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420 Stainless Steel Round Bar is a martensitic stainless steel known for its high hardness, wear resistance, and good mechanical strength after heat treatment. It offers a practical balance of corrosion resistance and durability for demanding engineering applications.
Widely used in cutting tools, industrial components, valve parts, and mechanical equipment requiring enhanced hardness and abrasion resistance.
420 stainless steel round bar (UNS S42000, EN 1.4021 / 1.4028, SUS420J1 / SUS420J2 martensitic stainless steel rod) is hot-rolled, cold-drawn, or precision centerless ground to deliver exceptionally high mechanical strength, outstanding wear resistance, moderate atmospheric corrosion endurance, and superior hardenability after heat treatment. Engineered specifically for pump shafts, valve stems, surgical instruments, plastic mold inserts, and industrial cutlery, high-quality 420 stainless steel round bar achieves hardness levels up to 48–54 HRC following oil quenching and tempering.
At XQJ Metal, we operate horizontal continuous casting equipment, hydraulic forging presses, multi-pass cold drawing machines, heat-treatment quenching furnaces, and high-precision centerless grinders to manufacture world-class 420 stainless steel round bar products conforming strictly to global engineering standards, including ASTM A276 (stainless steel bars and shapes), ASTM A479, EN 10088-3, and JIS G4303 specifications. We supply full diameter sizes ranging from 3mm to 300mm in round, square, and hexagonal bar profiles, available in annealed (soft), quenched and tempered (Q&T), and centerless ground surface conditions.
| Specification Parameter | 420 Stainless Steel Round Bar Standard Values |
|---|---|
| Alloy Designation & Grade | UNS S42000 / EN 1.4021 (X20Cr13) / EN 1.4028 (X30Cr13) / SUS420J1 / SUS420J2 |
| Chemical Composition | Chromium (Cr) 12.0% – 14.0%, Carbon (C) 0.15% – 0.36%, Manganese (Mn) ≤ 1.0% |
| Diameter Range & Profiles | 3mm to 300mm (Precision small rods to large forged round bars) |
| Annealed Mechanical State | Hardness ≤ 225 HB (Optimized for Swiss CNC lathe machining and milling) |
| Post Heat Treatment Hardness | 48 HRC to 54 HRC (Oil Quenched at 980°C–1040°C + Low Temperature Tempered) |
| Precision Diameter Tolerances | h7, h8, h9, h10, k9 (Centerless Precision Ground Tolerances) |
Selecting between martensitic 420 stainless steel round bar and austenitic 304 stainless steel round bar depends on mechanical strength requirements, post-machining heat treatment, wear exposure, and operating environment:
Pump manufacturers, valve fabricators, and precision machine shops rely on our custom processing capabilities for ready-to-machine 420 stainless steel round bar stock:
Our high-performance 420 stainless steel round bar products are specified across multiple heavy manufacturing sectors globally:
To guarantee zero internal voids, uniform mechanical properties, and 100% metallurgical consistency, XQJ Metal enforces strict Quality Assurance protocols on every 420 stainless steel round bar shipment:
Q1: What hardness can 420 stainless steel round bar achieve after heat treatment?
A: When properly oil-quenched at 980°C–1040°C and tempered, 420 Stainless Steel Round Bar can achieve a surface and core hardness of 48 HRC to 54 HRC depending on carbon content grade (1.4021 vs. 1.4028).
Q2: Can XQJ Metal supply precision centerless ground 420 stainless steel round bars with h8 tolerance?
A: Yes, our precision centerless grinding mills can deliver round bars to tight h7, h8, or h9 diameter tolerances with mirror surface finish (Ra ≤ 0.4µm) tailored for automatic lathe turning.
To request current FOB/CIF price quotes, technical datasheets, or sample rods for 420 stainless steel round bar, Contact Our Technical Sales Team today.
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420 stainless steel round bar contains a higher carbon content than 410, allowing it to achieve higher hardness after heat treatment. While both grades offer good corrosion resistance, 420 is commonly selected for applications requiring improved wear resistance and hardness.
Yes. 420 stainless steel round bar can be heat treated to achieve high hardness and improved wear resistance. The final mechanical properties depend on the specific heat treatment process and application requirements.
420 stainless steel round bar is widely used for knives, industrial blades, valve components, pump shafts, molds, and other parts requiring high hardness and good wear resistance. The appropriate heat treatment condition should be selected according to the intended application.
It offers excellent resistance to seawater corrosion and maintains strength in humid and salt-rich conditions.
No. Strength is achieved through strain hardening rather than heat treatment.
Yes. It provides excellent weldability for structural fabrication.
Yes, it is commonly applied in tanks and pressure equipment.
Yes. It provides higher strength compared with most non-heat-treated aluminum alloys.
Yes. Thickness, width and temper can be adjusted based on project demand.
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