Alloy-steel flange series
ALLOY STEEL FLANGE SERIES
Alloy-steel flanges require an agreed grade, material specification and heat-treatment condition. Provide the design temperature and pressure so the flange standard, dimensions and material can be checked together.
- Material designations listed
- 12Cr1MoV; 15CrMo; P91; P22; 10CrMo910 — exact governing material specification TBC.
- Standard families — separate options
- ANSI/ASME; DIN; BS; JIS; UNI; EN 1092-1. Select one exact standard and edition.
- PN designations listed
- PN6 / PN10 / PN16 / PN25 / PN40
- Class designations listed
- Class 150 / 300 / 400 / 600 / 900 — alternatives, not working pressure in psi.
- Structure options listed
- Slip-on, weld neck, blind, lap joint, socket weld, threaded, plate, loose, SOP and SOH (A/B/C); applicable type standard TBC.
- Facing options listed
- RF / FF / RTJ — selected type and standard must permit the facing.
- Ordered size and drilling
- TBC — no size-by-size dimensional table is published on this product page.
- Pressure–temperature rating
- TBC for the selected material, standard, size and operating temperature.
Confirm configuration, price, quantity and lead time for each enquiry.
Selection questions
What should I include in a flange enquiry?
Provide standard and edition, size, material specification and grade, type, pressure designation, facing, quantity, and design pressure/temperature. Include a mating drawing when drilling or bore dimensions are critical.
Does the pressure designation equal the working pressure?
No single operating-pressure value follows from PN or Class alone. Confirm the applicable pressure–temperature rating for the selected standard, material and temperature.
Can flanges of the same nominal size be connected directly?
Check the exact standard, bolt-hole count and diameter, bolt circle, bore, facing and gasket arrangement. A matching size label alone does not establish interchangeability.
Specifications compiled from available product documents。Dimensions, performance and suitability are subject to confirmed drawings and ordering documents.
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