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Brand: Hyundai Welding
Hyundai Welding SF-71 E71T-1C Flux-Cored Wire
Description
All-position rutile cored wire for CO2 welding of 490 MPa steel
The Hyundai Welding SF-71 is a flux-cored wire classified AWS A5.20 / ASME SFA-5.20 E71T-1C, EN ISO 17632-A T 42 0 P C1 1, JIS Z 3313 T49J 0 T1-1 C A-U and KS D7104 YFW-C50DR. It is designed for welding with 100% CO2 shielding gas, on DC positive polarity, and the manufacturer lists the 1G, 2F, 3G and 4G positions, which covers flat, horizontal fillet, vertical and overhead work.
Hyundai Welding describes good performance and low spatter, with a smooth and stable arc and a fast-freezing slag. The application areas given are shipbuilding, general fabrication and structural fabrication.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / product | Hyundai Welding / SF-71 |
| Process | FCAW, gas-shielded, rutile |
| AWS classification | A5.20 / SFA-5.20 E71T-1C |
| EN ISO classification | 17632-A T 42 0 P C1 1 |
| JIS classification | Z 3313 T49J 0 T1-1 C A-U |
| Shielding gas / polarity | 100% CO2 / DC + |
| Welding positions | 1G, 2F, 3G, 4G |
| Weld metal, typical % (100% CO2) | C 0.04, Si 0.49, Mn 1.29, P 0.013, S 0.011 |
| Yield strength | 548 MPa (79 ksi) |
| Tensile strength | 582 MPa (84 ksi) |
| Elongation | 28% |
| Impact toughness | 75 J at 0 °C; 40 J at -20 °C |
| Current, 1.2 mm | 110-280 A |
| Current, 1.4 mm | 110-280 A |
| Current, 1.6 mm | 120-300 A |
| Packaging | Spool 5, 12.5, 15 and 20 kg; drum 100, 200 and 250 kg |
| Approvals listed | ABS, BV, CCS, CR, DNV, KR, LR, NK, RINA, RS, CWB, CE, TUV |
Where E71T-1C is the right classification
In AWS A5.20, E71T-1C is the general-purpose rutile flux-cored wire used with 100% CO2: the 7 denotes a 70 ksi minimum tensile strength, the 1 means all-position capability, the T that it is a tubular wire, and the 1C the usage group with CO2 gas. Its slag system is fast-freezing, so the pool is supported in the vertical and overhead positions, while the wire is also efficient on flat and horizontal work.
The impact figures on the Hyundai Welding sheet, 75 J at 0 °C and 40 J at -20 °C, are typical for this class and suit ordinary structural service. Where a project specifies a lower test temperature, a nickel-bearing or low-temperature cored wire from the same manufacturer is the better choice, so check the project specification before choosing.
Setting up the wire
Use a gas flow suited to the nozzle and keep shielding free of draughts, since porosity is the first sign of lost gas cover with CO2. Select the 1.2 mm size for thin plate and position welding, and 1.4 or 1.6 mm for thicker flat and horizontal joints. If heat input is raised too far the weld metal toughness falls, so keep to the preheat and interpass limits of the procedure you are qualifying.
Documents and quotation
The Hyundai Welding SF-71 catalog sheet is attached to this page for download. Related consumables are listed in our Flux-Cored Welding Wire category. A published stick-electrode page from the same manufacturer is Hyundai Welding S-7018.1.
For a quotation, send the diameter or size, pack type, quantity and any certificate or approval requirement.
Datasheets & Documents
- Datasheet Hyundai Welding SF-71 product catalog sheet Download
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About brand
Welding consumables from Hyundai Welding, a South Korean maker founded in 1975 and headquartered in Seoul, turn up in pipe shops and fabrication yards wherever procedures call for AWS-classified filler metal. Seven Star LLC lists Hyundai Welding electrodes and wires for carbon steel, chrome-moly, stainless, duplex and nickel alloy work and supplies them to fabricators and maintenance teams in Oman, matched to the classification written in the welding procedure.
Hyundai Welding grades listed on this page
The product names follow a simple pattern: the letters show the consumable type and the number echoes the AWS class.- S- covered electrodes: S-7018.1 (E7018-1), S-7018.W for weathering steel, S-7010.P1 and S-8010.P1 cellulosic pipeline grades
- Chrome-moly: S-8018.B2, S-9018.B3 and S-9015.B9 for P91, plus SC-91B3 flux-cored wire
- Stainless and duplex: S-308L.17, S-309L.17, S-2209.16 and S-2594.16
- Alloy 625: SR-625 electrode and SMT-625 MIG wire
Where these consumables are used
The mix above maps closely to process plant and pipeline work. Cellulosic E7010-P1 and E8010-P1 electrodes are for root and fill passes on line pipe. The B2, B3 and B91 grades serve steam piping, headers and heaters that run hot. E309L joins stainless to carbon steel, E2209 and E2594 cover duplex and super duplex piping, and the 625 fillers are used for overlay and for joining nickel alloys.Ordering Hyundai Welding consumables: what we need
State the Hyundai product name and the AWS classification together, since the procedure qualification record is written against the class. Add the diameter, the quantity in kilograms, the packing you prefer, and the shielding gas for wires. Tell us which test certificate your quality plan asks for, and note any impact temperature, hardness or post-weld heat treatment condition. GCC project specifications often add client approval lists, so mention those as well.
Related products
Frequently Asked Questions
What is the AWS classification of Hyundai Welding SF-71?
AWS A5.20 / ASME SFA-5.20 E71T-1C, with EN ISO 17632-A T 42 0 P C1 1.
Which shielding gas does SF-71 use?
100% CO2 on DC positive polarity.
Which positions are listed?
1G, 2F, 3G and 4G.
What typical impact toughness is stated?
75 J at 0 C and 40 J at -20 C.
Which diameters are listed?
1.2, 1.4 and 1.6 mm.
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