WNRF, SORF, blind, lap-joint, threaded, RTJ, tongue-and-groove, male-and-female and custom flanges with class and PN drilling options.
New buyer guide: SA-240 vs SA-182 — plate, forgings and flange certificate checks →
Send NPS in inches, flange type, ASME standard, class, facing, exact material grade, bore or matching pipe schedule and quantity. Add your delivery city / ZIP or port, required date and inspection scope.
Request the offered origin, MTC, heat traceability, packing, freight scope and quotation currency. Steel Gems supplies from Mumbai, India; availability and delivery terms are confirmed in the written offer.
Choose your material below, or send your BOQ if several grades and sizes are required. Steel Gems reviews India and export requirements from Mumbai.
Stainless steel · weld neck, slip-on and blind enquiries
View requirements →ASTM A105N flangesCarbon steel · specify type, class, facing and bore
View requirements →Duplex 2205 piping productsSpecify F51 / F60 as ordered for forged flanges
View requirements →A material grade alone does not define the joint. Include NPS / DN, flange type, class or PN, facing, dimensional standard and bore / matching pipe schedule.
ASME class and EN PN designations are different rating systems. Confirm the approved piping class and mating components.
Attach your drawing, material list or purchase specification. Request offered origin, MTC, heat traceability and any PMI, NDT or third-party inspection needed for your project.
US and international buyers: add units, destination city / ZIP or port, required date and freight scope. Availability, compliance and delivery are confirmed in the written offer.
International references for Industrial Pipe Flanges. Select the required specification system, then complete your enquiry. Options are available for technical review; compliance and supply capability require written confirmation.
Selecting several references requests a compliance review. It does not establish equivalence or dual certification. Hidden selections remain in your enquiry.
0 reference groups selected
Class, PN and JIS K are separate rating systems; no automatic conversion or drilling compatibility is implied. NPS / DN is nominal, not actual OD. Similar grades are comparison candidates only. ASTM / ASME and EN designations are not automatic substitutes.
Certificates, inspection, IBR and project approvals are separate requirements. An ISO 9001 quality-system certificate is not a product approval. Current issuer editions may differ from the edition required by your contract.
STEEL GEMS — INTERNATIONAL SPECIFICATION ENQUIRY Product: Industrial Pipe Flanges Requested references: To confirm Exact grade / UNS / delivery condition: To confirm Required edition / addenda: To confirm Size, actual OD, wall / schedule and units: To confirm Rating system and value (Class / PN / JIS K / Table): To confirm Type, construction, connection, facing / thread: To confirm Quantity with unit: To confirm Documents / tests requested: To confirm Delivery city / country / ZIP / port: To confirm Project notes / origin restrictions / service conditions: To confirm Please review applicable scope, compatibility, material origin, manufacturing route, compliance, availability and commercial terms. This is an enquiry, not an engineering approval.
WhatsApp opens a draft for you to review and send. Files are not attached automatically; use the RFQ upload page or attach them separately.
Reference summaries only. Confirm full scope and required edition with the issuer and project specification.
Start with the material. Check the connection details. Send your requirement to Steel Gems for review.
36 grade references · manufacturing and sourcing feasibility confirmed against your requirement.
