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Stainless Steel Rod Stock | 17-4PH & 440C Variants

Stainless Steel Rod Stock | 17-4PH & 440C Variants

$1,190.00 SGD
$1,190.00 SGD
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Stainless Steel Rod Stock | 17-4PH & 440C Variants

Product Specifications

Our stainless steel rod stock offers premium-grade 17-4PH (precipitation-hardened) and 440C (high-carbon martensitic) alloys, engineered for extreme durability and precision across aerospace, marine, and industrial applications.

Property 17-4PH 440C
Material Standards ASTM A564, AMS 5643, UNS S17400 ASTM A276, UNS S44004
Hardness (Rockwell) H900: 40–44 HRC; H1150: 28–33 HRC Annealed: ≤269 HB; Hardened: 55–60 HRC
Diameter Range 1/4" (6.35mm) to 6" (150mm) 3/16" (4.76mm) to 4" (100mm)
Length Standard: 3m, 6m; Custom up to 12m Standard: 3m, 6m; Custom up to 12m
Surface Finish Cold Drawn, Polished, Precision Ground Annealed, Hot Rolled, Passivated
Tolerance ±0.03mm (laser-calibrated) ±0.05mm (precision-ground)
Temperature Range -200°C to 600°C (post-heat treatment) -50°C to 425°C (continuous use)

Key Properties & Manufacturing Process

Our stainless steel rods undergo advanced vacuum arc remelting (VAR) and controlled thermo-mechanical processing to eliminate impurities and optimize grain structure. Post-production treatments include:

  • 17-4PH: Solution annealing (1040°C for 2 hours) followed by aging (480–620°C for 2–4 hours) to achieve peak hardness and corrosion resistance.
  • 440C: Quenching (1010–1065°C) and tempering (150–370°C) to balance hardness and toughness.

Tensile & Bending Strength

  • 17-4PH:
    • Tensile Strength: 1,310 MPa (H900 condition), ideal for aerospace fasteners and turbine shafts.
    • Yield Strength: ≥1,180 MPa, resisting deformation in high-stress marine environments like stainless steel curtain rod installations.
  • 440C:
    • Tensile Strength: 2,000 MPa (hardened state), perfect for precision cutting tools and bearings.
    • Bending Strength: Maintains integrity under 1,900 MPa stress, suitable for stainless steel closet rod frameworks requiring rigidity.

Identification & Marking

Each rod is laser-etched for traceability and compliance:

  • 17-4PH: AISI/SAE 630, ISO 1.4542, and heat treatment codes (e.g., H900).
  • 440C: ASTM A276 markings with batch numbers aligned with EN 10088-3 standards.

Weight Calculation

Calculate the weight of a stainless steel rod using the formula:

Example: A 1/2" (12.7mm) diameter, 6m-long 17-4PH rod weighs 7.5 kg (density: 7.78 g/cm³).

 

Why Does Stainless Steel Rust?

While stainless steel is corrosion-resistant, specific conditions can compromise its integrity:

  1. Chloride Exposure: Saltwater or industrial chemicals degrade the chromium oxide layer. 17-4PH’s 15–17.5% Cr content offers superior resistance compared to 440C (16–18% Cr).
  2. Low Chromium Content: Grades with <10.5% Cr lose passivation. 440C’s high carbon (0.95–1.20%) increases hardness but reduces corrosion resistance in acidic environments.
  3. Galvanic Corrosion: Contact with carbon steel or aluminum accelerates oxidation. Use insulating sleeves for stainless steel brazing rods in mixed-metal assemblies.
  4. Thermal Stress: Prolonged exposure above 600°C causes scaling. 17-4PH retains strength up to 600°C post-heat treatment.
  5. Surface Contamination: Iron particles from tools induce pitting. Regular nitric acid passivation restores corrosion resistance.

Applications

  • Stainless Steel Brazing Rods: High-strength joints in HVAC systems and chemical tanks (ER630 compatibility).
  • Stainless Steel Closet Rod: Rust-free support structures for humid environments (440C’s hardened durability).
  • Stainless Steel Curtain Rod: Aesthetic, non-corrosive rods (17-4PH’s polished finish).
  • Aerospace Components: Landing gear, turbine blades, and fasteners requiring fatigue resistance.
  • Medical Tools: Scalpels and surgical instruments (440C’s edge retention).

Why Choose Our Stainless Steel Rods?

  1. Certified Quality: Compliant with ISO 9001, ASTM, and AMS standards for aerospace and marine use.
  2. Precision Engineering: ±0.03mm tolerance for critical applications like stainless steel brazing rods.
  3. Heat Treatment Expertise: Custom aging/annealing processes to optimize hardness and corrosion resistance.
  4. Global Logistics: 7–15-day lead time with air/sea freight options.
  5. Sustainability: 60% recycled content and eco-friendly production processes.

Why Us?

  • 20+ Years of Expertise: Specializing in ultra-high-strength alloys for extreme environments, validated by SGS/BV.
  • Third-Party Validation: Rigorous testing for hardness, tensile strength, and corrosion resistance.
  • End-to-End Support: 24/7 technical guidance on welding (e.g., stainless steel brazing rods selection) and ISO compliance.
  • Cost Efficiency: Competitive pricing without compromising aerospace-grade precision or durability.
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