AWS Class ER80S-B6 MIG & TIG
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ER80S-B6 TIG Filler Rod & MIG Wire Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001- and ISO 14001-certified Mumbai-based stockist and supplier of ER80S-B6 chrome-moly welding wire. We provide these wires classified under AWS A5.28 / ASME SFA-5.28.
ER80S-B6 wire consists of 4.50–6.00% Cr and 0.45–0.65% Mo, with a minimum tensile strength of 550 MPa (80 ksi) and yield of 470 MPa (68 ksi) after mandatory PWHT at 740–760°C. That 4.50–6.00% Cr chromium level delivers sulphidation resistance at equal temperatures in high-sulphur crude oil service, and resists hot hydrogen attack beyond the Nelson curve limits of lower CrMo grades. The air-hardening martensitic weld deposit demands strict preheat of min 175°C (350°F) and PWHT to temper the microstructure below 225 HV before any service loading. Also referred to as 5Cr-0.5Mo TIG wire, P5 welding wire, ER502 (its former AWS A5.9-93 designation), Alloy 502 filler wire, or chrome-moly 5Cr filler rod, ER80S-B6 is a low-alloy steel solid wire built for welding 5% chromium steel piping, tubing, and castings in refinery and petrochemical high-temperature service.
ER80S-B6 TIG rods come in 1.6, 2.0, 2.4, and 3.2 mm diameters; MIG wire in 0.9, 1.2, and 1.6 mm spools (D200 and D300). Nicorex Alloys stocks matching consumable sets across GTAW, GMAW, and SMAW processes for a full 5Cr-0.5Mo project supply. Every batch ships with MTC 3.1 per EN 10204.
ER80S-B6 Welding Wire Specifications
The specifications for ER80S-B6 welding wire, along with its UNS number, shielding gas and AWS classification, are listed below:
| AWS Classification | ER80S-B6 (AWS A5.23) |
|---|---|
| UNS Number | S50280 |
| Welding Processes | GTAW (TIG), GMAW (MIG), SAW |
| Polarity — GTAW / GMAW | DCEN / DCEP |
| Shielding Gas | Argon (GTAW); CO₂, 75Ar/25CO₂, 98Ar/2O₂ (GMAW) |
| TIG Rod Diameters / Length | 1.6, 2.0, 2.4, 3.2 mm / 914–1000 mm |
| MIG Wire Diameters | 0.9, 1.2, 1.6 mm |
AWS Classification Explained: What Does ER80S-B6 Mean?
The table below explains the meaning of each component in the ER80S-B6 designation, helping identify its welding filler classification and alloy type:
| Designation | Meaning |
|---|---|
| ER | Electrode/Rod (bare welding wire) |
| 80 | Minimum tensile strength 80 ksi (≈550 MPa) after PWHT |
| S | Solid welding wire |
| B6 | 5Cr–0.5Mo alloy composition (Cr-Mo B-series classification) |
The filler metal was formerly designated ER502 under AWS A5.9-93; after Cr-Mo wires moved to AWS A5.28, ER502 was redesignated as ER80S-B6.
Chemical Composition of ER80S-B6 Weld Deposit (%)
The table below shows the chemical composition of the ER80S-B6 weld deposit and the percentage of each element:
| Specification | Carbon (C) | Manganese (Mn) | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) | Nickel (Ni) | Phosphorus (P) | Sulphur (S) | Copper (Cu) |
|---|---|---|---|---|---|---|---|---|---|
| AWS A5.28 Req. (%) | 0.10 max | 0.40–0.70 | 0.50 max | 4.50–6.00 | 0.45–0.65 | 0.60 max | 0.025 max | 0.025 max | 0.35 max |
Values represent weld deposit analysis per AWS A5.28. Actual weld metal composition varies with dilution, pass count, and parameters.
All-Weld-Metal Mechanical Properties of ER80S-B6
The mechanical properties of ER80S-B6 welding wire, including tensile strength, yield strength and elongation, are listed below:
| Specification | Tensile Strength | Yield Strength (0.2%) | Elongation (%) | Charpy V-Notch (+20°C) |
|---|---|---|---|---|
| AWS A5.28 Min | 550 MPa (80 ksi) | 470 MPa (68 ksi) | 19% | Not specified |
As-welded hardness exceeds 350 HV (martensitic). PWHT tempers below 225 HV, restoring ductility and toughness. Placing 5Cr-0.5Mo welds into service without PWHT violates ASME B31.3.
Base Metal Compatibility and ASME Section IX Data for ER80S-B6
ER80S-B6 is air-hardening. Strict preheat, interpass, and PWHT control is critical to prevent hydrogen-induced cracking.
| Base Metal Spec | Grade | UNS | Product Form |
|---|---|---|---|
| SA-335 / A335 | P5, P5b | K41545 / K51545 | Seamless pipe |
| SA-213 / A213 | T5, T5b | K41545 / K51545 | Seamless tube |
| SA-182 / A182 | F5, F5a | K41545 | Forgings (flanges, fittings, valves) |
| SA-217 / A217 | C5 | J42045 | Castings |
Recommended Welding Parameters for ER80S-B6 TIG & MIG Wire
ER80S-B6 is air-hardening. Strict preheat, interpass, and PWHT control is critical to prevent hydrogen-induced cracking.
