We manufacture 302 stainless steel plates (UNS S30200) as the optimal solution where enhanced yield strength and retained ductility are critical. With a controlled carbon content (0.15% max), our 302 plates deliver ≥620 MPa tensile strength – 20% higher than 304 – while maintaining ≥40% elongation. This unique balance makes it ideal for cold-formed springs, fasteners, and stamped components subjected to cyclic stress. Unlike brittle high-carbon steels, 302 retains corrosion resistance comparable to 304 in mild environments while outperforming it in mechanical resilience.

Performance Advantages: The 302 Edge

1. Enhanced Mechanical Properties

   • Tensile Strength: 620–860 MPa (vs. 515 MPa for 304).

   • Yield Strength: 275 MPa min (34% higher than 304).

   • Work Hardening Rate: Rapid strain-hardening enables spring temper without heat treatment.

   • Fatigue Resistance: 240 MPa endurance limit (10⁷ cycles) for valve springs/clips.

2. Balanced Corrosion Resistance

   • Matches 304 in resistance to organic chemicals, food acids, and atmospheric exposure.

   • Avoid continuous >425°C service (carbide sensitization risk) or chloride-rich environments.

3. Forming & Fabrication Flexibility

   • Excellent deep-drawing (LDR=1.8) and roll-forming capabilities.

   • Cold-heading compatibility for ISO 898-1 Class 70 fasteners.

Product Parameters

Technical Specifications

Table 1: Chemical Composition (Weight %)

Conforms to ASTM A240, AMS 5517

Table 2: Mechanical Properties (Annealed Condition)

Global Price Positioning (2025 Q3)

Industry Applications

• Automotive: Seatbelt springs, exhaust hangers, clutch plates

• Medical: Surgical needle blanks, orthodontic archwires

• Electronics: Conductive springs, EMI shielding contacts

• Industrial: Conveyor belt scrapers, brush springs

• Food Service: Basket weave filters, conveyor guides

Processing Guidelines

Forming

• Cold Working:

  • Spring temper achieved at 30–50% reduction

  • Anneal between stages if reduction >80%

• Bending:

  • Minimum bend radius = 1.5× thickness (90° bends)

Welding (Limited Recommendation)

• Use AWS ER308L filler with Ar+2% O₂ shielding gas

• Post-weld anneal at 1010–1120°C for corrosion-critical applications

Heat Treatment

• Annealing: 1010–1120°C → rapid air/water quench

• Stress Relieving: 425°C for 30 mins (for spring components)

Why Luokaiwei’s 302 Plates?

1. Specialized Inventory:

   • Stocked in spring temper (1/4 hard to full hard)

   • Range: 0.1mm–25mm thickness × 1500mm width

2. Precision Processing:

   • ±0.05mm tolerance for medical stamping

   • Edge-conditioned coils for progressive dies

3. Certification:

   • ASTM A240/A666

   • RoHS 3.0 & REACH SVHC compliance

4. Value-Added Services:

   • Blanking with ±0.1mm tolerance

   • Pickling/Oil-free packaging for medical use

5 Critical FAQs

1. When to choose 302 over 304?
   When higher yield strength is needed for springs, clips, or formed parts without severe corrosion exposure.

2. Does work hardening affect corrosion resistance?
   No – cold working increases strength but retains corrosion properties in annealed areas.

3. Maximum service temperature?
   425°C continuous; 870°C intermittent (avoid 425–860°C due to σ-phase risk).

4. Can 302 be used in marine environments?
   Not recommended – switch to 316L if chlorides >50 ppm.

5. Do you provide certified material for FDA applications?
   Yes – our 302 plates meet 21 CFR 178.2010 for food contact surfaces.