Is the PN16 fixed neck flange (EN1092-1, type 11B1, AISI 304 steel) suitable for welding to stainless steel pipelines and hoses?

Yes. The PN16 fixed neck flange, EN1092-1, type 11B1, AISI 304 steel is suitable for welding to stainless steel pipelines and hoses. Reasoning: - Material compatibility: AISI 304 is a common austenitic stainless steel used for pipelines and hose ends; welding 304 to 304 provides metallurgical compatibility and good corrosion resistance. - Standard and design: The flange conforms to EN1092-1 (type 11B neck, B1 sealing face) and PN16 rating, intended for welded-ring (welding neck) connections, offering a secure, pressure-rated joint suitable for industrial pipelines and flexible hose connections. - Welding considerations: Use appropriate stainless steel welding procedures (e.g., TIG/MIG with matching filler like ER308/308L or per engineer spec), control heat input to minimize sensitization, and apply proper joint preparation and post-weld cleaning/passivation as required by service conditions. - Service limitations: For aggressive corrosive media, high chloride environments, or temperatures that promote chloride stress corrosion cracking, consider higher-alloy materials (e.g., 316/316L) or additional protective measures. In summary: The PN16 fixed neck flange, EN1092-1, type 11B1, AISI 304 steel is suitable for welding to stainless steel pipelines and hoses when welded with appropriate procedures and material considerations; evaluate process fluid and environment to confirm 304 is adequate.

How does the PN16 fixed neck flange (EN1092-1, type 11B1, AISI 304 steel) perform under corrosive or high-temperature service conditions?

The PN16 fixed neck flange, EN1092-1, type 11B1, AISI 304 steel offers good general corrosion resistance and mechanical stability in many industrial services, but has limits in aggressive or high-temperature environments. AISI 304 resists oxidation and many mild chemical exposures (water, air, some acids) at ambient to moderately elevated temperatures, maintaining the PN16 rating and flange integrity. However, in chloride-rich, highly acidic, alkaline or corrosive chemical atmospheres it is susceptible to pitting and crevice corrosion; in such cases duplex stainless steels or higher-grade alloys (e.g., 316/316L, 6Mo, Hastelloy) are recommended. At elevated temperatures, AISI 304 can lose strength and suffer sensitization (grain boundary attack) above ~425â850Â°C depending on exposure, reducing corrosion resistance and seal reliability. For corrosive or highâtemperature services assess media, concentrations and temperature and consider material upgrade or protective coatings.

What torque values are recommended for bolting a PN16 fixed neck flange, EN1092-1, type 11B1, AISI 304 steel?

For a PN16 fixed neck flange, EN1092-1, type 11B1, AISI 304 steel, recommended bolt torque depends on bolt size, thread type, lubrication and gasket. Typical guidance (for standard isotropic steel bolting, lubricated threads, target preload â 70â90% of proof load for PN16 flange joints) is: - M8. 20â25 NÂ·m - M10. 40â50 NÂ·m - M12. 70â80 NÂ·m - M16. 160â180 NÂ·m - M20. 300â340 NÂ·m - M24. 480â540 NÂ·m - M27. 700â760 NÂ·m - M30. 900â980 NÂ·m Notes: - These are typical reference torques for stainless-steel flanges with common gasket types (soft PTFE/graphite or non-metallic). For metal-to-metal (B1) sealing faces and PN16 service, verify gasket-specific torque; metal contact may require higher bolt loads or use of ring gasket and follow gasket supplier data. - Adjust torques for dry threads (reduce ~10â20% if dry), heavily lubricated threads (increase caution), or different bolt materials. Use calibrated torque wrench and star-pattern tightening in multiple passes to achieve uniform preload. - For critical installations, consult flange/bolt/gasket manufacturers or EN1591 calculations for exact required preload and torque.

Flange fixed weld-neck EN1092-1, type 11B1, PN16, steel AISI 304

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Additional information

Material	SS – stainless steel

The fixed flange is made in accordance with the EN1092-1 standard, with a weld-neck type 11B, sealing surface type B1 and nominal pressure PN16. The flange coupling is one of the most widely used in industry, primarily for connecting sections of process pipelines, but also for connections with flexible hoses. Thanks to its special design, it creates a tight and solid joint, guaranteeing excellent parameters and reliability of the entire installation. Material: steel AISI 304.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
TK-KSS-015-SS	Flange fixed weld-neck EN1092-1 type 11B1 DN15 PN10-40, AISI 304	16	16	In stock	Enquiry
TK-KSS-020-SS	Flange fixed weld-neck EN1092-1 type 11B1 DN20 PN10-40, AISI 304	20	16	In stock	Enquiry
TK-KSS-025-SS	Flange fixed weld-neck EN1092-1 type 11B1 DN25 PN10-40, AISI 304	25	16	In stock	Enquiry
TK-KSS-032-SS	Flange fixed weld-neck EN1092-1 type 11B1 DN32 PN16, AISI 304	32	16	In stock	Enquiry
TK-KSS-040-SS	Flange fixed weld-neck EN1092-1 type 11B1 DN40 PN16, AISI 304	40	16	In stock	Enquiry
TK-KSS-050-SS	Flange fixed weld-neck EN1092-1 type 11B1 DN50 PN16, AISI 304	50	16	In stock	Enquiry
TK-KSS-065-SS	Flange fixed weld-neck EN1092-1 type 11B1 DN65 PN16, AISI 304	65	16	In stock	Enquiry
TK-KSS-080-SS	Flange fixed weld-neck EN1092-1 type 11B1 DN80 PN16, AISI 304	80	16	In stock	Enquiry
TK-KSS-100-SS	Flange fixed weld-neck EN1092-1 type 11B1 DN100 PN16, AISI 304	100	16	In stock	Enquiry
TK-KSS-125-SS	Flange fixed weld-neck EN1092-1 type 11B1 DN125 PN16, AISI 304	125	16	In stock	Enquiry
TK-KSS-150-SS	Flange fixed weld-neck EN1092-1 type 11B1 DN150 PN16, AISI 304	150	16	In stock	Enquiry

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The fixed flange is made in accordance with the EN1092-1 standard, with a weld-neck type 11B, sealing surface type B1 and nominal pressure PN16. The flange coupling is one of the most widely used in industry, primarily for connecting sections of process pipelines, but also for connections with flexible hoses. Thanks to its special design, it creates a tight and solid joint, guaranteeing excellent parameters and reliability of the entire installation. Material: steel AISI 304.