GTAW (TIG) Parameters
| Wire Diameter | Amperage (A) | Voltage (V) | Shielding Gas |
|---|---|---|---|
| 1.6 mm (1/16″) | 50–120 | 7–13 | 100% Argon |
| 2.4 mm (3/32″) | 120–200 | 10–16 | 100% Argon |
| 3.2 mm (1/8″) | 150–220 | 12–18 | 100% Argon |
GMAW (MIG) Short-Circuit Parameters
| Wire Diameter | Amperage (A) | Voltage (V) | Shielding Gas |
|---|---|---|---|
| 0.9 mm (0.035″) | 90–160 | 14–20 | CO₂ |
| 1.2 mm (0.045″) | 120–200 | 16–20 | CO₂ or 75Ar/25CO₂ |
GMAW (MIG) Spray Transfer Parameters
| Wire Diameter | Amperage (A) | Voltage (V) | Shielding Gas |
|---|---|---|---|
| 0.9 mm (0.035″) | 180–230 | 25–28 | 98Ar/2O₂ |
| 1.2 mm (0.045″) | 250–350 | 25–30 | 75Ar/25CO₂ |
| 1.6 mm (1/16″) | 280–400 | 26–36 | 75Ar/25CO₂ |
SAW Parameters (EB6 per AWS A5.23):
| Wire Diameter | Amperage (A) | Voltage (V) | Flux Type |
|---|---|---|---|
| 2.4 mm (3/32″) | 250–400 | 28–32 | Basic agglomerated (e.g., Marathon 543) |
| 3.2 mm (1/8″) | 400–600 | 30–34 | Basic agglomerated |
Use a minimum preheat of 150°C (300°F) and keep the interpass temperature between 150°C and 300°C. After welding, let the joint cool slowly under insulation, then perform mandatory PWHT at 620–680°C.
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Industrial Welding Applications of ER80S-B6 (5Cr-0.5Mo) Filler Wire
ER80S-B6 filler wire is strong, resists corrosion very well, and works reliably in harsh, chloride-rich environments.
- Petroleum Refining: Used for welding heater tubes, transfer lines, and piping in crude and vacuum units.
- Hydroprocessing: Used to weld reactor shells and heat exchangers.
- Hot Hydrogen Service: Applied to equipment operating in hot hydrogen environments.
- High-Temperature Steam Service: Used for steam piping operating in the 480–595°C temperature range.
- Repair Welding: Used for repair and maintenance welding of 5Cr-0.5Mo castings such as SA-217 Grade C5 during refinery turnarounds.
Storage and Handling of ER80S-B6 Welding Wire
Store in original sealed packaging at 15–30°C, humidity below 50% RH. Low-hydrogen practice is critical because 5Cr-0.5Mo deposits are martensitic and susceptible to hydrogen cracking. Return partially used MIG spools to sealed packaging or heated cabinets at 40–50°C. Use the open wire within 8 hours.
Available Forms, Diameters and Packaging of ER80S-B6 Filler Wire
Nicorex Alloys stocks ER80S-B6 in the forms, diameters, and packaging mentioned in the table below:
| Form | Diameters | Packaging |
|---|---|---|
| TIG Rod (GTAW) | 1.6, 2.0, 2.4, 3.2 mm | 5 kg tubes; 914 mm (36″) and 1000 mm cut lengths |
| MIG Spool (GMAW) | 0.9, 1.2, 1.6 mm | D200 spool (12.5 kg), D300 spool (15 kg) |
| SAW Wire (EB6) | 2.4, 3.2 mm | 25 kg coils |
All wire ships with MTC 3.1 per EN 10204. Matching sets (ER80S-B6 wire + E8018-B6 electrode) are available for a complete 5Cr-0.5Mo project supply.
How to Order ER80S-B6 Welding Wire from Nicorex Alloys
To order ER80S-B6 wire, follow these 10 important instructions:
- AWS Classification — ER80S-B6 per AWS A5.28 / ASME SFA-5.28
- Diameter — GTAW: 1.6 mm / 2.4 mm / 3.2 mm; GMAW: 0.9 mm / 1.2 mm
- Quantity — GTAW: specify kg or packs; GMAW: specify spool count
- Testing / Certification — MTC 3.1/3.2; Hardness Report; PWHT record; TPI
- Base Metal — ASTM A335 P5 / A182 F5 / A217 C5
- Material Grade — 5Cr-0.5Mo; UNS S50280; W.Nr. 1.7362; EN ISO 21952-A: W CrMo5
- Third-Party Approvals — TÜV / BV / IBR (Indian Boiler Regulations)
- Applicable Code — ASME VIII, IX, B31.1, B31.3
- Delivery — Domestic
- Remarks — Confirm 5Cr base metal; creep / high-temp service
Frequently Asked Questions
What is the difference between ER80S-B6 and ER502?
They are the same product. ER502 was the classification under AWS A5.9-93. When AWS moved CrMo bare wires to A5.28, ER502 became ER80S-B6. Old purchase orders referencing ER502 denote this identical wire.
Why is 5Cr needed instead of 1.25Cr or 2.25Cr for Refinery Crude Service?
5% chromium resists naphthenic acid corrosion and sulphidation far better than lower CrMo grades. Corrosion rates on 1.25Cr can be 5–10 times higher than 5Cr at the same temperature.
What PWHT Temperature is required for ER80S-B6 Welds?
PWHT at 740–760°C (1365–1400°F) is mandatory, held 1 hour per 25 mm thickness (minimum 30 minutes). As-welded hardness exceeds 350 HV. PWHT temperatures below 225 HV for safe service.
What Spool Sizes and TIG Rod Lengths are available for ER80S-B6?
TIG rods are 914 mm and 1000 mm in length in 5 kg tubes.MIG wire is supplied on D200 spools (12.5 kg) and D300 spools (15 kg), while SAW wire (EB6) is supplied in 25 kg coils. All forms ship with MTC 3.1.
When should ER80S-B6 Welding Wire not be used?
Do not use ER80S-B6 for 1.25Cr-0.5Mo service, for 2.25Cr-1Mo service, for 9Cr-1Mo or P91 service, without PWHT, for sustained service above 595°C, or for 5Cr-to-stainless dissimilar joints.