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3Cr17Ni7Mo2N Bar (ASTM A276/A479 Grade 318)
- Corrosion Resistance: High resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride environments.
- Strength: Enhanced mechanical properties due to nitrogen (N) and molybdenum (Mo) alloying.
- Weldability: Moderate weldability with pre/post-heat treatment to avoid carbide precipitation.
Chemical Composition (wt%)
Element | C | Si | Mn | P | S | Cr | Ni | Mo | N | Cu |
Range | ≤0.08 | ≤1.0 | ≤2.0 | ≤0.045 | ≤0.030 | 16.0-18.0 | 6.0-8.0 | 1.5-3.0 | 0.10-0.20 | ≤0.5 |
1. Performance Characteristics
Excellent Corrosion Resistance: Containing 17% chromium, 7% nickel, and 2% molybdenum, it is stable in both oxidizing and reducing media, and is particularly resistant to environments containing sulfur and chloride ions.
High Strength and Wear Resistance: Nitrogen strengthens the matrix, significantly improving hardness and wear resistance, making it suitable for high-load conditions.
High-Temperature Stability: The synergistic effect of molybdenum and nickel ensures that it maintains mechanical properties even at high temperatures, making it suitable for components in hot-processing equipment.
2. Core Advantages
Optimized Chemical Composition: The chromium-nickel-molybdenum-nitrogen combination offers a balanced combination of corrosion resistance, strength, and toughness, resulting in overall performance superior to that of ordinary stainless steel.
Processing Adaptability: Properties can be further adjusted through heat treatment to meet the customized needs of different industrial scenarios.
3. Main Applications
Petrochemical: Used in refining equipment, pipelines, and reactors, withstanding acidic media, high temperature, and high-pressure environments.
Energy: High-temperature components in nuclear and thermal power plants (such as turbine blades and pumps and valves) ensure long-term operational reliability.
Medical: Surgical instruments and implant materials that meet biocompatibility and corrosion resistance requirements.
Mechanical Manufacturing: Gears, shafts, and molds suitable for high-wear and high-stress operating conditions.
Surface Treatment
- Polishing: Ra ≤0.4 μm (mirror finish available)
- Pickling: Passivation per ASTM A967 for corrosion resistance
Why Choose Us ?
- Certification: ISO 9001, PED 2014/68/EU
- Customization: Precision machining and heat treatment services
Applications & Industries
Aerospace:
High-power density actuators.
Electronics:
Precision sensors & MEMS components.
Energy:
Magnetic coupling devices for turbines.
Frequently Asked Questions
Q1: Is this material weldable?
A: Yes, but use ER308L filler wire and post-weld annealing.
Q2: What is the maximum service temperature?
A: Up to 600°C in oxidizing environments.
Q3: How does nitrogen improve performance?
A:Nitrogen substitutes for carbon in the crystal lattice, increasing strength without sacrificing ductility. It also enhances localized corrosion resistance.
Q4: Can it replace 17-4PH steel?
Yes, but with trade-offs:
Pros: Better SCC resistance and lower cost.
Cons: Slightly lower hardness (HRC 35 vs. 17-4PH’s 40-45).
Q5: Certifications available?
Traceability: EN 10204 3.1/3.2, ISO 9001.
Special Cert: NACE MR0175 (for sour service).
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