Hyundai SC-91B3 E91T1-B3C Chrome-Moly Flux-Cored Wire
The Hyundai SC-91B3 is a rutile-type flux-cored wire for gas-shielded arc welding of 2.25%Cr-1%Mo heat-resistant steel. Classified to AWS A5.29 / ASME SFA-5.29 E91T1-B3C and EN ISO 17634-B T62 T1-1C1-2C1M, it is designed to run with 100% CO2 shielding gas and gives a stable arc with a low spatter level in the flat, horizontal fillet, vertical and overhead positions (1G, 2F, 3G and 4G). Hyundai Welding lists the petrochemical industry and pressure vessels as its main application areas. Seven Star LLC supplies the Hyundai SC-91B3 to fabricators, refinery maintenance teams and power plant contractors in Oman and across the GCC, and the manufacturer datasheet is attached to this page for download.
Overview of the Hyundai SC-91B3
Chrome-moly steels such as 2.25Cr-1Mo (commonly specified as ASTM A387 Grade 22 plate, A335 P22 pipe or A182 F22 forgings) are chosen where creep strength and resistance to hydrogen attack at elevated temperature matter. Welding them productively in the shop or on site calls for a filler whose deposit closely matches the base metal chemistry and which responds correctly to post-weld heat treatment. The Hyundai SC-91B3 meets that need with a deposit containing typically 2.30% chromium and 0.98% molybdenum, making it a matching consumable for the 2.25Cr-1Mo family.
Because it is a flux-cored wire rather than a stick electrode, the Hyundai SC-91B3 gives continuous welding, higher deposition and fewer stop-starts than manual metal arc welding. For long seams on pressure vessel shells, nozzle reinforcement and header fabrication, this translates directly into shorter arc-on time per joint. The all-position capability listed on the datasheet also allows the same wire to be used for pipe and fixed-position work.
Key Features
- AWS A5.29 E91T1-B3C classification for 2.25%Cr-1.0%Mo heat-resistant steel.
- Designed for welding with 100% CO2 shielding gas on DC electrode positive (DC+).
- Stable arc and low spatter level, as stated by Hyundai Welding.
- All-position use: 1G, 2F, 3G and 4G are marked on the datasheet.
- Typical all-weld-metal tensile strength of 728 MPa after PWHT at 690 ± 15 °C for 1 hour.
- Available in 1.2, 1.4 and 1.6 mm diameters on 5, 12.5 and 15 kg spools.
Chemical Composition and Mechanical Properties
The table lists the typical chemical composition of all-weld metal for the Hyundai SC-91B3 welded under 100% CO2, as printed on the manufacturer datasheet.
| Element | C | Si | Mn | P | S | Cr | Mo |
|---|---|---|---|---|---|---|---|
| wt% | 0.06 | 0.47 | 0.63 | 0.015 | 0.009 | 2.30 | 0.98 |
Typical mechanical properties of the all-weld metal were measured after post-weld heat treatment at 690 ± 15 °C for 1 hour:
| Property | Typical value |
|---|---|
| Yield strength | 640 MPa (93 ksi) |
| Tensile strength | 728 MPa (106 ksi) |
| Elongation | 20% |
| Shielding gas | 100% CO2 |
| Polarity | DC+ |
These are typical values from the datasheet, not guaranteed minimums. Project acceptance should always be based on the applicable code and a qualified welding procedure.
Wire Sizes, Current Ranges and Packaging
| Wire diameter | Welding current |
|---|---|
| 1.2 mm (0.045 in) | 120 to 300 A |
| 1.4 mm (0.052 in) | 200 to 350 A |
| 1.6 mm (1/16 in) | 200 to 400 A |
The Hyundai SC-91B3 is packed on spools of 5 kg (11 lbs), 12.5 kg (27.6 lbs) and 15 kg (33 lbs). The 1.2 mm size is the usual choice for positional and pipe welding, while 1.4 and 1.6 mm suit flat and horizontal work where higher currents and deposition rates are wanted.
Industrial Applications
In Oman, 2.25Cr-1Mo steel appears in refinery hydroprocessing units, reformer and heater piping, high-temperature steam lines in power and desalination plants, and in pressure vessels built for petrochemical service. The Hyundai SC-91B3 is aimed squarely at these applications. Typical uses include:
- Shop fabrication of chrome-moly pressure vessels, drums and heat exchanger shells.
- Steam and process piping in P22-type material for power stations and refineries.
- Repair and modification work during shutdowns at refinery and petrochemical sites in Sohar, Duqm and Muscat.
- Fill and cap passes on thick sections where productivity matters, often after a root pass made by GTAW.
General Welding Guidance for 2.25Cr-1Mo Steel
The following notes are general welding knowledge for this steel family and are not taken from the Hyundai datasheet. Chrome-moly steels are hardenable, so preheat and interpass temperature control are normally required by the governing code (for example ASME B31.3, ASME Section VIII or ASME Section I) to limit hardness and the risk of hydrogen cracking. Post-weld heat treatment is typically mandatory above modest thicknesses, which is why the datasheet reports mechanical properties in the PWHT condition. Flux-cored wire should be kept dry and protected from contamination, spools should be returned to sealed packaging when not in use, and welders should hold a consistent stick-out to keep the arc stable with CO2 shielding.
A welding procedure specification qualified on the actual base material, thickness and heat treatment cycle remains the basis for production welding. Seven Star LLC can share the Hyundai SC-91B3 datasheet with your welding engineer so the wire can be included in procedure qualification records.
Why Choose the Hyundai SC-91B3
Hyundai Welding is a long-established Korean manufacturer of welding consumables with a wide range of flux-cored, solid and stick products. For contractors who already use Hyundai wires on carbon steel, adding the Hyundai SC-91B3 keeps the same feeding behaviour and packaging format on chrome-moly jobs. The matching 2.25Cr-1Mo deposit, CO2 shielding (generally lower in cost and easier to source than mixed gases) and all-position capability make it a practical consumable for both shop and field use.
Related Products
For carbon steel MIG work, see the Lincoln Electric SuperArc L-59 ER70S-6 Solid MIG Welding Wire. For submerged arc welding of carbon steel, the LongTeng EL8 Carbon Steel Submerged Arc Welding Wire is available, and the Lincoln Electric Power Wave S500 is an example of a multi-process power source suitable for flux-cored welding. Browse more wires in our Flux-Cored Welding Wire range.
Order the Hyundai SC-91B3 from Seven Star LLC
Send Seven Star LLC your required diameter, spool size and quantity for the Hyundai SC-91B3, together with any project specification or inspection requirements. Our team in Muscat will review the request, provide the manufacturer datasheet and certificates as issued by the producer, and arrange delivery to your workshop or site in Oman or elsewhere in the GCC. Seven Star LLC supplies welding consumables on request with engineering support in Muscat.
- datasheet Hyundai Welding SC-91B3 datasheet Download
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