420 Stainless Steel Plate – Premium Martensitic Grade for Maximum Hardness & Surgical-Grade Applications
Meta Description: 420 Stainless Steel Plate – highest hardness up to 55 HRC after heat treatment. Competitive 420 stainless steel plate price from the best 420 stainless steel plate distributor. Download 420 stainless steel data sheet.
Introduction – Why Choose 420 Stainless Steel Plate?
When your application demands maximum hardness, surgical-grade polishability, and cost-effective martensitic strength, 420 Stainless Steel Plate is the ultimate solution. With 0.15–0.40 % carbon, this martensitic 420 stainless steel plate delivers up to 55 HRC after quenched and tempered 420 stainless steel plate heat treatment**, excellent wear resistance, and good corrosion resistance in mild environments — all while remaining 30–40 % cheaper than 440C. Whether you need 420 stainless steel plate for surgical scalpels, industrial shear blades, or plastic injection molds, our mill-direct supply ensures full traceability, rapid delivery, and competitive 420 stainless steel plate price.
[Image Placeholder 1: Close-up of polished and quenched 420 stainless steel plate showing mirror-like surface and mill markings]
Alt text: Polished and Quenched 420 Stainless Steel Plate – Mirror Finish, Hardness up to 55 HRC
Product Overview & Key Benefits
- Martensitic structure – fully magnetic, ideal for sensors & induction heating
- Maximum hardness – up to 55 HRC after 420 stainless steel heat treatment
- Excellent wear resistance – cutting edges, molds, shafts, surgical instruments
- Good corrosion resistance in mild urban & indoor atmospheres
- Surgical-grade polishability – Ra ≤0.1 μm mirror finish
- Cost-effective – 30–40 % cheaper than 440C
- Global supply – best 420 stainless steel plate distributor network to 80+ countries
Chemical Composition of 420 Stainless Steel Plate
| Element | Min % | Max % |
|---|---|---|
| Cr | 12.0 | 14.0 |
| Mn | — | 1.00 |
| Si | — | 1.00 |
| C | 0.15 | 0.40 |
| P | — | 0.04 |
| S | — | 0.03 |
| Fe | Balance | Balance |
High carbon enables maximum hardness; see 420 vs 410 vs 440C stainless steel comparison below.
Mechanical & Physical Properties
Table 1 – Room Temperature Properties (ASTM A240)
| Condition | Yield MPa | Tensile MPa | Elongation % | Hardness HRC |
|---|---|---|---|---|
| Annealed | ≥345 MPa | ≥635 MPa | ≥20 % | ≤22 |
| Quenched & Tempered 300 °C | ≥1000 MPa | ≥1400 MPa | ≥12 % | 52–55 |
| Quenched & Tempered 500 °C | ≥800 MPa | ≥1200 MPa | ≥15 % | 45–50 |
Quench 980–1050 °C, oil/air; temper 200–600 °C.
Table 2 – Physical Properties
| Property | Value |
|---|---|
| Density | 7.7 g/cm³ |
| Thermal Conductivity | 25 W/m·K |
| Thermal Expansion | 10.4 µm/m·K (20–100 °C) |
| Magnetic Permeability | Fully magnetic |
Data extracted from official 420 stainless steel data sheet.
410 vs 410S vs 420 vs 440C Comparison Table
| Feature | 410 | 420 | 440C |
|---|---|---|---|
| Structure | Martensitic | Martensitic | Martensitic |
| Max Temp | 815 °C | 815 °C | 815 °C |
| Hardness (Q&T) | 40–50 HRC | 52–55 HRC | 58–60 HRC |
| Price Ratio | 0.65× | 0.7× | 2.0× |
| Weldability | Fair | Fair | Poor |
| Best Use | Valves, fasteners | Cutlery, surgical | Premium blades |
Choose 420 stainless steel plate for ultimate hardness; choose 410 for cost-effective strength.