| Grade / alloy | Material / forging reference | Important buying check |
|---|---|---|
| 304 stainless steel flanges → Stainless steel | ASTM A182 F304 | Confirm corrosion medium, carbon requirement and whether F304L is explicitly required. |
| 304L stainless steel flanges → Stainless steel | ASTM A182 F304L | Ask whether dual-grade certification is required and whether both sets of properties are satisfied. |
| 316 stainless steel flanges → Stainless steel | ASTM A182 F316 | Confirm F316 versus F316L, service chemistry and project corrosion requirements. |
| 316L stainless steel flanges → Stainless steel | ASTM A182 F316L | Confirm heat treatment, grade marking, required PMI and any IGC examination. |
| 321 stainless steel flanges → Stainless steel | ASTM A182 F321 | State whether a high-temperature variant or specific stabilisation treatment is required. |
| 347 stainless steel flanges → Stainless steel | ASTM A182 F347 | Confirm exact grade suffix, heat treatment and high-temperature design requirements. |
| 310S stainless steel flanges → Stainless steel | Exact flange product specification and grade to confirm | Provide the governing code, forging specification, material condition and design temperature. |
| 317L stainless steel flanges → Stainless steel | ASTM A182 F317L | Confirm corrosion basis, chemical limits and inspection scope rather than assuming interchangeability with 316L. |
| 904L stainless steel flanges → Stainless steel | ASTM A182 F904L; verify ordered edition | Specify material identification, heat treatment and the required corrosion-testing basis. |
| A105 carbon steel flanges → Carbon & low-temperature steel | ASTM A105 / ASME SA105 | State heat-treatment condition, dimensional standard and any impact-test requirement. |
| A105N normalised carbon steel flanges → Carbon & low-temperature steel | ASTM A105 / ASME SA105, normalised condition | Confirm normalising records, marking and project-specific supplementary requirements. |
| LF2 low-temperature carbon steel flanges → Carbon & low-temperature steel | ASTM A350 LF2; class to specify | State LF2 class, impact-test temperature, acceptance criteria and thickness considerations. |
| F11 alloy steel flanges → Alloy steel | ASTM A182 F11; exact class / type where applicable | Specify F11 class, treatment, hardness and any required supplementary tests. |
| F22 alloy steel flanges → Alloy steel | ASTM A182 F22; exact class / type where applicable | Specify F22 class, normalising/tempering or other permitted condition, and hardness requirements. |
| F5 alloy steel flanges → Alloy steel | ASTM A182 F5; exact class / type where applicable | Confirm temperature basis, heat treatment, welding requirements and traceability. |
| F9 alloy steel flanges → Alloy steel | ASTM A182 F9; exact class / type where applicable | Confirm heat treatment and any additional examination or hardness criteria. |
| F91 alloy steel flanges → Alloy steel | ASTM A182 F91; exact class / type where applicable | State ordered type/class as applicable, heat treatment, hardness, welding and PWHT requirements. |
| F51 duplex flanges → Duplex & super duplex | ASTM A182 F51 · UNS S31803 | Specify exact UNS and required ferrite, corrosion and heat-treatment acceptance criteria. |
| F60 duplex flanges → Duplex & super duplex | ASTM A182 F60 · UNS S32205 | State F60 / S32205 explicitly; approve any proposed dual certification against both requirements. |
| F53 super duplex flanges → Duplex & super duplex | ASTM A182 F53 · UNS S32750 | Confirm ferrite, solution treatment, corrosion test and PMI scope. |
| F55 super duplex flanges → Duplex & super duplex | ASTM A182 F55 · UNS S32760 | Confirm exact UNS, heat treatment, ferrite and required corrosion-testing criteria. |
| Monel / Alloy 400 flanges → Nickel alloys | UNS N04400 · ASTM B564 / ASME SB564 forging enquiry | Confirm genuine ordered alloy identity, forging condition and service-specific corrosion review. |
| Monel / Alloy K-500 flanges → Nickel alloys | Exact forging specification and heat-treated condition to confirm | Provide the governing material standard, heat-treatment condition and approved engineering requirements. |
| Inconel / Alloy 600 flanges → Nickel alloys | Exact material / forging specification and condition to confirm | Confirm corrosion medium, temperature and permitted material condition. |
| Inconel / Alloy 601 flanges → Nickel alloys | Exact material / forging specification and condition to confirm | Confirm exact forging specification, product availability and design-temperature basis. |
| Inconel / Alloy 625 flanges → Nickel alloys | UNS N06625 · ASTM B564 / ASME SB564 forging enquiry | Specify UNS N06625 and ASTM B564 / ASME SB564 grade / class and heat-treatment requirements. |
| Inconel / Alloy 718 flanges → Nickel alloys | Exact material / forging specification and condition to confirm | State governing product standard, heat-treatment cycle and whether the project permits this flange material. |
| Alloy 800 flanges → Nickel alloys | Exact material / forging specification and condition to confirm | Identify the exact alloy and forging standard; do not group 800H/HT as automatic equivalents. |
| Alloy 800H flanges → Nickel alloys | Exact material / forging specification and condition to confirm | Provide exact material designation, product form, code and required material condition. |
| Alloy 800HT flanges → Nickel alloys | Exact material / forging specification and condition to confirm | Confirm permitted material specification and certified identity with the offered manufacturer. |
| Alloy 825 flanges → Nickel alloys | Exact material / forging specification and condition to confirm | Specify UNS N08825, the flange product standard, treatment and corrosion requirements. |
| Hastelloy / Alloy C276 flanges → Nickel alloys | Exact material / forging specification and condition to confirm | Specify UNS N10276 and the agreed forging standard, condition, PMI and inspection scope. |
| Hastelloy / Alloy C22 flanges → Nickel alloys | Exact material / forging specification and condition to confirm | Specify UNS N06022 and the applicable forging standard and corrosion-review basis. |
| Alloy 20 flanges → Nickel alloys | Exact material / forging specification and condition to confirm | Confirm exact material identity and flange product specification before accepting an alternative. |
| Titanium Grade 2 flanges → Titanium | ASTM B381 F-2 forging enquiry; verify ordered edition | Confirm Grade 2 forging identity, dimensional standard, cleanliness and contamination controls. |
| Titanium Grade 5 flanges → Titanium | ASTM B381 F-5 forging enquiry; verify ordered edition | Confirm alloy condition, code acceptance, material compatibility and required examinations. |
Specify NPS/DN, flange type, standard edition, class/PN and series. Add OD, thickness, PCD, hole count/diameter and hub dimensions for drawing-based items. For weld necks, specify bore or matching pipe schedule / actual wall and weld-end detail.
