420 Stainless Steel Fittings – Premium Martensitic, High-Hardness Solutions for Medical and Industrial Applications
Meta Description: Discover 420 stainless steel fittings with up to 58 HRC hardness, perfect for medical, food, and industrial applications. High-performance, wear-resistant, and mirror-polished options available.
Introduction
420 Stainless Steel Fittings are renowned for their ability to achieve exceptional hardness, up to 58 HRC, making them one of the hardest martensitic stainless steel fittings available in the market. These fittings are designed for high-performance applications across industries, particularly where wear resistance and sharp edges are crucial. From surgical instruments to industrial knives, 420 stainless steel fittings deliver the precision, strength, and reliability required for the most demanding environments.
One of the key advantages of 420 stainless steel fittings is their quenched and tempered nature, which allows them to reach maximum hardness without sacrificing strength or ductility. Whether used in medical devices, high-pressure hydraulics, turbine blades, or food processing, 420 stainless steel fittings offer superior wear and corrosion resistance compared to other martensitic grades like 410.
The versatility of 420 stainless steel fittings makes them a go-to material for surgical, automotive, food, and pharmaceutical industries. With the ability to handle high temperatures and pressures, they excel in environments where high strength and resistance to wear are non-negotiable. Additionally, their ability to be mirror polished makes them perfect for aesthetic applications such as medical instruments and cutting blades.
As the No.1 supplier of 420 stainless steel fittings, we offer the best quality, competitive pricing, and fastest global delivery. With our extensive inventory and advanced machining facilities, we can fulfill both small and large batch orders of 420 fittings to meet your specific needs.
Product Overview & Premium Advantages
- Martensitic Strength: 420 stainless steel fittings are martensitic, which allows them to be hardened through heat treatment (up to 58 HRC), providing superior wear resistance, edge retention, and high hardness.
- Excellent Polishability: These fittings can be mirror polished, making them ideal for aesthetic applications such as surgical instruments or food industry components.
- High Corrosion Resistance: 420 stainless steel offers good corrosion resistance in mild to moderately corrosive environments, including chloride-based and food processing conditions.
- High-Temperature Performance: 420 fittings can perform effectively at high temperatures up to 400°C, making them suitable for applications involving elevated heat.
- Weldability: While not as weldable as 420J2 or 304, 420 fittings can be welded using appropriate filler metals and post-weld heat treatment (PWHT) to maintain mechanical properties.
- Cost-Effective Upgrade: Compared to higher-alloyed materials like 440C and 17-4PH, 420 stainless steel fittings offer an affordable alternative without compromising on performance.
These 420 stainless steel fittings are ideal for a variety of industries, including medical devices, hydraulic systems, marine, petrochemical, and industrial applications, where high strength and corrosion resistance are essential.
Chemical Composition
| Grade | Carbon (C) | Chromium (Cr) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) | Nickel (Ni) | Iron (Fe) |
|---|---|---|---|---|---|---|---|---|
| 420 | ≤0.15 | 12.0–14.0 | 0.60–1.00 | ≤1.00 | ≤0.04 | ≤0.03 | ≤0.75 | Balance |
| 420J1 | ≤0.12 | 12.0–14.0 | 0.60–1.00 | ≤1.00 | ≤0.04 | ≤0.03 | ≤0.75 | Balance |
| 420J2 | ≤0.12 | 12.0–14.0 | 0.60–1.00 | ≤1.00 | ≤0.04 | ≤0.03 | ≤0.75 | Balance |
420 stainless steel contains high carbon content, which enables it to reach high hardness levels when quenched and tempered. The addition of 12.0–14.0% chromium provides the necessary corrosion resistance for various industrial applications.
Mechanical Properties
| Property | Annealed | Quenched & Tempered |
|---|---|---|
| Tensile Strength (MPa) | 500–750 | 1500–2000 |
| Yield Strength (MPa) | 250–400 | 1200–1700 |
| Elongation (%) | ≥20 | ≥12 |
| Hardness (HRC) | 20–30 | 48–58 |
420 stainless steel fittings provide exceptional strength and hardness after quenching and tempering, making them ideal for high-stress environments. They achieve tensile strength of up to 2000 MPa and hardness values as high as 58 HRC, ensuring superior wear resistance and edge retention.
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 7.75 |
| Thermal Expansion (10⁻⁶/°C) | 10.5 |
| Thermal Conductivity (W/m·K) | 24.0 |
| Magnetic | Yes |
420 stainless steel fittings are fully magnetic, which makes them suitable for applications where magnetic properties are required. The material also exhibits moderate thermal conductivity and thermal expansion, making it suitable for applications involving high temperatures.
