Alloy Steel Flanges A182 F11/F22/F91 WNRF & SORF Manufacturer & Supplier for Oil & Gas and EPC Projects

When the Flange Is Part of a Critical Piping System, Specification Control Matters

PETROL STEEL CO., LTD. supplies Alloy Steel Flanges ASTM A182 F11, F22, and F91 in the Weld Neck Raised Face (WNRF) and Slip-On Raised Face (SORF) configurations for international oil & gas, petrochemical, refinery, power generation, and other high-temperature piping projects. These are not commodity piping parts chosen by size and price. The material grade, forging route, heat treatment, dimensions, pressure class, facing, traceability, inspection, and documentation all need to meet the approved project specification for EPC procurement.

ASTM A182 F11, F22, and F91 are well-known Cr-Mo alloy steel grades where piping components need to be exposed to severe temperature and pressure conditions. F11 and F22 are both well known for high-temperature applications and power applications. F91 is a higher-alloy Cr-Mo-V grade used extensively in demanding steam and high-temperature service. Industry suppliers and EPC-oriented flange specialists still put these grades in and around refinery, petrochemical, power, and process piping.

So the goal for PETROL STEEL is not just to quote an A182 flange. To provide the correct flange as per the buyer’s specification, manage the necessary manufacturing and inspection process, control documentation, and deliver a shipment that can pass through the customer’s engineering, procurement, QA/QC, and receiving procedures without undue uncertainty.

A182 F11, F22, and F91 Flanges Built Around the Project Specification

We provide ASTM A182 / ASME SA182 alloy steel flanges in WNRF and SORF configurations with dimensions and pressure ratings selected as per the relevant standard and project specifications. Typical procurement information includes NPS, pressure class, flange facing, bore or pipe schedule, material grade, quantity, applicable dimensional standard, and inspection requirements.

The dimensional framework may incorporate ASME B16.5 for standard flange sizes and ASME B16.47 for applicable large diameter requirements in addition to project-specific specifications and inspection plans. Documentation and testing may include material certificates, chemical composition, mechanical properties, heat-treatment records, dimensional inspection, PMI, hardness testing, and applicable NDT depending on the purchase order. Third-party inspections can also be arranged as and when required by the purchaser or project ITP. These requirements are consistent with documentation and traceability requirements found in international EPC flange procurement.

For an overseas buyer, the practical benefit is simple: instead of having to deal with separate technical, quality, and logistics contacts, PETROL STEEL integrates the supply process around the whole RFQ.

Technical Data for EPC Engineering and Procurement Review Parameters

PETROL STEEL Supply Scope

Material: ASTM A182 F11 / F22 / F91 Cr-Mo Alloy Steel

Flange Types: We offer Weld Neck Raised Face (WNRF), Slip-On Raised Face (SORF), Weld Neck (WN), Slip-On (SO), Blind (BL), Socket Weld (SW), Threaded (THD), Lap Joint (LJ), and other common flange types. Standard facing options are Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ) for higher-pressure and critical service applications.

The pressure classes and pressure ratings are according to the relevant standard and project requirements. Our standard scope of supply covers the major international standards like ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS, and API specifications. Common ASME pressure classes are Class 150, 300, 600, 900, 1500, and 2500, while EN flanges can be supplied in commonly specified PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160 ratings.

Nominal Size: Commonly NPS 1/2″–24″; larger sizes subject to applicable standard and project requirements

Pressure Class: According to size, material grade, and applicable ASME/project specification

Facing: Raisd Face (RF); other configurations subject to RFQ

Fabrication: Forging, heat treatment, machining, and finishing according to applicable requirements

Dimensions: ASME B16.5 / ASME B16.47 or approved project drawings/specifications

Flange Thikness: According to NPS, pressure class, flange type, and applicable dimensional standard

Surface Protection: Rust preventive treatment or project-specified protection

Dimensional Control: According to applicable standards and approved drawings

Inspection: Chemical, mechanical, visual, and dimensional inspection; additional testing according to project requirements

Documentation: MTC / EN 10204 3.1; 3.2 and additional project documentation where specified

Packing: Export seaworthy wooden cases, pallets, or secured bundles with flange-face protection.

