A691 9 Cr Welded Pipes – Strength & Corrosion Resistance

KVN alloy steel welded pipes are meticulously manufactured to meet the demanding requirements of various industries across India, the United Arab Emirates (UAE), the Kingdom of Saudi Arabia (KSA), Kuwait, Qatar, the Sultanate of Oman, Iran, and Iraq. Designed with a high chromium content and reduced carbon levels, these pipes offer enhanced mechanical strength and corrosion resistance. Their magnetic nature, combined with excellent ductility and structural integrity, makes them a reliable solution for diverse applications. Offered in a range of outer diameters and lengths, our pipes are ideal for customized and large-scale industrial requirements, supporting sectors such as automotive components, utility equipment, and industrial installations.

Technical Overview

These alloy steel welded pipes are engineered to perform under extreme temperatures either it is A691 9 Cr or A691 91 Cr Welded Pipe, often exceeding 500°C, making them well-suited for high-temperature environments. With chromium and molybdenum as key alloying elements, they demonstrate superior resistance to corrosion, stress corrosion cracking, and hydrogen-induced embrittlement—especially in chemically aggressive or seawater environments. The structure allows for faster hydrogen diffusion in the ferritic phase, enhancing high-temperature endurance. Available in nominal sizes from 1/8” NB to 36” NB and outer diameters up to 36”, these pipes comply with global standards such as ASTM A691 and ASME SA691. Every unit undergoes stringent quality validation through hydrostatic, ultrasonic, and eddy current testing methodologies to guarantee uncompromised performance and structural integrity.

Applications & Industry Use

Due to their robustness, dimensional precision, and long-term reliability, alloy steel welded pipes are extensively utilized in industries such as offshore oil exploration, metal processing, petrochemical plants, thermal and nuclear power stations, gas transmission, and heavy-duty chemical manufacturing. Their resistance to both mechanical and chemical stress makes them suitable for pharmaceutical equipment, refineries, and fabrication units. To guarantee optimal performance, every pipe undergoes a comprehensive series of inspections including mechanical property validation, chemical composition analysis, Rockwell hardness testing, intergranular corrosion tests, and third-party audits. These pipes offer a long operational lifespan, making them a preferred choice for mission-critical infrastructure and processing systems.

Alloy Steel Welded Pipes

ASTM A/SA 691 Alloy Steel Welded Pipe, Cr-Mo Welded Pipes, Welded Alloy Steel Pipe

Alloy Steel EFW Pipes

Alloy EFW Pipes, Chromium Molybdenum Steel EFW Pipes, ASTM A691 Chrome-Moly EFW Pipe

Alloy Steel High Pressure Pipes

ASTM A691 Alloy Steel High pressure pipes Supplier, Alloy Steel Boiler Pipes Exporter, ASME SA 691 High Temperature Steel Pipes

Specification :

ASTM A691 / ASME SA691

Dimensions :

ASTM, ASME and API

Outside Diameter :

6-2500mm; WT:1-200mm

Wall thickness :

0.3mm – 50 mm

Size :

1/8"NB TO 30"NB IN

Type :

Seamless / ERW / Welded / Fabricated Pipes

Form :

Round, Square, Rectangular, Oval, Hydraulic Etc

Length :

Single Random, Double Random & Required Length

End :

Plain End, Beveled End, Treaded

Schedules :

SCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, All Schedules

Inspection, Test Reports :

Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, PMI Test Reports, Visual Inspection Reports, Third Party Inspection Reports, NABL Approved Lab Reports, Destructive Test Report, Non Destructive Test Reports

Packing :

Packed in Wooden Boxes, Plastic Bags, Steel Strips Bundled, or as per Customers Requests

Specials :

Sizes and Specifications other than above can be manufactured on request