420 Stainless Steel Pipe is a martensitic grade with Rockwell hardness up to 50 HRC and tensile strength of 620–750 MPa — the preferred choice for cutlery, surgical instruments, valves, and wear-critical industrial systems.
50 HRC Max Hardness
750 MPa Tensile Strength
12–14% Chromium
1450°C Melting Point
ASTM A276 Certified
Seamless & Welded Available
Custom OD / WT / Length
420 stainless steel pipe is not a generic commodity — it is an engineered solution for environments that demand edge retention, surface durability, and controlled corrosion resistance.
Highest Hardness in Stainless
Achieves Rockwell hardness up to 50 HRC after heat treatment — outperforming 304 and 316 grades significantly in wear-critical applications.
Heat-Treatable for Precision
Unique among stainless grades: can be hardened and tempered to meet exact project specs, offering flexibility that austenitic grades cannot.
Surgical-Grade Cleanliness
Known as "surgical steel" — compliant with medical and food-processing hygiene standards when properly finished, ensuring regulatory safety.
Magnetic & Machineable
Inherently magnetic in all conditions — simplifies sorting, MRI-shielded environments, and precision machining operations.
High-Temperature Stability
Melting point of 1,450°C with thermal conductivity of 24.9 W/m·K — maintains structural integrity in demanding thermal cycles.
ASTM A276 Compliance
Fully certified to ASTM A276, A240, and A580 standards — accepted by procurement departments in aerospace, defense, and medical sectors.
All values are per ASTM A276 and standard material certifications. Custom heat treatment conditions available on request.
| Mali | Value / Range | Unit | Maelezo |
|---|---|---|---|
| Uainishaji wa Daraja | AISI 420 / UNS S42000 / 1.4021 | — | Viwango vya ASTM, EN, DIN |
| Nguvu ya mvutano | 620 – 750 | MPa | Hali ya kupoa polepole |
| Nguvu ya mavuno | 345 – 415 | MPa | 0.2% proof stress |
| Rockwell Hardness | Up to 50 | HRC | Heat-treated condition |
| Ugumu wa Brinell | 207 – 235 | HB | Uliokithiriwa |
| Unyumbufu | 20 | % | Min. in 50 mm |
| Moduli ya elastiki | 200 | GPa | — |
| Uzito | 7.75 | g/cm³ | — |
| Melting Point | 1,450 | °C | Approx. |
| Uendeshaji wa joto | 24.9 | W/m·K | Saa 100°C |
| Kiasi cha Chromium | 12 – 14 | % | Min. for stainless classification |
| Kiasi cha kaboni | 0.15 – 0.45 | % | Higher C = higher hardness |
| Viwango vinavyotumika | ASTM A276 / A240 / A580 | — | Mill certs available |
| Aina | OD Range | Unene wa ukuta | Urefu |
|---|---|---|---|
| Mabomba yasiyo na mshono | 6 mm – 219 mm | 1 mm – 20 mm | 1 m – 12 m / Maalum |
| Mabomba yaliyosokotwa | 6 mm – 508 mm | 0.5 mm – 15 mm | 1 m – 12 m / Maalum |
| Round Tube | 3 mm – 100 mm | 0.5 mm – 10 mm | Ukataji maalum unapatikana |
From operating theater instruments to petroleum valve seats, 420 steel pipe serves industries that cannot tolerate failure.
Cutlery & Blades
Edge retention and surface finish make 420 the standard material for high-carbon knife blades, scissors, and culinary tools.
Medical & Surgical
Biocompatible surface, autoclave-safe, and ISO 13485-compatible. Widely specified for surgical instruments, scalpels, and implant tooling.
Valves & Pumps
Hard, wear-resistant seating surfaces in control valves, pump shafts, and fittings operating under pressure or abrasive media.
Oil & Gas
Downhole tools, wellhead components, and valve trim in environments demanding hardness alongside moderate corrosion resistance.
Industrial Gears
Precision gears, spindles, and shafts requiring dimensional stability under heavy load and repeated thermal cycling.
Automotive
Engine components, fuel system parts, and injector bodies benefiting from 420's combination of strength and machinability.
Jewelry & Watches
Scratch-resistant bezels, watch case tubes, and decorative hardware with a polishable, mirror-bright surface finish.
Uhandisi wa jumla
Shafts, bearings, fasteners, and structural tubes where heat-treatable stainless steel provides a cost-effective solution.
| Mali | 420 SS | 304 SS |
|---|---|---|
| Max Hardness (HRC) | 50 | ~20 (work-hardened) |
| Heat Treatable | Ndio | No |
| Nguvu ya mvutano | 620–750 MPa | 515–620 MPa |
| Ustahimilivu dhidi ya kutu | Moderate | Excellent |
| Magnetic | Ndio | No |
| Weldability | Limited (pre/post heat) | Excellent |
| Best For | Hardness & wear | General use |
Udhibiti kamili wa bidhaa unaturuhusu kuhakikisha wateja wetu wanapata bei, ubora na huduma bora. Wasiliana nasi kwa nukuu ya bure, JBLSTEEL itatoa suluhisho sahihi kwa mradi wako.