Open flange dimensions & drawings →Class 150 is not a universal 150 psi rating. Use the material-group rating at design temperature in the governing standard. ASME classes, EN PN designations and B16.47 series are not automatically interchangeable.
Review piping compatibility questions →Confirm facing, gasket standard/type/material and ring number where applicable. Specify studs, nuts, diameter, thread, length, material, coating and quantities. Joint suitability includes mating equipment and assembly requirements.
Explore gaskets → · Fasteners →Flange weight varies with geometry, bore, material density, facing and machining. Obtain the exact drawing or applicable dimension table before estimating; a simple ring blank is not a finished weld-neck flange weight.
Open existing weight calculators →A clear flange enquiry separates material, dimensions, connection geometry and inspection. Start with the project piping class and approved drawing.
F316 and F316L are distinct stainless forging grades. The lower-carbon designation is useful procurement information, but is not a complete material-selection rule.
Alloy 400 and Alloy 625 belong to different nickel-alloy systems. Select them against the actual service and ordered forging requirements, not a general “better alloy” ranking.
The two standards have different dimensional scopes. The size and series must be explicit before dimensions, bolting or mating compatibility are compared.
Manufacturing route and product specification are part of compliance. Similar-looking flanges are not necessarily equivalent purchasing items.
PMI does not replace all material certification or prove every grade attribute. Testing and certification are agreed by product and order; no universal approval or ready-stock claim is made.
Include destination city, country and postal code / port; currency; required date; packing and marking; Incoterms rule and named place. Identify approved-mill and material-origin restrictions before quotation. Importer / broker review is required for classification, duties and trade-remedy scope.
Ask for genuine photographs, sample documentation with private details removed and the offered manufacturing / sourcing route during quotation.
sales@steel-gems.com · +91 96199 26607Choose the connection and add your project details. No entry here confirms a pressure rating, material substitution or engineering approval.
8 core fields still need clarification. You can download or share the draft with gaps marked.
Form entries stay in this page until you choose to share or download them; they are not saved automatically. Include gasket, stud, nut and coating specifications separately if required.
No. The grade list is an enquiry reference. Product form, size, class, manufacturing route, source and inspection feasibility need written confirmation.
No. Facing, gasket, bore, material, pressure–temperature limits, equipment requirements and assembly conditions also need review.
Only with the responsible engineering approval against the actual service, code, material and fabrication requirements.
No. Define certificate type, inspection parties and witnessing requirements before the order; availability and cost depend on the agreed scope.
Reference information supports enquiry preparation. Verify the ordered standard edition and approved engineering specification.
Commercial alloy names identify material families; no affiliation with a trademark owner or authorised distributorship is implied. Supply is subject to a written, product-specific offer.
Open a permanent technical page for specifications, supply range, applications and inspection options.
Normalized forged carbon-steel flanges for pressure piping, supplied in standard facing and pressure classes.
View specification →ASTM A182 F304L / ASME B16.5ASTM A182 F304L Stainless Steel FlangesForged 304L stainless-steel flanges for corrosion-resistant process piping and welded fabrication.
View specification →ASTM A182 F316L / ASME B16.5ASTM A182 F316L Stainless Steel FlangesForged 316L flanges for corrosive chemical, marine, pharmaceutical and process piping service.
View specification →Steel Gems supports material certification, heat-number traceability, NABL laboratory testing, NDT and third-party inspection for Industrial Pipe Flanges when required by the purchase specification.