115	85	68	4	14	2	1.05
32	16	31	15	42	6	55	39	135	100	78	4	18	2	1.54
40	16	38	16	45	7	64	46	145	110	88	4	18	3	1.85
50	16	49	16	48	8	76	58	160	125	102	4	18	3	2.28
65	16	66	18	50	10	94	77	180	145	122	8	18	3	3.19
80	16	78	20	53	10	110	90	195	160	133	8	18	3	4.21
100	16	96	20	53	12	130	110	215	180	158	8	22	3	4.9
125	16	121	22	60	12	155	135	245	210	184	8	26	3	6.76
150	16	146	22	60	12	180	161	280	240	212	8	26	3	8.3
200	16	202	24	61	16	240	222	335	295	268	12	30	3	11.8
250	16	254	26	63	16	292	278	405	358	320	12	30	3	17.4
300	16	303	28	70	16	346	330	460	410	370	16	33	4	22.8
350	16	351	32	74	16	400	382	520	470	430	16	33	4	33.1
400	16	398	36	79	16	450	432	580	525	482	16	39	4	43
450	16	450	38	89	16	506	484	640	585	532	20	39	4	54
500	16	501	42	94	16	559	535	710	650	585	20	45	4	71
600	16	602	46	95	18	660	636	840	770	685	20	52	5	99.3
700	16	692	48	100	18	750	726	910	840	800	24	52	5	106
800	16	792	50	100	20	850	826	1020	950	905	24	52	5	131
900	16	892	52	115	20	958	926	1120	1050	1005	28	56	5	148
1000	16	992	54	115	22	1060	1028	1255	1170	1130	28	56	5	203
1200	16	1192	56	130	30	1268	1228	1485	1390	1330	32	62	5	285

Want to know more about our gost 33259 Type 01 Flat welding flanges?

GOST 33259 type 11-B steel weld neck flange

Item 1: GOST 33259-2015 Type 11-B weld-neck flange, DN 100, PN 16, AISI 321, RF, butt-weld bevel per GOST 33259, Quantity: 50 pcs; MTC 3.1; marking with heat no.packed in wooden crate; d

Quality Control and Inspection

Each GOST 33259 Type 11-B Weld Neck Flange we produce are with strict quality control and testing:

✅ Visual Inspection (Surface Finish, Dimensions)
✅ Ultrasonic Inspection
✅ Positive Material Identification (PMI)
✅ Material Traceability (with EN 10204 3.1 or 3.2 certificate)