420 vs 410 vs 420J2 vs 440C vs 17-4PH Fittings Comparison
| Property | 420 Stainless Steel | 410 Stainless Steel | 420J2 Stainless Steel | 440C Stainless Steel | 17-4PH Stainless Steel |
|---|---|---|---|---|---|
| Hardness (HRC) | 48–58 | 22–55 | 45–55 | 55–60 | 40–45 |
| Wear Resistance | Excellent | Moderate | Excellent | Outstanding | Very Good |
| Corrosion Resistance | Moderate | Moderate | Good | Moderate | Excellent |
| Cost | Low | Low | Moderate | High | High |
| Polishability | Excellent | Good | Excellent | Excellent | Moderate |
420 stainless steel fittings provide superior wear resistance compared to 410 and 420J2. When compared to 440C and 17-4PH, 420 is a cost-effective option while still providing excellent hardness and wear resistance.
Available Types & Specifications
| Type | Size (NPS) | Wall (Sch) | Pressure Rating | Standards | Surface Finish |
|---|---|---|---|---|---|
| Buttweld Fittings | 1/2″–48″ | Sch 10S–XXS | 2000# to 9000# | ASTM A403 WP420 | Pickled, Bright Annealed, Polished |
| Threaded & Socket Weld | 1/8″–4″ | Sch 10S–XXS | 2000# to 6000# | ASME B16.11, MSS SP-43 |
We offer 420 stainless steel fittings in a range of sizes and pressure ratings, including buttweld, threaded, and socket weld types. These fittings are available in 1/2″ to 48″ NPS (buttweld) and 1/8″ to 4″ NPS (forged), with pressure ratings ranging from 2000# to 9000#.
Complete Heat Treatment Guide for 420 Stainless Steel Fittings
To achieve the maximum hardness of 58 HRC, 420 stainless steel fittings undergo a heat treatment process that includes hardening at 980–1050°C, followed by tempering at 150–400°C. Optional cryogenic treatment can further enhance wear resistance and dimensional stability.
Major Applications
- Surgical Instruments (scalpels, scissors, tweezers)
- Dental Instruments (drills, cutters)
- High-Pressure Hydraulic Fittings
- Pump & Valve Trim
- Plastic Mold Cooling Systems
- Food & Pharmaceutical Valve Components
- Marine Propeller Shaft Couplings
- Shear Blades & Industrial Knives
- Oilfield Downhole Tools
Product Images
420 Stainless Steel Fittings – Premium Martensitic, High-Hardness Solutions for Medical and Industrial Applications
Large Inventory of 420 Stainless Steel Fittings – Ready for Immediate Delivery
420 Stainless Steel Fittings in Real-World Applications – Medical Instruments and Industrial Equipment
Why We Are the Best 420 Stainless Steel Fittings Distributor
- Largest Global Stock of 420 Stainless Steel Fittings
- In-house Heat Treatment & Cryogenic Line
- 100% PMI, Ultrasonic Testing, & Hardness Testing
- Custom Small-Batch Medical Fittings
- Fastest Delivery & Competitive Pricing
Packaging & Quality Assurance
Our 420 stainless steel fittings are carefully packaged in plastic sleeves, wooden cases, and come with a full certification package for quality assurance.
FAQ Section
-
Maximum hardness of 420 stainless steel fittings?
Up to 58 HRC after quenched and tempered. -
Difference between 420, 420J2, and 440C fittings?
420J2 offers better weldability, while 440C provides higher hardness. -
Is 420 fittings food-safe and medical-grade?
Yes, 420 stainless steel is FDA-approved for use in medical and food applications. -
Can 420 fittings reach 58 HRC?
Yes, 420 stainless steel fittings can be quenched and tempered to achieve 58 HRC hardness. -
Recommended welding & PWHT for 420 fittings?
Use ER420 filler metal and perform post-weld heat treatment (PWHT) for optimal mechanical properties. -
Corrosion resistance in chloride environments?
420 fittings provide good corrosion resistance in mild chloride environments. -
NACE MR0175 / ISO 15156 compliance?
420 fittings comply with NACE MR0175 for sour service. -
Minimum order quantity for 3000# socket weld 420 fittings?
We offer flexible MOQs based on your requirements. -
Lead time for polished buttweld 420 elbows?
Lead time is typically 7-10 days for polished buttweld 420 elbows. -
Can 420 fittings be used in seawater?
420 fittings are corrosion-resistant in seawater with proper care and maintenance.
Conclusion + Urgent Call-to-Action
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