Martensitic Stainless Steel Welding Wire – Grade 420

A. Chemical Composition (wt %, single value = max)

• C: 0.25 – 0.40 Cr: 12.0 – 14.0 Ni ≤ 0.6 Mn ≤ 0.6
• Si: 0.30 – 0.65 P ≤ 0.030 S ≤ 0.030 Mo ≤ 0.75 Cu ≤ 0.75
• Ferrite Number: 0 – 3 FN (fully martensitic after air-cool)

B. Mechanical Properties (as-welded, 3-layer, Ar+2 %O₂)

• Tensile Strength (Rm): ≥ 690 MPa (100 ksi)
• Yield Strength (Rp0.2): ≥ 550 MPa (80 ksi)
• Elongation (A5): ≥ 15 %
• Impact Charpy-V: ≥ 27 J @ –20 °C (–4 °F)
• Hardness: 30 – 35 HRC as-welded | 45 – 50 HRC after PWHT (temper 200 °C / 1 h)

C. Welding Recommendations (Ø1.2 mm, flat)

• Current: 160 – 220 A Voltage: 24 – 28 V Stick-out: 15 mm
• Travel Speed: 25 – 45 cm min⁻¹ Heat Input: 0.6 – 1.0 kJ mm⁻¹
• Inter-pass Temp.: ≤ 250 °C Post-weld: immediate temper 180 – 220 °C to avoid hydrogen crack

D. Diffusion Hydrogen Content

• ≤ 4 ml/100 g weld metal (HD ≤ 4, glycerin method) – low-hydrogen wire keeps crack risk minimal

E. Standards & Approvals

• AWS A5.9 ER420 | ASME SFA-5.9 F-6, A-No. 8 | EN ISO 14343-A G 13 | TÜV 10235 | CE DIN EN 13479 | RoHS & REACH compliant

1 Above-the-Fold Hero

• Headline:
  “ER420 Martensitic Stainless MIG/TIG Wire – High-Strength, Wear-Resistant, 45 HRC After Temper”
• 3-bullet Value Proposition
  • 690 MPa tensile as-welded – ideal for blades & shafts
  • Precision layer-wound, zero tangle at 20 m/min robot feed
  • Vacuum + VCI packaging, 5-year shelf life, lot-traceable MTC 3.1

2 Image / Video Block

1. Macro-photo: spool + close-up of bright wire surface
2. 15-sec silent video: robot MIG welding 420 shaft, shiny ripple, zero spatter
3. Hardness chart: as-welded vs tempered bar graph (30 → 50 HRC)

3 Specs Tab (collapsible)

4 Applications Grid

• Plastic injection screws & barrels
• Food-processing knives / meat-grinder plates
• Pump shafts, valve stems, bearing sleeves
• turbine blade repair overlay
• firearm slides & chokes

5 Certifications Strip

6 FAQ Accordion

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