ER307Si is a solid austenitic stainless steel wire designed for MIG (GMAW) and TIG (GTAW) welding. The high
manganese content (4.5-7.5%) provides exceptional resistance to hot cracking, while the added silicon improves arc
stability, puddle fluidity, and bead appearance.
· Work-Hardening Characteristics: Weld metal exhibits strain-hardening properties up to ~400 HB under heavy
impact or severe friction.
· Dissimilar Steel Joining: Excellent for joining austenitic stainless steel to carbon steel, low-alloy steel, armor
plate, or tool steel.
· Manganese Steel Repair: Ideal for cladding and buffer layers on 13% Mn steel components before hardfacing.
Key Applications:
• Welding armor steel, high-carbon steel, tool steel, and manganese steel (13% Mn steel).
• Joining dissimilar steels (e.g., austenitic stainless steel to mild/low-alloy carbon steel).
• Buffer layer/underlayment before hardfacing or wear-resistant cladding.
2. CHEMICAL COMPOSITION OF SOLID WIRE (WT %)
| Element | C | Si | Mn | Cr | Ni | Mo | P | S | Cu |
| AWS A5.9 Spec | ≤ 0.13 | 0.65 – 1.00 | 4.50 – 7.50 | 19.5 – 22.0 | 8.0 – 10.5 | ≤ 0.75 | ≤ 0.030 | ≤ 0.030 | ≤ 0.75 |
| Typical Value | 0.08 | 0.85 | 5.80 | 20.2 | 9.20 | 0.20 | 0.018 | 0.008 | 0.12 |
3. Mechanical Properties of All-Weld Metal
| Property | Tensile Strength Rm (MPa) | Yield Strength Rp0.2 (MPa) | Elongation A5 (%) | Impact Energy KV (J) at +20°C | Hardness (As-Welded / Work-Hardened) |
| Standard Requirement | ≥ 590 | ≥ 380 | ≥ 35 | - | - |
| Typical Values | 630 – 650 | 420 – 450 | 40 – 42 | > 80 J | ~200 HB / ~400 HB |
4. RECOMMENDED WELDING PARAMETERS & SHIELDING GAS
MIG/MAG
| Diameter (mm) | Current (A) | Voltage (V) | Wire feed speed (m/min) | Deposition rate (kg/h) |
|---|---|---|---|---|
| 0.8 | 55-160 | 15-24 | 4.0-17.0 | 1.0-4.1 |
| 0.9 | 65-220 | 15-28 | 3.5-18.0 | 1.1-5.4 |
| 1.0 | 80-240 | 15-28 | 4.0-16.0 | 1.5-6.0 |
| 1.2 | 100-300 | 15-28 | 3.0-14.0 | 1.6-7.5 |
| 1.6 | 230-375 | 23-31 | 5.5-9.0 | 5.2-8.6 |
4.1 Welding Positions
All positions (flat, horizontal, vertical, overhead)
5. Usage Notes
- Pre-weld cleaning: thoroughly remove rust, moisture, oil, and dirt from the welding area; use a stainless-steel dedicated wire brush.
- Interpass temperature: recommended ≤150°C.
- Wind protection: when welding outdoors with wind speed >1.5 m/s, use wind shielding to prevent porosity.
- Arc length: short arc, spray arc, or pulsed arc recommended; pulsed arc preferred.
- Polarity: MIG uses DC+ (electrode positive)