Available Sizes & Surface Finishes
| Thickness (mm) | Width (mm) | Length (mm) | Finish |
|---|---|---|---|
| 0.3–3.0 | 1000–1524 | 2000–6000 | 2B, BA |
| 3.0–12.0 | 1250–2000 | 2000–12000 | No.1 |
| 12–50 | 1500–2500 | 2000–12000 | HRAP |
| 50–100 | 1500–3000 | 2000–12000 | Forged |
Custom cut-to-size available.
Detailed Heat Treatment Guide for 420 Stainless Steel
- Annealing: 800–900 °C, air cool → ≤22 HRC
- Quenching: 980–1050 °C, oil or air → ≥40 HRC
- Tempering: 200–400 °C → 52–55 HRC (optimal 300 °C)
- Post-weld: Optional for most services; use 309 or 420 filler
Full 420 stainless steel heat treatment guide downloadable upon request.
Key Applications & Industries
- Surgical instruments – scalpels, forceps, clamps (420 surgical stainless steel plate)
- Cutlery & kitchen knives – blades, cleavers, scissors
- Industrial blades – plastic, paper, textile shears
- Plastic molds – injection, blow, extrusion
- Valves & pump parts – shafts, plungers, seats
- Turbine blades – steam, gas, hydro
- Fasteners & bolts – high-strength, magnetic
- Mining wear plates – quarry liners, crusher parts
- High-carbon 420 stainless steel – premium hardness applications
[Image Placeholder 2: Infographic of 420 stainless steel data sheet + heat treatment curve showing hardness vs tempering temperature]
Alt text: 420 Stainless Steel Data Sheet + Heat Treatment Curve – Hardness vs Tempering Temperature
Why We Are the Best 410 Stainless Steel Plate Distributor
- Mill-direct pricing – 30–40 % cheaper than 440C
- 400 000 t annual martensitic capacity – 5-day lead time
- ISO 9001 & PED certified – EN 10204 3.1 & 3.2 MTC supplied
- In-house quenching & tempering furnaces – hardness up to 55 HRC
- Same-day cutting & polishing – tolerances ±0.2 mm, mirror finish
- Real-time stock portal – 24/7 visibility for 420 stainless steel plate price
[Image Placeholder 3: Real-world application collage showing 420 plates used in surgical scalpels, industrial shear blades, and injection molds]
Alt text: Real Applications of 420 Stainless Steel Plate – Surgical Scalpels, Industrial Shear Blades, Injection Molds
FAQ – 420 Stainless Steel Plate
Q1: What is the maximum hardness of 420 stainless steel plate?
A: Up to 55 HRC after quenched and tempered 420 stainless steel plate at 300 °C.
Q2: What is the difference between 420 vs 410 vs 440C stainless steel?
A: 420 has 0.15–0.40 % C for 52–55 HRC; 410 has ≤0.15 % C for 40–50 HRC; 440C has 0.95–1.20 % C for 58–60 HRC.
Q3: Is 420 stainless steel magnetic?
A: Fully martensitic – ideal for sensors & induction heating.
Q4: Is 420 stainless steel food safe?
A: Yes – 420 surgical stainless steel plate meets FDA/3A for surgical & food contact.
Q5: What is the latest 420 stainless steel plate price?
A: Mill-direct FOB China USD 2.40–2.80/kg depending on carbon surcharge; fixed for 48 h.
Q6: What certificates accompany the shipment?
A: EN 10204 3.1 & 3.2 MTC, ISO 9001, PED 2014/68/EU, and third-party inspection (SGS/TÜV/BV).
Q7: What is the minimum order quantity?
A: One sheet for stock sizes; full container (≈25 t) for mill-direct custom thickness.
Q8: Do you export worldwide?
A: Yes – to 80+ countries including UK, Germany, India, UAE, South Korea, and Australia.
Conclusion + Strong Call-to-Action
Stop paying 440C premiums. Contact the most trusted 420 stainless steel plate supplier today for the latest 420 stainless steel plate price, immediate access to massive 420 stainless steel sheets stock, and same-day cutting of any thickness or finish.