Typical Applications: Oil & Gas, Refinery, Petrochemical, Power Generation, LNG, Chemical Processing, and High-Temperature Piping.

Technical Data Technical Specifications

Quality Is Managed Before Shipment, Not Explained After Delivery

The flange quality control of critical alloy steel should be apparent in the supply process. PETROL STEEL has an experienced internal QC team for each order and also arranges third-party inspection for each shipment as per the agreed inspection scope. The idea is to show compliance before the material leaves the supply chain, rather than the buyer having to identify differences when it arrives.

Typical inspection and verification can include material identification, chemical composition, mechanical properties, heat-treatment records, dimensional accuracy, flange facing, marking, and traceability. Further examinations like PMI, hardness testing, UT, MT, or PT can be arranged according to the approved inspection plan. The detailed inspection scope is subject to the purchase order, project specification, and agreed ITP.

PETROL STEEL has been exporting A182 F11/F22/F91 WNRF & SORF alloy steel flanges for over 10 years. According to the stated supply record, the company does not have any industry claim cases on these products and related services. This track record is provided as a statement of supply history and not as a substitute for project-specific inspection or contractual quality requirements.

A Supply Team Built for International EPC Procurement

The flange order may look simple on a purchase order, but an international EPC supply package can involve engineering clarification, material verification, production coordination, inspection scheduling, document review, export packing, and shipment control.

PETROL STEEL supports this process with a technical team with more than 10 years of experience in the industry, an international sales and marketing team with more than 15 years of experience, a QC team with an average of more than 10 years of experience, and a logistics team with an average of more than 10 years of experience.

If the buyer provides a flange schedule, material requisition, drawing, ITP, or project specification rather than a simple product description, then this experience is particularly relevant. Our team can check the requirements provided, clarify technical points before the order confirmation, and coordinate the commercial and supply chain process through shipment and after-sales service.

For PETROL STEEL, this is part of a larger positioning. Oil & Gas Piping Authority means staying close to the piping system, engineering specification, and procurement process rather than expanding into unrelated product categories just to increase a catalog.

4–5 Weeks for Regular Orders, With the RFQ Defining the Real Delivery Schedule

Lead time for regular orders of Alloy Steel Flanges A182 F11/F22/F91 WNRF & SORF is about 4-5 weeks, subject to the availability of material, quantity of order, technical requirements, scope of inspection, and acceptance of final order.

The RFQ is the starting point for the delivery planning and not the purchase order. Buyers should be encouraged to provide the material grade, NPS, flange type, pressure class, facing, bore/pipe schedule, quantity, applicable standard, inspection requirements, documentation requirements, and required delivery date for project procurement.

PETROL STEEL can then schedule technical review, manufacturing, QC inspection, third-party inspection, export packing, and shipping arrangements to suit the project schedule. Where possible, buyers should submit drawings or project specifications with the inquiry so that the technical and commercial requirements can be reviewed together.

Send Your Flange RFQ — Technical Review Comes Before the Quotation

If you are sourcing ASTM A182 F11, F22, or F91 WNRF/SORF flanges for an oil & gas, refinery, petrochemical, power, LNG, or other industrial piping project, send PETROL STEEL your flange schedule, drawing, or RFQ.

Please include, where available:

Material Grade → Flange Type → NPS → Pressure Class → Facing → Bore/Pipe Schedule → Quantity → Standard → Inspection/ITP → Documentation → Delivery Location → Required Delivery Date

Send Your Drawing or RFQ → PETROL STEEL Technical Team Review → Technical & Commercial Quotation

Required Information

PETROL STEEL CO., LTD. is ready to provide support to international EPC contractors, engineering firms, procurement departments, distributors, and industrial buyers with specification-based supply of Alloy Steel Flanges A182 F11/F22/F91 WNRF & SORF.

The buyer’s objective is not just to buy a flange. It is to get the right material, to the right specification, with controlled inspection, traceable documentation, and coordinated delivery.