14Cr17Ni2 stainless steel, also known as X20Cr13 or SUS420J2, is a martensitic stainless steel engineered for high-strength, wear-resistant, and moderate corrosion-resistant applications. With chromium content of 16–18% and nickel 1–2%, it achieves excellent hardness, tensile strength, and dimensional stability after heat treatment.
Compared with 304 or 316 austenitic steels, 14Cr17Ni2 can be hardened by quenching and tempering, making it ideal for industrial shafts, knife blades, valves, bearings, and precision tools. Its performance in high-wear and moderately corrosive environments ensures long-term reliability.
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Chemical Composition (%)
| Element | Content |
|---|---|
| C | 0.12 – 0.20 |
| Cr | 16.0 – 18.0 |
| Ni | 1.0 – 2.0 |
| Mn | ≤ 1.0 |
| Si | ≤ 1.0 |
| P | ≤ 0.035 |
| S | ≤ 0.03 |
Mechanical Properties (After Heat Treatment)
| Property | Value |
|---|---|
| Tensile Strength | 700 – 950 MPa |
| Yield Strength | ≥ 450 MPa |
| Elongation | ≥ 12% |
| Hardness | 45 – 50 HRC |
Key Features
High hardness and wear resistance after quenching and tempering
Moderate corrosion resistance for industrial applications
Excellent dimensional stability
Heat treatable for customized mechanical properties
Suitable for precision machining and tooling
Heat Treatment Guidelines
Quenching: 1000 – 1050°C, oil or water cooling
Tempering: 150 – 200°C for general mechanical use; higher temperatures for wear resistance
Provides high strength, hardness, and corrosion resistance
Applications
Industrial shafts, axles, and gears
Valves and valve components
Bearings and bushings
Knife blades and cutting tools
Automotive and machinery components
Precision instruments
Physical Properties
| Property | Value |
|---|---|
| Density | 7.75 – 7.85 g/cm³ |
| Melting Point | 1400 – 1450°C |
| Thermal Conductivity | 24 W/m·K |
| Modulus of Elasticity | 200 GPa |
| Coefficient of Thermal Expansion | 10.8 ×10⁻⁶ /°C |
Corrosion Resistance
Moderate resistance to oxidation, rust, and mild chemicals
Better corrosion resistance than carbon steel, but less than austenitic stainless steel
Suitable for dry and mildly corrosive environments
Welding & Fabrication
Weldable using TIG, MIG, and arc welding
Preheating may be required to avoid cracking
Post-weld heat treatment recommended for high hardness components
International Equivalent Standards
| China GB | ASTM / AISI | EN / DIN | JIS | ISO |
|---|---|---|---|---|
| 14Cr17Ni2 | 420 / 420C | X20Cr13 / 1.4021 | SUS420J2 | 683-17 |
Technology Comparison Table
| Feature | 14Cr17Ni2 (420C) | 304 Stainless Steel | 316 Stainless Steel |
|---|---|---|---|
| Type | Martensitic | Austenitic | Austenitic |
| Hardness (HRC) | 45–50 | 70 HB | 95 HB |
| Corrosion Resistance | Moderate | High | Higher |
| Heat Treatable | Yes | No | No |
| Applications | Shafts, Blades, Valves | Tanks, Pipes | Chemical equipment |
How 14Cr17Ni2 Stainless Steel Enhances Industrial Machinery Performance
Martensitic stainless steels like 14Cr17Ni2 provide high wear resistance, reducing maintenance costs.
Heat treatment allows customization of hardness for precision engineering.
Titanium-stabilized grades (if used) prevent grain boundary cracking under thermal stress.
Widely applied in valves, bearings, automotive shafts, and cutting tools, ensuring operational reliability even in moderately corrosive environments.
Case Study
Industrial Valves: Shafts and stems made of 14Cr17Ni2 resist wear and moderate corrosion in chemical plants.
Knife Blades: Hardness 45–50 HRC ensures sharp cutting edges with long service life.
Automotive Shafts: Heat treated 14Cr17Ni2 ensures precise tolerances and durability.
FAQ
1️⃣ What is 14Cr17Ni2 stainless steel?
14Cr17Ni2 is a martensitic stainless steel with moderate chromium (16–18%) and low nickel (1–2%), offering high hardness, good corrosion resistance, and excellent mechanical strength after heat treatment. It is widely used in industrial, automotive, and tooling applications.
2️⃣ What are the international equivalents of 14Cr17Ni2?
ASTM / AISI: 420 / 420C
EN / DIN: X20Cr13 / 1.4021
JIS: SUS420J2
ISO: 683-17
3️⃣ What is the difference between 14Cr17Ni2 and 304 stainless steel?
14Cr17Ni2 is martensitic; 304 is austenitic.
14Cr17Ni2 can be hardened by heat treatment; 304 cannot.
14Cr17Ni2 has moderate corrosion resistance, 304 has higher corrosion resistance.
14Cr17Ni2 is ideal for shafts, blades, valves, while 304 is for pipes, tanks, and chemical equipment.
4️⃣ What are the mechanical properties of 14Cr17Ni2?
Tensile Strength: 700 – 950 MPa
Yield Strength: ≥ 450 MPa
Elongation: ≥ 12%
Hardness (HRC): 45 – 50 (after heat treatment)
5️⃣ What are the typical applications of 14Cr17Ni2 stainless steel?
Industrial shafts, axles, and gears
Valve components
Bearings and bushings
Knife blades and cutting tools
Automotive and machinery parts
Precision instruments and tooling
6️⃣ Can 14Cr17Ni2 be welded?
Yes, it is weldable, but preheating is recommended to avoid cracking. After welding, post-weld heat treatment can restore hardness and strength. Preferred methods: TIG, MIG, and arc welding.
7️⃣ How is 14Cr17Ni2 heat treated?
Quenching: 1000 – 1050°C, oil or water cooling
Tempering: 150 – 200°C for mechanical parts; higher temperatures for wear resistance
Achieves high hardness, strength, and moderate corrosion resistance
8️⃣ What environments is 14Cr17Ni2 suitable for?
Dry or mildly corrosive environments
Indoor machinery and industrial equipment
Avoid prolonged exposure to marine or highly acidic conditions
9️⃣ What forms of 14Cr17Ni2 are available?
Seamless and welded pipes/tubes
Plates and sheets
Round bars and forged components
Coils and strips
10️⃣ Why choose 14Cr17Ni2 over other martensitic stainless steels?
Balanced performance: good hardness, moderate corrosion resistance, and high strength
Heat treatable: can be customized for specific mechanical properties
Widely recognized international standards: X20Cr13 / SUS420J2 / 420C
For inquiries, technical support, or customized solutions regarding 14Cr17Ni2 (X20Cr13 / SUS420J2) stainless steel products, please feel free to contact our professional team. We provide fast response, global shipping, and tailored services to meet your industrial and engineering needs.
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